Polycyclic aromatic hydrocarbons (PAH) are ubiquitous environmental contaminants resulting predominantly from anthropogenic pyrolytic and combustion processes. In addition to the usual methods of aerial and aqueous transport to the coastal marine environment substantial amounts of PAH are added through the use of products such as creosote, coal tar and coal tar pitch as preservative and antifouling agents in the marine environment. Many PAH compounds are known carcinogenic agents and are rapidly taken up by fish and shellfish from water. Therefore as human foodstuffs many of these shellfish species warrant monitoring for PAH. A study of PAH in lobster tissues has been carried out using lobsters captured in Sydney harbour, Nova Scotia, Canada. Two coal-coking ovens on the shore have discharged their liquid effluents into the harbour. Lobsters from this area were sampled in 1982 and 1984. This paper presents the materials and methods used in the sampling, the results and discussion of them. The results confirmed the ability of lobsters to accumulate extremely high amounts of PAH in their tissues. 14 references.