Validating a Nonlethal Method of Aging Endangered Juvenile Lost River and Shortnose Suckers

Author:

Martin Barbara A.1,Burdick Summer M.1,Paul-Wilson Rachael K.1,Bart Ryan J.1

Affiliation:

1. U.S. Geological Survey, Western Fisheries Research Center, Klamath Falls Field Station, 2795 Anderson Avenue, Suite 106, Klamath Falls, Oregon 97603Present address of S.M. Burdick: U.S. Geological Survey, Western Fisheries Research Center, Columbia River Research Laboratory, 5501A Cook-Underwood Road, Cook, Washington 98605Present address of R.J. Bart: U.S. Fish and Wildlife Service, IFWO-Coeur d'Alene, 3232 W. Nursery Road, Coeur d'Alene, Idaho 83815

Abstract

Abstract Populations of imperiled Lost River Deltistes luxatus and Shortnose Chasmistes brevirostris suckers in Upper Klamath Lake, Oregon, are experiencing long-term decreases in abundance due to limited recruitment of juvenile suckers into the adult populations. Researchers use estimated ages based on fin rays to study environmental factors affecting year-class formation, generate annual juvenile sucker survival indices, and study variations in early life history. Biased or imprecise age estimates can lead to erroneous conclusions and have implications for age-based survival estimates, indications of recruitment, and growth estimators. We examined fin rays collected from individual suckers captured on multiple occasions and determined that juvenile suckers deposit a translucent increment on fin rays annually. Size-at-age data for suckers first captured as young as age 0 corroborated our finding of annual increment formation and indicate that the first increments are formed at age 1. We used edge and marginal increment analysis conducted on fin rays to determine the timing of annual increment formation. Our results indicate that increment formation occurs on fin rays of juvenile suckers from October to May and peaks between February and April.

Publisher

U.S. Fish and Wildlife Service

Subject

Nature and Landscape Conservation,Animal Science and Zoology,Ecology,Ecology, Evolution, Behavior and Systematics

Reference47 articles.

1. Andreasen JK . 1975. Systematics and status of the family Catostomide in Southern Oregon. PhD thesis. Corvallis: Oregon State University.

2. Bart RJ , BurdickSM, HoyMS, OstbergCO. 2020 a. Juvenile Lost River and Shortnose sucker year-class formation, survival, and growth in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2017 monitoring report. Reston, Virginia: U.S. Geological Survey Open-File Report 2020-1025. Available: https://pubs.er.usgs.gov/publication/ofr20201025 (April 2022; see Supplemental Material, Reference S1)

3. Bart RJ , BurdickSM, HoyMS, OstbergCO. 2020 b. Juvenile Lost River and Shortnose sucker year-class formation, survival, and growth in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2018 monitoring report. Reston, Virginia: U.S. Geological Survey Open-File Report 2020-1064. Available: https://pubs.er.usgs.gov/publication/ofr20201064 (April 2022; see Supplemental Material, Reference S2)

4. Bart RJ , KelseyCM, BurdickSM, HoyMS, OstbergCO. 2021. Growth, survival, and cohort formation of juvenile Lost River (Deltistes luxatus) and Shortnose suckers (Chasmistes brevirostris) in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2019 monitoring report. Reston, Virginia: U.S. Geological Survey Open-File Report 2021-1119. Available: https://pubs.er.usgs.gov/publication/ofr20211119 (April 2022; see Supplemental Material, Reference S3).

5. Beamish RJ , McFarlaneGA. 1983. The forgotten requirement for age validation in fisheries biology. Transactions of the American Fisheries Society131:735–743.

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