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Brage IMR
Research . 2017
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Forsøksfiske for selektiv fangst av berggylt

Authors: Halvorsen, Kim Tallaksen; Bjelland, Reidun; Jørgensen, Terje; Skiftesvik, Anne Berit;

Forsøksfiske for selektiv fangst av berggylt

Abstract

Villfanget leppefisk brukes som rensefisk mot lakselus i oppdrett. I de tekniske reguleringene for fisket etter leppefisk er det satt åpningsdatoer for fisket. Disse skal sikre at hovedgytingen er over før fisket starter. På Sørlandet var det i flere år åpnet for et tidlig fiske etter berggylt (hovedsakelig med ruser). Forsøk viste imidlertid at dette fisket hadde høyt innslag av andre leppefisk. Et nytt konsept med større rister montert i enden av teiner og ruser som utnytter fluktreaksjonen til leppefisk under trekking ble testet i et forsøksfiske i juni 2016. Fjorten kommersielle fiskere deltok i forsøksfisket. Resultatene viser at det med bruk av de nye ristene med 25 mm spaltebredde i teiner ble tatt fangster som bestod av gjennomsnittlig 81 % berggylt. For ruser med enderist med samme spilebredde var i gjennomsnitt 55 % av fangsten berggylt, og variasjonen mellom fiskere var betydelig større enn for teiner. Forsøket indikerer at det er mulig å drive et selektivt fiske etter berggylt med teiner. Det må imidlertid avklares om hovedgytingen er over før det kan anbefales å åpne for et tidligfiske etter berggylt

Wild-caught wrasse is used as cleaner fish to reduce sea lice infestations in salmonid aquaculture in Norway. Wrasses are protected during the spawning period (May-July), but salmon farmers and fishermen have requested to conduct a fishery for ballan wrasse before the general opening date for all wrasse species. In this project we investigated whether selection grids covering the short end of pots and last ring in fyke nets could effectively catch ballan wrasse with low by-catch of corkwing and goldsinny wrasse. Fourteen fishermen participated in an experimental fishery in June 2016. Pots with 25 mm gaps achieved an average catch consisting of 81 % ballan wrasse of the total catch of target wrasse species. Fyke nets were on average less effective and showed larger variation among fishermen. Surveys of the ballan wrasse spawning period should be conducted before such a fishery is being allowed to avoid disturbing the spawning.

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Norway
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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