Genetic variability and differentiation in cultured white shrimp Penaeus (Litopenaeus) vannamei with low and high growth

Genetic variability and differentiation in cultured white shrimp Penaeus (Litopenaeus) vannamei with low and high growth

 To find a relationship between allozyme heterozygosity and body size in cultured white shrimp, Penaeus (Litopenaeus) vannamei, a sample was taken at the end of an experimental culture; 72 small organisms of 7.1 ± 1.35 g average weights, and 72 large organisms of 17.5 ± 1....

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Detalles Bibliográficos
Autores principales: Rivera-García, M, Grijalva-Chon, JM
Formato: Online
Idioma:eng
Publicado: Iniversidad Autónoma de Baja California 2005
Acceso en liña:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/70
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Sumario: To find a relationship between allozyme heterozygosity and body size in cultured white shrimp, Penaeus (Litopenaeus) vannamei, a sample was taken at the end of an experimental culture; 72 small organisms of 7.1 ± 1.35 g average weights, and 72 large organisms of 17.5 ± 1.34 g average weights. Ten enzymatic systems were analyzed. Eighteen loci showed good resolution for genetic interpretation. Only EST-2*, EST-3*, EST-4*, EST-5*, and PGM* were polymorphic. Variability values (mean observed heterozygosity, mean number of alleles per locus, and polymorphism) for small shrimp were 0.029 ± 0.020, 1.5 ± 0.20, and 22%, whereas for large shrimp were 0.020 ± 0.010, 1.7 ± 0.20, and 28%. No significant difference was found in heterozygosity for both size-classes. All loci were out of Hardy-Weinberg equilibrium because of a heterozygote deficiency and high inbreeding values. EST-2* and PGM* showed differences in allelic frequencies among both size-classes, and an Fst value of 1.6% was recorded. Both size-classes have a different genetic population structure. Because of the poor information of the analyzed loci and to corroborate that EST-2* and PGM* are involved in growth, it would be necessary to follow the inheritance of those loci in successive generations.

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