Effect of netting direction and number of meshes around on size selection in the codend for Baltic cod (Gadus morhua)

• Published in: Fisheries Research
• Main Authors: Wienbeck, Harald, Herrmann, Bent, Moderhak, Waldemar, Stepputtis, Daniel
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2011
• Subjects: article; Text; Cod (Gadus morhua); Baltic Sea; Demersal trawls; T90; Turned mesh codend; Diamond mesh codend; size selection; Number of meshes in codend circumference; SELNET; Gadus morhua
• Online Access: https://doi.org/10.1016/j.fishres.2011.01.019; https://www.openagrar.de/receive/timport_mods_00034399; https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00034399/dn048262.pdf

We investigated experimentally the effect that turning the netting direction 90? (T90) and halving the number of meshes around in the circumference in a diamond mesh codend had on size selection of Baltic cod. The results generally agreed with predictions of a previous simulation-based study. Both modifications had a significant positive effect on the size selection of cod. The best selection results were obtained for a codend in which both factors were applied together. For that codend, very little between-haul variation in cod size selection was detected, especially compared to the reference codend in which none of the modifications were applied.