Fishing district boundaries: Čiastkové povodie rieky Hron od železničného mosta nad sútokom Slatiny a Hrona po ústie potoka Lukavica. Úsek od mosta pri gymnáziu vo Zvolene po hať MVE na sídlisku Západ, vrátane športového kanálu a vyústenia z MVE je CHRO – zimovisko The score, the best window of the day and what pushes it up or down Loading data… Water level, temperature, modelled flow and gradient Zvolen – Hron · level stable The level is measured at an SHMÚ gauge; it is not the depth of the water at the fishing district. Loading data… Gentle gradient The current is noticeable, with shallows and slacks alternating. A transition between a lowland and a foothill watercourse. 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 36 min. Full moon around 24 Nov, new moon around 9 Nov. The 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. Course of the water, spots along the water, character and basic data The line shows the course of the fishing district according to the "Rybárske revíry" data 2026. Verify access points and exact boundaries on site. The most common type: shallows alternate with deeper spots and fish move according to the time of day and temperature. Well-oxygenated water and plentiful food (aquatic insect larvae). Typical of the grayling and barbel zones; gravel bars also serve many fish as spawning grounds. Typical of fast mountain and foothill streams. There are shelters for trout and other fish among the stones, but your rig often gets snagged. 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. Gentle bends: on one section you will find both deeper scours and shallower bars. A balanced stretch: there is a source of insects and also enough light for aquatic plants. 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. Tall, fast-growing trees. They provide shade and insects, and branches and leaves fall into the water. Fish can move freely along the watercourse; the section is more continuous. 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. Spots within 3 km of the watercourse are shown. Closed season, fishing hours, minimum sizes and daily limit. For guidance only: check them in the fishing regulations of the fishing district 1 Jan – 31 May fishing for all fish prohibitedoutside this period Exception: on waters where huchen occurs, from 1 Nov to 31 Dec fishing for huchen is possible only with a huchen fishing permit (§ 13, para. 4 and § 19 of the Act). 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). June, July, August4.00 – 22.00 h September, October5.00 – 21.00 h November, December7.00 – 19.00 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 district or the fishing guard. This is a summary. For baits, hooks and groundbait also read the fishing regulations of the 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 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 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, sabre carp) 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 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 sunbleak, Prussian carp, European perch, roach, loach (slíž severný) 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). Nearest fishing districts in the same river basin Loading the 3D terrain model… Water quality, river basin, bottom, fish, aquatic insects, wildlife and hazards from open databases. Except for wildlife and hazards, they are also included in the activity score. We assessed 16 factors; 4 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. nitrates typically 20.1 mg/l (standard 50), nitrites above the standard at 1 of 8 stations Groundwater reaches streams as base flow and carries nitrogen from fields and waste. Nitrates feed algae and contribute to nighttime oxygen crashes; nitrites are toxic to fish. Nitrites and ammonium can also be natural in deep groundwater, so at most one point is deducted for them. The data reliability is 100% (8 stations within 10 km, nearest 0.2 km, data from 2025), and the adjustment was applied in full. Groundwater reaches streams as base flow. The typical nitrate value from stations within 10 km (moderate from 25 mg/l, high from 50 mg/l, which is the drinking-water standard) shows how much nitrogen the water brings: it feeds algae and contributes to nighttime oxygen crashes (Camargo et al. 2005). Nitrites and ammonium above the standard at any station add one point, because nitrites are toxic to fish (Lewis and Morris 1986); in deep groundwater they can also be natural, hence only one point. The adjustment is multiplied by the reliability of the data. Sources: SHMÚ, groundwater; Camargo et al. 2005; Lewis and Morris 1986 catchment above the spot 1,970 km², average flow 19.8 m³/s, HydroRIVERS A large river has a more stable temperature and water level. Small streams heat up and dry out quickly in heat waves; large rivers are more stable. Angling practice and physical reasoning. Clays and loams, ŠGÚDŠ A fine-grained bottom is not typical of trout waters; the water clouds more easily. Trout production is higher in hard limestone waters (Almodóvar et al. 2006), but in Irish watercourses geology did not change trout density and the channel structure was decisive (Lehane et al. 2004). The evidence diverges; the weight is small. Sources: Almodóvar et al. 2006; Lehane et al. 2004 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 dependence of catches on swarming 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. In the yearbooks for 2022 to 2025 this site has no unmet indicator. The location of the site is only approximate (based on the water body), so the actual sampling point may be elsewhere on the watercourse. The