The Effect of different Water Salinities on Growth of Blue tilapia (Oreochromis aureus) Broodstock

The broodstock of Blue tilapia (Oreochromis aureus) were reared in glass aquaria in the laboratory of the High Institute of Marine Research to study the effect of different water salinities on growth rates of those broodstocks and comparing the results with those obtained from the natural environment (freshwater). The broodstock were transported from El-Sin Fish Farm- Banias to the culture aquaria at the beginning of April (2011). After acclimation to the three studied water salinities (7‰, 14‰ and 19 ‰) in three aquaria (the forth aquarium was left as a control: fresh water), the fish were fed on a diet containing 35 % protein till satiation, twice a day for 72 days. The results revealed that the broodstock reared at 14‰ Salinity produced the best weight gain, where the weight gain was 18.76 g/fish with a feed conversion rate (FC) of 2.04. The weight gain was 17.16 g/fish for the fish reared at 7‰ with a FC= 2.51, while broodstock reared at fresh water gained 14.63g/fish with a FC= 2.97. The worst weight gain was obtained from the broodstock reared at 19‰ (9.24 g/fish) with a FC= 3.7.

Using the plant tissue culture techniques in micropropagation and conservation of the endangered Red Doumani grape cultivar

In this study, we used plant tissue culture techniques for micropropagation of the endangered Red Doumani cultivar. The explants which were the apex tips and axillary buds (0.5-1 cm) have been cultured on the free of hormones initial medium WPM (Woody plant medium), then moved to the micropropagation media. The results showed that the medium containing 4.44 mM BA + 0.58 mM IAA had the best effect on number of new shoots formed (2.6) and the growth started after 9.22 days, the best elongation was on the medium supplemented with 4.6 mM KIN + 0.58 mM IAA and the rate of multiplication reached 5.15 shoots.

In Vitro Propagation and In Vivo Acclimatization of Sour Orange (Citrus aurantium L.)

Some factors which affect in vitro propagation of sour orange (Citrus aurantium. L.) were studied on Murashige and Skoog medium. Medium containing ١,٠ mg/L ٦-Benzylaminopurine (BA) was satisfactory for shoot multiplication, Dichlorophenoxyacetic acid (٢،٤-D) was not effective for shoot proliferation and it enhanced callus formation.