The capability of square-meshes and fixed-shape meshes to control codend size selection

• DOI: 10.1016/j.fishres.2023.106704
• Publication Date: 2023-04-11T11:25:37Z
• Authors: Zita Bak-Jensen; Bent Herrmann; Juan Santos; Valentina Melli; Daniel Stepputtis; Jordan P. Feekings
• Keywords: Square (algebra)

Trawl codends are commonly made of diamond-mesh netting. However, vary in mesh geometry along its length and during fishing due to catch build up. This introduces variability the size selection process. phenomenon compromises rationality regulating exploitation patterns trawl fisheries through adjustments codend size. One technical solution often applied achieve more well-defined is turning netting 45 degrees (square-mesh). there a lack evidence that square-mesh result constant selectivity. Therefore, we aimed at quantifying codends. We tested selectivity three codends; standard codend, two rigid where geometries were fixed diamond shape with an opening angle 60° square shape, respectively. The used establish baselines limited selection. these was compared results - previously obtained for codend. Using Atlantic cod (Gadus morhua) as case study, demonstrated had significantly larger Moreover, found no lower than same These demonstrate use not sufficient reduce Additionally, sizes fish retained strongly dependent on openness. conclude profound re-thinking over designs required order better control fisheries.