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Marine Growth and Morphometrics for Three Populations of Atlantic Salmon from Eastern Maine, USA
Author(s) -
Sheehan Timothy F.,
Kocik John F.,
Cadrin Steven X.,
Legault Christopher M.,
Atkinson Ernest,
Bengtson David
Publication year - 2005
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/t04-067.1
Subject(s) - morphometrics , biology , peduncle (anatomy) , meristics , broodstock , stock (firearms) , fishery , zoology , geography , anatomy , aquaculture , fish <actinopterygii> , archaeology
Significant differences in growth and prespawning body morphology were detected among three stocks of Atlantic salmon reared in a common marine environment. Smolts originating from river‐specific broodstock of the Machias, East Machias, and Dennys populations were reared at two marine net‐pen facilities for 25 months. Significant differences in stock‐specific growth were observed among two stocks at both sites, suggesting a genetic basis for the observed phenotypic variation. There was a significant stock effect to the total measured phenotypic variation based on collected truss network analyses. Linear discriminant function analysis of a truss network of morphometric distances allowed for 73% accuracy of stock classification. A thin‐plate spline procedure characterized the Machias body form as having a shortened narrow caudal peduncle region, a compressed body with an elongated trunk, and a deeper head region relative to the other two stocks. Phenotypic variation may be associated with hydrological characteristics of the Machias watershed.