Effect of dietary protein and lipid levels on growth, body composition and biological and reproductive performances of adult yellow fin sea bream, Acanthopagrus latus

A study was conducted to determine the effects of dietary protein and lipid levels on growth, feed utilization and reproductive performance and biochemical composition of Acanthopagrus latus broodstock. Nine diets representing a combination of three protein levels (40, 50 and 60%) and three lipid levels (15, 20 and 25%) were tested with three replicates in 1140 L cylindrical tanks. Each replicate was stocked with 10 fish with a sex ratio of 1:1 and the average weights were 415g and 236g for females and males respectively. Fish were fed to satiation, twice daily. The growth of females was not significantly affected (P >0.05) protein and lipid levels but growth of males was significantly affected (P<0.05) by dietary protein and lipid levels. Except of protein and lipid efficiency ratios, feed utilization performances of A. latus broodstock was significantly influenced by dietary protein and lipid levels. Reproductive performances of A. latus broodstock was significantly affected by dietary protein and lipid levels, except of buoyant eggs and fertilization rate percentages. Egg dimension, hatchling and 3 day-old larvae were significantly (P<0.05) affected by dietary protein and lipid levels. Body crude protein and lipid concentration were significantly (P<0.05) affected by dietary protein and lipid levels. Protein and lipid concentration of newly hatch and 3 day post hatching larvae varied significantly (P<0.05), whereas only the crude lipid content of the egg varied significantly (P<0.05) with the change of dietary protein and lipid levels. The ratio essential amino acid to non-essential amino acid of carcass, egg, newly hatched and 3 days post hatching larvae were significantly influenced by dietary protein and lipid levels. Fatty acid profile of carcass, liver, egg, hatchling and 3 days post hatching larvae was generally affected by dietary protein and lipid levels. The present study revealed that the best biological and reproductive performance of Acanthopagrus latus broodstock could be achieved at 60% dietary protein and 20% dietary lipid concentration

Effects of dietary protein and energy levels on the growth, feed utilization and body composition of yellow fin seabream Acanthopagrus latus juvenile

A feeding trial was carried out where, three protein concentrations [45%, 55% and 65%, crude protein (CP)] was fed to yellow fin sea bream (Acanthopagrus latus) fingerlings at three dietary energy concentrations [20, 22and 24 Kj g-1 crude energy (CE)] ,to determine the protein and energy requirement for this species. Triplicate groups of 20 fish (average weight 12±.2g) was each stocked in 300-L fiberglass tanks and fed twice a day to apparent satiation. After 8 weeks, the survival was independent of the dietary treatments, but the average fish weight gain (AWG), specific growth rate (SGR), food conversion ratio (FCR) and feed efficiency ratio (FER) were significantly affected by dietary protein (P 0.05). PER, PR, GER, VSI and IFR increased with the increase of energy from 20 to 24 Kj g-1 at the same protein level. Carcass moisture, fat and ash contents were affected by dietary protein and energy levels (P<0.05). Carcass energy content increased with increasing dietary energy, but carcass moisture was decreased with increasing dietary energy from 20 to 24 Kj g-1.. It was concluded that the optimum dietary protein and energy level for growth of juvenile yellow fin sea bream maybe 562-574.7 g kg-1diet and 21.9- 24.56 Kj g-1 respectively