Investigation of the nutritional requirements of Australian snapper Pagrus auratus (Bloch & Schneider, 1801): effects of digestible energy content on utilization of digestible protein

Booth, Mark A., Allan, Geoff L. and Anderson, Alex J. (2007) Investigation of the nutritional requirements of Australian snapper Pagrus auratus (Bloch & Schneider, 1801): effects of digestible energy content on utilization of digestible protein. Aquaculture Research, 38 4: 429-440. doi:10.1111/j.1365-2109.2007.01688.x


Author Booth, Mark A.
Allan, Geoff L.
Anderson, Alex J.
Title Investigation of the nutritional requirements of Australian snapper Pagrus auratus (Bloch & Schneider, 1801): effects of digestible energy content on utilization of digestible protein
Formatted title
 Investigation of the nutritional requirements of Australian snapper Pagrus auratus (Bloch & Schneider, 1801): effects of digestible energy content on utilization of digestible protein
Journal name Aquaculture Research   Check publisher's open access policy
ISSN 1355-557X
1365-2109
Publication date 2007-03-01
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1111/j.1365-2109.2007.01688.x
Volume 38
Issue 4
Start page 429
End page 440
Total pages 12
Place of publication Oxford, England
Publisher Wiley-Blackwell Publishing
Language eng
Subject 0704 Fisheries Sciences
Abstract This study used a curvilinear model to investigate the effects of different digestible energy (DE) levels on the digestible protein (DP) requirements of juvenile snapper Pagrus auratus. For each DE level (15, 18 or 21 MJ kg(-1)), DP content was increased from about 210-560 g kg(-1) in seven evenly spaced increments by formulating a summit diet (highest DP content) and a diluent diet (lowest DP content) at the desired DE level and combining the summit and diluent diets in various ratios to achieve the desired DP content. This ensured the DE level remained relatively stable. Each of the 21 dietary treatments was fed to three replicate groups of snapper twice daily to apparent satiation for 57 days. At the completion of the trial, fish were weighed and killed for chemical analysis. Results indicated that the rapid growth of snapper weighing 30-90 g was highly dependent on the ratio of DP to DE and that optimum protein deposition did not occur until snapper were offered feeds with at least 350 g DPkg(-1), irrespective of DE level. According to the fitted models, diets formulated for snapper reared at temperatures from 20-25 degrees C should contain approximately 23 g DP MJ DE-1 to promote optimal weight gain and protein deposition. Based on the feeding regime used in this study, this could be achieved with practical diets containing a DP:DE ratio of 460:20, 420:18 or 350:15.
Formatted abstract
 This study used a curvilinear model to investigate the effects of different digestible energy (DE) levels on the digestible protein (DP) requirements of juvenile snapper Pagrus auratus. For each DE level (15, 18 or 21 MJ kg-1), DP content was increased from about 210-560 g kg-1 in seven evenly spaced increments by formulating a summit diet (highest DP content) and a diluent diet (lowest DP content) at the desired DE level and combining the summit and diluent diets in various ratios to achieve the desired DP content. This ensured the DE level remained relatively stable. Each of the 21 dietary treatments was fed to three replicate groups of snapper twice daily to apparent satiation for 57 days. At the completion of the trial, fish were weighed and killed for chemical analysis. Results indicated that the rapid growth of snapper weighing 30-90 g was highly dependent on the ratio of DP to DE and that optimum protein deposition did not occur until snapper were offered feeds with at least 350 g DPkg-1, irrespective of DE level. According to the fitted models, diets formulated for snapper reared at temperatures from 20-25 °C should contain approximately 23 g DP MJ DE-1 to promote optimal weight gain and protein deposition. Based on the feeding regime used in this study, this could be achieved with practical diets containing a DP:DE ratio of 460:20, 420:18 or 350:15.
Keyword Fisheries
Protein utilization
Protein retention efficiency
Energy content
Snapper
Maintenance requirement
Bidyanus-bidyanus Mitchell
Bass Dicentrarchus-labrax
Varying Dietary-protein
Body-composition
Silver Perch
Sea-bass
Lipid deposition
Maximum growth
Sparus-aurata
Maintenance
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: Excellence in Research Australia (ERA) - Collection
ERA 2012 Admin Only
Centre for Marine Studies Publications
 
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Created: Tue, 19 Feb 2008, 02:30:05 EST