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Optimal dietary protein level for juvenile southern rock lobster, Jasus edwardsii, at two lipid levels

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Ward, LR and Carter, CG and Crear, BJ and Smith, DM (2003) Optimal dietary protein level for juvenile southern rock lobster, Jasus edwardsii, at two lipid levels. Aquaculture, 217. pp. 483-500.

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Abstract

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 mean 3.58 SE 0.86 g) were held in 50-l tanks, in a recirculating seawater system at 18 degrees Celsius 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 (mean 59.1 SE 0.8%) or energy digestibility (mean 77.7 SE 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) and feed conversion ratio (FCR, 30 gDCP/MJ DE).

Item Type: Article
Keywords: Dietary protein; Digestible protein requirement; Jasus edwardsii; Southern rock lobster
Journal or Publication Title: Aquaculture
Page Range: pp. 483-500
Identification Number - DOI: 10.1016/S0044-8486(02)00258-2
Additional Information: http://www.elsevier.com/locate/aqua-online
Date Deposited: 16 Mar 2007
Last Modified: 18 Nov 2014 03:13
URI: http://eprints.utas.edu.au/id/eprint/827
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