Methodology
Sources and methodology: how we check the guides and what people search for on Google
Search data
- Reading
- 5 min
- Questions
- 8
- Sources
- 4
- As of
- 6 Nov 2026
Every piece of advice in the guides has a source and an evidence level. Here we explain how we chose the sources, what the levels mean, what people search for most on Google and what our guides do not yet cover.
How we proceeded
Six steps from the regulation to the evidence label
- Regulations. We read the wording of Act no. 216/2018 Coll. and Decree no. 381/2018 Coll. on slov-lex.sk and refer to the sections.
- Official sources. We took prices, membership and fees from the pages of the Slovak Anglers' Union and from the slovensko.sk portal.
- Scientific papers and tests. For mortality in catch and release, nutrients from bait and knot strength we looked for peer-reviewed papers and measurements, and we state how big the sample is.
- What people ask. We looked at Google Trends and Google Autocomplete in Slovakia and abroad to learn what people ask about.
- Evidence level. Each source has been given a level and it is displayed with claims.
- Unsupported claims. What we could not verify, we labeled as practice or unverified, or left out.
Evidence levels
How to read the labels on claims
| Level | What it means |
|---|---|
| Regulation | The binding text of the Act or Decree. |
| Official source | Information from an authority, a ministry or the Slovak Anglers' Union. |
| Study | A peer-reviewed scientific paper or a summary of several papers. |
| A test with a small sample | A measurement or test with a small number of trials; the result is only indicative. |
| Secondary source | A news, expert or encyclopedic article, not a primary source. |
| Practice | Experience of anglers and manufacturers without scientific proof. Use it as a starting point, not as the truth. |
| Search data | Relative interest on Google. It tells us what people search for, not what is true. |
| Unverified | A bibliographic entry; we did not open the text, so we claim nothing from it. |
What people search for on Google
Observation from 6 Nov 2026
Search dataThe data from Google Trends are relative interest from 0 to 100, not a number of searches. For rarely searched terms the data are sparse and values close to zero are not reliable.
Slovakia, 12 months
- fishing license6,8
- minimum size4,1
Worldwide, 12 months
- fishing license49,4
- catch and release5,5
- boilies3,5
- how to start fishing1,8
- fishing knots1,6
| Area | Term | Relative interest |
|---|---|---|
| Slovakia, 12 months | fishing license | 6,8 |
| Slovakia, 12 months | minimum size | 4,1 |
| Worldwide, 12 months | fishing license | 49,4 |
| Worldwide, 12 months | catch and release | 5,5 |
| Worldwide, 12 months | boilies | 3,5 |
| Worldwide, 12 months | how to start fishing | 1,8 |
| Worldwide, 12 months | fishing knots | 1,6 |
The other Slovak terms compared had values close to zero. Interest in the fishing license peaked from late December to early January (28 Dec – 11 Jan) and around 15 March. We do not know the cause; for example, the peak around New Year may be related to the renewal of annual licenses. It is only an assumption.
We used Google Autocomplete suggestions only as an aid in wording the questions so that they sound the way people ask. They are not a measurement and change by place and time (Google Autocomplete).
Limitations and what we do not know
Where our guides are weak
- Wording of the regulations. We read the wording of the Act from 1 Jan 2022 and of the Decree from 1 Jan 2019; we found no newer wording. A newer wording may exist. The binding text is on slov-lex.sk.
- Amendment from 1 Jan 2027. An electronic license and permit through a mobile app is, according to Právne noviny, only a draft. We did not find the number of the bill and did not verify its validity.
- Prices. Prices of permits and fees change every year. The data are from the price list for 2026.
- An exam for the license. In the text of the Act that we read, an exam is not a condition for issuing a license. The SRZ requires an exam for membership. If you want to be sure, ask the office.
- Night fishing. The Act has two wordings that diverge. We show both and refer to the district's regulations.
- Studies and tests. Knot strength measurements have small samples. We did not open the work of Kasumyan and Døving (2003) and claim nothing from it.
- Sources read through a tool. We read the texts of some pages through an automatic tool that summarizes them. For legal data we therefore recommend verifying the binding wording.
