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Effects of dietary lipid and reduced glutathione on composition and storage quality of channel catfish, Ictalurus punctatus (Rafinesque)
Author(s) -
GATLIN D. M.,
BAI S. C.
Publication year - 1993
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.1365-2109.1993.tb00620.x
Subject(s) - ictalurus , catfish , biology , food science , thiobarbituric acid , fillet (mechanics) , glutathione , factorial experiment , zoology , biochemistry , fishery , antioxidant , fish <actinopterygii> , enzyme , lipid peroxidation , statistics , materials science , mathematics , composite material
. Semi‐purified casein/gelatin diets containing two levels of lipid (5 or 10%) and three levels of reduced glutathione (0,0·1 or 1·0%) in a factorial arrangement were fed to fingerling channel catfish, Ictalurus punctatus (Rafinesque), in aquaria for 10 weeks. Factorial analysis of variance indicated that dietary lipid had significant ( P < 0·05) effects on growth, feed efficiency and body composition of channel catfish. Diets containing 10% lipid generally produced higher weight gain and feed efficiency values as well as higher intraperitoneal fat. The higher level of dietary lipid also produced lower moisture and higher lipid (on a wet‐weight basis) levels in whole‐body and fillet tissues. Stability of fillet samples was estimated by 2‐thiobarbituric acid (TBA) analysis which revealed that 10% dietary lipid significantly elevated fillet TBA values while glutathione did not have any effect. Therefore, dietary lipid level altered growth and body composition of channel catfish as well as oxidative stability of fillet samples while dietary glutathione was generally ineffective.