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.
Citation Information
| Publication Year | 2023 |
|---|---|
| Title | Validating a non-lethal method of aging endangered juvenile Lost River and Shortnose Suckers |
| DOI | 10.3996/JFWM-22-039 |
| Authors | Barbara A. Martin, Summer M. Burdick, Rachael Katelyn Paul-Wilson, Ryan J Bart |
| Publication Type | Article |
| Publication Subtype | Journal Article |
| Series Title | Journal of Fish and Wildlife Management |
| Index ID | 70239409 |
| Record Source | USGS Publications Warehouse |
| USGS Organization | Western Fisheries Research Center |
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Marginal increment and age data from fin rays of endangered suckers
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- Data
Marginal increment and age data from fin rays of endangered suckers
Data included in this data set are from suckers collected in Hagelstein Pond from 2014 through 2021. Data were collected on age, marginal increment, and marginal increment ratios from fin rays, and length of suckers captured during monthly sampling events. There are two levels of data. Fin ray data contains 409 records and the data file is 31 KB, repeat data contains 58 records and the data file i - Connect