Can a large-mesh sieve panel replace or supplement the Nordmore grid for bycatch mitigation in the northeast Atlantic deep-water shrimp fishery?

• Published in: Fisheries Research
• Main Authors: Jacques, Nadine, Herrmann, Bent, Larsen, Roger B., Sistiaga, Manu, Brcic, Jure, Gokce, Gokhan, Brinkhof, Jesse
• Other Authors: Çukurova Üniversitesi
• Format: Article in Journal/Newspaper
• Language: English
• Published: ELSEVIER 2019
• Subjects: Shrimp fishery; Bycatch reduction; Nordmore grid; Sieve panel; Arctic; Gyda; Hanssen; Norway; Tromso; Boreogadus saida; Northeast Atlantic; polar cod; Arctic University of Norway; UiT The Arctic University of Norway
• Online Access: https://hdl.handle.net/20.500.12605/8889; https://doi.org/10.1016/j.fishres.2019.105324

WOS: 000488300900026 The Nordmore grid is the principle bycatch mitigation device in many shrimp trawl fisheries. However, in several of these fisheries, bycatch is a problem because small sized fish can pass through the grid and enter the codend together with the targeted shrimp. One such fishery is the Northeast Atlantic deep-water shrimp (Pcmdalus borealis) fishery, where the use of a Nordmore grid is mandatory. In this fishery, redfish (Sebastes spp.) and polar cod (Boreogadus saida) are two common bycatch species. Redfish is a commercially important species that at times is captured in great numbers, whereas polar cod is a threatened species that can also be caught in high numbers. Sieve panels are bycatch reduction devices commonly used in shrimp fisheries and their potential to replace or supplement the Nordmore grid in the Northeast Atlantic deep-water shrimp fishery is of interest. We investigated the size selectivity of redfish, polar cod and deep-water shrimp for the Nordmare grid and four sieve panel configurations differing in mesh size (182 and 286 mm) and inclination angle (10 and 20 degrees). The sieve panels were unable to replace the Nordmore grid as a stand-alone device due to greater catches of the bycatch species. However, combining the two devices provided promising results. Specifically, when a large-mesh sieve panel was placed in front of the Nordmore grid, 20-40% fewer small redfish and polar cod in a specific size range entered the codend, while the loss of targeted shrimp was less than 5%. UiT, The Arctic University of Norway in Tromso; Norwegian Seafood Research Fund [901303] We thank the crew of RV "Helmer Hanssen" and assistants Ivan Tatone, Ilmar Brinkhof, Hermann Pettersen, Maria Alquiza Madina and Gyda Christophersen for valuable assistance on board. We are grateful to UiT, The Arctic University of Norway in Tromso and the Norwegian Seafood Research Fund (grant 901303) for funding the experiments carried out in this study. Finally, we thank the editor and the two anonymous ...