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vol-23EFFECT OF SALINITY ON GROWTH, FEED UTILIZATION AND
HAEMATOLOGICAL PARAMETERS OF FLORIDA RED TILAPIA
FINGERLINGS.
By
E.H.EI-Ebiary*; M.A. Zaki AND M.H. MOURAD
* National Institute ofOceanography and Fisheries, Alexandria, Egypt.
Key words: Red ti/apia; Salinity; Growth performance; Haematological
responses.
ABSTRACT
The present study was designed to investigate the effect ofdifferent
salinities on survival rate, growth performance, carcass composition.
feed and nutrient utilization and some physiological responses of
Florida red tilapia (Oreochromis urolepia hornorum X Oreochromis
mossambicus hybrid). The results showed that the mean survival rate
of fish reared infresh brackish and sea water were 100%,97.5% and
90%, respectively. Significant increases in growth performance and
feed intake were observed when the fish were reared in sea water.
Carcass composition and nutrient utilization increased significantly
when the fish were reared in brackish water than those reared in fresh
, or sea water. On the other hand, the most prominentfeature ofthe
physiological response of red tilapia to different salinities were a
significant increase in plasma sodium concentration, haemoglobin
content and cholesterol values with increasing salinity. Changes in
the plasma total protein, glucose andpotassium were insignificant. It
could be concluded that fish can be reared in salt water up to 36.21
%0 salinity (sea water) without based on the quality product. The
optimal salinity was about 17.81 %0 (brackishwater).
