Genetic variability assessed by microsatellites in a breeding program of Pacific white shrimp (Litopenaeus vannamei).
Genetic diversity in a shrimp-breeding program was monitored for 2 generations by microsatellite DNA markers (Pvan1578 and Pvan1815) to establish levels of variation and proceed with a selection program. An increase in the number and frequencies of some alleles in both microsatellite loci from G0 to G2 was induced by foreign sire contributions. Most common alleles and high heterozygosities (around 70% in both loci) were maintained through the generations, indicating that there had not been a significant loss of genetic variability in the breeding program. However, when compared with variability in other wild and cultured stocks, the presence of 4 main alleles at both loci may be an indication that a certain reduction in variability already was present in the line used as founder stock (G0). Therefore, it is recommended that additional genetic variability be introduced to the breeding stock by crossing it with a different line.
Cruz
Pedro
P
Laboratorio de Genética Acuícola, Centro de Investigaciones Biológicas del Noroeste (CIBNOR) A.P. 128, La Paz, Baja California Sur 23000, México.
Ibarra
Ana M
AM
Mejia-Ruiz
Humberto
H
Gaffney
Patrick M
PM
Pérez-Enríquez
Ricardo
R
D000818:Animals; D017756:Aquaculture; D001947:Breeding / Q000379:methods; D005787:Gene Frequency; D014644:Genetic Variation; D040582:Inheritance Patterns / Q000235:genetics; D018895:Microsatellite Repeats / Q000235:genetics*; D033561:Penaeidae / Q000235:genetics*