Ifremer, RDT Research and Technological Development, 29280, Plouzané, France.
Institut Agro, IFREMER, INRAE, DECOD, 56325, Lorient, France.
Sci Rep. 2024 Jul 4;14(1):15450. doi: 10.1038/s41598-024-66474-3.
Ghost fishing is a global issue that can be addressed using fishing gear materials that do not persist in the marine environment. However, for these alternatives to be widely adopted, they must meet the same mechanical specifications as current commercial materials while degrading without any negative impact. The objective of this study was to compare a conventional gillnet made of polyamide 6 (PA6) with an alternative made of poly(butylene succinate-co-adipate-co-terephthalate) (PBSAT) at three different scales: monofilament, knot, and net. While the PBSAT monofilament's strength was half that of the conventional PA6 net, knot and net losses were even more significant. This indicates a greater sensitivity of the material to the knot. Since the results between the knot and net scales were coherent, testing whole net panels is not necessary. Studying the curvature and the behaviour of the knot revealed its complex geometry and mechanical behaviour. Testing the weaver's knot is a good indicator for studying the relevance of an alternative to conventional fishing gear materials. This should be considered when developing biodegradable nets in order to reduce ghost fishing at sea.
海漂渔业是一个全球性问题，可以通过使用不会在海洋环境中持久存在的渔具材料来解决。然而，为了广泛采用这些替代品，它们必须满足与当前商业材料相同的机械规格，同时在降解时不会产生任何负面影响。本研究的目的是在三个不同的尺度上比较由聚酰胺 6（PA6）制成的传统刺网和由聚丁二酸丁二醇酯-共-己二酸丁二醇酯-共对苯二甲酸酯（PBSAT）制成的替代刺网：单丝、结节和网。虽然 PBSAT 单丝的强度只有传统 PA6 网的一半，但结节和网的损失甚至更大。这表明材料对结节的敏感性更大。由于结节和网尺度之间的结果是一致的，因此不需要测试整个网板。研究结节的曲率和行为揭示了其复杂的几何形状和机械行为。测试织工结是研究替代传统渔具材料相关性的一个很好的指标。在开发可生物降解的网时应考虑这一点，以减少海上的海漂渔业。
