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Impacts of artificial rearing on cisco Coregonus artedi morphology, including pugheadedness

May 13, 2024
Cisco (Coregonus artedi Lesueur, 1818) in the Laurentian Great Lakes declined throughout the 19th and 20th centuries. Managers are attempting to restore Great Lakes cisco and other coregonines using multiple approaches, including stocking. A potential obstacle to these efforts is that artificially reared coregonines can display deformities and morphological differences compared to wild fish, but the impacts of artificial rearing on cisco morphology are not well understood. We compared morphologies of wild cisco to their artificially reared offspring, including one family that was exposed to three rearing temperature treatments. We found that artificially reared cisco had smaller eyes, shallower bodies, fewer gill rakers, and longer paired fins than their wild parents. We also found that artificially reared cisco were pugheaded, and this result held for another cisco population and rearing facility. Across the temperature treatments we tested, rearing temperatures did not impact the degree of pugheadedness or other morphological differences. Our results have important implications for coregonine restoration efforts. Future work should evaluate whether morphological differences that arise through artificial rearing affect cisco fitness in the wild.
Publication Year 2024
Title Impacts of artificial rearing on cisco Coregonus artedi morphology, including pugheadedness
DOI 10.1139/cjz-2023-0195
Authors Andrew Edgar Honsey, Katie Victoria Anweiler, David Bunnell, Cory Brant, Georgia Wende Hoffman, Brian O'Malley, Kevin Keeler, Chris Olds, Jeremy Kraus, Yu-Chun Kao, Wendylee Stott
Publication Type Article
Publication Subtype Journal Article
Series Title Canadian Journal of Zoology
Index ID 70254169
Record Source USGS Publications Warehouse
USGS Organization Great Lakes Science Center