RELATIONSHIP AMONG THE PHYTOPLANKTON,PHYSICOCHEMICAL FACTORS AND SHRIMP DISEASE IN INTENSIVE SHRIMP FARMING POND

Abstract:

The main factors affecting the phytoplankton fecundity are nitrogen in NO3or NH4 , phosphorus in phosphate, manganese, etc in the shrimp ponds. The correlative co-efficiency between phytoplankton Skannan-weaver index and eutrophy is significant (R=0. 90 or so). This index is also related to the shrimp survival rate. The correlative co-efficiency between physicochemical factor and shrimp survival rate is not significant, but the varl able coefficient of physicochemical factors is highly ralated to shrimp survival rate. Through adding the photosynthetic bacterium and chloride dioxide (ClO2) to clean water body in pond, the occurrence of shrimp disease reduces.