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Fish as sentinels of environmental health

Boston Harbor, Massachusetts, is polluted by storm water runoff, municipal wastewater, and sewage sludge, as well as riverborne domestic and industrial pollutants, and introductions characteristic of and related to the sustained heavy commercial ship traffic in the port. Shallow areas of the inner harbor provide suitable spawning and nursery areas for winter flounder (Pseudopleuronectes americanus). The harbor contains large numbers of winter flounder during most of the year and is virtually a sanctuary for the species since commercial fishing is prohibited. Recent disease surveys have shown that harbor winter flounder have a high prevalence of gross and microscopic hepatic lesions, including carcinomas. Although harbor sediments contain high concentrations of polycyclic aromatic hydrocarbons (PAR) and polychlorinated biphenyls (PCB), presently the evidence ascribing either one of these organic chemicals as a direct cause of the neoplastic lesions observed is circumstantial.