Comparison of growth, survival and feed utilization efficiency in a selected strain of Florida red tilapia off-spring (Oreochromis spp.) and origin blue tilapia [electronic resource].

Includes references.

This study was conducted to compare performance in a domesticated strain of Florida red tilapia (Oreochromis spp.) that had been selected for resistance low water temperatures in winter over 5 generations to that of origin unselected blue tilapia (0. aureus) , because its more tilapia species resistant to the cooler water ponds, under different stocking densities conditions (35,50 and 65 fry/ aquarium) during nursing period even access to fingerlings necessary to conduct the second selection phase for the fifth generation off-spring during the winter. Fish were reared in twelve glass aquaria (70 L volumes of water 'aquarium duplicated per treatment) with an average initial weight of 0.022± 0.002 g. One experimental diet was formulated to contain 41.41 % crude protein and 477.87 Kcal gross energy/100 g. fish in each aquarium were fed two times diets daily (six days a week) at a rate of 10-15 % of body weight for 90 days. The Florida red tilapia out performed blue tilapia by growing faster by 73.9% to a large size ingested a greater amount of feed by 131.6% exhibiting greater efficiency in feed conversion and alsO appeared to utilize dietary lipids for energy while sparing protein for growth.

Summary in Arabic.

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