- Fines. The range of €100 to €1,000 (individuals) and €500 to €15,000 (legal entities and businesses) is according to the list we read. The list may not be complete.
Register of sources
Everything we opened, with level and date
The register includes only what we actually opened. A figure whose text we have not seen has the level unverified.
| Source | Level | Opened |
|---|---|---|
| Act no. 216/2018 Coll. on fisheries (wording effective 1 Jan 2022)Slov-Lex, Ministry of Justice of the SR – Wording as read on 1 Jan 2022; we found no newer one. Sections used: §§ 12 to 20, 23 to 25, 39 and 40. | Regulation | 6 Nov 2026 |
| Decree of the Ministry of the Environment of the SR no. 381/2018 Coll. implementing the Fisheries Act (wording valid from 1 Jan 2019)Slov-Lex, Ministry of Justice of the SR – Wording as read on 1 Jan 2019; we found no newer one. Sections used: §§ 10 to 12 and 14 (protection period, daily fishing hours, minimum sizes, daily catch). | Regulation | 6 Nov 2026 |
| Hunting and fisheries – fishing license (life situation)Central Public Administration Portal slovensko.sk – License fees (weekly €3, monthly €5, annual €10, three-year €25), fee exemptions, applying online as well. | Official source | 6 Nov 2026 |
| For anglers – the union's directory (fishing regulations, price list, forms, calendar of competitions)Slovak Anglers' Union (SRZ) – A directory with links to fishing regulations, the permit price list for 2026, forms and the calendar of competitions. | Official source | 6 Nov 2026 |
| SRZ Organizational Rules (valid from 1 Jul 2025)Slovak Anglers' Union (SRZ) – Admission of members (January to March), the fishing exam from the age of 15, exemption for graduates of schools with a fisheries subject, entry fee and membership contribution. We read the document but the direct link was not kept; check the current admission conditions with your local SRZ organization. | Official source | 6 Nov 2026 |
| Permit price list 2026Slovak Anglers' Union (SRZ) – Union permits: carp adults €75, children 6 to 14 years €15, children 3 to 5 years €1; grayling adults €70, children 3 to 14 years €10. A special permit for all SRZ districts: members €600, non-members €1,200. | Official source | 6 Nov 2026 |
| Guest permitsSlovenský rybársky zväz (SRZ) – Ceny na rok 2026 pre 24 štandardných revírov: dospelý člen denné 15 €, týždenné 40 €; dospelý nečlen denné 40 €, týždenné 150 €; dieťa člen týždenné 5 €, dieťa nečlen týždenné 10 €. Niektoré vody (napr. Orava, Sokolčianska zátoka, Bešeňová, Palcmanská Maša) majú vlastné ceny. Ceny sa menia každý rok. | Official source | 6 Nov 2026 |
| eSRZ – online permit salesSlovak Anglers' Union (SRZ) – Official online permit sales; current prices for 2026 are there. | Official source | 6 Nov 2026 |
| Fishing regulationsSlovak Anglers' Union (SRZ) – Fishing conditions on specific districts; they take precedence over the general overview in this guide. | Official source | 6 Nov 2026 |
| Appropriating catches (§ 14 of the Decree) – SRZ commentarySlovak Anglers' Union (SRZ) – Interpretation of the daily weight and the number of catches; for species groups (blue, green, yellow) we also drew on the SRZ graphic from January 2026. | Official source | 6 Nov 2026 |
| Appropriating catches (§ 14 of the Decree) – another SRZ commentarySlovak Anglers' Union (SRZ) – Continuation of the explanation of § 14 of the Decree. | Official source | 6 Nov 2026 |
| Fishing ticket: procedure, price and news from 2027Právne noviny – The article describes a draft: license and permit electronically through a mobile app from 1 Jan 2027, if parliament passes the amendment. The number of the bill is not given in the article, and we have not verified its validity. | Secondary source | 6 Nov 2026 |
| Bartholomew A., Bohnsack J. A. (2005): A review of catch-and-release angling mortality with implications for no-take reserves. Reviews in Fish Biology and Fisheries 15: 129–154Springer – A review of 274 estimates from 53 studies: median mortality 11 %, mean 18 %, range 0 to 95 %. Mortality is higher with deep hooking, natural bait, removing deeply swallowed hooks, J-hooks, warm water and long fights or handling. | Study | 6 Nov 2026 |
