Fishing district boundaries: Vodná plocha nádrže pri obci Buková. VN Buková is carp fishing district no. 2-4570-1-1. It lies in Trnava district (Trnava Region). According to the bed model, the surface at full level covers 36.4 ha and the greatest depth is 8.7 m. The fishing district is managed by MsO SRZ Trnava Game fish of the fishing district (3): The bite score for fishing district VN Buková is calculated for 9 game fish species from the weather right at the water, water temperature, light and air pressure. The forecast applies to the location 48.535° N, 17.363° E. The score, the best window of the day and what pushes it up or down Loading data… Hour by hour, pressure and the next few days Loading data… Where the sun and moon are right now and when the best windows of the day will come Drag along the axis to see where the sun and moon will be. The day lasts 9 h 16 min. Full moon around 24 Nov, new moon around 9 Dec. Solunar theory is not scientifically confirmed; we treat it as a supplement. The golden hour is the time around sunrise and sunset, when fish often bite. Fishing district VN Buková is classed as carp waters. Permits for fishing district VN Buková are issued by MsO SRZ Trnava Closed season, fishing hours, minimum sizes and daily limit. For guidance only: check them in the fishing regulations of the fishing district 15 Mar – 31 May fishing for all fish prohibitedoutside this period The ban does not apply 1 May – 31 May during fishing competitions (§ 13, para. 3). It also does not apply to carp waters that are watercourses (but not reservoirs, dead-end, dead and cut-off arms), or to other water bodies (§ 13, para. 5). Check in the fishing regulations of the fishing district which case your fishing district is. The protection periods by species (below) apply independently of this closed season. Applies only outside the closed season. Outside these hours fishing is prohibited (§ 14(b) of the Act). January to April, November, December6.00 – 21.00 h May4.00 – 24.00 h June to October0.00 – 24.00 h Months missing from the table fall within the closed season. The hours in November and December on trout and grayling waters relate to the exception for fishing huchen (§ 13, para. 4 of the Act); check in the fishing regulations what may be caught at that time. On border waters the hours in the permit or the fishing regulations apply (§ 11, para. 2 of the Decree). The Act regulates night fishing in two wordings that seem to contradict each other at first sight, so always ask about it in the fishing regulations of the fishing district or the fishing guard. This is a summary. For baits, hooks and groundbait also read the fishing regulations of the fishing district, because the user may tighten the conditions. The blue and green groups cannot be combined. The limit applies per day, also when fishing in several fishing districts, and once it is reached, fishing for that day ends. The species groups follow the SRZ interpretation of January 2026, not the text of the section directly. The fishing district user may set a lower limit in the permit, in which case the stricter one applies. During this period the species must not be caught, even if the water type otherwise allows fishing at that time. It applies independently of the closed season for all fish. Some species are protected all year round (for example zingel and streber, lampreys, gudgeons, spined loaches, maraena whitefish, Carpathian barbel, sichel) and fishing for them is always prohibited. The full list of species is in the guide The fishing law, rule by rule. The shortest length from which you may keep a fish. The fishing district user may raise the size, so look for the valid value in the permit and the fishing regulations. Total length is measured from the front of the head to the end of the longest ray of the tail fin (§ 12, para. 4). No minimum size applies, for example, to bleak, goldfish, European perch, roach, stone loach and invasive species. As of 6 Nov 2026: Act no. 216/2018 Coll. on Fisheries (wording effective 1 Jan 2022) and Decree no. 381/2018 Coll. (wording effective 1 Jan 2019); we found no newer wording. The law may change; you can find the current wording on Slov-Lex (Act) and Slov-Lex (Decree). The manager, the user and the organization that issues permits The center of fishing district VN Buková is at coordinates 48.53509, 17.36301. The fishing district is 902 m long. Course of the water, access, parking and spots marked by the organization The line shows the course of the fishing district according to the "Rybárske revíry" data 2026. Verify access points and exact boundaries on site. Where you can reach the water, where tributaries join and where there is danger Choose a fish species and the 3D model of the reservoir shows where it is most likely to be right now: by depth, bed, water temperature, light, season and time of day. The spots are an estimate from the environment, not the position of fish. Spots within 3 km of the watercourse are shown. Reservoir This is a reservoir, so the watercourse is not assessed here: the water has no current, fall or gradient. The chart shows the terrain height along the fishing district. The height comes from a relief model and is approximate (error of a few meters). Loading the 3D terrain model… According to the bed model, fishing district VN Buková has a greatest depth of 8.7 m and a mean depth of 5.6 m. At full level the surface covers 36.4 ha and the water volume is 2.05 million m³. Depths are based on maps made before flooding. Loading the 3D model of the bed… Height is measured from the full level. The thicknesses of the bedrock layers are illustrative; the map shows the surface only. How the area and volume of water change as the level drops. Bed by zones of erosion and sediment deposition, bedrock from the geological map. The bed is the original terrain under the reservoir according to spot heights on topographic maps from the time before flooding. Mud has settled on it since the reservoir was filled, so actual depths tend to be 1 to 2 m smaller. It is not suitable for navigation or diving. Very varied water How many different habitats the reservoir offers: drop-offs, shallows, depths, bed and old channels. A higher number means more places where fish hold, not more fish. The bed is modeled from spot heights from before flooding. What the bed and banks are made of: rock, sediments and their effect on the water Springs and groundwater outflows bring cooler water into the watercourse in summer and warmer in winter; fish stay near them in extreme weather. The fishing district description states the bottom: fine-grained, muddy. The map shows the bedrock geology, not the exact bottom at the spot. The actual bottom material may differ, especially where sediment has been deposited. We record 3 game fish species in fishing district VN Buková. Of these, 3 species are in the stocking plan. What is stocked into the fishing district and how much Suitability of the water for carp, trout and grayling species based on its properties The water is in the