Allozyme genetic analysis in hatchery strains and wild blue shrimp, Penaeus (Litopenaeus) stylirostris (Stimpson), from the Gulf of California

Authors: Ramos-Paredes, J1; Grijalva-Chon, J M1

Source: Aquaculture Research, Volume 34, Number 3, February 2003 , pp. 221-234(14)

Publisher: Blackwell Publishing

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Abstract:

We conducted a population genetic analysis of Penaeus stylirostris to describe the genetic variability in two wild samples (Guaymas and Peñasco) and in two cultivated strains (A and B), and to determine the relationship among samples. Seventeen enzymatic systems and general proteins were used to visualize 31 loci. Of the 31 loci, 11 polymorphic loci (35%) were detected in all the organisms, with an average heterozygosity of 0.10 and an average of 1.8 per locus. There were no significant differences among the four samples of observed heterozygosity or percentage of polymorphic loci. According to Hardy-Weinberg, both cultivated strains showed disequilibrium in more loci than the wild samples. Guaymas showed linkage disequilibrium in five pairs of polymorphic loci, Peñasco samples in two pairs, A in seven pairs, and B in nine pairs. Peñasco and both cultivated lineages showed evidence of recent reductions in their effective populations size. Based on the comparisons of Fst values, and the distribution of the allelic frequencies, the cultivated strains were significantly different from the two wild populations. There is evidence that strain B originated from A and the discrepancies between the strains are probably the result of genetic drift and a founder effect .

Keywords: allozymes; blue shrimp; genetic vari- ability; Gulf of California; Penaeus stylirostris

Document Type: Research article

DOI: 10.1046/j.1365-2109.2003.00807.x

Affiliations: 1: Universidad de Sonora, Departamento de Investigaciones Científicas y Tecnológicas, Rosales y Niños Héroes s/n, Hermosillo, Sonora, Mexico

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