data comes from the SHMÚ yearbooks (surface waters 2022 to 2025). The yearbook lists the sites that failed the standard; a site missing from the yearbook is not considered clean. We determine the distance and the match of the watercourse name ourselves, so the assignment is indicative. Exceeded in 2025: Measured values, year 2025, sampling 16 Sep 2025 (2 samplings, the highest value of the year for each substance): In the yearbooks 2017 to 2025 no exceedance of the standard is recorded at the station. Measured values, year 2025, sampled 14 Jul 2025: Exceeded in 2025: Measured values, year 2025, sampling 22 Sep 2025 (2 samplings, the highest value of the year for each substance): Exceeded in 2025: Measured values, year 2025, sampling 8 Oct 2025 (2 samplings, the highest value of the year for each substance): In the yearbooks 2017 to 2025 no exceedance of the standard is recorded at the station. Measured values, year 2025, sampled 29 Jul 2025: Exceeded in 2025: Measured values, year 2025, sampled 12 May 2025: Last exceeded in 2017: Measured values, year 2025, sampling 22 Sep 2025 (2 samplings, the highest value of the year for each substance): In the yearbooks 2017 to 2025 no exceedance of the standard is recorded at the station. Measured values, year 2025, sampling 11 Nov 2025 (2 samplings, the highest value of the year for each substance): 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). Treatment plants within 2 km of the fishing district. The treatment plant need not lie upstream of the fishing district; we do not assess the watercourse at the plant. Load is the ratio of the pollution produced to the capacity of the treatment plant (PE = population equivalent). Watercourse from the HydroRIVERS database matched with the fishing district, line deviation about 241 m The data come from a global database with a coarser resolution (tens of metres), so they are only approximate for small waters. Depth and volume are model averages. After rain the water quickly turns turbid and fish hunt more by smell. According to the geological map: fluviálne sedimenty: litofaciálne nečlenené nivné hliny, alebo piesčité až štrkovité hliny dolinných nív a nív horských potokov, holocén The fishing district description states the bottom: gravel, bedrock, stony, fine-grained, muddy; the geological map shows something different, and the district description is more precise. 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. 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. A typical value from 8 groundwater stations within 10 km of the fishing district (nearest 0.2 km), measured in 2025. Closer stations carry more weight. This is groundwater near the 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, 8 stations. 0,01mg/l above the standard somewhere Standard 0.5 mg/l. Range 0.005 to 0.66 mg/l, 8 stations. Above the standard: 1 of 8 (Hronsek, 2.6 km from the fishing district). 20,1mg/l above the standard somewhere Standard 50 mg/l. Range 0.5 to 56.4 mg/l, 8 stations. Above the standard: 1 of 8 (Zvolen, 0.5 km from the fishing district). 3,66mg/l less oxygen Mark on the dial: 9 mg/l, the guideline for salmonid waters. Range 0.98 to 9.54 mg/l, 8 stations. 12,1°C warmer Range 8.8 to 14.8 °C, 8 stations. 7,16 suitable for fish Range 6.64 to 7.77, 8 stations. 3,43mmol/l hard Range 0.95 to 4.27 mmol/l, 7 stations. 0,003mg/l far below the standard Standard 0.2 mg/l. Range 0.001 to 0.17 mg/l, 7 stations. 0,013mg/l above the standard somewhere Standard 0.05 mg/l. Range 0.007 to 0.72 mg/l, 7 stations. Above the standard: 3 of 7 (highest: Zolna, 7 km from the fishing district). 58,9mg/l below the standard Standard 250 mg/l. Range 2.8 to 130 mg/l, 7 stations. 44,8mg/l far below the standard Standard 250 mg/l. Range 6.1 to 100 mg/l, 7 stations. 79mS/m close to the standard Standard 125 mS/m. Range 22 to 89.2 mS/m, 8 stations. 32% of standard below the standard Highest: Arsenic 6.2 µg/l (62% of the standard, 2.6 km from the fishing district). 7 stations. 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. 0% of standard not detected Below the limit of quantification: substances from this group were not detected in the samples. 4 stations. 0% of standard not detected Below the limit of quantification: substances from this group were not detected in the samples. 2 stations. Sources 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. Black with yellow spots. Lives in deciduous forests by clean mountain streams; the larvae develop in the stream. An insect with aquatic larvae. Adults live only briefly and hatch all at once in swarms. A small bird that dives and runs along the bed of rapids after insect larvae. Nests by clean mountain streams. A large white heron that hunts fish and frogs in the shallows. In Slovakia its numbers are rising, and in winter it can also be seen by watercourses. The largest native toad. In spring it migrates to water, where it breeds. Predatory insect. The larvae live underwater for several months to years; adult dragonflies hunt in the air above the water. A harmless snake with two yellow spots on the nape. It swims well and hunts frogs, fish and newts. At dusk it flies just above the surface and hunts aquatic insects, mainly midges and mayflies. 