Application of DNA parentage analyses for determining relative growth rates of Penaeus japonicus families reared in commercial ponds

Jerry, Dean R., Preston, Nigel P., Crocos, Peter J., Keys, Sandy, Meadows, Jennifer R. S. and Li, Yutao (2006-04-28) Application of DNA parentage analyses for determining relative growth rates of Penaeus japonicus families reared in commercial ponds. Aquaculture, 254 1-4: 171-181.

Document type:	Journal Article
Collections:	Excellence in Research Australia (ERA) - Collection Centre for Marine Studies Publications

Author(s)	Jerry, Dean R. Preston, Nigel P. Crocos, Peter J. Keys, Sandy Meadows, Jennifer R. S. Li, Yutao
Title	Application of DNA parentage analyses for determining relative growth rates of Penaeus japonicus families reared in commercial ponds
Journal name	Aquaculture
Publication date	2006-04-28
Sub-type	Article
Volume number	254
Issue number	1-4
ISSN	0044-8486
Start page	171
End page	181
Total pages	11
Place of publication	Amsterdam
Publisher	Elsevier Science Bv
Collection year	2006
Language	eng
Subject	C1
Abstract	The ability to track large numbers of individuals and families is a key determinant of the power and precision of breeding programs, including the capacity to quantify interactions between genotypes and their environment. Until recently, most family based selective breeding programs for shrimp, and other highly fecund aquaculture species, have been restricted by the number of animals that can be physically tagged and individually selected. Advances in the development of molecular markers, such as microsatellite loci, are now providing the means to track large numbers of individuals and families in commercial production systems. In this study microsatellites, coupled with DNA parentage analyses, were used to determine the relative performance of 22 families of R japonicus reared in commercial production ponds. In the experimental design 6000 post-larvae from each of 22 families, whose maternal parents had been genotyped at 8 microsatellite loci, were stocked into each of four I ha ponds. After 6 months the ponds were harvested and a total of 6000 individuals were randomly weighed from each pond. Mean wet weight of the shrimp from one pond was significantly lower than that of the other three ponds demonstrating a possible pond effect on growth rate. The representation of families in the top 10% of each pond's weight distribution was then determined by randomly genotyping up to 300 individuals from this upper weight class. Parentage analyses based on individual genotypic data demonstrated that some families were over-represented in the top 10% in all ponds, while others were under-represented due to slower growth rates. The results also revealed some weak, but significant, male genotype x environment (G x E) interactions in the expression of shrimp growth for some families. This indicates that G x E effects may need to be factored into future R japonicus selective breeding programs. This study demonstrated the utility of DNA parentage analyses for tracking individual family performance in communally stocked shrimp pond populations and, its application to examining G x E effects on trait expression under commercial culture conditions. Crown Copyright (c) 2005 Published by Elsevier B.V. All rights reserved.
Keyword(s)	Penaeus japonicus genotype by environment DNA parentage analyses genetic improvement Trout Oncorhynchus-mykiss Flounder Paralichthys-olivaceus Environment Interactions Relatedness Determination Microsatellite Markers Genotyping Errors Traits Salmon Bate