The uptake of zinc by young O‐group plaice,Pleuronectes platessawas investigated at levels of high input from sea water and food (Artemianauplii). Zinc concentrations in the fish were strongly weight‐specific and accumulation effects were distinguished by regression analysis. Sea water was estimated to contribute>10 of the total input up to levels corresponding to high environmental concentrations (c.0.1 μg Zn ml−1) and food was the major source of zinc up to sea water concentrations ofc.0.6 μg Zn ml−1. A high degree of regulation obtained along the food pathway to the fish although, in the system studied, most of this regulation was effected by the food organism. Regulation of food input explained the lack of variation in zinc levels previously observed in wild po
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