Growth Performance, Genetic Diversity and Morphometric Traits of an Introduced Wild and Hatchery Population of Clarias macrocephalus Güther, 1864
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Published:
Jul 14, 2017
Keywords:
bighead catfish strain comparison genetic diversity growth morphometric traits PCA
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Abstract
Clarias macrocephalus Güther, 1864, is important as a female parent for the production of the hybrid catfish widely cultured in SE Asia. A comparison was made between a hatchery strain (KU) which was thought to have low genetic variation, and a wild population (NE) on genetic diversity, growth performance, and morphometric traits. The information obtained will be used for decision making regarding introduction of NE to expand genetic diversity of KU, which will be used as a base population for selective breeding. Sixty day old fingerlings were stocked in 3 replicates of 1 x 2 m2, 0.8 m deep concrete tanks at 70 fish per tank. Fourteen morphometric parameters were measured at 150 days old (90 days of rearing), and the data were SL-standardized prior to analysis using univariate (t-test) and multivariate (PCA and DA). Genetic diversity was analyzed using four microsatellite loci (Cma-04, Cma-05, Cma-08 and Cma-17). The overall growth trial results showed that KU performed better than NE (P < 0.05) based on body weight (BW) and total length (TL) throughout the study; average daily growth (ADG) (P < 0.05) in 3 of 5 time points, and specific growth rate (SGR) in the first and last month of the experiment. Survival rate was not significantly different between populations (P > 0.05) except during 61-90 days of rearing (KU > NE). Three morphometric parameters were significantly different and were capable to separate the two strains. The two populations were genetically different based on allele frequencies, and genetic distance was 1.0395. The genetic variation was not significantly different between strains (P > 0.05). It is recommended that an introduction of NE would compromise the growth performance and some morphometric changes could also occur, although it would increase genetic variation of KU.
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Muiocha, D. A., Onming, S., & Na-Nakorn, U. (2017). Growth Performance, Genetic Diversity and Morphometric Traits of an Introduced Wild and Hatchery Population of Clarias macrocephalus Güther, 1864. Journal of Fisheries and Environment, 41(2), 1–19. Retrieved from https://li01.tci-thaijo.org/index.php/JFE/article/view/92492
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