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.
Understanding movement and dispersal dynamics of mobile, large-river fishes is essential to adopting an ecologically relevant spatial scale for research and management. Movement and dispersal patterns of Blue CatfishIctalurus furcatus, a large-river specialist, have been mostly investigated in large river systems within their native range, with little emphasis on tributaries and the influence of connectivity. Here, we examine longitudinal movement patterns, natal environments, and population demographics of Blue Catfish in a tributary system of a large Great Plains river. Blue Catfish tagged in the Kansas River were recaptured in five different rivers of varying size and order, and individual movement was highly variable (0-475 rkm). Adult fish (>400 mm) collected within segments (i.e., Segment 1 and 2) of the Kansas River with connectivity to the Missouri River displayed relatively equal natal contributions from the Kansas River (34-48%) and Missouri River (38-65%) while disconnected river segments contained a high percentage (64-87%) of individuals that originated from reservoirs located on tributaries to the Kansas River. The Kansas River segments (Segment 1 and 2) connected with the Missouri River had lower instantaneous mortality (Z = 0.19, SE = 0.05) and higher proportions of large fish (PSD-M = 9 & 11, PSD-T = 3 & 5, respectively) compared to disconnected reaches (Z = 0.27, SE = 0.08; PSD-M = 3, PSD-T = 0). Mean length of Blue Catfish collected in disconnected reaches were greater than those from connected reaches for individuals at age-3 and age-6, and relatively equal at age-10. Our data provide additional resolution to movement and dispersal patterns of Blue Catfish within large-river tributary systems, highlight the role of localized reservoir stock contributions, and illustrate species plasticity across varying levels of river network connectivity.
Silver Carp Hypophthalmichthys molitrix have expanded their range to encompass most of the Mississippi River basin, including much of the Missouri River. However, there is a paucity of information concerning Silver Carp in the Missouri River basin, especially in tributaries. Little is known about how Silver Carp function in these tributaries or how connectivity with a main‐stem river can influence population demographics within either system. The Kansas River is a tributary to the Missouri River and has multiple physical anthropogenic barriers creating varying levels of connectivity within the system, as well as with the Missouri River. These varying levels of connectivity, or lack thereof, provide a unique opportunity to examine population demographics in river segments separated by barriers. We collected Silver Carp from upstream and downstream of the first two barriers on the Kansas River in the summers of 2018 and 2019. No Silver Carp were captured upstream of a hydropower dam at river kilometer 84 but were found upstream of a water diversion weir at river kilometer 24. Catch rates of adult Silver Carp were lower in the reach above the weir, but Silver Carp caught in this reach exhibited greater growth rates than Silver Carp captured below the weir. Catch rates of juveniles were also lower in the reach above the weir. Limited connectivity within the Kansas River via the water diversion weir could influence size structure and catch rates of Silver Carp captured above and below the weir. Lack of juveniles above the weir indicates that reproduction may be limited in this reach, and river conditions below the weir may be more suitable for rearing juvenile Silver Carp. This information is important for understanding Silver Carp population demographics across a range of river environments, providing critical information for the development and implementation of broadscale control plans.
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