RESEARCH NOTE Robert A. Leidy* University of California, Berkeley, Department of Environmental Science, Policy & Management, Berkeley, CA 94720, USA https://orcid.org/0000-0003-3410-2737 *Corresponding Author: raleidy@berkeley.edu Published 22 May 2026 • doi.org/10.51492/cfwj.112.2 Key words: extinct thicktail chub, Gila crassicauda, Lernaea cyprinacea, non-native parasitic copepod, Sacramento-San Joaquin Delta Citation: Leidy, R. A. 2026. Documentation of a non-native anchor … Continue reading Documentation of a non-native anchor worm on the extinct thicktail chub, Sacramento-San Joaquin River Delta, California