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Visit for more related articles at Journal of Aquaculture Research & Development Two 4-week tank feeding trials were conducted with market size (1.5 kg ) mulloway (Argyrosomus japonicus) to evaluate current commercial grow-out feeding practices related to short-term fasting.
Growth performance, feed intake and efficiency were evaluated in seawater during spring 2013 (September-October, water temperature 18.22- 21.97°C) and autumn 2014 (May-June, 19.42-23.0°C).
For each bag used 100 pellets (dry weight) were individually weighed to determine a mean pellet weight (g).
All uneaten pellets were collected by flushing the contents of the bottom external pipe into a coarse nylon net and then dried prior to counting following the procedure validated in Guy and Cowden.
Parameters recorded were p H (Spring, range 7.89-8.26; Autumn, range 7.7-8.21) dissolved oxygen (Spring, 5.15-7.83; Autumn, 5.19-8.96 mg L).
Water temperature was recorded in triplicate at hourly intervals using calibrated submersible temperature loggers (i BCod 22L, Thermodata Pty. Water samples (100 m L) were collected twice weekly (am and pm) to determine the total ammonia nitrogen (TAN) (Spring, 0.17- 0.86; Autumn, 0.14- 0.71 mg L) was calculated from an online ammonia calculator using TAN, salinity, p H and temperature data.
As is the case for any emerging aquaculture species, successful culture of mulloway will depend, in part, on the identification of proper feeds and feeding regimens for this species.
This work had ethics approval for research involving animals (SCU approval number ARA 12-13/01).