การพัฒนาเครื่องหมายติดภายในและการประมาณค่าอัตราพันธุกรรมต่อการเติบโตของกุ้งกุลาดำ Penaeus monodon Fabricius, 1798 โดยวิธี Full-sib analysis / กำธร เลิศสำรวยพันธุ์ = Development of internal tag and estimation of heritability on growth of black tiger shrimp Penaeus monodon fabricius, 1798 by full-sib analysis / Kumthom Lertsumruaybhand
The internal tag made form telephone cable was use to identify shrimp. The tag was injected between the intergument and the muscle on the ventral surface of the fifth pleopods with a syringe 19 gauge needle. Two groups of shrimp were used to test effect of tagging on growth and survival. Experiment one tested for fit size of shrimp to tagging. Small size average body length 5.53 cm. and large size average body length 9.02 cm. The large size of shrimp had significantly high survival rate than those of the small size. Experiment two the average body length at 10.41 cm of shrimp was used to compare tag and untag shrimp for growth rate and survival rate. No statistical difference was found between growth rate and survival rate. Three experiments of estimation of heritabilities for growth in shrimps were conducted using single pair mating. Three groups of shrimp in each of experiment comprised of 40.30 and 14 famillies. They were produced during 2-4 May 1998, 16-23 January 1999 and 26 January 2000, respectively.Each full-sib family was randomly reared in separate units. Length and weight were recorded and analyzed for various variance components. The broad sense heritabilities were estimated at difference ages. The estimated heritabilities were low when the shrimp became old. In the first group, the heritabilities estimated for length at 30-200 day were 0.24+-0.059-0.56+-0.099 ; heritabilities estimates for weight at 30-200 day were 0.24+-0.058-0.40+-0.081. In the second group, the heritabilities estimates for length at 45 and 145 day were 0.30+-0.075 and 0.20+-0.056, respectively, and for weight at 145 day was 0.09+-0.032. In third group, the heritabilities estimates for length at 40-150 day were 0.029+-0.037-0.46+-0.162. Genetic correlations environmental correlations and phenotypic correlations between length and weight of experiments groups one and two were ranged 0.63-1.4 and phenotypic correlations of growth at different ages was varied on different environment. In conclusion, this study shows the significant genetic controls growth in the black tiger shrimp. In addition, the heritability of body length were ranged 0.2-0.4 between at ages of 145 and 150 days. These results was similarlySS to the estimated of heritabilities in other quatic animal. There fore, these investicated will be use in selective breeding program in black tiger shrimp to increase production efficiency.
