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

Citation

Jeffrey Alexander Guy, Determination of an optimal daily dietary ration for large two-year-old mulloway (Argyrosomus japonicus) using current commercial feed management practices.(2016)SDRP Journal of Aquaculture, Fisheries & Fish Science 1(1)

Abstract

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 under-fed while feeding at 1.0 % BW day-1 produced significant wastage, with up to 25 % of the weekly ration un-eaten. 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 (0.31-2.1 % of weekly ration un-eaten). The results of this study suggest that using a feeding rate of 0.8 % BW day-1 has the potential to maximise growth, reduce feed wastage and lower costs of mulloway production.

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