Feeding Effect Evaluation of Three Microalgae in the Larval Rearing of Litopenaeus vannamei
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Abstract:
The feeding effect of three microalgae, Chaetoceros muelleri, Nannochloropsis oculata and Spirulina platensis in larval rearing of Litopenaeus vannamei was studied. Survival rate of larval prawn (N~M1) and water quality of the culture system were detected to assay the effect of microalgae. The results showed that a better survival rate was achieved as 82.79% when Chaetoceros muelleri biomass of 2.5×105 cells/mL was fed by three times per day. The larval prawn showed activated and metamorphosis regular. Nannochloropsis oculata was unsuitable for Litopenaeus vannamei larvae feeding whether fed as independent or combined with Chaetoceros muelleri, since it induced metamorphosis delay and body surface attachment. Larval prawn survival rate was improved to 88.23% when combined feeding by Spirulina platensis and Chaetoceros muelleri instant of Chaetoceros muelleri independent feeding. The larval prawn showed activated and metamorphosis regular,but the water quality was affected. Flesh Chaetoceros muelleri and Nannochloropsis oculata could reduce NH3-N, NO2-N and aerobic plate count distinctly. This research suggested that larval prawn survival rate improving and water quality optimizing could be achieved by reasonable application of these three microalgae in Litopenaeus vannamei larval rearing.
