Publication category archive for: Study
Does catch and release affect the mating system and individual reproductive success of wild Atlantic salmon?
In this study, they documented the breeding system of a wild population of Atlantic salmon by genetically sampling every returning adult and assessed the determinants of individual fitness. They then quantified the impacts of catch and release (C&R) on mating and reproductive success.
In the present report, we explore the hypothesis that hatchery-reared juveniles might exhibit morphological defects in vulnerable mechanosensory systems prior to release from the hatchery, potentiating
reduced survival after release.
ABSTRACT: Identification of population-specific run timing is an important component of salmonid fisheries management and was a major focus of our study. Population structure of steelhead Oncorhynchus mykiss was examined in the Skeena River of northern British Columbia. Variation at 14 microsatellites was surveyed in 3,062 steelhead sampled from 17 populations in the drainage. During 1998–2010, 6,691 individuals were sampled in a lower river test fishery to obtain information on relative abundance and time of arrival of specific populations near the river mouth. The genetic differentiation index F ST calculated over all populations and loci was 0.021; individual locus values ranged from 0.017 to 0.045. Differentiation in steelhead allele frequencies among populations was approximately 14 times the differentiation observed among years within populations. A regional structuring of populations was the general pattern observed, with steelhead populations from the upper portion of the drainage clustering together in 87% of dendrograms evaluated and those in the lower portion of the drainage clustering together in 100% of dendrograms. The 17 populations sampled were arranged in nine reporting groups for genetic stock identification applications. The estimated stock composition of a simulated known-origin mixture was within 2% of the correct estimate for seven of the nine reporting groups present in the mixture. The stock composition of an actual known-origin sample was estimated within 2% of the correct estimate for eight of the nine reporting groups present. Application to actual samples from the test fishery indicated that upper drainage populations generally migrated through the lower river earlier than other populations, whereas lower river populations typically migrated later. Genetic mixed-stock analysis can assist managers in regulating fisheries to maintain productivity of Skeena River steelhead.
This study looks at the breeding relationship between steelhead and rainbow trout in Olympic Peninsula watersheds, and explains why knowledge of their mating system is essential to their conservation and management.
A study published in the Journal Evolutionary Applications supports claims that segregated hatcheries do in fact have an impact on the gene pool of wild populations, as discovered in wild steelhead populations from Forks Creek, a tributary to the Willapa River in Washington.
The Wild Steelhead Coalition recommends the adoption of an unconditional, statewide, wild steelhead release policy in Washington State. This policy would mandate that all wild steelhead caught by sport angling methods within Washington State be released unharmed, without exception.