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Effects of dietary protein and lipid content on growth performance and biological indices of iridescent Shark ( Pangasius hypophthalmus , Sauvage 1878) fry
Author(s) -
Phumee Preeda,
Hashim Roshada,
AliyuPaiko Mohammed,
ShuChien Alexander Chong
Publication year - 2009
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2008.02116.x
Subject(s) - biology , dietary protein , zoology , factorial experiment , feed conversion ratio , food science , endocrinology , body weight , statistics , mathematics
Dietary protein and lipid effects on growth, body composition and indices of iridescent Shark Pangasius hypophthalmus (Sauvage 1878) fry were studied using a 4 × 2 factorial design. Triplicate groups of 10 fish per tank, with initial mean weights of 3.54–3.85 g were fed eight isocaloric diets comprising a combination of four protein levels (250, 300, 350 and 400 g kg −1 or 25%, 30%, 35% and 40%) and two lipid levels (60 and 120 g kg −1 or 6% and 12%) respectively. The fish were hand‐fed to satiety twice daily for 8 weeks. Specific growth rate (SGR) and feed conversion ratio (FCR) showed significant effects ( P <0.05) with variations in dietary protein and lipid. The highest SGR was observed in fish fed 40% protein/12% lipid diet but this value was not significantly ( P >0.05) different from the fish fed 30% protein/12% lipid diet. The FCR was lowest for the 40/12 diet and differed significantly only with the 25/6, 25/12 and 30/6 treatments respectively. The hepatosomatic index (HSI) was significantly affected by the level of protein, but intraperitoneal fat (IPF) showed significant variation due to dietary lipid level. The HSI significantly ( P <0.05) decreased when dietary protein increased from 25% to 30% but increased marginally thereafter. The IPF values increased with increased dietary lipid but decreased with increased dietary protein. Body protein was positively correlated with dietary protein content; conversely, body lipid content decreased with increase in dietary protein. The results of this experiment indicate the presence of a protein‐sparing effect of lipid as fish fed 30% protein/12% lipid diet had growth and feed utilization comparable to those fed 40% protein/12% lipid diet.