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<p>In the U.S. West Coast Pacific halibut (<i>Hippoglossus stenolepis</i>) longline fishery, bycatch of yelloweye rockfish (<i>Sebastes ruberrimus</i>) and Pacific spiny dogfish (<i>Squalis suckleyi</i>) is a concern. Therefore, we evaluated how conventional 16/0 size circle hooks and hooks modified with stiff wire appendages extending from their shank at either a 22° or 45<sup>o</sup> angle in relation to the hooks’ offset and non-offset sides affect the catch efficiency of Pacific halibut, yelloweye rockfish, and Pacific spiny dogfish. We also estimated hooking location probabilities and examined species’ time of capture. Results demonstrated that hook appendages have the potential to reduce yelloweye rockfish and Pacific spiny dogfish bycatch without compromising the catch efficiency of the target species. Specifically, hooks with a 45° appendage on the non-offset side caught significantly fewer rockfishes (<i>Sebastes</i> spp.), and sublegal-sized Pacific halibut without significantly impacting catches of legal-sized halibut. Each appendage hook design caught significantly fewer Pacific spiny dogfish than the control hook. Fish caught on appendage hooks, in general, had statistically similar hooking location rates to what was observed in the conventional 16/0 circle hook, suggesting similar hooking injuries across hook types. Time of capture did not differ significantly between species. However, the mean time of capture was less than 80&#xa0;min for all species of interest and 90% of all captures on a hook timer rigged gangion occurred within three hours of the gear being deployed.</p>

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Hook modification to reduce rockfish and Pacific spiny dogfish bycatch in the U.S. West Coast Pacific halibut longline fishery

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Dylan S. Heppell,
  • Mark J. M. Lomeli,
  • W. Waldo Wakefield,
  • Bent Herrmann,
  • Claude L. Dykstra,
  • Ian J. Stewart

摘要

In the U.S. West Coast Pacific halibut (Hippoglossus stenolepis) longline fishery, bycatch of yelloweye rockfish (Sebastes ruberrimus) and Pacific spiny dogfish (Squalis suckleyi) is a concern. Therefore, we evaluated how conventional 16/0 size circle hooks and hooks modified with stiff wire appendages extending from their shank at either a 22° or 45o angle in relation to the hooks’ offset and non-offset sides affect the catch efficiency of Pacific halibut, yelloweye rockfish, and Pacific spiny dogfish. We also estimated hooking location probabilities and examined species’ time of capture. Results demonstrated that hook appendages have the potential to reduce yelloweye rockfish and Pacific spiny dogfish bycatch without compromising the catch efficiency of the target species. Specifically, hooks with a 45° appendage on the non-offset side caught significantly fewer rockfishes (Sebastes spp.), and sublegal-sized Pacific halibut without significantly impacting catches of legal-sized halibut. Each appendage hook design caught significantly fewer Pacific spiny dogfish than the control hook. Fish caught on appendage hooks, in general, had statistically similar hooking location rates to what was observed in the conventional 16/0 circle hook, suggesting similar hooking injuries across hook types. Time of capture did not differ significantly between species. However, the mean time of capture was less than 80 min for all species of interest and 90% of all captures on a hook timer rigged gangion occurred within three hours of the gear being deployed.