Phytoplankton in Boom Beach, Banyuwangi Regency East Java : Their Existence as a Bioindicator of Water Saprobity

Boom Beach is used as a tourist spot and a turtle breeding place The existence of a relatively dense residential area can provide the potential for waste entering the water area. This can cause a decrease in water quality. The presence of various wastes causes pollution in the coastal area of Boom Beach. The purpose of the study was to determine the probity index of the waters of Boom Beach, Banyuwangi Regency, East Java. This research method uses quantitative methods. The results showed that there were 24 phytoplankton species, the saprobic index value was between 0.000 – 1,200 and the tropic saprobic index value was between 0.133 – 0.600. Based on the average value of the saprobic index, which is 0.657 including -Mesosaprobic and classified as a lightly polluted category for the trophic value of the saprobic index of 0.384 indicating the /α-Mesosaprobic phase and classified as a moderately polluted category.