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An examination of the post‐planting success of hatchery brook charr possessing different mitochondrial DNA haplotypes
Author(s) -
Ashford B. D.,
Danzmann R. G.
Publication year - 2001
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2001.tb02360.x
Subject(s) - biology , haplotype , hatchery , stocking , mitochondrial dna , range (aeronautics) , population , salvelinus , zoology , fishery , ecology , fish <actinopterygii> , genetics , trout , genotype , demography , gene , materials science , sociology , composite material
Previous mtDNA and allozyme studies of brook charr Salvelinus fontinalis from northern Ontario lakes that had been extensively stocked with a government hatchery strain, yielded results that were incongruous with a neutral theory of selection in the mtDNA genome. A single haplotype (haplotype 1) predominated in all the fish sampled from these lakes, which is consistent with the observed distribution of this haplotype in northern portions of the species range. However, haplotype 1 does not occur in a high frequency within the hatchery strain. In a direct survivorship experiment, of 1500 fish stocked into an Ontario lake in the spring of 1994 containing a native population of brook charr, no significant differences between stocking and recapture mtDNA distributions were observed in the summer of 1994. However, a survey of young of the year in the following spring did not reveal the presence of any ‘private’ hatchery haplotypes. Significant differences in the distribution of mtDNA haplotypes were observed in two stocked lakes compared to those in the putative source hatchery strain. Haplotype 1 predominated in both these stocked lakes, suggesting that fish with this haplotype possessed increased survivorship.