The diversity of plankton in fish aquaculture water of minapolitan Menayu village, Muntilan district, Magelang regency

Plankton is a group of the organism which takes an important role in a water ecosystem because Plankton is natural food for larva organism in the water. The level of plankton production in the water can be used for suspecting potency of stable and unstable water. The condition of water can affect Plankton's life sustainability or their survival which is their diversity. The stability of water condition is the key successful determiner of aquaculture of Trout in Minapolitan, Merayu Village. From the four stations which had been taken its sample, it was found some Phylum of plankton such as Bacillariophyte, Chlorophyte, Cyanophyte, Dinophyte, Sarcodine, Copepoda and Rotifera with 31 genera. Data was taken then calculated by using the Shannon Wiener Method. Base on the Index value of diversity in Station I was about 1.54 – 1.72, Station II was about 1.71 – 2.37, station III was about 1.72 – 2.18 and the station IV was about 2.60 – 3.04. The index of homogeneity in the station I was about 1.27 – 2.08, station II was about 1.78 – 3.17, station III was about 2.12 – 2.96 and the station IV was about 2.48 – 4,43. The Index of dominance in the station I was about 0.93 – 0.96, station II was about 1.78 – 3.14, station III was about 0.78 – 0.91 and station IV was about 0.92 – 0.96. Based on the index value of diversity of plankton in aquaculture water was classified as medium, the index of homogeneity was evenly distributed, and its index of dominance was high. The condition of fish aquaculture in Minapolitan, Menayu village is still in good stability ( stable) and proper for Trout Fish Aquaculture based on its index of Biology.