The study of Growth and Survival of Fairy shrimp Phallocryptus spinosa (Crustacea: Anostraca) in fed with different concentrations of algae Haematococus sp.

To determine the optimal amount of food for growth and survival of Phallocryptus spinosa (Milne-Edwards, 1840) under standardized laboratory conditions, the Haematococussp. was used at five different concentrations: 18×106, 36×106, 54×106, 72×106 and 90×106 cells ml-1. We studied growth and survival of the fairy shrimp on 3, 6, 9, 12 and 15 days of culture. The results indicated significant difference between the growth and survival of the fairy shrimps fed by different algae densities. The highest growth and lowest survival among the treatments was observed in animals fed with concentration 90×106 cells ml−1 on days of 15. The fairy shrimp fed with concentration 54×106 cells ml−1 had the higher survival than all other treatments. Hence, we can conclude that the growth and survival of the P. spinosa increase with increasing density of algae to the given level and any changes have significant negative effects on growth and survival of Phallocryptus spinosa.