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A 30 day tank feeding trial was conducted to determine the optimal dietary ration for large (initial size and length, 1.7 kg, 54.27 cm) two-year-old mulloway (Argyrosomus japonicus) grown in seawater during winter (July-August, water temperature 17.01–20.58°C). Mulloway fed at 0.6% body weight (BW) day-1 were underfed while feeding at 1.0% BW day-1 produced significant wastage, with up to 25% of the weekly ration uneaten. Differences in growth were also evident; fish fed at 0.8 and 1.0% BW day-1 grew significantly faster (SGR, 0.33 and 0.34% day-1, respectively) than 0.6% BW day-1 (SGR, 0.23% day-1). Mulloway fed at 0.8% BW day-1 had the highest condition index (1.14), feed conversion efficiency (78.6%) with minimal wastage (0.312.1% of weekly ration un-eaten). The results of this study suggest that using a feeding rate of 0.8% BW day1has the potential to maximize growth, reduce feed wastage and lower costs of mulloway production.

sdrp journal of aquaculture, fisheries and fish science

Determination of an optimal daily dietary ration for large two-year-old mulloway (Argyrosomus japonicus) using current commercial feed management practices.