Conference presentation
Analysis of a complete diallel cross involving three strains of red tilapia reared in earthen pond
Asian Pacific Aquaculture Conference, 2009 (Kuala Lumpur, Malaysia, 03-Nov-2009 - 06-Nov-2009)
2009
Abstract
A genetic improvement program for red tilapia (Oreochromis sp.) initiated in 2007 by the WorldFish Center and Department of Fisheries, Malaysia began with a strain evaluation experiment involving the three strains from Malaysia, Taiwan and Thailand. Data analysis using 2,867 records collected on individually tagged fish after a period of three-months of communal rearing in an earthen pond showed that the strain from Malaysia had the fastest growth rate, whereas the lowest performing strain was that from Thailand. The growth performance of the Taiwanese strain was intermediate. In contrast to the results for body traits, survival rate was poorest for the Malaysian strain (66.4%). The difference in survival rate between Taiwan and Thai strains (78.5 vs. 80.6%) was not statistically significant (P> 0.05). Our results suggested that there were genetic differences in growth performance and survival among red tilapia strains from Malaysia, Taiwan, and Thailand. They were thus included in a complete diallel cross to further examine the additive and non-additive genetic performance of the strains before forming the base population for future genetic selection. In 2008 a complete diallel cross using the best parents of the three strains from Malaysia (A), Taiwan (B) and Thailand © was carried out over two batches of spawning. A total of 66 and 55 full-sib families were produced in the first and second batch, respectively. By far, progeny of the first batch was harvested. Grow-out of fish from the second batch is underway. The main aim of this study was to evaluate growth performance of strain and cross combinations. Statistical analysis was carried out on 4,134 individually tagged fish from the first harvest. The model included the fixed effects of genotype and sex, and the random effect of full sib families. Age and initial weight were also fitted as covariables in the model. The results (Fig.1) showed that the effect of genotypes were highly significant. Overall, growth performance of crossbreds was only slightly higher than that of pure strains. The level of heterosis measured as a deviation of progeny from the average parents was generally small. In the present study, the effects of additive and reciprocal (maternal) genetics were also estimated and discussed.
Details
- Title
- Analysis of a complete diallel cross involving three strains of red tilapia reared in earthen pond
- Authors
- A Hamzah (Author) - National Prawn Fry Production and Research Center, MalaysiaNguyen Hong Nguyen (Author) - WorldFish Center, MalaysiaH Y Yee (Author) - WorldFish Center, MalaysiaN Kamaruzzaman (Author) - WorldFish Center, MalaysiaR W Ponzoni (Author) - WorldFish Center, Malaysia
- Conference details
- Asian Pacific Aquaculture Conference, 2009 (Kuala Lumpur, Malaysia, 03-Nov-2009 - 06-Nov-2009)
- Organisation Unit
- School of Science, Technology and Engineering; Centre for Bioinnovation; School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450488302621
- Output Type
- Conference presentation
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