被困两次:发现海洋盆地塑料碎片对拖网捕获的小生物的影响
Saranya Raju1, Yoshiki Matsushita2
1Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan.
Marine pollution bulletin
|May 16, 2025
概括
海洋盆地碎片,主要是塑料,显著增加了沿海拖网渔业的副捕获. 这些碎片通过捕捉较小的生物来对鱼的选择性产生不利影响,从而影响渔业管理.
科学领域:
- 海洋生物学 海洋生物学
- 渔业 科学 渔业 科学
- 环境科学 环境科学
背景情况:
- 海洋底层垃圾,特别是塑料,对海洋生态系统构成越来越大的威胁.
- 拖网渔业容易捕获非目标物种 (副捕获) 和碎片.
研究的目的:
- 为了量化日本沿海拖网渔业中的海洋底层垃圾.
- 评估碎片对副捕捞和鱼选择性的影响.
主要方法:
- 在塔奇巴纳湾 (2023-2024) 收集和分析两艘梁鱼船的海洋垃圾和相关生物.
- 使用带有塑料袋和没有塑料袋的尾进行了选择性实验.
- 应用后勤和接触概率模型来估计密码的选择性.
主要成果:
- 收集了1249个碎片 (45.04公斤),其中塑料占数量和重量的94%以上.
- 发现来自23种物种的250种生物被困在塑料碎片中,显示出与副捕获的强烈正相关性 (r=0.71).
- 带有塑料袋的网络对较小的鱼类具有更高的保留概率,这表明选择性发生了改变.
结论:
- 海洋盆地塑料垃圾对沿海拖网渔业的副捕获有很大贡献.
- 碎片通过捕捉较小的生物来对拖网的选择性产生不利影响.
- 调查结果强调了在渔业中需要废料减排战略的必要性.
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