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The suitability of red hybrid tilapias for brackish and seawater culture is suggested by the salinity tolerance exhibited by these parental species, which are known to be moderately (O. niloticus and O. aureus) to highly (O. mossambicus and O. hornorum) euryhaline. The reproductive performance of Florida red tilapia broodstock at salinities of 2, 8, 14, 20 and 26 ppt was studied. Spawning was observed at all salinities. Four spawnings were obtained during the experimental period, and it was noted that there are significant differences between the treatments (P<0.05). The treatment of 2ppt recorded the best and the treatment of 26ppt the lowest results in most reproductive performance parameters. At the end of the experiment, the treatment of 20 ppt was recorded the smallest diameter measurements of eggs (22.15±1.41 μm) and the treatment of 8 ppt recorded the largest one (25.50±0.76 μm).The histological changes that appeared in the ovaries and testes of these fish after the end of the experiment, was recorded.

REPRODUCTIVE PERFORMANCE AND GONADAL HISTOLOGICAL INVESTIGATION OF FLORIDA RED TILAPIA HYBRID BROODSTOCK REARED AT DIFFERENT LEVELS OF WATER SALINITY