Data/hora: 11/06/2024 14:49:19

Provedor de dados: | Genetics and Molecular Biology
País: | Brazil
Título: | Genetic variation in a closed line of the white shrimp Litopenaeus vannamei (Penaeidae)
Autores: | Luvesuto,Eloize; Freitas,Patrícia Domingues de; Galetti Junior,Pedro Manoel.
Data: | 2007-01-01
Ano: | 2007
Palavras-chave: | Broodstocks; Inbreeding; Penaeids; Selection.
Resumo: | The culture of the marine shrimp Litopenaeus vannamei has recently boosted the Brazilian shrimp industry. However, it is well known that selection methods based solely on phenotypic characteristics, a reduced number of breeders and the practice of inbreeding may promote a significant raise in the genetic similarity of the captive populations, leading to greater disease susceptibility and impairing both the growth and final size of the shrimps. We used four microsatellite loci to investigate genetic variation in three generations (F5, F6 and F7) of a closed and reared L. vannamei lineage. Although an accentuated heterozygosis deficit was detected, we also observed that the captive propagation of this lineage did not lead to a significant loss of genetic variability over the three generations studied. One possible reason for this is that the breeding conditions of this lineage were good enough to prevent any significant loss of genetic variability. However, three generations may have been insufficient to produce detectable changes in genetic frequencies in the loci studied. Alternatively, the microsatellite loci may have been non-neutral (biased) and related to the conditions in which the shrimps were kept, resulting in a similar allele pool in respect to these four microsatellites over the three generations studied. Any generalizations regarding microsatellite variation in closed shrimp lines may thus be incomplete and should be carefully analyzed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600021
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572007000600021
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.30 n.4 2007
Fonte: | info:eu-repo/semantics/openAccess