TOXIC EFFECT OF CHROMIUM ON GILLS OF CYPRINID FISH, CYPRINUS CARPIO

F. N. SOLANGI, S.A. SHAIKH, N. T. NAREJO

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.


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