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 non-native turtle from America that got into the wild from home pet keeping. It is invasive in Europe. A riparian tree whose roots reach below the water surface. An invasive herb from East Asia that forms dense stands up to three metres tall. An invasive plant from the Himalayas, up to two metres tall, with pink flowers. It overgrows the banks of watercourses. A wetland plant with a brown cylindrical fruiting spike. A tall wetland plant with yellow flowers that grows on damp banks. Tall grass that forms extensive reed beds around ponds and on banks. Lives in the mountain forests of northern and central Slovakia. Near water it hunts fish and drinks. How to protect yourself: In mountain districts move noisily, do not leave fish, entrails or bait leftovers near your tent, and store food away from where you sleep. If you see a bear, do not run, talk calmly and back away slowly. Never approach the cubs. 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. 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. A venomous snake that basks on rocky slopes, in wetlands and at forest edges near water. How to protect yourself: It is shy and bites only when threatened. On rocky banks do not reach with your hand between the stones, and wear sturdy footwear. After a bite stay calm, do not move the affected limb and call 112. 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. A shy predator of the forests. It comes to the water at night and at dusk. How to protect yourself: Attacks on people are very rare. Keep your camp tidy, do not feed wildlife and keep your dog on a leash. 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. 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. 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. low Bedrock with a low radon share. 2,9ppm common Typical background of the rocks. 8,3ppm around the crustal average Natural background of the rocks. 1,30% below the crustal average Natural background of the rocks. 54nGy/h around the world average Natural background of the bedrock. -67nT below 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 250 m fault nearby Tectonic fault on the geological map. 0 none marked None within 1 km. covered by younger sediments 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. Naplaveniny The prevailing group of rocks according to the map. Gravels, sands and loams in the valley tell about the valley floor, not about the rock in the catchment. The water chemistry is determined mainly by the bedrock higher up above the spot. The rock at a single spot does not determine the chemistry of all the water: that depends on the bedrock across the whole catchment above the spot. The figure serves as a hint, not as a measurement. Highest forecast Kp in the next 24 hours: 5.0 (geomagnetic storm). 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. Sentinel-2 (optical) and Sentinel-1 (radar), updated roughly every 6 days Satellite data for this fishing district is being prepared. It is usually ready within a few minutes; refresh the page later. Changes in the surroundings and nature from 2018 to 2024: 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.
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.Water
Water level
Water levelThe water level at the nearest SHMÚ gauge in centimetres above the gauge zero. It is the water level at the station, not the depth of the water at the fishing district.Modelled flow
Modeled flowAn estimate of the amount of water in the river (m³/s) from the GloFAS model, not a measurement. The resolution is about 5 km, so on small streams it may show a larger river nearby.Elevation profile of the watercourse
Elevation profileHow the altitude of the watercourse changes downstream. It is calculated from a digital relief model (tens of metres), not from a water-level measurement, so it is approximate, especially for narrow streams.Weather and forecast
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
MoonMoon 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.
Map and fishing district data
48.5923, 19.12855
OpenStreetMap
Fishing district details
Characteristics
What this means for anglersexplanation of the bottom, vegetation, watercourse line and other data of this fishing district
Outfalls and risk spots
Podrobnosti
Law and fishing rules
Closed season for all fish
Section 13, paragraph 2 of the ActDaily fishing hours
§ 11 of the DecreeRods, baits and fishing days
§ 17 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
Before and after fishing
News from the organization and catches from the fishing district
Catches from this fishing district
More fishing districts on the Hron watercourse
Nearby fishing districts
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Water according to public sources
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.Pollution−1
What we know about it
Watercourse, reservoir and bottom0
What we know about it
What we know about it
Life by the water0
What we know about it
Do not change the score
Water pollution
Water pollution (SHMÚ)Water quality indicators that fail the standards at the nearest monitoring site on the same watercourse in the SHMÚ yearbooks for 2022 to 2025.Surface water: nearest monitoring site
Other sites on the same watercourse
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 (8 stations)
Show 5 more
Wastewater treatment plants
Wastewater treatment plants near the fishing districtPlants within 2 km of the district: overload, compliance with EU requirements and discharged load (BOD₅, COD, nitrogen, phosphorus in tonnes per year).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.Bottom 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.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
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
PFAS (“forever chemicals”)
Solvents and benzene
PAHs (combustion, petroleum substances)
How it affects fish and the water
Fish, wildlife, 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: August.
