Abstract Objective Walleye Sander vitreus is an important species that has been widely introduced outside of its native distribution. The goal of this study was to assess the effects of an established Walleye population in the Lake Pend Oreille (LPO) system, Idaho. Methods Food habits of Walleyes were described using stomach contents and stable isotopes (δ 15 N, δ 13 C). Trophic structure of the LPO system's food web was identified using stable isotopes. Annual consumption by Walleyes of important prey items was estimated using a bioenergetics model. Result Walleyes consumed a diversity of prey items, including macroinvertebrates and fishes. Kokanee Oncorhynchus nerka , the most frequently consumed prey item, occurred in 23% of all Walleye diets. Combined, native cyprinids and catostomids occurred in 31% of all Walleye stomachs. Select taxa (e.g., native cyprinids, kokanee) were consistently consumed by Walleyes across seasons, regions, and cohorts, whereas other taxa (e.g., Westslope Cutthroat Trout O. lewisi , Smallmouth Bass Micropterus dolomieu ) were consumed inconsistently. Stable isotope analysis suggested that Walleyes occupied similar trophic positions as other top‐level piscivores in the system . As Walleye age increased, δ 15 N increased and δ 13 C decreased, indicating increased consumption of pelagic prey resources and prey at higher trophic positions. The estimated biomass of kokanee consumed annually by Walleyes was 27,121 kg (95% confidence interval = 9178–61,603). Comparatively, native cyprinids represented about 46% of the total biomass of kokanee consumed by Walleyes, whereas native catostomids represented about 11% and native salmonids represented about 15% of the total biomass of kokanee consumed by Walleyes. Conclusion This study revealed that Walleyes consumed various fishes across the LPO system. Although kokanee were the most frequently consumed prey item, native cyprinids and catostomids (combined) occurred at similar proportions. This study contributes to our growing knowledge of the effects of nonnative Walleyes on important salmonids and native fishes in western systems.

Susan E. Frawley

Matthew P. Corsi

Andrew M. Dux

Ryan S. Hardy

Michael C. Quist

North American Journal of Fisheries Management

《北美渔业管理杂志》促进渔业管理者之间的交流，重点关注北美，并解决渔业资源的维护、增强和分配问题。它记录了海洋和淡水环境中鱼类和可开发贝类的实用监测和管理计划的发展。贡献与鱼类种群、栖息地和用户的管理有关，以保护和增强鱼类和渔业资源，以造福社会。渔业计划的成功、失败和影响的案例有助于向他人传达实际的管理经验。

The North American Journal of Fisheries Management aims to facilitate communication among fishery managers, with a particular focus on North America, addressing issues related to the conservation, enhancement, and allocation of fishery resources. It documents the development of practical monitoring and management plans for fish and exploitable shellfish in marine and freshwater environments. Contributions relate to the management of fish populations, habitats, and users, with the goal of protecting and enhancing fish and fishery resources for the benefit of society. Case studies of successful and unsuccessful fishery programs provide valuable practical management experiences for others.

《北美渔业管理杂志》旨在促进渔业管理者之间的交流，特别关注北美地区，解决渔业资源的保护、增殖和分配问题。该杂志记录了海洋和淡水环境中鱼类及可开发贝类的实用监测和管理计划的发展。文章内容涉及鱼类种群、栖息地及其用户的管理，旨在保护和增强鱼类及渔业资源，以造福社会。成功与失败的渔业管理案例为他人提供了宝贵的实践经验。

Category	Quartile
农林科学	4
农林科学, 渔业	4

Food habits of nonnative Walleyes in Lake Pend Oreille, Idaho

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