THE POTENCY OF INCREASING SALINITY IN HISTOPATHOLOGICAL CHANGES OF CLARIAS SP. OSMOREGULATORY ORGANSAwanengga Letsyo Widiarto, Laksmi Sulmartiwi and Boedi Setya Rahardja
Catfish (Clarias sp.) is one of the most leading commodity freshwater fish in Indonesia. Cultivation of Clarias sp. are spread in many regions in Indonesia. However, many areas donât meet the availability of good fresh water, for example in coastal areas and small islands. Water resources in coastal areas generally have a fairly high or brackish salinity. The increase in salinity can affect the metabolism of freshwater fish regulators. These disorders can occur in osmoregulatory organs, namely gills and kidneys. The purpose of this study was to determine the effect of different salinity on histopathological changes in the gills and kidneys of Clarias sp. and to determine the salinity levels that can be tolerated by Clarias sp. Observations were conduted on the histopathology of the gills and kidneys of Clarias sp. with the scoring method which is then continued to statistical test. Based on observations, the histopathological changes found in the gills and kidneys of Clarias sp. were edema, congestion, cell degeneration, inflammation, necrosis, hemorrhage, hyperplasia and fusion. The results of the analysis of gill and kidney scoring showed significant differences (p <0.05) for each salinity concentration. The highest score of scoring was in treatment P3 which is significantly different from treatment P2, P1 and P0. Different salinity concentrations have a significantly different effect on gills and kidneys organ damage of Clarias sp.