Toxic Effect Of Chromium On Gills Of Cyprinid Fish, Cyprinus Carpio

Abstract

Studies to know the impact of chromium on the gills of Cyprinus carpio was made. In this context, Cyprinus carpio body lengths (4-5cm) were brought live in the laboratory. After acclimatization the fish were exposed to four different concentrations 25mg/l, 30mg/l, 35mg/l and 40mg/l. The findings of the present studies indicated that the effect of chromium was dose dependent. The disintegration takes place in almost every part of the gill at lower concentration of the compound. The gill raker and gill arch lost their integrity at initial stage and at higher concentration disappeared completely. The cells of mucosal epithelium, basement membrane and submucosa at the lower dose disintegrated while at higher concentration showed hyperplasia. Adipose tissue was also disappeared gradually. Primary and secondary gill lamellae also disintegrated initially at lower concentration followed by hyperplasia.