Document Detail

Identification of stock components using morphological markers.
MedLine Citation:
PMID:  23020555     Owner:  NLM     Status:  In-Data-Review    
This study investigated the development of a quantitative method for distinguishing stock components of Icelandic cod Gadus morhua based on visual examination of morphology. The stock is known to be structured into genetically distinct geographic components (north and south of Iceland) and behavioural types that spawn sympatrically. Differences in morphology were tested between locations, genotypes (a proxy for behaviour) and sexes. Results show morphological markers on the head, fins and body of G. morhua that are correlated with the sex, genotype of the fish at the pantophysin (pan-I) locus and the location at which the fish were caught. Females were found to have relatively deep bodies, and the pan-I(BB) genotype (associated with deep-water feeding behaviour) have greater gaps between their fins. Overall, morphology is more useful for distinguishing sympatric genotypes but less powerful at identifying genetically distinct geographic sub-populations, perhaps because counter-gradient evolution reduces phenotypic differences even with an underlying genetic cause.
B J McAdam; T B Grabowski; G Marteinsdóttir
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Publication Detail:
Type:  Journal Article     Date:  2012-09-05
Journal Detail:
Title:  Journal of fish biology     Volume:  81     ISSN:  1095-8649     ISO Abbreviation:  J. Fish Biol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0214055     Medline TA:  J Fish Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1447-62     Citation Subset:  IM    
Copyright Information:
© 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles.
Institute of Biology, University of Iceland, Sturlugata 7, Reykjavik 101, Iceland.
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