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<p>To address the operational challenges associated with retrieving abandoned, lost, or otherwise discarded fishing gear (ALDFG), this study employed a mixed orthogonal experiment to systematically evaluate the effects of seabed quality, grapnel configuration, dragging speed, and netting parameters on retrieval efficiency. The experiment was conducted in a controlled tank environment. The results showed no statistically significant difference in retrieval efficiency between the single-grapnel and double-grapnel configurations. The rocky and mixed mud-sand-rock seabeds exhibited significantly lower efficiency compared to mud, sand, and mud-sand seabeds. The small sharp grapnel achieved the highest retrieval efficiency, significantly outperforming other grapnel configurations. Within the 0.10–0.25 m/s range, dragging speed had a limited effect on retrieval efficiency. Larger netting sizes and mesh sizes were positively correlated with retrieval success rates. This study clarifies the compatibility mechanisms between seabed quality and retrieval configuration, offering a quantitative basis for optimizing grapnel-based ALDFG retrieval systems, particularly for heterogeneous seabed, and providing a technical framework for mitigating ALDFG pollution.</p>

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Performance of ALDFG Retrieval Apparatus in Tank Simulation Experiment

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Bo Zhang,
  • Liming Song,
  • Haiwei Yang,
  • Yuwei Li

摘要

To address the operational challenges associated with retrieving abandoned, lost, or otherwise discarded fishing gear (ALDFG), this study employed a mixed orthogonal experiment to systematically evaluate the effects of seabed quality, grapnel configuration, dragging speed, and netting parameters on retrieval efficiency. The experiment was conducted in a controlled tank environment. The results showed no statistically significant difference in retrieval efficiency between the single-grapnel and double-grapnel configurations. The rocky and mixed mud-sand-rock seabeds exhibited significantly lower efficiency compared to mud, sand, and mud-sand seabeds. The small sharp grapnel achieved the highest retrieval efficiency, significantly outperforming other grapnel configurations. Within the 0.10–0.25 m/s range, dragging speed had a limited effect on retrieval efficiency. Larger netting sizes and mesh sizes were positively correlated with retrieval success rates. This study clarifies the compatibility mechanisms between seabed quality and retrieval configuration, offering a quantitative basis for optimizing grapnel-based ALDFG retrieval systems, particularly for heterogeneous seabed, and providing a technical framework for mitigating ALDFG pollution.