Article ID Journal Published Year Pages File Type
2421344 Aquaculture 2016 8 Pages PDF
Abstract

•This paper describes a series of studies designed to determine the energy and protein requirements of cobia, Rachycentron canadum.•The bio-energetic factorial model is possible to iteratively derive optimal energy and protein specifications of cobia.

This study assessed the protein and energy requirements of Cobia (Rachycentron canadum) using a bio-energetic factorial approach. Using a series of inter-related studies, several parameters were defined to enable the construction of a bio-energetic factorial model for this species. The studies included two controlled laboratory experiments and also extensive field-data collection from commercial and research farms in Vietnam. The devised model includes parameters for both maintenance and protein demands; the effect of fish live-weight on maintenance protein (LW0.697), lipid (LW0.972), and energy demands (LW0.815); the efficiencies of protein, lipid and energy utilisation at various protein, lipid and energy intake levels; and the variability in whole body composition with varying live-weight. The protein utilisation efficiencies (0.456 · [protein intake] − 0.445), lipid utilisation efficiencies (1.292 · [lipid intake] − 1.120) and energy utilisation efficiencies (0.651 · [energy intake] − 48.41) were similar to other carnivorous fish species. However, the maintenance requirements for both energy (74.3 kJ/kgBW0.8/d− at 28 °C) and protein (0.99 g/kgBW0.7/d at 27.9 °C) were about double to other species. Using this modelling approach it was possible to iteratively derive optimal dietary protein and energy specifications for this species.

Related Topics
Life Sciences Agricultural and Biological Sciences Aquatic Science
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