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Catch and effort from a recreational trolling fishery in a large lake
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper.ORCID-id: 0000-0002-5903-0381
2016 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Over recent decades recreational fisheries have grown substantially throughout the world. Despite this increase, catches from recreational fisheries have often been ignored in fisheries management, although this is now being remedied. Monitoring recreational fisheries can be expensive, and the primary means used for monitoring is angler (creel) surveys, typically funded from sales of fishing licences. The studies presented in this thesis examine different approaches to monitoring recreational trolling fisheries’ catch and effort, where fishing licenses are not required and there are no reporting requirements. I present results from a complemented roving/mail-in survey undertaken during 2013-2014 to estimate recreational effort and catch of Atlantic salmon (Salmo salar) and brown trout (S. trutta) in the largest lake in the European Union, Lake Vänern, Sweden. I also evaluate different angler catch reporting methods (mail-in, tournament reports and face-to-face interviews) and compare catch rates within and among spring and fall fishing periods. In addition, mail-in survey data are examined for recall bias.

 

I estimate that 28.7 tonnes of salmon and trout combined were harvested by the recreational trolling fishery in 2014, more than the commercial and subsistence fisheries combined. Seasonal differences in both recreational effort and catch were observed. Effort, in boat hours, was significantly higher in spring than in fall. Catch rates of trout were higher in fall than in spring, but there were no seasonal differences in catches of salmon. Harvest per boat day did not differ significantly among catch reporting methods, indicating that all three methods could be useful for managers interested in harvest rates. In contrast, total and released catch per boat day differed among reporting methods, with tournament anglers catching more fish in total. Finally, there was little evidence for recall bias in mail-in surveys, indicating that mail-in surveys are useful for collecting unbiased catch data. My study is the most comprehensive angler survey to date for Lake Vänern, and my results should be of immediate use to local fisheries managers and should also be of interest to researchers and managers interested in estimating catch and effort for fisheries at large spatial scales.

Abstract [en]

Over the past several decades recreational fisheries have grown substantially throughout the world. Until recently, however, recreational catch has been ignored in the management of many important fisheries. The studies presented in this thesis examine different approaches to monitoring recreational trolling fisheries’ catch and effort in Lake Vänern, Sweden, the largest lake in the European Union. Paper I presents results from a complemented roving/mail-in survey, designed to estimate recreational effort and catch of Atlantic salmon (Salmo salar) and brown trout (S. trutta). The results show that the recreational trolling fishery today harvests more salmon and trout annually than the commercial and subsistence fisheries combined, and that there are seasonal patterns in effort and catch. Paper II evaluates different angler catch reporting methods (mail-in, tournament reports, and face-to-face interviews), compares catch rates within and among spring and fall fishing periods and examines mail-in data for recall bias. Harvest per boat day did not differ significantly among catch reporting methods, indicating that all three could be useful for estimating harvest rates. However, tournament anglers had higher rates for released catch. Finally, there was little evidence for recall bias in mail-in surveys. In summary, this thesis has developed the framework for a recreational angler survey program for Lake Vänern, and should be of interest to researchers and managers interested in estimating catch and effort for fisheries at large spatial scales.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstads universitet, 2016. , s. 21
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2016:28
Nyckelord [en]
Angler survey, atlantic salmon, brown trout, complemented survey, Lake Vänern, recreational fisheries, fisheries management, recall bias
Nationell ämneskategori
Ekologi
Forskningsämne
Biologi
Identifikatorer
URN: urn:nbn:se:kau:diva-41780ISBN: 978-91-7063-706-3 (tryckt)OAI: oai:DiVA.org:kau-41780DiVA, id: diva2:923964
Presentation
2016-06-09, 9C203, Karlstad, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2016-05-19 Skapad: 2016-04-21 Senast uppdaterad: 2019-07-11Bibliografiskt granskad
Delarbeten
1. Estimating effort and catch of a recreational trolling fishery in one of Europe’s largest lakes
Öppna denna publikation i ny flik eller fönster >>Estimating effort and catch of a recreational trolling fishery in one of Europe’s largest lakes
Visa övriga...
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Ekologi Vilt- och fiskeförvaltning
Forskningsämne
Biologi
Identifikatorer
urn:nbn:se:kau:diva-42044 (URN)
Tillgänglig från: 2016-05-18 Skapad: 2016-05-18 Senast uppdaterad: 2019-04-25Bibliografiskt granskad
2. Comparing mail-in, interview and tournament catch rates for a recreational salmonid fishery
Öppna denna publikation i ny flik eller fönster >>Comparing mail-in, interview and tournament catch rates for a recreational salmonid fishery
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Vilt- och fiskeförvaltning Ekologi
Forskningsämne
Biologi
Identifikatorer
urn:nbn:se:kau:diva-42046 (URN)
Tillgänglig från: 2016-05-18 Skapad: 2016-05-18 Senast uppdaterad: 2019-04-25Bibliografiskt granskad

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