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Realized response of Thai red tilapia to weight-specific selection for growth (3rd - 5th generations)

Network of Aquaculture Centres in Asia

Year of publication 1988

Pages p. 14

Author Parnsri Jarimopas;Fisheries and Aquaculture Management Division

Product type Project

Edition 1

Synopsis (short abstract) Weight-specific selection techniques have been used in various studies of fish growth including those in Thai red tilapia. Employing the techniques, this study aims to determine a selection response and its realized heritability in the fish. In weight-specific selection, the individual fish were initially selected (graded) when they were about six weeks old to standardize their weight. The second grading between weeks 6 and 14 made IT possible to obtain the values of their relative growth rates. The selected line of the Thai red tilapia was found to be 15.7% heavier in wet weight and 7.89% longer in than those of the control line after the second generation. The analysis of variance showed a significant difference both in weight and size between the selected and control lines. The selection response, calculated as the difference between the means of the final population and the control, was 4.32 g. in weight, and 0.86 cm in length. The realized heritability was estimated to be 0.17 a nd 0.29 by weight and length respectively. The selection procedure proved to be effective for the Thai red tilapia and A promising tool for genetic stock improvement.

Language English

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