Development of a nutritional model to define the energy and protein requirements of cobia, Rachycentron canadum

Citation

Van Tien N, Chinh DTM, Huong TTM, Phuong TH, Irvin S & Glencross B (2016) Development of a nutritional model to define the energy and protein requirements of cobia, Rachycentron canadum. Aquaculture, 463, pp. 193-200. https://doi.org/10.1016/j.aquaculture.2016.05.037

Abstract
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 (74.3kJ/kgBW0.8/d−at 28°C) and protein (0.99g/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.

Keywords
Cobia; Nutritional model; Energetics; Protein requirements; Specifications; Bioenergetic

Journal
Aquaculture: Volume 463

People

Professor Brett Glencross

Honorary Professor, Institute of Aquaculture

• Tien et al 2016 -Cobia energetic modelling - Accepted version.pdf