Growth, reproductive performance, muscle and egg composition in grass carp, Ctenopharyngodon idella (Valenciennes), fed hydrilla or formulated diets with varying protein levels

By M. Khan, A. Jafri, N. K. Chadha. 2004

85 citations recorded by the source corpus.

AbstractGrowth, reproductive performance, muscle and eggcomposition were investigated in grass carp, Cteno-pharyngodon idella(Valenciennnes), fed hydrilla orformulated diets with varying protein levels. Fiveexperimental diets, with varying levels (20%, 25%,30%,35%and40%)ofcrudeprotein(CP),wereused.One of the ¢sh groups was fed hydrilla. Fish(44.1 10.3 cm; 913 9g) were stocked (20tank )inoutdoorconcretetanks(20 10 1.5m)induplic-ate, and fed to satiation, twice daily, at 09:00 and17:00 hours for the experimental duration of 360days.High(Po0.05)weightgainwasrecordedin¢shfed30%and35%CPdiets.However,valuesforgona-dosomatic index (GSI), eggdiameter, relative fecund-ity (eggskg 1 body weight), fertilizability andhatchability (%) were comparable (P40.05) in ¢shat 25% of dietary protein intake. Hydrilla-fed ¢shexhibited lower (Po0.05) values for the measuredparameters. Crude protein content in muscle in-creased with dietary protein level. Highest (Po0.05)muscle proteinwas obtained in ¢sh fed 35% CPdiet.Muscle fat was comparable (P40.05) among ¢sh re-ceiving formulated diets. Ash content was not signi-¢cantly (P40.05) diierent among ¢sh of diierentdietary groups. Moisture content in ¢sh fed formu-lated diets, with the exception of 20% CP diet, didnot vary signi¢cantly (P40.05). Eggs of ¢sh fed for-mulated diets contained higher CP and fat contentsthan those of hydrilla-fed ¢sh. High (Po0.05) mois-turecontentwasnotedintheeggsofhydrilla-fed¢sh.Ctenopharyngodon idellafed formulated diet, with aminimumof25%CP,showedbetterreproductiveper-formancethanthosefedhydrilla.Keywords: dietary protein, hydrilla, Ctenopharyn-godon idella, reproductive performance, proximatecomposition, eggsIntroductionGrass carp, Ctenopharyngodon idella (Valenciennes),feeds naturallyon avariety of macrophytes and hasbeenwidely used for biological control of aquatic ve-getation in various parts of the world (Cross 1969;Chaudhuri, Murty, Dey & Reddy 1976; Leslie Jr, VanDyke, Hestand III & Thompson1987; Jagdish, Rana A Rath, Gupta & Dasgupta1999). Studies on b roodstock nutrition are relatively

Subfields: Aquatic Science, Nature and Landscape Conservation, Physiology

View Paper: https://www.semanticscholar.org/paper/15e1ee5445653a2e013ec5ac91d2d3f9fdbdbcda