Credit: Juan Suarez Sanchez (Mexico)
This photo shows the cultivation of the Rainbow Trout (Oncorhynchus mykiss) in 300 m3 floating cages, in the dam of Apizaquito, Tlaxcala, Mexico. The cages are stocked at the rate of 16.7 organism m3, with trout fingerlings of 5 grams and 3 centimeters of starting average weight and length, respectively. Commercial feed of 45% protein and 16% fat have been used at a daily rate of 5% of fish body weight. The key water quality parameters were adequate whereas temperature ranged from 16 to 19 °C, pH from 7.4 to 8.4, dissolved oxygen from 6 to 7 ppm, transparency from 42 to 52 cm. In regard to the production economics of such project, the net profit was USD 1800/cage per the 6-month growing period whereas the biomass of harvested fish was 2.48 kg/m3.
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