top 4% of 897 carp fishing districts with data. Reliability medium: we used 5 water data points; the rest are missing and are not part of the assessment. average depth 4.6 m, HydroLAKES A moderately deep, well-warmed reservoir is productive for cyprinids. Fish production in lakes rises with mineralization and falls with depth (Ryder 1965); at the same time trout and grayling need cool deeper layers in summer. The depth rating curves are our simplification based on species requirements and do not enter the score (reservoir depth is rated by a separate factor). Sources: Ryder 1965 ≈ 20.4 °dH (3.6 mmol/l of calcium and magnesium), ŠGÚDŠ atlas Harder water with enough calcium and magnesium is more productive, has a larger food supply and buffers acidity swings better. Water with calcium and magnesium is more productive and buffers acidity swings better: trout production was higher in calcareous hard waters (Almodóvar et al. 2006), and an index based on dissolved solids and depth predicts fish yield from lakes (Ryder et al. 1974). In Irish streams, however, geology did not change trout density (Lehane et al. 2004), and Downing et al. (1990) showed that production is related rather to primary production. Hence only ±1 point. Hardness comes from the ŠGÚDŠ atlas, not from a measurement in the fishing district; it replaces the separately assessed bedrock of the basin. Sources: Almodóvar et al. 2006; Lehane et al. 2004; Ryder et al. 1974 pH 7.9, ŠGÚDŠ atlas The pH is within the range in which fish commonly thrive. Below about pH 6 fish suffer, and trout and grayling are more sensitive than cyprinids (Alabaster and Lloyd 1982); in acidic soft water, aluminum is released from the soil and damages gills (Gensemer and Playle 1999). The pH from the atlas is a model estimate, so the reduction is only −1 or −2, and only where we have no pH measurement (which is assessed by a separate factor). Sources: Alabaster and Lloyd 1982; Gensemer and Playle 1999 ≈ 614 mg/l, ŠGÚDŠ atlas High mineralization: rich water, but already stressful for sensitive species. Dissolved solids (mineralization) are related to the fertility of the water, which is why Ryder used them to estimate fish production in lakes (Ryder 1965, Ryder et al. 1974). Downing et al. (1990) showed, however, that primary production is a better predictor of production. It does not enter the score, only the suitability index. Sources: Ryder 1965; Ryder et al. 1974; Downing et al. 1990 0 elements among the highest 10% in Slovakia (ŠGÚDŠ atlas 1999) None of the toxic elements in river sediment is among the highest values. In hard water metals are less toxic, because calcium competes for sites on the gills. The toxicity of metals to fish decreases with water hardness, because calcium competes with the metal for sites on the gills (Pagenkopf 1983). The ŠGÚDŠ atlas gives only the rank among streams, not a concentration comparable with a limit (MacDonald et al. 2000). In hard water we therefore rate metals more leniently, in soft water more strictly. Sources: Pagenkopf 1983; Gensemer and Playle 1999; MacDonald et al. 2000 The same water data evaluated against the requirements of trout, grayling and carp. The fishing district is registered as a carp fishing district; its type is highlighted. The index 0 to 100 compares the properties of the water with the requirements of the species (60 is the neutral value, 100 the ideal). The verbal rating comes from comparison with other fishing districts of the same type, because most Slovak waters have good values for their species. The index does not affect whether fish really occur in the fishing district (that is decided by stocking and the manager). Hardness, pH and mineralization from the atlases are historical and model estimates. Only a small part of this feeds into the conditions score and fishing district quality (hardness ±1, atlas acidity −2 to 0, stream zone match ±1 to quality). What fish eat in this water and how to choose a bait or fly Few insects November: 0.0× the average month 0.0× the average month, 0 of 50 observations in the year, iNaturalist. The observations are added by people from the surrounding area; they are not measurements at the water. They show when aquatic insects usually appear and are useful mainly for fly fishing. Surface area, water clarity, algal bloom and ice at fishing district VN Buková are tracked from Sentinel satellites. Water temperature is estimated from the weather at the water. Sentinel-2 (optical) and Sentinel-1 (radar), updated roughly every 6 days Clearer than usual (×0.6 compared with recent periods). Turbidity above 25 FNU is on 0% of the water surface. Since 25 Dec 2025: lowest 2 FNU (20 Mar 2026), highest 32 FNU (25 Dec 2025). An estimate based on the reflectance of the water in the red band. This is a relative aid, not a measurement in NTU. Sentinel-2, 5 Nov 2026, 100% of the area cloud-free Elevated chlorophyll shows on 22% of the water surface. Since 25 Dec 2025: lowest -0.46 (20 Mar 2026), highest 0.11 (11 Oct 2026). The NDCI index tracks chlorophyll-a in plant plankton (algae, cyanobacteria). It cannot determine the algae species or toxicity. Sentinel-2, 5 Nov 2026 The share of the area with green vegetation (plants on and just below the surface, reeds at the bank). Since 25 Dec 2025: lowest 0% (25 Dec 2025), highest 32% (11 Oct 2026). A strip of reeds at the banks may also be counted, so values on small areas may appear higher. Sentinel-2, 5 Nov 2026, 100% of the area cloud-free That is 87% of the usual maximum over the last year (32.4 ha). Since 25 Dec 2025: lowest 10.9 ha (11 Oct 2026), highest 33.2 ha (28 Feb 2026). Sentinel-1 radar (also sees through clouds and at night): 72% of the fishing district's shape is smooth water (4 Nov 2026), +4 pp over the month. The clear-water area excludes the pixels at the bank, so it is smaller than the area of the fishing district (36.1 ha according to the map). The change matters more than the number itself. In wind, radar may show the surface as rough. Sentinel-2, 5 Nov 2026, 100% of the area cloud-free The share of the area where the satellite sees ice or snow. Over the last 20 days the highest was 0%. The satellite cannot determine the thickness or load-bearing capacity of the ice. Never go onto the ice based on this figure. Sentinel-2, 5 Nov 2026, 100% of the area cloud-free Fish activity rises with the temperature. Fish hold in deeper, slower places. An experimental estimate from the thermal band of Landsat (pixel 100 m, no atmospheric correction); the error can be 2 to 3 °C. This is the surface temperature, not the temperature at depth. Landsat 8/9, 18 Oct 2026 Fish can see well and are shy. A finer rig, natural colors, longer casts, fishing mainly in the morning and evening. The water has a smaller area than usual: fish retreat to deeper places, shallows and banks are exposed, and new obstacles may appear. Enter the water carefully. Fish activity rises with the temperature. Fish hold in deeper, slower places. The analysis is based on common angling rules and satellite data. It is an