Comparison of triploid and diploid rainbow trout (Oncorhynchus mykiss) fine-scale movement, migration and catchability in lowland lakes of western Washington

Abstract Fisheries managers stock triploid (i.e., infertile, artificially produced) rainbow trout Oncorhynchus mykiss in North American lakes to support sport fisheries while minimizing the risk of genetic introgression between hatchery and wild trout. In Washington State, the Washington Department...

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Bibliographic Details
Published in:	Movement ecology Vol. 11; no. 1; pp. 1 - 13
Main Authors:	Pease, Jessica E., Losee, James P., Caromile, Stephen, Madel, Gabriel, Lucero, Michael, Kagley, Anna, Bertram, Michael G., Martin, Jake M., Quinn, Thomas P., Palm, Daniel, Hellström, Gustav
Format:	Journal Article
Language:	English
Published:	London BioMed Central Ltd 15-09-2023 BioMed Central BMC
Subjects:	Acoustics Analysis Angler catch rates Bass Catchability Commercial fishing Creel Diploids Distribution patterns Emigration Emigration and immigration Endangered & extinct species Endangered species Fish and Aquacultural Science Fish hatcheries Fisheries Fisheries management Fishes Fishing Fisk- och akvakulturforskning Hatcheries Home range Introgression Lakes Oncorhynchus mykiss Oxytetracycline Risk reduction Rivers Salmon Stocking Telemetry Trout Wildlife Wildlife conservation Wildlife management Canada United States > US Ward Lake Idaho
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Summary:	Abstract Fisheries managers stock triploid (i.e., infertile, artificially produced) rainbow trout Oncorhynchus mykiss in North American lakes to support sport fisheries while minimizing the risk of genetic introgression between hatchery and wild trout. In Washington State, the Washington Department of Fish and Wildlife (WDFW) allocates approximately US $3 million annually to stock hatchery-origin rainbow trout in > 600 lakes, yet only about 10% of them are triploids. Many lakes in Washington State drain into waters that support wild anadromous steelhead O. mykiss that are listed as threatened under the U.S. Endangered Species Act. As a result, there is a strong interest in understanding the costs and benefits associated with stocking sterile, triploid rainbow trout as an alternative to traditional diploids. The objectives of this study were to compare triploid and diploid rainbow trout in terms of: (1) contribution to the sport fishery catch, (2) fine-scale movements within the study lakes, (3) rate of emigration from the lake, and (4) natural mortality. Our results demonstrated that triploid and diploid trout had similar day-night distribution patterns, but triploid trout exhibited a lower emigration rate from the lake and lower catch rates in some lakes. Overall, triploid rainbow trout represent a viable alternative to stocking of diploids, especially in lakes draining to rivers, because they are sterile, have comparable home ranges, and less often migrate.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2051-3933 2051-3933
DOI:	10.1186/s40462-023-00418-w