Concentrations of mono- (MBT), di- (DBT) and tributyltin (TBT) were determined in the muscle and liver of fish collected from Australia, Papua New Guinea and the Solomon Islands. Butyltin concentrations ranged from below the limit of detection to 47 ng g^-1 in muscle and 6.5 to 570 ng g^-1 wet wt in liver. Liver was found to accumulate higher concentrations of butyltins than muscle. Butyltin residues in tissues were not positively correlated with lipid content. Monobutyltin was the predominant species in all samples. The daily dietary intake of butyltins by Australians via fish was estimated to be 377-416 ng person^-1day^-1, lower than is believed to cause health problems.