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Phenotypic and genetic parameters for body measurements, reproductive traits and gut length of Nile tilapia (Oreochromis niloticus) selected for growth in low-input earthen ponds

Authors :
Charo-Karisa, Harrison
Bovenhuis, Henk
Rezk, Mahmoud A.
Ponzoni, Raul W.
van Arendonk, Johan A.M.
Komen, Hans
Source :
Aquaculture. Nov2007, Vol. 273 Issue 1, p15-23. 9p.
Publication Year :
2007

Abstract

Abstract: In this study we present estimates of phenotypic and genetic parameters for body size measurements, reproductive traits, and gut length for Nile tilapia (Oreochromis niloticus) selected for growth in fertilized earthen ponds for two generations. Throughout the experiment, ponds were fertilized daily with 50 kg dry matter, (dm)/ha chicken manure. No supplementary feeds were added. For the analysis, 6429 fully pedigreed experimental fish from G0, G1 and G2 were used. Generations were discrete and therefore parameters were estimated separately for each year. Heritability estimates for body measurements ranged from 0.4–0.6 for standard length to 0.69–0.79 for head length. Phenotypic correlations between body weight and body measurements ranged from 0.64 to 0.89. Genetic correlations were close to unity. The heritability estimate for maturity at harvest (corrected for sex) was 0.13. Heritabilities for carcass traits were estimated from G1 only and were 0.16 for gutted weight and 0.06 for dressing percentage. Phenotypic correlation between body weight and gutted weight was 0.84 and the genetic correlation was 0.20. Heritability estimate for gut length was 0.22. We also estimated a high genetic correlation between gut length index and standard length (0.78) but a low genetic correlation between gut length index and body weight (0.22±0.28). These results suggest that selection for growth on an herbivorous diet could result in a correlated response in gut length. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
00448486
Volume :
273
Issue :
1
Database :
Academic Search Index
Journal :
Aquaculture
Publication Type :
Academic Journal
Accession number :
27667415
Full Text :
https://doi.org/10.1016/j.aquaculture.2007.09.011