South Australian Research and Development Institute (Aquatic Sciences), West Beach, South Australia, Australia.
New South Wales Department of Primary Industries, Fisheries Conservation Technology Unit, Coffs Harbour, New South Wales, Australia.
PLoS One. 2018 Nov 21;13(11):e0207117. doi: 10.1371/journal.pone.0207117. eCollection 2018.
Incremental refinements were made to a generic Nordmøre-grid to minimise bycatches of blue swimmer crabs Portunus armatus and giant cuttlefish Sepia apama, while maintaining catches of western king prawns Melicertus latisulcatus in the Spencer Gulf penaeid-trawl fishery. These refinements involved varying bar spaces, escape-exit areas and guiding-panel lengths, and were compared against a conventional trawl. Catches of teleosts and M. latisulcatus largely remained unaffected by the changes. Maximum reductions in P. armatus and S. apama bycatches (both ~90%) were achieved with a Nordmøre-grid comprising 38-mm bar spaces, 0.81- or 1.05-m(2) escape exits and a 2.7-m guiding panel. Catching fewer P. armatus should reduce abrasion and crushing of M. latisulcatus in the codend and so increase the value of this targeted species. While noting some unresolved operational concerns, these results demonstrate the potential improvements in selectivity in this fishery using a Nordmøre-grid, primarily by mechanical separation.
在 Spencer 湾对虾拖网渔业中，对通用 Nordmøre 网进行了渐进式改进，以尽量减少蓝蟹 Portunus armatus 和巨型乌贼 Sepia apama 的兼捕量，同时保持对西部帝王虾 Melicertus latisulcatus 的捕获量。这些改进涉及改变网条间距、逃生出口面积和导板长度，并与传统拖网进行了比较。鱼类和 M. latisulcatus 的捕获量基本上不受这些变化的影响。采用 38 毫米网条间距、0.81 或 1.05 平方米逃生出口和 2.7 米导板的 Nordmøre 网可最大程度减少 P. armatus 和 S. apama 的兼捕量（两者均约为 90%）。捕获较少的 P. armatus 应该减少在渔获物中的磨损和压碎，从而提高目标物种的价值。尽管注意到一些未解决的操作问题，但这些结果表明，在该渔业中使用 Nordmøre 网可以通过机械分离来提高选择性。
