Northwest Fisheries Science Center

Display All Information

Document Type: Journal Article
Center: NWFSC
Document ID: 884
Title: The effect of a supplementation program on the genetic and life history characteristics of an Oncorhynchus mykiss population
Author: Donald M. Van Doornik, B. A. Berejikian, Lance A. Campbell, E. C. Volk
Publication Year: 2010
Journal: Canadian Journal of Fisheries and Aquatic Sciences
Volume: 67
Issue: 9
Pages: 1449-1458

Conservation hatcheries, which supplement natural populations by removing adults or embryos from the natural environment and rearing and releasing parr, smolts, or adults back into their natal or ancestral streams, are increasingly being used to avoid extinction of localized populations of Pacific salmonids. We collected data before and during a steelhead (Oncorhynchus mykiss) supplementation program to investigate the effect that the program has had on the populations genetic diversity and effective population size and any changes to an important life history trait (residency or anadromy). We found that supplementation did not cause substantial changes in the genetic diversity or effective size of the population, most likely because a large proportion of all of the steelhead redds in the river each year were sampled to create the supplementation broodstock. Our data also showed that the captively reared fish released as adults successfully produced parr. Furthermore, we found that during supplementation, there was an increase in the proportion of O. mykiss with anadromous ancestry vs. resident ancestry.

URL1: The next link will exit from NWFSC web site
Notes: doi: 10.1139/F10-073