About the species
WildlifeFire salamander
Most records: May.
About the species
WildlifeMayflies
Most records: March.
About the species
BirdWhite-throated dipper
Most records: April.
About the species
BirdGreat egret
Most records: February.
About the species
WildlifeCommon toad
Most records: May.
About the species
WildlifeDragonflies
Most records: June.
About the species
WildlifeGrass snake
Most records: June.
About the species
WildlifeDaubenton's bat
Most records: August.
About the species
WildlifeEurasian beaver
Most records: October.
About the species
WildlifePond slider
Most records: August.
About the species
PlantBlack alder
Most records: July.
About the species
Invasive plantJapanese knotweed
Most records: August.
About the species
Invasive plantHimalayan balsam
Most records: August.
About the species
PlantBroadleaf cattail
Most records: July.
About the species
PlantYellow flag iris
Most records: June.
About the species
PlantCommon reed
Most records: July.
About the species
RiskBrown bear
Most records: June.
How to protect yourself
RiskMosquitoes
Most records: September.
How to protect yourself
RiskGiant hogweed
Most records: July.
How to protect yourself
RiskCommon viper
Most records: June.
How to protect yourself
RiskCastor bean tick
Most records: October.
How to protect yourself
RiskGray wolf
Most records: July.
How to protect yourself
RiskWild boar
Most records: August.
How to protect yourself
Photo credits
Ground 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).Bedrock radon risk
Uranium (eU)
Thorium (eTh)
Draslík (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
Rocks and water chemistry
Rocks and water chemistryThe prevailing group of rocks at the water spot and what it usually means for the hardness, pH and richness of the water.Bedrock at the water spot
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).From space: what the Copernicus satellites show
Historical images
Waning crescent8% illuminated
Depth: Medium, 1–3 m
Bottom: Gravel bottom
Bottom: Stony bottom
Bottom: Muddy bottom
Watercourse line: Slightly undulating line
Shade: Partly shady, 11–40%
Vegetation: Willow
Vegetation: Alder
Vegetation: Poplar
Cross-channel structures: none
COV ZvolenWastewater discharge point
0,0 kmCOV ZvolenWastewater treatment plant · capacity 80,500 PE
0,1 kmNobody has recorded a catch in this fishing district yetBe the first: after approval it will also appear here in the ranking.
Public data about this water hardly change the activity score.
Nitrogen in groundwater (SHMÚ)Level of evidence: Partially supported
−1
Watercourse sizeLevel of evidence: Angling practice
+1
Riverbed by geologyLevel of evidence: Hypothesis
−1
Aquatic insect swarmingLevel of evidence: Angling practice
0
Tekovská BreznicaHron, rkm 88.9 · 4.6 km from the fishing district
no unmet standard2022202320242025
SliacZvolen district · borehole or well · 0.2 km from the fishing district
natural substances only2017 to 2025
ZvolenZvolen district · borehole or well · 0.3 km from the fishing district
no exceedance in 20252017 to 2025
ZvolenZvolen district · borehole or well · 0.5 km from the fishing district
substances from human activity2017 to 2025
HronsekBanská Bystrica district · borehole or well · 2.6 km from the fishing district
substances from human activity2017 to 2025
PodzamcokZvolen district · borehole or well · 6.3 km from the fishing district
no exceedance in 20252017 to 2025
ZolnaZvolen district · borehole or well · 7.0 km from the fishing district
natural substances only2017 to 2025
KremnickaBanská Bystrica district · borehole or well · 7.5 km from the fishing district
no exceedance in 20252017 to 2025
Cacin – pod Stranou 1Banská Bystrica district · spring · 9.8 km from the fishing district
no exceedance in 20252017 to 2025
COV Zvolen0.1 km from the fishing district · capacity 80,500 PE · mechanical, biological, nitrogen and phosphorus removal
within the standard51% of capacity
Clays and loams
Geology
Radon risk
Uranium (eU)
Gamma radiation
Magnetics