تاثير اسيدهاي چرب بلند زنجيره امگا 3 در افزايش مقاومت بچه ميگوهاي سفيد هندي در برابر تنش اسمزي

The Effects of n-3HUFA on the Osmotic Stress Resistance

This study was conducted to determine the resistance of Fenneropenaeus indicus to osmotic stress. PL-l of Fenneropenaeus indicus were reared for 15 days on Artemia urmiana nauplii enriched with various levels of n-3HUFA. On days 10 an 15, their resistance to somotic stress, transfer from 33 ppt to 0 and 6 ppt, for 30 and 60 minutes were analyzed. In PL-10 and PL-15, Postlarvae fed with Artemia containing 33/8 mg/g DW n-3 HUFA and DHAIEPA ratio of 2/5, had a significantly higher resistance in 80% and 100% reduced salinity (P<00.01). Also, there is positive and significant correlation observed between DHAIEPA ratio in Artemia and osmotic stress resistance (Oppt) in PL-10 (r=0.99, P<0.05) and PL-15 (r=0.96, P<0.01). On the other hand, a significant en-elation was found between the osmotic stress resistance of PL-10 in 6 and 0 ppt for 30 minutes as well as the survival recorded in five days later in each tank (r=0.87, P<0.05; r=0.85, P<0.05). It is concluded that resistance to osmotic to osmotic stress is a rapid, inexpensive and valuable quality indicator for postlarval penaeidae shrimp.