Feed-nutrients uptake rates of different weight groups of red tilapia (Oreochromis sp.) in a recirculating aquaculture system

Gholamreza Rafiee, Che Ros Saad, Mohd Saleh Kamarudin, Mohd Razi Ismail, Kamaruzaman Sijam

Abstract

The role of different weight groups of the red tilapia on nutrient uptake of the feed supply was investigated in a recirculating aquaculture system (RAS). Five weight groups of red Tilapia viz. 20 (20±0.0), 40 (39.7±0.44), 80 (80.38±0.41), 120 (113.62±1.92), and 180 (177.67±1.81) g in triplicate treatments were designed. The studied nutrients uptake rates by red tilapia were significantly different (P<0.05) between the treatments. It was found that the red tilapia could assimilate 11.46% Fe, 13.43% Zn, 6.81% Mn, 3.55% Cu, 26.81 Ca %, 20.29% Mg, 32.53% N, 7.16% K and 15.98% P content of the feed supply during three weeks culture period. The specific growth rate (SGR) and food conversion ratio (FCR) indices showed significant differences (P<0.05) between the treatments. The highest growth rate was recorded in 120 g treatment. It was concluded that nutrient requirements of the red tilapia are changed in different growth stages. 

 

Keywords

Recirculating aquaculture, Red tilapia, Nutrient retention, Feed, Water quality.

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