The examination of resistance to salinity stress in post larvaes of Litopenaeus vannamei shrimp fed on artemia enrichment with garlic extract

The effects of salinity stress on survival rates of larvae of Litopenaeus vannamei shrimp was tested for Six nutritional treatments each with three replicates were fed to shrimp larvae (average weight, 0.0013 g) including control treatment which was Artemianaupliiunenriched and second to sixth which were Artemianaupliienriched with 200, 400, 600, 800 and 1000mg garlic extract per kg feed, respectively. The One – way ANOVA results showed that all treatments had differences significantly in terms of survival rates of larvae compare to control group (P<0.05)and among shrimp groups, whose were fed Artemia enriched with 200mg garlic extract per kg feed had the best growth, survival rates and length (0.0062 mg, 81.6% and10.6mm) compared to others. Treatment 3(with concentration of 400mg garlic extract per kg of feed) and control group after the second treatment, performed better growth and survival rates in shrimp larvae than the other treatments but the lowest survival rate evaluated in shrimps fed Artemia nauplii enriched with 600T 800 and 1000 mg garlic extract per kg feed, orderly. Regarding to specific growth rate (SGR) treatments 2and 3were higher compared to other treatments significantly (P<0.05).