Abstract
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.
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Acknowledgements
This research was supported by the private commercial hatchery Acuacultores de La Paz and by grants 100-2 RED-MEX-AQUA and SIMAC 980106078 to A.M. Ibarra, SIMAC 980106079 to H. Mejia, and CONACYT 33496-V to R. Perez-Enriquez. P. Cruz received support from CONACYT graduate fellowship 84027. The editing staff at CIBNOR modified the English text.
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Cruz, P., Ibarra, A.M., Mejia-Ruiz, H. et al. Genetic Variability Assessed by Microsatellites in a Breeding Program of Pacific White Shrimp (Litopenaeus vannamei) . Mar. Biotechnol. 6, 157–164 (2004). https://doi.org/10.1007/s10126-003-0017-5
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DOI: https://doi.org/10.1007/s10126-003-0017-5