| Fazekas et al. (2023): Scientific Reports 13: 17,691 (nutrients released from bait)Scientific Reports, Springer Nature (PMC) – An uneaten fish-meal feed mix released about 32 % of its nitrogen within 5 days; both baits released about 18 to 21 % of inorganic phosphorus within 12 hours. An excessive amount of uneaten bait can promote eutrophication in phosphorus-poor waters. | Study | 6 Nov 2026 |
| Comparing Measured Fluorocarbon Leader Breaking Strength with Manufacturer Claims (arXiv:1,202.5260)arXiv (preprint) – 8 fluorocarbon leaders around 15 lb, 5 trials without a knot and with a Uni knot, one spool from a brand. The knot reduced the strength of every line, and the stated strength differs from the measured one. Small sample. | A test with a small sample | 6 Nov 2026 |
| Testing knots (knot test)Ontario OUT of DOORS, Ontario Federation of Anglers and Hunters – A magazine test of knots on braided, fluorocarbon and monofilament line of 10 lb, 5 pulls per knot. The improved clinch on braided line always slipped at about 4 lb; the Rapala loop did not fail even once. Small sample. | A test with a small sample | 6 Nov 2026 |
| Improved Clinch KnotAnimated Knots by Grog – Tying procedure: about five turns, passing through the loop at the eye and then under the last turn; not suitable for lines above 30 lb. | Practice | 6 Nov 2026 |
| Uni KnotAnimated Knots by Grog – Postup uviazania: slučka pozdĺž vlasca, päť ovinov, namazať, utiahnuť, zosunúť, orezať. Zdroj uvádza zachovanie asi 82 % pevnosti vlasca (test M. Martina, nepreverené). | Practice | 6 Nov 2026 |
| Rapala KnotAnimated Knots by Grog – Tying procedure: overhand knot, the end through the lure's eye and back through the knot, three turns around the standing part, the end back through the knot and through the resulting loop, moisten, tighten. Note: Lefty Kreh did not consider the early version particularly strong. | Practice | 6 Nov 2026 |
| Kreh Loop (non-slip loop knot)Net Knots – Tying procedure for the non-slip loop: overhand knot about 25 cm from the end, the end through the eye and back through the knot, four to five turns around the standing part, back through the knot, moisten, tighten. The source does not give the strength. | Practice | 6 Nov 2026 |
| Surgeons Join KnotAnimated Knots by Grog – Tying procedure: two lines side by side, a loop of both, both ends twice through the loop, moisten, tighten by all four ends. Bulkier than the Blood Knot; it bends the line slightly in the knot. | Practice | 6 Nov 2026 |
| Fishing Knot Library: How to Tie the Albright Special Fishing KnotBass Pro Shops – Tying procedure: a loop of thicker line, about 25 cm of thinner line through it, 10 tight turns over both branches of the loop, the end back through the loop to the same side, tighten, trim. The number of 10 to 12 turns is also given in the photo description on Wikimedia Commons. | Practice | 6 Nov 2026 |
| How-To Tie an FG Knot, The Full BreakdownTackle Warehouse – Tying procedure: tensioned braided line, leader woven around it with 20 to 30 passes, two half hitches, tightening, trimming, two to four half hitches with the end of the braided line. The source does not give the strength. | Practice | 6 Nov 2026 |
| Palomar knotWikipedia – Tying procedure: doubled line 20 to 30 cm, a loop through the eye, an overhand knot, passing the hook through the loop, wet, tighten, trim to about 3 mm; suitable for braided line. | Secondary source | 6 Nov 2026 |
| BoilieWikipedia – Composition (base mix of fish meal, milk proteins, bird feed, semolina and soy flour; egg white as a binder; flavoring), boiling into hard balls, frozen and shelf-life boilies, sizes 8 to 40 mm. | Secondary source | 6 Nov 2026 |
| Hair rigWikipedia – Origin (Len Middleton and Kevin Maddocks, the 80s), self-hooking principle. We did not take the tying procedure from it. | Secondary source | 6 Nov 2026 |
