EFFECTS OF DIETARY ENERGY - PROTEIN RATIO ON GROWTH-CHARACTERISTICS AND BODY-COMPOSITION OF HYBRID STRIPED BASS, MORONE-CHRYSOPS FEMALE-XM-SAXATILIS MALE
Academic Article
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
Six semipurified diets with energy: protein (E: P) ratios of 6, 7, 8, 9, 10 and 11 kcal available energy/g protein were fed in triplicate to groups of juvenile hybrid striped bass (initial weight approximately 9.0 g/fish) for a period of 8 weeks in flow-through aquaria receiving fresh well water. The greatest weight gain and protein efficiency ratio values were associated with fish fed diets with E: P ratios ranging from 6 to 9 kcal/g protein. Weight gain was reduced (P < 0.05) and intraperitoneal fat (IPF) ratio (IFF weight 100/body weight) was increased (P < 0.05) as dietary lipid level and E: P ratio increased. Moreover, an increase in dietary lipid level and E:P ratio resulted in higher (P < 0.05) hepatosomatic index (liver weight 100/body weight) and lower (P < 0.05) muscle ratio (whole muscle weight 100/body weight) values. Proximate composition of muscle was not significantly affected by dietary E: P ratio. However, whole-body protein content decreased (P < 0.05) and lipid content increased (P < 0.05) at higher E: P ratios. Liver dry matter and glycogen increased (P < 0.05), while protein and lipid levels decreased (P < 0.05) as E:P ratio increased. The optimum E: P ratio for hybrid striped bass was determined to be 8 kcal/g protein, based on high weight gain and protein efficiency ratio values, as well as lower lipid deposition in the abdominal cavity. 1992.
