A dietary energy level of 14.6 MJ kg⁻¹and protein-to-energy ratio of 20.2 g MJ⁻¹results in best growth performance and nutrient accretion in silver barbPuntius gonionotusfingerlings

Abstract

Five iso-nitrogenous (300 g protein kg )1 diet) and iso-lipidic (80 g kg )1 diet) semi-purified experimental diets with variable energy levels of 10.5 (D-1), 12.5 (D-2), 14.6 (D-3), 16.7 (D-4) and 18.8 (D-5) MJ kg )1 diets were fed to Puntius gonionotus fingerlings (average weight 1.79 ± 0.02 g) in triplicate groups (15 healthy fishes per replicate) for a period of 90 days to assess the optimum dietary energy level and protein-to-energy ratio (P/E). Fifteen flow-through cement tanks of 100 L capacity with a flow rate of 0.5 L min )1 were used for rearing the fish. Maximum specific growth rate, protein efficiency ratio, protein productive value, RNA : DNA ratio, whole body protein content, digestive enzyme activity and minimum feed conversion ratio was found in fish-fed diet D-3 with 14.6 MJ kg )1 energy level. There were no improvements in all these parameters with the further rise in dietary energy level. Hence, it may be concluded that the optimum dietary gross energy level for maximum growth and nutrient utilization of silver barb is 14.6 MJ kg )1 diet with a resultant P/E ratio of 20.2 g protein MJ )1 diet, when the dietary protein and lipid are maintained at optimum requirement levels of 300 and 80 g kg )1 diet, respectively, for this species. KEY WORDS

Effects of dietary protein and lipid levels on growth, body composition and flesh quality of juvenile topmouth culter,Culter alburnusBasilewsky

“…It was also reported that when the diet was deficient of non‐protein energy, the protein was used for energy rather than the growth (Kim, Wang, Choi, Park & Bai ; Mohanta et al . ).…”

Growth, feed utilization and body composition of juvenile Manchurian trout,Brachymystax lenok(Pallas) fed different dietary protein and lipid levels

“…Fish, like other animals, control their feed intake to meet their energy requirements (Kaushik & Medale ), but excessive energy in the diets is undesirable because it may reduce feed intake, and results in growth and feed efficiency depression because of lack of necessary nutrients such as protein for normal growth (Mohanta et al . ). In the present study, feed intake was affected by dietary protein level and lipid level, and feed intake of fish fed the 80 g kg −1 lipid diet was significantly lower than that of fish fed the 160 g kg −1 lipid diet at 400 g kg −1 protein, this finding agrees with other studies (McGoogan & Gatlin ; Kim & Lee ; Mohanta et al .…”

“…In the present study, feed intake was affected by dietary protein level and lipid level, and feed intake of fish fed the 80 g kg −1 lipid diet was significantly lower than that of fish fed the 160 g kg −1 lipid diet at 400 g kg −1 protein, this finding agrees with other studies (McGoogan & Gatlin ; Kim & Lee ; Mohanta et al . ). However, no significant differences in daily feed intake were observed between lipid levels in the 450, 500 and 550 g kg −1 protein diet, feed intake seemed to adjust to protein intake because of the dietary fishmeal levels.…”

“…By contrast, a positive correlation between HSI and dietary lipid was found in Puntius gonionotus (Mohanta et al . ) and Pseudobagrus ussuriensis (Wang et al . ), while liver lipid increased with increasing dietary energy (McGoogan & Gatlin ).…”

Salinity-induced changes to the survival, growth and glycogen distribution in the early fry stages of silver barb,Barbodes gonionotus(Bleeker, 1850)

“…Knowledge of performance of early silver barb fry at different salinities would likely benefit the aquaculture industry since they are important commercially throughout Southeast Asia and India, with aquaculture production for human consumption increasing from approximately 90,000 tonnes (t) in 2005 to over 160,000 t in 2014 (FAO, ). This is largely due to their relative ease of spawning in captivity, rapid growth rate and high market demand, leading to increased research for aquaculture (Mohanta, Mohanty, Jena, & Sahu, ; Mohanta, Mohanty, Jena, & Sahu, ; Mohanta, Mohanty, Jena, Sahu, & Patro, ). The objective of this study was to assess the effect of different salinities on the survival, growth and glycogen distribution in the early fry silver barb, Barbodes gonionotus .…”