aid, not a bite forecast. The fishing regulations, the permit and the situation on site decide. Data have been stored since 16 Oct 2025 (51 periods of 5 days); the charts show how they develop. Download history (CSV) Estimates from satellite images with a resolution of 10 to 20 m, not a measurement in the water. They are affected by clouds, shadows, wind and banks. Do not use them to decide about swimming or going onto the ice. Data: Contains modified Copernicus Sentinel data 2026, ESA, Copernicus Data Space Ecosystem; the latest water indicators are computed from the same Sentinel-2 images in the open data on AWS (Registry of Open Data, resolution 20 m). The procedure is described in the Methodology. The water quality index of fishing district VN Buková is 81 out of 100. It is based on 3 groups of data from measurements and registers in the area. Clean water Five pillars from measurements and registers. A pillar without data is not counted in the index, so check the data reliability too. Oxygen has a weight of 30%, water pollution 25%, nutrients and bloom 20%, sources nearby 15%, acidity and hardness 10%. Detailed measurements are in the cards below. Summary: water and oxygen, pollution and life at the water, and how much they shift the conditions score We assessed 17 factors; 3 of them change the score. The adjustments range from −14 to +12 points so that they do not outweigh the weather and water temperature. They are counted in the score, in the ranking and in the filters. ≈ 20.4 °dH, ŠGÚDŠ atlas Harder water is more productive, has more food and buffers acidity swings better. Water with calcium and magnesium is more productive and buffers acidity swings better: trout production was higher in calcareous hard waters (Almodóvar et al. 2006), and an index based on dissolved solids and depth predicts fish yield from lakes (Ryder et al. 1974). In Irish streams, however, geology did not change trout density (Lehane et al. 2004), and Downing et al. (1990) showed that production is related rather to primary production. Hence only ±1 point. Hardness comes from the ŠGÚDŠ atlas, not from a measurement in the fishing district; it replaces the separately assessed bedrock of the basin. Sources: Almodóvar et al. 2006; Lehane et al. 2004; Ryder et al. 1974 metals and metalloids (above the standard at 1 of 5 stations), highest value 1 times the standard Metals, pesticides, PFAS and chlorinated solvents above the standard show the burden on the surroundings. The standards are set for drinking water and are stricter than the limits harmful to fish, so the reduction is small; metals can also come from rocks. PAHs are not counted in the score. Data reliability is 85% (5 stations within 10 km, the nearest 5.5 km, data from 2025); the adjustment was applied in full. Metals and metalloids, pesticides, PFAS and chlorinated solvents above the standard at stations within 10 km. The standards are drinking-water standards and stricter than the limits harmful to fish, so the reduction is small: one point for one or two groups of substances, two points for three groups or for a value at least five times above the standard. Metals are poisonous to fish, more so in soft water (Pagenkopf 1983), and PFAS accumulate in tissues (Giesy and Kannan 2001); metals can also come from rocks. PAHs are not counted. The adjustment is multiplied by the reliability of the data. Sources: SHMÚ, groundwater; Pagenkopf 1983; Giesy and Kannan 2001 0.0× the average month, 0 of 50 observations in the year, iNaturalist Aquatic insects are scarce this month; food near the bottom matters more. Anglers fish "by the insects" (dry and wet fly). A measured relationship between catches and insect hatches is not documented in our sources. Data for these factors is missing or within the normal range: The rules are indicative and based on fishing practice and scientific studies; for each factor you can see how well it is supported. Weather, air pressure and water temperature affect the score more than this data does. pH and hardness, trace elements in water and sediment, landfills and contaminated sites, boreholes with analyses (ŠGÚDŠ) pH 7.9modeled estimate water type Ca–Mg–HCO₃ Mineralization 614 mg/l, hard water (20.4 °dH). Interpolation of measurements from the Geochemical Atlas of Slovakia, not a measurement in the stream. 0 from 15elements in the top 10% highest: Cadmium 0.403 mg/kg Position of the highest-ranked element among the sample points on streams in Slovakia: percentile 80. Interpolation of the Geochemical Atlas of river sediments. 13boreholes within 3 km 156 water analyses nearby Of these, 13 have an archive report from Geofond. The boreholes are hydrogeological, geological, engineering-geological and other. 4sites within 3 km 4 landfills No environmental burden is registered within 3 km; landfills are only recorded. The chemistry of water and sediments is a model estimate from interpolated maps of the Geochemical Atlas of Slovakia, not current monitoring or a measurement in the stream. The proximity of a contaminated site or landfill does not mean that substances from it leak into the water. The locations of the objects are on the map in the Geology and geophysics section. Stations nearby and measured values Exceeded in 2025: Exceeded in 2025: In the yearbooks 2017 to 2025 no exceedance of the standard is recorded at the station. In the yearbooks 2017 to 2025 no exceedance of the standard is recorded at the station. In the yearbooks 2017 to 2025 no exceedance of the standard is recorded at the station. Groundwater reaches streams as base flow, so the connection to the stream at the fishing district is only indirect. Natural substances (iron, manganese, sulfates, conductivity) are not counted in the yearbook-based assessment. The data comes from the SHMÚ yearbooks (groundwater 2017 to 2025). A typical value from 5 groundwater stations within 10 km of the fishing district (nearest 5.5 km), measured in 2025. Closer stations carry more weight. This is groundwater near the fishing district, not a measurement in the watercourse itself. The standard is the limit that SHMÚ gives for the indicator (for drinking water); a value equal to the standard counts as an exceedance, as it does at SHMÚ. The label "somewhere above the standard" means that the typical value is below the standard but at least one station exceeds it; which one is shown on the tile. Fish are more sensitive to some substances than people are. 0.005mg/l far below the standard Standard 0.5 mg/l. Range 0.005 to 0.04 mg/l, 5 stations. 0.005mg/l far below the standard Standard 0.5 mg/l. Range 0.005 to 0.06 mg/l, 5 stations. 10.1mg/l below the standard Standard 50 mg/l. Range 6.4 to 27.2 mg/l, 5 stations. 5.33mg/l less oxygen Mark on the dial: 9 mg/l, the guideline for salmonid waters. Range 2.76 to 10.3 mg/l, 5 stations. 10.4°C moderate Range 8.7 to 16.7 °C, 5 stations. 7.34 suitable for fish Range 7.13 to 7.61, 5 stations. 3.64mmol/l hard Range 0.86 to 4.74 mmol/l, 5 stations. 0.002mg/l far below the standard Standard 0.2 mg/l. Range 0.001 to 0.024 mg/l, 5 stations. 