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<p>Small-scale fisheries (SSFs) provide essential food and income for coastal communities but continue to face challenges from high bycatch. In Thailand, trammel nets targeting <i>Penaeus</i> spp. generate substantial discards of benthic invertebrates, increasing discard rates, damaging gear, and adding labor costs. This study evaluated the performance of a bottom-guarding net in the Ban Nam Khem small-scale trammel net fishery. Fifteen fishing operations conducted between October and December 2024 compared conventional trammel nets (CN) with modified trammel nets (MN). Across all hauls, 114 species, 4055 individuals, and 354.24&#xa0;kg of catch were recorded. Catch per unit effort (CPUE), analyzed using the Wilcoxon–Mann–Whitney test, showed no significant differences in target prawn yields between CN and MN (<i>p</i> &gt; 0.05). In contrast, the abundance and biomass of discarded species in MN were significantly reduced by 73.2% and 74.4%, respectively. Multivariate analyses (ANOSIM, MDS, SIMPER) revealed marked shifts in catch composition, driven largely by &gt; 90% reductions in <i>Murex</i> spp., the dominant discarded species. However, MN also yielded significantly lower abundance and biomass of commercial bycatch species compared with CN (<i>p</i> &lt; 0.05). Overall, this study demonstrates that guarding nets can improve trammel net selectivity by reducing bycatch, offering valuable insights for sustainable management and technological innovation in Thailand’s SSFs.</p>

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Effectiveness of bottom guarding nets in reducing bycatch in prawn (Penaeus spp.) trammel net fishery along the coast of Ban Nam Khem, Phang-Nga, Thailand

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Phatcharapol Boonserm,
  • Keigo Ebata,
  • Napakhwan Whanpetch,
  • Tanuspong Pokavanich,
  • Thanakorn Sangeamwong,
  • Wachirah Jaingam

摘要

Small-scale fisheries (SSFs) provide essential food and income for coastal communities but continue to face challenges from high bycatch. In Thailand, trammel nets targeting Penaeus spp. generate substantial discards of benthic invertebrates, increasing discard rates, damaging gear, and adding labor costs. This study evaluated the performance of a bottom-guarding net in the Ban Nam Khem small-scale trammel net fishery. Fifteen fishing operations conducted between October and December 2024 compared conventional trammel nets (CN) with modified trammel nets (MN). Across all hauls, 114 species, 4055 individuals, and 354.24 kg of catch were recorded. Catch per unit effort (CPUE), analyzed using the Wilcoxon–Mann–Whitney test, showed no significant differences in target prawn yields between CN and MN (p > 0.05). In contrast, the abundance and biomass of discarded species in MN were significantly reduced by 73.2% and 74.4%, respectively. Multivariate analyses (ANOSIM, MDS, SIMPER) revealed marked shifts in catch composition, driven largely by > 90% reductions in Murex spp., the dominant discarded species. However, MN also yielded significantly lower abundance and biomass of commercial bycatch species compared with CN (p < 0.05). Overall, this study demonstrates that guarding nets can improve trammel net selectivity by reducing bycatch, offering valuable insights for sustainable management and technological innovation in Thailand’s SSFs.