Acclimation Enhances Postrelease Performance of Hatchery Fall Chinook Salmon Subyearlings While Reducing the Potential for Interaction with Natural Fish

Autor: Steven G. Smith, William P. Connor, Christopher A. Peery, Deborah J. Milks, Mark L. Schuck, Stuart J. Rosenberger, Jay A. Hesse
Rok vydání: 2013
Předmět:
Zdroj: North American Journal of Fisheries Management. 33:519-528
ISSN: 1548-8675
0275-5947
DOI: 10.1080/02755947.2013.768567
Popis: One form of prerelease acclimation of hatchery anadromous salmonid Oncorhynchus spp. juveniles is to truck the fish to remote points for extended holding at low densities in rearing vessels (e.g., tanks, raceways, or in-ground ponds) supplied with river water. We conducted a 3-year study to determine whether such acclimation enhanced the postrelease performance of hatchery fall Chinook Salmon O. tshawytscha subyearlings and reduced the potential for interaction with natural fall Chinook Salmon subyearlings. In comparison with hatchery subyearlings that were released directly into the lower Snake River just downstream of the acclimation facility, acclimated hatchery subyearlings (1) passed downstream to Lower Monumental Dam (the third dam encountered during seaward migration) faster, (2) passed the dam earlier, and (3) survived from release to the dam tailrace at higher rates. The differences in downstream passage rate and dam passage timing were also much greater between acclimated hatchery subye...
Databáze: OpenAIRE
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