0.001mg/l far below the standard Standard 0.05 mg/l. Range 0.001 to 0.022 mg/l, 5 stations. 2.2mg/l far below the standard Standard 250 mg/l. Range 1.9 to 16.7 mg/l, 5 stations. 38.1mg/l far below the standard Standard 250 mg/l. Range 15.8 to 87.5 mg/l, 5 stations. 63.2mS/m close to the standard Standard 125 mS/m. Range 17.3 to 82.9 mS/m, 5 stations. 65% of standard close to the standard Highest: Aluminum 0.2 mg/l (100% of the standard, 5.5 km from the fishing district). 5 stations. Above the standard: 1 of 5. 0% of standard not detected Below the limit of quantification: substances from this group were not detected in the samples. 1 station. 0% of standard not detected Below the limit of quantification: substances from this group were not detected in the samples. 1 station. Sources Fishing district VN Buková has the number 2-4570-1-1. The reliability of data about the fishing district is 68 out of 100. Where the fishing district lies, what type of water it is, what its river basin is and what the organization writes about it Typical of gravel pits and reservoirs. In summer, fish often stay above the thermocline or at its level; below it there is little oxygen. Slow lowland waters and carp fishing districts. Mud hides food, but in summer there may be less oxygen near the bottom, and lures sink into it. Even bank without coves. Fish concentrate at rare obstacles: logs, rocks, inflows. In summer the water warms up quickly and aquatic plants and algae thrive here. At midday fish move to deeper places. Grows by the water; the roots stabilize the bank and create shelters beneath the surface. The branches hang over the water and provide shade and insects. A typical tree of stream and river banks. A dense root system creates undercut banks and shelters, and the leaves decompose quickly. The explanation is general and based on the fishing district description in the data and on common fishing practice. Actual conditions on site may differ; check them before you fish. Natural lake The data come from a global database with a coarser resolution (tens of meters), so they are only approximate for small waters. Depth and volume are model averages. Changes in the surroundings and nature from 2017 to 2023: how the banks, vegetation and landscape around the water change. The images switch automatically; you can also browse them by hand. Orthophoto mosaic of Slovakia © GKÚ Bratislava, NLC Zvolen. The year and day of imaging depend on the location, so individual years may differ in season and weather. Measurements and estimates What is measured right at the water for this fishing district, what is only partly supported, what is a model estimate and what is missing. The higher the number, the more you can rely on the indexes on this page. Rocks, faults, radon and geophysical measurements around fishing district VN Buková. Bedrock, watercourse and springs on the map, values at the location of the water, geomagnetic activity and earthquakes. This is information about the environment; only small hypotheses marked with a confidence level (faults and rocks, geomagnetic storm) enter the score. The bedrock map needs JavaScript to be turned on. Geological map of Slovakia 1 : 50,000: rocks beneath the surface, from alluvial gravels and sands through clays to granites and limestones. Colors follow the ŠGÚDŠ legend; clicking the map shows a description of the rock at that spot. For anglers: Gravel bars and rocky riffles give a clean bottom and habitat for zander, perch and barbel. Clayey and muddy ground holds food for carp and bream. Limestone and dolomite give harder water that is richer in food than granite and quartzite. Radon risk of the bedrock (low, medium, high). It is based on the radioactivity of rocks and on fissures. The map shows the bedrock, not radon in water. For anglers: Radon is a natural tracer of groundwater. Bedrock with a higher radon risk (granite, gneiss, tectonic faults) tends to be where fissure water comes to the surface. Most of Slovakia is "medium", so mainly a high risk is of interest. Equivalent uranium in surface rocks from airborne gamma spectrometry (ppm). From 4 ppm the bedrock is usually classified as having an elevated radon risk. For anglers: A high uranium level is a sign of granite, gneiss and black shales, that is, rocks from which radon and dissolved substances get into the water. It has no direct meaning for bites, but it helps to read the geology of the area. Gamma radiation dose rate in air (nGy/h) from an airborne survey. It is the natural background of the bedrock, not pollution. For anglers: Higher values are found in rocks rich in uranium, thorium and potassium (granite, gneiss, flysch with shales). It complements the uranium map; for an angler it mainly shows where the bedrock changes. Anomalies of the Earth's magnetic field (ΔT, in nT) caused by rocks with magnetic minerals, such as volcanic rocks, basalts or amphibolites. For anglers: Fish (especially salmonids and eels) sense the magnetic field. Whether local anomalies affect their movement and bites has not been shown; it is treated as a hypothesis. Click or tap the map to find the value at that location. medium Common for most of Slovakia. 2.6ppm common Typical background of the rocks. 7.3ppm below the crustal average Natural background of the rocks. 1.30% below the crustal average Natural background of the rocks. 50nGy/h around the world average Natural background of the bedrock. 16nT above the average of the surroundings Deviation of the magnetic field from the average of the surroundings. The values apply to a single spot (marked with a dot on the map), not as an average of the whole watercourse or river basin. Radon is a natural tracer in groundwater; the map does not include radon in water, only the bedrock risk. Mark on the dial: the average of the upper continental crust (uranium 2.7 ppm, thorium 10.5 ppm, potassium 2.3%; Rudnick and Gao 2003) and the world average of the natural outdoor dose 59 nGy/h (UNSCEAR 2000). The needle does not swing towards “good” or “bad”; it only shows where the value lies. Elevated uranium or radon is only information about the rock. It has no proven significance for bites; it helps to read what bedrock the water comes from. up to 1 km fault nearby Tectonic fault on the geological map. 2 groundwater by the watercourse Within 1 km. covered by younger sediments observed at the surface Fissure groundwater flows out of the bedrock along faults and at springs. It tends to be cooler in summer and warmer in winter than the water in the stream, so according to anglers' experience fish stay near such places in extreme weather (summer and winter islands of a more suitable temperature). However, fresh fissure water can have little oxygen. This is anglers' experience, not a phenomenon measured at this fishing district. Faults are from the geological map at 1 : 50,000. Springs come from a hydrogeological map that covers only some regions, so zero does not mean there are no springs there. The line is the water of the fishing district, the light band is the 3 km zone in which boreholes, mine workings and burdens were searched for. The map shows the nearest objects (at most a few dozen from each register), not all of them. The points correspond to the position in the register; area objects are marked by their center. River alluvium100% of the water line Gravelly and sandy bottom and floodplains; the water is replenished from groundwater in the alluvium. Geological Map of Slovakia 1:50,000. 