Optimising the nutrient specifications of manufactured feeds for farmed juvenile greenlip abalone (Haliotis laevigata Donovan)

TL;DRAbstract

A series of experiments were conducted to investigate the protein, energy and lysine requirements of greenlip abalone Haliotis laevigata. An initial experiment estimated the optimal crude protein requirement. Digestibility coefficients of the protein and energy components of feed ingredients were then estimated and used to formulate diets to investigate the optimal dietary ratio of digestible protein to digestible energy and the effect these parameters have on tissue quality in abalone. Finally, the lysine requirement of greenlip abalone was estimated using two methods of lysine supplementation. The first experiment involved feeding a series of semi-purified diets in which the essential amino acid profile was similar to that of the soft tissue of abalone. Abalone grew fastest at a crude protein level of 20.1%. Excess dietary protein reduced the growth rate. The optimal digestible protein:digestible energy ratio was estimated at 14.4 gDP.M.VDE. Leaching of essential amino acids over 24

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