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Updated: Feb 18, 2026

Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria
Published on: July 20, 2017
Size-dependent social attraction and repulsion explains the decision of Atlantic cod Gadus morhua to enter baited
N Anders1,2, A Fernö1, O-B Humborstad2
1University of Bergen, Department of Biology, PO Box 7803, N-5020, Bergen, Norway.
Abstract:
The present study tested whether the presence of already retained fishes inside baited fish pots acted as a social attraction and affected the entrance probability of Atlantic cod Gadus morhua in a fjord in northern Norway. Video analysis revealed that the probability of an entrance initially increased with the presence of low numbers of fishes inside the pot, but subsequently decreased at a critical number of caught fishes. The critical number was dependent on the size of the G. morhua attempting to enter. This demonstrates that social attraction and repulsion play a role in G. morhua pot fishing and has important implications for the capture efficiency of fisheries executed with pots.
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