35°C at 1,000 m depth At a depth of 2,000 m about 65 °C (increase of 30 °C per kilometer). Atlas of Geothermal Energy of Slovakia. 0samples with gold 10 ore minerals in the sediment No gold was found in river sediment samples within 1 km of the water. The samples do not cover every stream, so this does not mean there is no gold here. – 4 geothermal and mineral water springs within 10 km. 14records within 5 km 6 deposits, 8 ore occurrences Geofond registers, the metallogenetic map and the mineral resources map. The data come from registers, maps and atlases of the State Geological Institute of Dionýz Štúr and describe the environment around the water. Proximity of a mine working or burden does not mean the water is polluted. The chemistry of water and sediments is a modeled estimate from interpolated maps of the Geochemical Atlas of Slovakia, not current monitoring or a measurement in the stream. Detailed geology and geochemistry of the whole stream: rock under the water, water composition, elements in sediments, radiation, geothermal potential, metals, gold in sediment, mine workings, boreholes with analyses. Highest forecast Kp in the next 24 hours: 1.7 (quiet field). Kp (0 to 9) measures the fluctuation of the Earth's magnetic field caused by the solar wind. From 5 it counts as a geomagnetic storm. Fish, especially salmonids and eels, sense the magnetic field. That their bites depend on Kp has not been shown, though: these are anglers' observations and hypotheses. The value is the same for the whole of Slovakia. It enters the activity score only during a strong geomagnetic storm (a hypothesis, −1 to −2 points). According to angling lore, fish (especially catfish and eels) react restlessly to tremors beforehand or stop biting. This is not reliably proven, and with weak tremors it is coincidence. People mostly do not notice deeper tremors from the Carpathians (for example near Komárno and Dobrá Voda) at all. The GEOFON catalog is global; weak tremors near Slovakia may not all be in it. It is not counted in the activity score. Data: © ŠGÚDŠ (geological, geophysical and hydrogeological maps), NOAA SWPC (Kp index), GFZ GEOFON (earthquakes). A link between the geomagnetic field, tremors or radon and fish bites has not been reliably proven, so they are not counted in the activity score. The method is described in Methodology. Wildlife, birds and plants observed around fishing district VN Buková. Species that have been observed or recorded around the water. Wildlife, plants and hazards do not enter the fishing conditions score and are for information only. The name of a species leads to its page. The most common duck; it nests by almost every water with bankside vegetation. It stands in the shallows and lies in wait for small fish. It is easy to see along the banks of ponds and slow streams. A large white waterbird that nests by slow waters, reservoirs and ponds with vegetation. The most common gull by the water. Nests in colonies at ponds and large reservoirs and also stays along rivers. Predatory insect. The larvae live underwater for several months to years; adult dragonflies hunt in the air above the water. Insects whose larvae, in many species, build protective cases from pebbles, sand or plants. A harmless snake with two yellow spots on the nape. It swims well and hunts frogs, fish and newts. The largest native toad. In spring it migrates to water, where it breeds. A herbivore that changes the stream and its banks with dams and burrows. It is protected. It creates shallows and pools where fish and insects thrive. A group of green frogs that sit by the bank and jump into the water when disturbed. The only native turtle in Slovakia. It lives in standing and slow waters with a soft bottom. A rodent from North America that swims well and feeds on bankside plants. It digs burrows into the banks. A riparian tree whose roots reach below the water surface. Tall grass that forms extensive reed beds around ponds and on banks. A tall wetland plant with yellow flowers that grows on damp banks. A tiny floating plant that can cover the whole surface of standing water. An invasive plant from the Himalayas, up to two meters tall, with pink flowers. It overgrows the banks of watercourses. An invasive herb from East Asia that forms dense stands up to three meters tall. Transmits tick-borne encephalitis and Lyme disease. It waits in tall grass and in the vegetation along banks. How to protect yourself: From spring to autumn check yourself after fishing, use repellent and tuck long trousers into your socks. Remove a tick as soon as possible with tweezers. A vaccination against encephalitis exists. An invasive plant that grows along stream banks and on wet meadows. In sunlight its sap causes skin burns. How to protect yourself: Do not touch it and do not walk through the vegetation. If the sap gets on your skin, wash it off with water and soap and protect the area from the sun. See a doctor for larger burns. Large biting flies. They are most active on hot, windless days near water and on meadows. How to protect yourself: They sting painfully, especially in summer around midday. Light-colored clothing with long sleeves and repellent help. It comes to the water to wallow and drink, mainly at dusk and at night. How to protect yourself: A wild boar sow with piglets can be aggressive. Keep your distance, do not spend the night on a game trail and do not leave food scraps near the water. They breed in standing water, so they are worst around reservoirs, oxbow lakes and floodplain forests, especially at sunset. How to protect yourself: When fishing in the evening and at night wear long sleeves, repellent and a net. Warmth and humidity after rain speed up mosquito development. Wildlife, plants and hazards: records come from observations and also reflect where observers move around; they are not density measurements or a guarantee of an encounter. They apply to the surroundings of about 35 × 55 km. Nearest fishing districts around VN Buková: 6. Nearest fishing districts in the same river basin
Fishing district VN Buková at a glance
By the water today
Is it worth going today? Conditions score, which species are biting today, the best window of the day, weather, pressure, sun, moon and solunar windowsNajlepšie oknoVoda–By the water now
Fishing conditionsFish activity indexOur calculation (0–100): the base is set by water temperature, adjusted by light, turbidity, oxygen, weather and other factors according to how well they are supported by studies. For each factor you can see the confidence and the source. A planning aid, not a bite forecast.
