Dietary effects of micro algae Cyanothece sp. on growth performance, Survival and feed conversion ratio of western white shrimp (Litopenaeus vannamei)

This study was conducted to evaluate the effects of different levels of Cyanothece sp. on growth indices, survival rate and feed conversion ratio of western white shrimp (Litopenaeus vannamei) for 60 days in Chabahar fisheries research center. 240 individual with an average weight of 3.03 ±0.017 g were distributed in 12 tanks with a density of 20 shrimp per liter of storage. Treatment were 0 (control), 100 (treatment 1), 200 (treatment 2) and 300 (treatment 3) mg/kg extract of Cyanothece sp. Growth indices were examined including mean weight, total length, specific growth rate, feed conversion ratio, feed conversion efficiency and survival as 3 meals per day and at the end of the period. The results showed 200 mg/kg of microalgae extract had a positive and significant effect on survival parameters (P<0.05). Mean weight, length and specific growth coefficient (SGR) of shrimp fed a diet containing 200 mg / kg of extract 13.88 g, 13.03 cm and 2.56% were significantly higher than the measured values in other treatments, respectively. While due to the significant increase in feed conversion ratio (FCE) in shrimp treated with 200 mg / kg, the rate of feed conversion ratio (FCR) was significantly lower than other shrimps. It is concluded the use of microalgae extract can have a positive effect on growth rate, survival rate and persistence of young western white shrimp.