Journal
AQUACULTURE
Volume 217, Issue 1-4, Pages 483-500Publisher
ELSEVIER
DOI: 10.1016/S0044-8486(02)00258-2
Keywords
dietary protein; digestible protein requirement; Jasus edwardsii; Southern rock lobster
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This study determined the effect on growth efficiency, nutrient retention and apparent digestibility of varying dietary protein concentration and protein/energy ratio for juvenile southern rock lobster, Jasus edwardsii. Isoenergetic diets were formulated at six crude protein levels (5% increments between 24% and 50%) and at each of two lipid levels (5% and 9%). Duplicate groups of 10 lobsters (initial weight 3.58 +/- 0.86 g) were held in 50-1 tanks, in a recirculating seawater system at 18 degreesC and fed to 95% satiation over a 12-week growth trial. There were significant (P<0.05) differences in apparent crude protein digestibility (76.4-83.2%), but no difference in dry matter (59.1 +/- 0.8%) or energy digestibility (77.7 +/- 0.8%). Survival, feed intake, digestive gland index, protein efficiency ratio, energy efficiency ratio and whole-body composition were not significantly affected by dietary treatment. The relationship between nutrient intake and weight gain indicated optimal dietary digestible crude protein (DCP) levels of 29% and 31% when lobsters were fed diets containing 5% and 9% lipid, respectively. For the two lipid levels studied, the optimal dietary protein/energy requirement was similar for maximum weight gain (29 gDCP MJ DE-1) and feed conversion ratio (FCR, 30 gDCP MJ DE-1). (C) 2003 Elsevier Science B.V. All rights reserved.
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