Fishing conditions
Fish activity indexOur calculation (0–100): the base is set by water temperature, adjusted by light, turbidity, oxygen, weather and other factors according to how well they are supported by studies. For each factor you can see the confidence and the source. A planning aid, not a bite forecast.Weather and forecast for fishing district VN Buková
Weather and forecast
Sky: sun, moon and solunar windowsSolunar periodsCalculated from the position of the Moon: major periods (about 2 h) around the Moon's passage above and below the horizon, minor periods (about 1 h) around moonrise and moonset. A scientifically unconfirmed theory: in a study of 361 fishing trips (Quigley et al. 2023) it did not predict bites. We treat it as a hypothesis with a weight of at most ±2 points.
Sky: sun and moon
Solunar periodsCalculated from the position of the Moon: major periods (about 2 h) around the Moon's passage above and below the horizon, minor periods (about 1 h) around moonrise and moonset. A scientifically unconfirmed theory: in a study of 361 fishing trips (Quigley et al. 2023) it did not predict bites. We treat it as a hypothesis with a weight of at most ±2 points.Sun
MonthMoon phaseAt full and new moon the gravitational effect is strongest. On a clear full-moon night predators and carp often feed at night, and the day after may be weaker.
Windows of the daySolunar periodsCalculated from the position of the Moon: major periods (about 2 h) around the Moon's passage above and below the horizon, minor periods (about 1 h) around moonrise and moonset. A scientifically unconfirmed theory: in a study of 361 fishing trips (Quigley et al. 2023) it did not predict bites. We treat it as a hypothesis with a weight of at most ±2 points.
Rules and permits
Am I allowed to fish here? Closed seasons, fishing hours, size limits, daily limit, permit price, where to buy it, contacts and the managerWater typeCarpOrganizationMsO SRZ TrnavaLaw and fishing rules at fishing district VN Buková
Closed season for all fish
§ 13, paragraphs 3 and 5 of the ActDaily fishing hours
§ 11 of the DecreeRods, baits and fishing days
§ 18 of the ActHow many fish you may keep per day
§ 14 of the DecreeProtection periods by species§ 10 of the Decree
Minimum sizes§ 12 of the Decree
Show as a list
Before and after fishing
Who manages fishing district VN Buková
Who manages the fishing district
Where to fish
Fishing district map, access and parking, spots by the water, tributary mouths, hazardous places and surrounding terrainLength902 mDistrictTrnavaMap of fishing district VN Buková
48.53509, 17.36301
OpenStreetMap
Spots by the water, tributary mouths and gradient
Fishing spot finder
Confluences and risk spots
Elevation profile: reservoir
Elevation profileHow the altitude of the watercourse changes downstream. It is calculated from a digital relief model (tens of meters), not from a water-level measurement, so it is approximate, especially for narrow streams.Terrain in 3D
Reservoir bed in 3D
Depth map and 3D bed model, fishing spot finder by fish species, reservoir cross-section, volume and area at different water levels, bed composition and bedrockMaximum depth8.7 mAverage depth5.6 m83Reservoir bed
Map from before floodingCross-section of the reservoir
Hypsographic curve
Bed and bedrock
Fishing spots index
Bed and bedrock according to maps
Bed and bedrock
Bottom and bedrock (ŠGÚDŠ)The bedrock under the water according to the hydrogeological map of Slovakia at 1 : 50,000 (ŠGÚDŠ). It tells whether the surroundings are gravelly, sandy, clayey, muddy or rocky.Fish and catches
Which fish live here, what has been caught here, what is stocked, which species the water suits and what the fish eatDocumented species3Dnes najlepšieCatches from fishing district VN Buková
Catches from the fishing district
Stocking of fishing district VN Buková
Fish stocking
Which fish this water suits
Water suitability for the fishing district type
Water suitability for the fishing district typeIndex 0 to 100: how well the properties of the water match the needs of trout, grayling or carp, depending on the fishing district type. It is not a bite forecast or a statement about which fish live there.What we know about it
What we know about it
What we know about it
What we know about it
What we know about it
How this water would suit each type
Fish food: aquatic insects
Aquatic insects
Aquatic insect swarming (iNaturalist)How many observations of mayflies, caddisflies and stoneflies people nearby recorded this month compared with the annual average. For fly anglers it hints at insect hatches.
Mayflies0Mayflies: dry fly on the surface, especially at dusk.
Caddisflies0Caddisflies: in the evening and at night by the bank; a nymph and a wet fly also work.
