The distribution

disappearance and residue of carbofuran labelled with 14C in a simulated fish/duckweed aquatic ecosystem have been studied. The results show that the carbofuran content in water decreases with take because of being absorbed by sludge of riverbed

eaten by fish and hydrolysis. The residual carbefuran in fish tissues is higher than that in water because of enrichment. There is much difference among carbofuran contents in various fish tissues

and the order in each tissue is found to be viscera > bone > muscle > gill > skin.