Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 9164
Title: Increased natural reproduction and genetic diversity one generation after cessation of a steelhead trout (Oncorhynchus mykiss) conservation hatchery program
Author: B. A. Berejikian, Donald M. Van Doornik
Publication Year: 2018
Journal: PLoS ONE
DOI: https://doi.org/10.1371/journal.pone.0190799
Abstract:

Spatial and temporal fluctuations in productivity and abundance confound assessments of captive propagation programs aimed at recovery of Threatened and Endangered populations.  We conducted a 17 year before-after-control-impact experiment to determine the effects of a captive rearing program for anadromous steelhead trout (Oncorhynchus mykiss) on a key indicator of natural spawner abundance (naturally produced nests or ¿redds¿). The supplemented population exhibited a significant (2.6-fold) increase in redd abundance in the generation following supplementation compared to four control (non-supplemented) populations.  Expected heterozygosity increased significantly, and allelic richness increased, but to a lesser (non-significant) degree.  Effective population size estimates increased from 24.4 before supplementation to 38.9 after supplementation. Several non-conventional aspects of the captive rearing program may have contributed to the positive response in the natural population.

Description:

Before-after-control impact evaluation of a conservation hatchery program for steelhead trout.

Theme: Recovery and rebuilding of marine and coastal species
Foci: Evaluate the effects of artificial propagation on recovery, rebuilding and sustainability of marine and anadromous species.
Official Citation:

Berejikian BA, Van Doornik DM (2018) Increased natural reproduction and genetic diversity one generation after cessation of a steelhead trout (Oncorhynchus mykiss) conservation hatchery program. PLoS ONE 13(1): e0190799. https://doi.org/10.1371/journal. pone.0190799