Growth of Vaname Shrimp (Litopenaeus vannamei) Infested with Extracts of Ectoparasites Chlorella vulgaris as an Immunostimulant

Vannamei shrimp ( Litopenaeus vannamei ) has a high market demand, encouraging production to minimize stress, water quality degradation and disease attack. Ectoparasite attacks come from the genera Epistylis, Zoothamnium , and Vorticella . Body defense through immunostimulants from Chlorella vulgaris extract which has bioactive compounds, vitamins and proteins. The purpose of the study was to determine the effect of giving Chlorella vulgaris extract with different doses and length of maintenance, as well as the interaction of Chlorella vulgaris as an immunostimulant on the growth of vaname shrimp infested with ectoparasites. The research method used a complete randomized experimental design with a factorial pattern consisting of factor A, the dose of Chlorella vulgaris extract, namely without giving Chlorella vulgaris extract (A0), 400 mg/kg (A1), 800 mg/kg (A2), 1200 mg/kg (A3) and factor B, the length of shrimp rearing, namely 0 days (B1), 7 days (B2), 14 days (B3), 21 days (B4), 28 days (B5). This study uses three variables, namely independent variables administration of Chlorella vulgaris Extract and length of maintenance, bound variables Survival (SR), Specific Growth Rate (SGR) and Absolute Growth (GR) and Absolute Growth (GR), and control variables water quality (temperature, pH, dissolved oxygen, salinity, and ammonia). The results of the study at dose A2 with length of rearing B5 gave a real effect (p<0.05) on the growth of vaname shrimp infested with ectoparasites, namely survival (50%), specific growth rate (4,17%), and absolute growth (weight (1,39 grams), length (1,10 cm)).