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- Title
INCLUDING COD (GADUS MORHUA) BEHAVIOURAL ANALYSIS TO EVALUATE ENTRANCE TYPE DEPENDENT POT CATCH IN THE BALTIC SEA.
- Authors
Ljungberg, Peter; Lunneryd, Sven-Gunnar; Lövgren, Johan; Königson, Sara
- Abstract
In order to allow cod pots to be an alternative to gillnet fisheries, catch has to be increased. In this study we evaluate pot entrance modifications as a means to increase pot catch efficiency. We connect entrance modifications to in-situ cod behavioural events in relation to pot entrances. Pots with entrances lacking funnels allow for a higher proportion of entering cod but also to a larger extent allow cod to exit pots. We show how pots equipped with funnel entrances generate increased catch by preventing escape and, through that, serve as an important factor in regulating cod pot catches. Importantly, we show how entrances equipped with funnels, although inducing a higher proportion of turn behaviour along with increased time in entering, result in a higher net effect in catch than the positive effect in entry if not using funnels. With target species behaviour being a strong regulator of gear catch efficiency, we stress the importance of in-situ observations of specific behavioural components in the fishing gear development process.
- Subjects
CODFISH; FISH traps; FISH behavior
- Publication
Journal of Ocean Technology, 2016, Vol 11, Issue 4, p48
- ISSN
1718-3200
- Publication type
Article