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of adult oysters (Paul and Davies 1986) and resulted in elevated concentrations of tributyltin in salmon tissues (Short and Thrower 1986; Davies and McKie 1987). Scallops (Pecten maximus) reared in sea pens for 31 weeks on nets coated with tributyltin oxide contained 2.5 mg total Sn/kg fresh weight soft parts (1.9 mg tributyltin/kg), but lost up to 40% during a 10-week depuration period. Scallop adductor muscle contained 0.53 mg tributyltin/kg, suggesting that this tissue--the one consumed by humans--is a probable tin storage site (Davies et al. 1986). Pacific oysters (Crassostrea i as) reared for 31 weeks on tributyltin-exposed nets contained a maximum of 1.4 mg tributyltin/kg FW at week 16 (controls 0.12 mg/kg), but lost 90% during a 10-week depuration period (Davies et al. 1986). Atlantic salmon (Salmo salar) held for 3 months during summer in cages with tributyltin-treated net panels contained 0.75 to 1.5 mg tributyltin/kg fresh weight muscle vs. 0.28 mg/kg at start (Davies and McKie 1987). Based on laboratory studies, it is probable that Atlantic salmon were exposed to approximately 1.0 ug tributyltin/1 during this interval (Davies and McKie 1987). Chinook salmon (Oncorhynchus tshaw tscha), reared in sea pens treated with tributyltin paints, contained <0.013 mg tributyltin/kg muscle fresh weight when introduced into the pens. Concentrations were 0.3 mg/kg after 3 months, 0.8 mg/kg at 13 months, and 0.9 mg/kg at 19 months. Cooking did not destroy or remove organotins from salmon muscle tissues (Short and Thrower 1986). 34