Stoneflies0Stoneflies: clean, cold streams, often already at the end of winter and in early spring.Photo credits
Water now
Water level and flow, water temperature, ice on the surface, surface area, clarity, bloom and weed growth from satelliteTeplota vodyWater level87% of usualClarityClear waterFrom space: what the Copernicus satellites show
Water clarity from the satellite
Water clarity from the satelliteAn estimate of turbidity from the reflection of light off the water surface in the red band of the Sentinel-2 satellite. Clear water reflects little, turbid water a lot. It is a relative aid, not a measurement.Blooms and chlorophyll
Blooms and chlorophyllThe NDCI index compares the reflectance in the red edge (705 nm) and in the red band (665 nm). Higher values mean more chlorophyll-a, i.e. more algae and cyanobacteria in the water.Surface overgrowth
Surface overgrowthThe share of the fishing district's area where the satellite sees green vegetation (NDVI index above 0.3): floating and emergent plants and reeds at the bank.Water surface area: optical and radar
Water surface area: optical and radarThe area of clear water from an optical image (Sentinel-2) and the share of smooth water from radar (Sentinel-1), which also sees through clouds. The change from the usual state matters more than the number itself.Ice on the surface
Ice on the surfaceThe share of the area where the satellite sees ice or snow. It cannot determine the thickness or load-bearing capacity of the ice.Surface temperature from the satellite
Surface temperature from the satelliteAn experimental estimate from the thermal band of the Landsat 8/9 satellite (pixel 100 m). The error can be 2 to 3 °C and it concerns only the surface.What this means for fishing
What this means for fishingA short analysis based on satellite data and common angling rules. It is an aid, not a bite forecast.Water quality and cleanliness
Oxygen, pH and hardness, nutrients, pollution, wastewater treatment plants, landfills and contaminated sites nearby, groundwaterQuality indexClean water81Water quality index
What water quality means for fish and fishing
What follows from this
Public sources in the conditions scoreData on oxygen, nutrients, reservoir depth, watercourse size, bottom, fish species and insect swarming slightly adjust the "Fishing conditions" score. Each adjustment is shown separately in the score breakdown.Water and oxygen+1
What we know about it
Pollution−1
What we know about it
Life by the water0
What we know about it
Do not change the score
Water chemistry, sediments and contaminated sites nearby
Water according to the atlas
Elements in river sediment
Boreholes and groundwater analyses
Environmental burdens and landfills
Groundwater
Groundwater nearby
Groundwater nearby (SHMÚ)Measured groundwater values from stations within 10 km of the fishing district (nitrates, harmful substances, ammonium, iron, chlorides) and the SHMÚ yearbooks.Groundwater within 10 km (5 stations)
Measured values, year 2025, sampling 4 Jun 2025
Measured values, year 2025, sampling 5 Nov 2025 (2 samplings, the highest value of the year for each substance)
Measured values, year 2025, sampling 10 Jun 2025
Show 2 more
Measured values, year 2025, sampling 23 Jul 2025
Measured values, year 2025, sampling 10 Jun 2025
Groundwater: measured values
Groundwater nearby (SHMÚ)Measured groundwater values from stations within 10 km of the fishing district (nitrates, harmful substances, ammonium, iron, chlorides) and the SHMÚ yearbooks.Ammonium
Nitrites
Nitrates
Oxygen
Water temperature
pH
Water hardness
Iron
Manganese
Chlorides
Sulfates
Conductivity
Metals and metalloids
Pesticides
PAHs (combustion, petroleum substances)
How it affects fish and the water
About the fishing district and the reservoir
Location and area, character of the water, river basin and reservoir, the organization's description and historical satellite imagesRegionTrnava Region68Location, character and river basin of fishing district VN Buková
Location, area and nature protection
Characteristics
What this means for anglersexplanation of the bottom, vegetation, watercourse line and other data of this fishing district
River basin and reservoir
Reservoir depth (HydroLAKES)Average depth, volume and water retention time in the reservoir from the HydroLAKES database (WWF). The depth is estimated by a model from the surrounding terrain, so it is approximate.Historical images
Data reliability
Geology and geophysics
Rocks under the water, faults and springs, radon and natural radiation, magnetic field, earthquakes, geothermal energy, mines and deposits, landslidesGround under the water: geology, faults and radon
low 36.7%
medium 63.0%
high 0.3%
no data
0 – 1
1 – 2
2 – 3
3 – 4
4 – 5
5 – 7
7 – 35no data0 – 2020 – 40
40 – 6060 – 8080 – 100100 – 140
140 – 180
180 – 220
220 – 999
-1 217 – -1 000
-1 000 – -250
-250 – -200
-200 – -190
-190 – -180
-180 – -170
-170 – -160
-160 – -150
-150 – -140
-140 – -130
-130 – -120
-120 – -110
-110 – -100
-100 – -90
-90 – -80
-80 – -60
-60 – -40
-40 – -20
-20 – 0
0 – 10
10 – 20
20 – 30
30 – 40
40 – 50
50 – 70
70 – 100
100 – 150
150 – 200
200 – 250
250 – 300
300 – 400
400 – 500
500 – 600
600 – 700
700 – 800
800 – 900
900 – 1 000
1000 – 1 100
1100 – 1 130Values at the water spot
Values at the water spotBedrock radon risk, uranium, thorium, potassium, gamma radiation and magnetic anomaly at a single spot by the water (marked with a dot on the map).Radon risk of the bedrock
Uranium (eU)
Thorium (eTh)
Potassium (K)
Gamma radiation
Magnetic anomaly (ΔT)
Faults and springs
Faults and springsThe distance to the nearest tectonic fault on the geological map and the number of springs nearby. Fissure groundwater flows out along faults.Nearest fault
Springs and outflows
Geology nearby: rock, water, sediments, boreholes
Geology and geochemistry around the waterRock under the water, composition of water and sediments according to the atlases, radioactivity, geothermal potential, boreholes, old mine workings, deposits, burdens, landslides and gold in sediments, from ŠGÚDŠ maps and registers.Rock under the water
Heat underfoot
Gold in river sediment
Geothermal energy
Deposits and ore occurrences
Geomagnetic activity
Geomagnetic activity (Kp)The planetary Kp index (0 to 9) measures the fluctuation of the Earth's magnetic field. From 5 it counts as a geomagnetic storm. The last 48 hours and a forecast for 24 hours are shown.Earthquakes nearby
Earthquakes nearbyTremors recorded within 150 km of the water in the last 30 days (GFZ GEOFON catalog).Nature and hazards at the water
Wildlife, birds and plants around the water, dangerous and invasive species, what to watch out forWildlife, plants and hazards around the waterWildlife and hazards by the water (GBIF)Game animals, birds, plants and hazards (bear, ticks, mosquitoes, giant hogweed) that people have recorded around the water. It is not part of the fishing conditions score and is for information only.