| Kasumyan A. O., Døving K. B. (2003): Taste preferences in fishes. Fish and Fisheries 4: 289–347Fish and Fisheries, Blackwell Publishing (review article) – We read the text of the review (59 pages, a PDF supplied by the user) in the parts on the introduction, the classification of substances, amino acids, betaine, mixtures, threshold concentrations, species and individual specificity, the effect of temperature, experience, hunger and the relationship between smell and taste, and on use in fishing. These are laboratory experiments, mostly with young fish and agar pellets containing a single substance. The review says nothing about boilies or catchability. | Study | 6 Nov 2026 |
| Google Trends – comparison of terms (Slovakia, last 12 months; worldwide)Google – Relative interest (0 to 100), not the number of searches. For rarely searched terms the data are sparse. | Search data | 6 Nov 2026 |
| Google Autocomplete – query suggestions (Slovak and English)Google – Autocomplete suggestions capture how people phrase queries. The list changes by place and time. | Search data | 6 Nov 2026 |
Frequently asked questions
8 questions with short answers. Expand the one you are interested in.
What do the evidence levels mean?
A regulation is the binding text of an Act or a Decree. An official source is information from an authority or the SRZ. A study is a peer-reviewed work. A small-sample test is an indicative measurement. A secondary source is an article or an encyclopedia. Practice is the experience of anglers without proof. Search data speak of interest, not of truth. Unverified is a figure whose text we did not open.
Which wording of the Act do you rely on?
We read the wording of Act no. 216/2018 Coll. on fisheries in force from 1 Jan 2022 and of Decree no. 381/2018 Coll. in force from 1 Jan 2019. We found no newer wording, but one may exist. The binding wording is on slov-lex.sk. The data status is as of 6 Nov 2026.
How do I check the binding wording of the Act?
You will find the binding wording on slov-lex.sk in the Collection of Laws under number 216/2018 (Act) and 381/2018 (Decree). For a specific district, the fishing regulations and the permit from the district user also apply.
What do people search for most about fishing?
According to Google Trends from 6 Nov 2026, in Slovakia the greatest interest was in the term "rybársky lístok" (fishing license) (6.8) and "lovná miera" (minimum size) (4.1); the other compared terms had values close to zero. Worldwide, the greatest interest was in "fishing license" (49.4), then "catch and release" (5.5) and "boilies" (3.5). This is relative interest, not a number of searches.
Why do you label some tips as practice?
For gear, techniques and boilie preparation we found no peer-reviewed work that would confirm the advice. They come from anglers' experience and from descriptions in specialist web sources, so they have the evidence level practice. Use them as a starting point, not as proof.
No question was found for this search.
Sources
Each source shows the level of evidence and the date we opened it.
- Google Trends – comparison of terms (Slovakia, last 12 months; worldwide) Google. Opened 6 Nov 2026. Relative interest (0 to 100), not the number of searches. For rarely searched terms the data are sparse.Search data
- Google Autocomplete – query suggestions (Slovak and English) Google. Opened 6 Nov 2026. Autocomplete suggestions capture how people phrase queries. The list changes by place and time.Search data
- Act no. 216/2018 Coll. on fisheries (wording effective 1 Jan 2022) Slov-Lex, Ministry of Justice of the Slovak Republic. Opened 6 Nov 2026. Wording as read on 1 Jan 2022; we found no newer one. Sections used: §§ 12 to 20, 23 to 25, 39 and 40.Regulation
- Decree of the Ministry of the Environment of the SR no. 381/2018 Coll. implementing the Fisheries Act (wording valid from 1 Jan 2019) Slov-Lex, Ministry of Justice of the Slovak Republic. Opened 6 Nov 2026. Wording as read on 1 Jan 2019; we found no newer one. Sections used: §§ 10 to 12 and 14 (protection period, daily fishing hours, minimum sizes, daily catch).Regulation