G., M., H., E., A., Z. (1999). EFFECT OF DIFFERENT DIETARY LEVELS OF LIPID ON GONAD MATURATION IN FLORIDA RED TILAPIA "OREOCHROMIS SPECIES (FAMILY: CICHLIDAE) REARED UNDER DIFFERENT SALINITIES.. Egyptian Journal of Aquatic Biology and Fisheries, 3(2), 175-169. doi: 10.21608/ejabf.1999.3422
Mobarram G.; El-Ebiary H.; Zaki A.. "EFFECT OF DIFFERENT DIETARY LEVELS OF LIPID ON GONAD MATURATION IN FLORIDA RED TILAPIA "OREOCHROMIS SPECIES (FAMILY: CICHLIDAE) REARED UNDER DIFFERENT SALINITIES.". Egyptian Journal of Aquatic Biology and Fisheries, 3, 2, 1999, 175-169. doi: 10.21608/ejabf.1999.3422
G., M., H., E., A., Z. (1999). 'EFFECT OF DIFFERENT DIETARY LEVELS OF LIPID ON GONAD MATURATION IN FLORIDA RED TILAPIA "OREOCHROMIS SPECIES (FAMILY: CICHLIDAE) REARED UNDER DIFFERENT SALINITIES.', Egyptian Journal of Aquatic Biology and Fisheries, 3(2), pp. 175-169. doi: 10.21608/ejabf.1999.3422
G., M., H., E., A., Z. EFFECT OF DIFFERENT DIETARY LEVELS OF LIPID ON GONAD MATURATION IN FLORIDA RED TILAPIA "OREOCHROMIS SPECIES (FAMILY: CICHLIDAE) REARED UNDER DIFFERENT SALINITIES.. Egyptian Journal of Aquatic Biology and Fisheries, 1999; 3(2): 175-169. doi: 10.21608/ejabf.1999.3422
EFFECT OF DIFFERENT DIETARY LEVELS OF LIPID ON GONAD MATURATION IN FLORIDA RED TILAPIA "OREOCHROMIS SPECIES (FAMILY: CICHLIDAE) REARED UNDER DIFFERENT SALINITIES.
1National Institute of Oceanography & Fisheries, Alexandria, Egypt.
2Animal &Fish Production Dept., Fac. Agric., Alex Univ., Egypt
Abstract
Results obtained revealed that Florida Red Tilapia attains the ripe stage of maturity at all lipid concentrations in the three different salinities with best contributions at 6 % lipid level for both sexes. The hepato-somatic index increased with increasing salinity for females and males. Results also revealed that females cultured in brackish water (17.8%o) attain the maximum hepatosomatic-index (4.24) at 12% lipid level, while for males the maximum index (3.81) is observed at 9% dietary lipid in seawater (36.2%o). The gonado-somatic index is higher for both sexes reaches the maximum values at all lipid cnocentrations in the brackish water. Results also, showed that optimum condition factor for females (1.32) is found in fresh water at 3% lipid level, while for males tile maxinium one (1.32) is observed at 3% energy level in brackish water. The average condition factors for females and males (1.7 & 1.6 respectively) in seawater are higher than that in fresh and brackish water. Results indicated that in the three different salinities, the sex ratio reaches maximum values at 3% energy levels. Also, it is found that in fresh water the sex ratio is significant at (P<O05) 176 Moharram S.G, EI-Ebiary E.H & Zaki M.A with 9% lipid concentration, while in brackish water this ratio is significant at (P<0.25) with 3% energy level. Diet containing 6% lipid concentration is the optimum one for both sexes Therefore, it is recommended to culture this species in the brackish water at 6 % dietary level of lipid.
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