Fishing with circle hooks along with prescribed hook-setting methods can reduce deep-hooking rates in some fisheries, but baited circle hooks have not been evaluated in stillwater trout fisheries. Deep-hooking rates and catch probabilities were compared for cutthroat trout Oncorhynchus clarkii​ (Richardson), rainbow trout Oncorhyncus mykiss (Walbaum), cutthroat × rainbow trout hybrids, and brook trout Salvelinus fontinalis (MItchill) caught using three types of baited hooks (circle, intermediate circle and traditional J) and two hook-setting methods (active and passive) in several lakes containing naturally reared trout. Hook type had a negligible effect on deep-hooking rates, which averaged 20%. Actively setting the hook and fishing with a bobber both reduced deep-hooking rates, regardless of hook type. Larger fish were deeply hooked more frequently regardless of hook type. Catch probabilities were higher when active rather than passive hook-setting was used, particularly in combination with intermediate circle hooks. The present results, which indicate that circle hook use did not reduce deep hooking in lentic settings, contrast earlier studies done in lotic waters. Therefore, before proposing hook-type regulations intended to reduce deep hooking, fisheries managers should consider waterbody type in addition to fishing methods, fish size and species.

中文翻译：

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浅水区钓鳟鱼钩型和挂钩方式对深钩率的影响

在某些渔业中，使用圆钩和规定的挂钩方法捕鱼可以降低深钩率，但尚未对静水鳟鱼渔业中的诱饵圆钩进行评估。深挂钩利率和捕捉概率山鳟比较钩吻氏原螯虾（理查德森），虹鳟鱼Oncorhyncus虹鳟（大麻哈鱼），杀手×虹鳟鱼混合动力车，以及溪红点鲑溪红点鲑(Mitchill) 在包含自然养殖鳟鱼的几个湖泊中使用三种类型的诱饵钩（圆形、中间圆形和传统 J）和两种设置钩方法（主动和被动）捕获。钩型对深钩率的影响可以忽略不计，平均为 20%。无论鱼钩类型如何，主动设置鱼钩和用浮子钓鱼都可以降低深钩率。无论钩子类型如何，较大的鱼都更频繁地被深深地钩住。当使用主动而不是被动的钩子设置时，捕获概率更高，特别是与中间圆形钩子结合使用时。目前的结果表明，圆钩的使用并没有减少 lentic 环境中的深钩，这与早期在流水中进行的研究形成对比。因此，在提出旨在减少深钩的钩型规定之前，