Mohammad Gorgij Jaski, Ehsan Kamrani and Alireza Salarzadeh
Investment in the Iranian fisheries sector during past decade lead to Aquaculture development (specially shrimp farming). Light is an important biological factor for living of aquatic animals. Photoperiod parameters such as intensity, duration, and spectrum have important influences on growth, survival, maturation, reproduction and sex ratio of aquatic animals. This study has been done to Study the effect of sun light on growth performance, survival and salinity stress resistance of post larvae of White leg shrimp (Litopenaeus vannamei). For this means we used 2 treatments of direct sun light and blank treatment covering with black plastic upper the rearing tanks as a control treatment in 3 replicates. This study was carried out in Pardis Maigo shrimp hatchery in Jask. At the beginning and the end of the rearing period (20 days), the specific growth rate, weight gain, the final weight and survival rate were determined. Results showed that direct sun light has positive influence on growth performance factors as those factors were significantly higher than control treatment (P < 0.05). In addition this treatment had higher survival rate in rearing period and salinity tests. Based on the results of this study this method can increase the growth, survival and tolerance against unsuitable environmental factors such as salinity fluctuation in L. vannamei post larvae.
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