Effects of Meal Frequency on Growth Performance and Feed Efficiency of Two year-Old Mulloway (Argyrosomus Japonicus; Pisces : Sciaenidae) Reared in Tanks
- *Corresponding Author:
- Jeffrey A Guy
National Marine Science Centre
Southern Cross University, Australia
E-mail: [email protected]
Received Date: November 26, 2015 Accepted Date: March 09, 2016 Published Date: March 11, 2016
Citation:Guy JA, Stephen DA, Smith (2016) Effects of Meal Frequency on Growth Performance and Feed Efficiency of Two year-Old Mulloway (Argyrosomus Japonicus; Pisces : Sciaenidae) Reared in Tanks. J Aquac Res Development. 7:419. doi:10.4172/2155-9546.1000419
Copyright: © 2016 Guy JA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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). Mulloway fed continuously in spring on a 6 day on - 1 day off rotation, had the highest condition index (1.12), grew significantly (P < 0.05) faster (SGR 0.35% day-1) and had better feed efficiency (FCE 76.97%) than fish subjected to two different repetitive periods of fasting and satiation refeeding (1 day on -1 day off, SGR 0.24% day-1, FCE 62.57%; 2 days on - 1 day off, SGR 0.22% day-1, FCE 58.24%); despite these fish exhibiting hyperphagia. Feeding vigour and appetite was more pronounced in the 1 day on - 1 day off than the 2 day on - 1 day off rotation. In autumn mulloway fed 5 days week-1 had the lowest final weight (1.63 kg), grew significantly slower (SGR 0.26% day-1), had poorer feed conversion (FCR 1.63) and condition (K 1.06) than fish fed 7 days week-1 (final weight 1.74 kg; SGR 0.44% day-1; FCR 1.3, K 1.09). The results of this study suggest that two-year-old mulloway do best under a constant feeding frequency while management actions, such as short-term fasting and not feeding on the weekend, will have a negative impact on fish growth and condition.