Cerbule Kristine, Herrmann Bent, Grimaldo Eduardo, Larsen Roger B, Savina Esther, Vollstad Jørgen
UiT The Arctic University of Norway, Tromsø, Norway.
UiT The Arctic University of Norway, Tromsø, Norway; SINTEF Ocean, Trondheim, Norway; DTU Aqua, Technical University of Denmark, Hirtshals, Denmark.
Mar Pollut Bull. 2022 May;178:113618. doi: 10.1016/j.marpolbul.2022.113618. Epub 2022 Apr 1.
Modern gillnets are usually made of nylon with high breaking strength, suitable elasticity and durability making them an efficient fishing gear. Lost, abandoned, or discarded gillnets at sea cause plastic pollution and can continue capturing marine animals over long periods of time. Biodegradable materials are being developed to replace nylon in gillnets. However, biodegradable gillnets have shown reduced catch efficiency compared to the nylon gillnets which challenges their acceptance by the fishing sector. This study investigated catch efficiency and modes of capture between biodegradable and nylon gillnets in commercial cod (Gadus morhua) fishery. On average, new biodegradable gillnets caught 25% fewer cod compared to new nylon gillnets. The main capture modes were by the gills and by the body in used and new biodegradable gillnets, respectively. Differences in catch efficiency are related to specific modes of capture that may be related to differences in material properties.
现代刺网通常由尼龙制成，具有高断裂强度、合适的弹性和耐用性，使其成为一种高效的捕鱼工具。在海上丢失、遗弃或丢弃的刺网会造成塑料污染，并可能长时间持续捕获海洋动物。正在开发可生物降解材料来替代刺网中的尼龙。然而，与尼龙刺网相比，可生物降解刺网的捕捞效率有所降低，这对渔业部门接受它们构成了挑战。本研究调查了商业鳕鱼（大西洋鳕）渔业中可生物降解刺网和尼龙刺网之间的捕捞效率和捕获方式。平均而言，新的可生物降解刺网捕获的鳕鱼比新的尼龙刺网少25%。在使用过的和新的可生物降解刺网中，主要捕获方式分别是通过鳃和通过身体。捕捞效率的差异与特定的捕获方式有关，而这些方式可能与材料特性的差异有关。
