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 resul
ts 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.
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 (W
oody 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.
The objective of this research is to propagate Mentha puligium in
vitro, shoot tips and nodal explant were planted with 0.5-1 cm length
on MS (Murashige's and Skoog) medium with various concentrations
(0.5-1-2-3-4) mg/L of cytokinin BAP.
