Evaluation of 1-stage and 2-stage selection in yellow perch I: Genetic and phenotypic parameters for body weight of F1 fish reared in ponds using microsatellite parentage assignment
Aquaculture Genetics and Breeding Laboratory, The Ohio State University Aquaculture Research and Development Integration Program, Piketon 45661, OH, USA. Journal of Animal Science
(Impact Factor: 2.11).
08/2011; 90(1):27-36. DOI: 10.2527/jas.2011-3902
Two selection methods, 1-stage selection (OSS) and 2-stage selection (TSS), for improving efficiency and profitability of selective breeding of yellow perch were evaluated, through examining the genetic and phenotypic parameters for BW of F(1) fish using microsatellite parentage assignment in this study. Approximately 94% of the sampled yellow perch progeny were assigned to single parental pairs using 8 microsatellite markers, which confirmed the applicability of the communal rearing technique in yellow perch breeding. Within OSS, the genetic correlation between 1-yr-BW and 2-yr-BW was high (0.98), indicating that the growth of yellow perch recorded at yr 1 could predict their growth for yr 2. Also mean family BW and family EBV for BW between yr 1 and 2 were found to be significantly correlated, suggesting yr 1 fast-growing yellow perch families continued to be the fast growing families in yr 2. Two-year random fish undergoing TSS were significantly heavier (P < 0.01) than those undergoing OSS. In addition, top males and females with TSS were heavier (P < 0.01) than those with OSS. Based on these results we concluded that the TSS was more desirable and effective for yellow perch breeding compared with OSS in terms of improving selection efficiency and reducing costs.
Available from: Zachary S. Feiner
- "Moreover, growth traits in yellow perch may be somewhat heritable. One study in a relatively small number of full-sib families estimated heritabilities between 0.075 and 0.14 for length and weight, respectively (Cao et al. 2012), while other studies have shown strong family effects and genotype by environment interactions for growth during the first 2 years of life (Wang et al. 2009a, 2011). In the closely related percid walleye (Sander vitreus Mitchill), heritability of length and weight ranged from 0.30 to 0.93 (Kapuscinski et al. 1996). "
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ABSTRACT: Size-selective harvest of fish stocks can lead to maturation at smaller sizes and younger ages, which may depress stock productivity and recovery. Such changes in maturation may be very slow to reverse, even following complete fisheries closures. We evaluated temporal trends in maturation of five Great Lakes stocks of yellow perch (Perca flavescens Mitchill) using indices that attempt to disentangle plastic and evolutionary changes in maturation: age at 50% maturity and probabilistic maturation reaction norms (PMRNs). Four populations were fished commercially throughout the time series, while the Lake Michigan fishery was closed following a stock collapse. We documented rapid increases in PMRNs of the Lake Michigan stock coincident with the commercial fishery closure. Saginaw Bay and Lake Huron PMRNs also increased following reduced harvest, while Lake Erie populations were continuously fished and showed little change. The rapid response of maturation may have been enhanced by the short generation time of yellow perch and potential gene flow between northern and southern Lake Michigan, in addition to potential reverse adaptation following the fishing moratorium. These results suggest that some fish stocks may retain the ability to recover from fisheries-induced life history shifts following fishing moratoria.This article is protected by copyright. All rights reserved.
Available from: Cong Zeng
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ABSTRACT: Blunt snout bream (Megalobrama amblycephala) is an herbivorous freshwater fish species native to China and has been recognized as a main aquaculture species in the Chinese freshwater polyculture system with high economic value. The genetic parameter estimates for important economic traits are needed for its selective breeding. The aim of this study was to estimate the heritabilities for its growth-related traits and explore the genetic and phenotypic correlations among the traits using microsatellite-based pedigree approach. Offspring from a mass-spawning of 92 broodstocks (42 sires and 50 dams) were reared in a communal pond and nine microsatellites were used to identify the parents of each sampled offspring. Of 749 offspring randomly selected, 708 (94.53%) could be assigned directly to a single parental pair, which was used for heritability estimates. Data were analysed using the method of restricted maximum likelihood (REML) using animal model and the results showed that the heritabilities of body weight, body length, total length and body height were 0.65, 0.53, 0.53 and 0.50, respectively. High genetic correlations were found among these four traits. According to these results, selection for growth seems to be feasible in M. amblycephala and the other growth traits will be heightened accordingly with the selection based on body length.
Available from: Changxu Tian
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ABSTRACT: Retaining pedigree information and genetic diversity in each generation is essential but difficulty in selective breeding of aquaculture species. In this study, simulations and real data analysis were performed to examine the power of microsatellite markers in parentage determination of golden mandarin fish (Siniperca scherzeri). Simulations based on allele frequency data from the population of golden mandarin fish showed that the power of six loci to exclude false parents was higher than 95 % and that of seven loci over 97 %. When marker data from seven loci were combined, the accuracy of assignment to one true parental pair was up to 91.6 % with known parental and filial information. The marker panel tested in mixed families, 89.5 % of progeny was correctly assigned to their parental pairs. The mismatches caused by scoring errors at microsatellites loci were the major reason for the discrepancies between simulations and real data analysis. Taking these results into considerations, it was concluded that microsatellite markers can be used as a tool, alternative to physical tagging, to maintain pedigree information in selection programs of golden mandarin fish.
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