Differential reproductive success of sympatric, naturally spawning hatchery and wild steelhead trout (Oncorhynchus mykiss) through the adult stage

We used multilocus microsatellite analysis to compare the reproductive success of naturally spawning wild steelhead trout (Oncorhynchus mykiss) with a newly established sympatric hatchery population in Forks Creek, Washington, U.S.A. Hatchery steelhead spawning in the wild had markedly lower reprodu...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2003-04, Vol.60 (4), p.433-440
Main Authors: McLean, Jennifer E, Bentzen, Paul, Quinn, Thomas P
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal populations
Animal productions
Animal reproduction
Biological and medical sciences
Breeding
Creeks
Domestication
Females
Fish
Fish conservation
Fish hatcheries
Freshwater
Freshwater environments
Fundamental and applied biological sciences. Psychology
Habitats
Offspring
Oncorhynchus mykiss
Pisciculture
Reproduction
Rivers
Salmon
Spawning
Trout
Upstream
Vertebrate aquaculture
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Summary:We used multilocus microsatellite analysis to compare the reproductive success of naturally spawning wild steelhead trout (Oncorhynchus mykiss) with a newly established sympatric hatchery population in Forks Creek, Washington, U.S.A. Hatchery steelhead spawning in the wild had markedly lower reproductive success than native wild steelhead. Wild females that spawned in 1996 produced 9 times as many adult offspring per capita as did hatchery females that spawned in the wild. Wild females that spawned in 1997 produced 42 times as many adult offspring as hatchery females. The wild steelhead population more than met replacement requirements (approximately 3.7–6.7 adult offspring were produced per female), but the hatchery steelhead were far below replacement requirements (
ISSN:0706-652X
1205-7533
DOI:10.1139/f03-040