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The genetic stock structure of common snook (Centropomus undecimalis)
Tringali, M.D.; Bert, T.M. (1996). The genetic stock structure of common snook (Centropomus undecimalis). Can. J. Fish. Aquat. Sci. 53(5): 974-984
In: Canadian Journal of Fisheries and Aquatic Sciences = Journal canadien des sciences halieutiques et aquatiques. National Research Council Canada: Ottawa. ISSN 0706-652X, more
Peer reviewed article  

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Keywords
    Biopolymorphism; Cell organelles; DNA; Electrophoresis; Fishery management; Population genetics; Stock identification; AW, West Atlantic [Marine Regions]; Marine

Authors  Top 
  • Tringali, M.D.
  • Bert, T.M.

Abstract
    Protein electrophoresis and mitochondrial DNA (mtDNA) restriction fragment length polymorphism (RFLP) analysis were used to analyze the population structure and identify fishery stocks of common snook (Centropomus undecimalis) in the western Atlantic Ocean. For the species, measures of variability in both allozymes and mtDNA RFLPs were low compared with those for fishes with similar life histories, including congeners. In Florida, common snook should be treated as separate management units. Particular RFLPs that were absent from Caribbean snook were prevalent in and endemic to Florida snook, indicating that genetic exchange between populations from these regions is also low. There were no observed differences in the distribution of mtDNA haplotypes among Caribbean island samples, Fst values were comparatively high, indicating that allozyme heterozygosity among these populations was substructured. As with many marine fishes, stocks of common snook were identified principally by differences in genotypic frequencies and in levels of genetic diversity rather than by strict geographic grouping of mtDNA haplotypes or of fixed allelic frequencies.

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