Setlines and trotlines are useful tools for sampling catfish populations. These gears offer an alternative to sampling in habitats or conditions that are unsuitable for traditional sampling gears, and they may be capable of sampling a different subset of the population. However, little is known about their efficacy as catfish sampling gear. We developed a standardized method for deploying setlines in the form of bank poles and assessed the catch rate, species composition, and efficacy of bank poles in the Kansas River, Kansas. We also used Lindgren-Pitman hook timers to investigate temporal patterns of capture, retention rates, and optimal soak duration. Bank poles (n = 897) were equipped with 6/0 circle hooks baited with Silver Carp Hypophthalmichthys molitrix cut bait and were deployed overnight during the summers of 2018 and 2019. Bank poles captured a total of seven fish species, with 97% of the species composition being catfishes (n = 258; mean TL = 688 ± 182.7 mm; range = 392–1,310 mm). Blue Catfish Ictalurus furcatus (45%) was the most commonly captured species, followed by Channel Catfish I. punctatus (37%) and Flathead Catfish Pylodictis olivaris (15%). The success rate for hooking and landing fish with bank poles was 29%. There was no difference between total catch rates from standard bank poles and those from bank poles equipped with hook timers. Higher catch rates were observed early in the set time for Channel and Flathead catfish, whereas a relatively steady catch rate was observed for Blue Catfish. Overall, 46% of catfish were caught within 3 h of gear deployment and 72% were caught within 5 h. We recommend adopting shortened soak durations (about 5 h) to prevent bait loss and to optimize fish retention. Our study provides an alternative sampling approach to increase the catch of large individuals and offers insight into the catch dynamics and interactions of passive angling gears.

中文翻译：

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堪萨斯河两岸河岸的功效和时间捕获模式：一种新颖的Cat鱼采样工具

设定线和小跑线是采样fish鱼种群的有用工具。这些工具提供了在不适合传统采样工具的栖息地或条件下进行采样的替代方法，并且它们可能能够对另一部分种群进行采样。但是，关于它们作为cat鱼采样工具的功效知之甚少。我们开发了一种标准化方法，用于以堤岸形式部署定线，并评估了堪萨斯州堪萨斯河的堤岸捕获率，物种组成和功效。我们还使用Lindgren-Pitman挂钩计时器来调查捕获，保留率和最佳浸泡时间的时间模式。银行磁极（Ñ  = 897）装备有6/0圆钩诱饵与鲢鲢削减诱饵并在2018年和2019年夏季部署过夜。河岸竿共捕获了7种鱼类，其中97％的种类为cat鱼（n  = 258；平均TL = 688±182.7 mm；范围= 392– 1,310毫米）。蓝鲶鱼斑点叉尾furcatus（45％）是最常见的捕捞品种，其次是斑点叉尾鮰我。马尾鱼（37％）和扁平头fish鱼（Pylodictis olivaris）（15％）。用立杆钩住鱼的成功率为29％。标准堤岸与配备钩形计时器的堤岸的总捕获率之间没有差异。在设定时间内，河道and鱼和fish鱼的捕获率较高，而蓝Cat鱼的捕获率则相对稳定。总体而言，在部署渔具的3小时内捕获了46％的cat鱼，在5 h内捕获了72％的cat鱼。我们建议采用较短的浸泡时间（约5小时），以防止饵料流失并优化鱼的滞留性。我们的研究提供了另一种采样方法来增加大型个体的捕获量，并深入了解捕获动态和被动式渔具的相互作用。