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Abstract

Temperature is recognized to be the most important environmental factor affecting growth and protein synthesis in fish. The
optimal temperature for growth of juvenile barramundi is 31 °C, although culture often occurs at temperatures which are above and
below this optimum. Juveniles (2.96±0.46 g) were held at five different temperatures ranging from 21 to 33 °C at 3 °C intervals.
Fish were fed to satiation twice daily (504.5 g kg−1 crude protein, 190.5 g kg−1 lipid, 128.5 g kg−1 ash, and 20.2 GE MJ kg−1).
Daily feed intake (g), growth (% d−1), growth efficiency, and protein synthesis (measured 24 h after feeding) were determined for
each temperature. Feed intake was significantly higher at 33 °C, than at any other temperature. Growth and growth efficiency were
not significantly different between the 27, 30 and 33 °C groups but were significantly higher than the 21 and 24 °C groups. In order
to take account of the variation in protein synthesis over the 24 h following feeding and model daily protein turnover, daily rates of
protein synthesis were estimated from previously determined relationships between white muscle and whole body rates of protein
synthesis. This showed that protein synthesis was not significantly different between 27 and 33 °C, synthesis retention efficiency
was over 40% at these temperatures, and at 21 °C growth efficiency was poor. Growth efficiency and protein metabolism were
optimal over a temperature from 27 to 33 °C.

Item Type:	Article
Authors/Creators:	Katersky, RS and Carter, CG
Keywords:	Barramundi; Feed intake; Growth efficiency; Lates calcarifer; Protein synthesis; Temperature
Journal or Publication Title:	Aquaculture
Publisher:	Elsevier BV
ISSN:	0044-8486
DOI / ID Number:	10.1016/j.aquaculture.2007.02.043
Additional Information:	The definitive version is available at http://www.sciencedirect.com
Item Statistics:	View statistics for this item

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