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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, Carter, CG, Crear, BJ and Smith, DM 2003 , 'Optimal dietary protein level for juvenile southern rock lobster, Jasus edwardsii, at two lipid levels' , Aquaculture, vol. 217 , pp. 483-500 , doi: 10.1016/S0044-8486(02)00258-2.

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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 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
Authors/Creators:Ward, LR and Carter, CG and Crear, BJ and Smith, DM
Keywords: Dietary protein; Digestible protein requirement; Jasus edwardsii; Southern rock lobster
Journal or Publication Title: Aquaculture
DOI / ID Number: 10.1016/S0044-8486(02)00258-2
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