ANALYSIS OF HISTOPATHOLOGY AND HEAVY METALS CONTENTS OF CADMIUM (Cd) IN TILAPIA (OREOCHROMIS NILOTICUS) IN DOWNSTREAM AT THE REJOSO RIVER OF PASURUAN REGENCY, EAST JAVA, INDONESIA

Abstract

The river is one of the water media susceptible to the pollution of harmful pollutant substances, one of which is the heavy metal Cadmium (Cd). As a result of the large amount of Cd content that enters the river body has an impact on decreasing water quality conditions and disrupting fish health. Histopathological observations in fish are significant to know the picture of fish health through structural changes in organ tissues. The research was carried out in March-April 2021 at the Lower Rejoso River, Pasuruan. The method used survey method with descriptive data analysis. Samples were taken three times with a period of 2 weeks at three different stations. Parameters observed included histopathology of gills, kidneys, and liver of tilapia (Oreochromis niloticus). Heavy metal Cd in water and fish organs, physical and chemical parameters of water including temperature, pH, DO, and COD. The results of histopathological analysis obtained types of damage to the organs of tilapia, namely cell degeneration, necrosis, congestion, and hyperplasia with mild-moderate impact. Observation results of heavy metal Cd in water and tilapia organs have exceeded the specified quality standards. The results of the measurement of physical and chemical parameters of water are still optimal for fish growth. Based on these results, it can conclude that the increasing amount of histopathological damage to fish organs was in line with the high levels of Cd heavy metal in the waters and fish organs.

Keywords

• water quality
• pollution
• degeneration
• congestion
• necrosis