Quality of Plankton and Physic-chemical Factors to Support Fisheries and Community Care in Babon River, Semarang, Central Java, Indonesia

The research was conducted by observing the plankton biota, especially in interaction and relationship between riverine biota environmental factors. Plankton enable to provide an indication of changes determining diversity (H’) evenness (e) indices. sampling carried out at 4 stations with different conditions. were sampled using filtering method analysed based on their evenness. Besides, analysis its saprobic is also determine level pollution. results showed that most common species planktons Thallasiosera sp Nitzchia spp. dominates stagnant waters (dams) prospect support growth fish larvae. Other which contribute feed larvae Closterium . Diversity Index (H') shows status environment stability moderate condition, driven temperature speed flow water. It suggested vegetative conservation riverside area could reduce water so providing more suitable habitat for therein