The aquatic environmental quality of koi fish (Cyprinus carpio) pond infected by Myxobolus sp. based on the biological status of the phytoplankton

Abstract

The purpose of this study was to observe the biology of phytoplankton found in the waters pond of C. carpio and the Myxobolus sp. infect C. carpio in Blitar, Indonesia. Analysis of the sample of phytoplankton in water pond, identification of phytoplankton in the targeted fish organs infected with Myxobolus sp. C. carpio samples have a length of 1-3 cm and weight of 5-8 grams. Observation of both phytoplankton and myxobolus samples was done using the Olympus CX31 microscopes and Olympus E330-ADU1.2X cameras. The identification results showed that the phytoplankton was from the Charophyta division, genus Mougeotia, Division of Chlorophyta, genus Pediastrum, and Ulothrix, Division of Cyanobacteria, genus Mycrocystis. In Myxobolus sp. infected koi, the gills, the stomach, and the intestine indicated phytoplankton. The phytoplankton found in water cultured pond of koi fish allegedly biologically became an intermediary for infection in koi fish. The conclusion is the biological phytoplankton from the genus Mougeotia, Pediastrum, Ulothrix, and Mycrocystis, found both in the waters pond and in the target organs of infected fish such as in the gill, the stomach, and the intestines. This finding used to make a decision to treat the waters pond for successfully fish culture.