Studying the relationship between spatial fish distributions and trawl catches ...

• Main Authors: Trenkel, Verena M., Godø, Olav Rune, Handegard, Nils Olav, Patel, Ruben
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2004 - R - Theme session 2024
• Subjects: Fisheries and aquaculture; Technologies and data; Barents Sea; Gadus morhua
• Online Access: https://dx.doi.org/10.17895/ices.pub.25349779; https://ices-library.figshare.com/articles/conference_contribution/Studying_the_relationship_between_spatial_fish_distributions_and_trawl_catches/25349779

No abstracts are to be cited without prior reference to the author.We propose an approach for studying the relationship between spatial fish distributions and the distribution of numbers in trawl catches. Individual spatial fish distributions are derived from acoustics data collected with a drifting buoy by tracking individual fish. The spatial distribution of these individual fish is then characterised using Generalised Additive Models (GAM). The catch distribution is obtained empirically. A model relating the spatial fish distribution and the catch distribution is then developped. This paper concentrates on the first part of the approach, the identification of the spatial fish distribution from acoustic data, which is illustrated for a demersal example from the Barents sea including mainly cod (Gadus morhua) and haddock (Melanogrammus aeglefinus). ...