The effect of probiotic on the survival rate and resistance of western white shrimp larvae (Litopenaeus vannamei) against the salinity and formalin stress

This experiment was aimed to determine the effect of Lactobacillus bacteria as probiotic on resistance of white shrimp (litopenaeus vannamei) larvae against stress tests in The Persian Gulf and Oman Sea Ecology Research center. In this study the white shrimp larvae were feed on 6 times a day from mysis1 to post-larvae5 stages by 2 experiment treatments named A (with enriched rotifer by probiotic) and B (with enriched rotifer by probiotic & probiotic powder dissolved in water) and control or C with three replicates in 20-L plastic tanks containing 10-L of seawater with 50 larvae per liter. At the end of period (after 8 days) the shrimp larvae were tested by salinity (10&45 ppt) and formalin (100ppm) stress. The result indicated that the used probiotic bacteria had positive and significant effects on resistance of shrimp (P<0.05) the survival rate and resistance against salinity and formalin stress of containing pribiotic treatments (A&B) were significantly higher than control (P<0.05). The highest survival and resistance were founded in B treatment but it had no significant difference with A (P>0.05). This study showed that using of probiotic has good effect on survival rate and resistance of white shrimp larvae.