BirdMallard
Most records: April.
About the species
BirdGrey heron
Most records: April.
About the species
BirdMute swan
Most records: April.
About the species
BirdBlack-headed gull
Most records: May.
About the species
WildlifeDragonflies
Most records: Jul.
About the species
WildlifeCaddisflies
Most records: May.
About the species
WildlifeGrass snake
Most records: May.
About the species
WildlifeCommon toad
Most records: April.
About the species
WildlifeEurasian beaver
Most records: October.
About the species
WildlifeGreen frogs (water frogs)
Most records: August.
About the species
WildlifeEuropean pond turtle
Most records: May.
About the species
WildlifeMuskrat
Most records: March.
About the species
PlantBlack alder
Most records: Jun.
About the species
PlantCommon reed
Most records: Jun.
About the species
PlantYellow flag iris
Most records: May.
About the species
PlantCommon duckweed
Most records: September.
About the species
Invasive plantHimalayan balsam
Most records: September.
About the species
Invasive plantJapanese knotweed
Most records: October.
About the species
RiskCastor bean tick
Most records: April.
How to protect yourself
RiskGiant hogweed
Most records: Jun.
How to protect yourself
RiskHorseflies
Most records: Jul.
How to protect yourself
RiskWild boar
Most records: April.
How to protect yourself
RiskMosquitoes
Most records: April.
How to protect yourself
Photo credits
Other fishing districts nearby
Fishing districts on the same watercourse and the nearest fishing districts in the river basinFishing districts6Other fishing districts around VN Buková
2-2280-1-1CarpRašelinisko Plavecký Peter IV.
Bratislava Region
2-2270-1-1CarpRašelinisko Plavecký Peter III.
Bratislava Region
2-2290-1-1CarpRašelinisko Plavecký Peter Rybník I.
Bratislava Region
2-2070-4-1Salmonid (trout)Parná č. 3
Trnava, Trnava Region
2-1380-1-1CarpMyjava č. 2a
Myjava, Trenčín Region
2-0690-1-1CarpHlbocké rameno
Senica, Trnava Region
Conditions scoreBest window
AirPressure
Sunrise6:56Sunset16:12
Waxing crescent26% illuminated
Water typeKaprový
BukováWeirs, dams and obstacles · dam
0.1 kmSources
Nobody has recorded a catch in this fishing district yetBe the first: after approval it will also appear here in the ranking.
Species in the plan3
The most suitable water for carp and cyprinids
Reservoir depthLevel of evidence: Angling practice
Water hardnessLevel of evidence: Hypothesis
Water acidity (pH)Level of evidence: Partially supported
MineralizationLevel of evidence: Hypothesis
Metals in sedimentLevel of evidence: Partially supported
Image date
28 Jul 20265 Nov 2026
dry groundwaterNDWI index
bare grounddense vegetationNDVI index
clearturbid0 to 90 FNU
littlea lot of chlorophyllNDCI index
sparsedense vegetationNDVI index
≈ 3.6 FNUClear water
NDCI 0.00Moderate chlorophyll
15 % of areaPartly overgrown
28.2 ha of clear waterSlightly lowered water level
0 % of areaNo ice
12.6 °CCool water
Clear water
Lower water level
Surface temperature 13 °C (estimate)
Public data about this water hardly change the activity score.
Water hardnessLevel of evidence: Hypothesis
+1
Harmful substances in groundwater (SHMÚ)Level of evidence: Partially supported
−1
Aquatic insect hatchesLevel of evidence: Angling practice
0
Plavecky Peter – Mlaka 3+4Malacky district · spring · 5.5 km from the fishing district
natural substances only2017 to 2025
Plavecky MikulasMalacky district · borehole or well · 6.5 km from the fishing district
natural substances only2017 to 2025
Horne Oresany – Nove DomyTrnava district · spring · 7.7 km from the fishing district
no exceedance in 20252017 to 2025
Plav.podhradie – RajtarkaMalacky district · spring · 8.8 km from the fishing district
no exceedance in 20252017 to 2025
Jablonica – StuzkovaSenica district · spring · 9.0 km from the fishing district
no exceedance in 20252017 to 2025
Fishing district number2-4570-1-1
Depth: Deep, over 6 m
Bottom: Muddy bottom
Watercourse line: Smooth line
Shade: Sunny, up to 10% shade
Vegetation: Willow
Vegetation: Alder
Water temperatureAn estimate from the air temperature of the last few days. The actual temperature may differ by 1 to 3 °C.
Water stageNo gauging station; the surface area is tracked by satellite.
Weather and pressureA forecast model for the fishing district's coordinates, not a measurement on the bank.
Depths and bedA model from spot heights of the original terrain before flooding.
Clarity, bloom and iceSentinel-2 satellite, last usable image 9 days ago.
Water chemistryQuality assessment from the nearest SHMÚ monitoring site.
Fish in the fishing districtThe fishing district's stocking plan. Nobody has recorded a catch here yet.
Rules and permitsThe act, the decree and the list of fishing districts. Check local exceptions in your permit.
Fishing district locationThe location is approximate, based on the description of the fishing district boundaries.
Geology
Radon risk
Uranium (eU)
Gamma radiation
Magnetics