A novel method for studying trophic dynamics of fish is described which involves X‐raying animals which have been fed a diet labelled with metallic iron powder. Results of feeding studies on juvenile Atlantic salmon, Salmo salar L., are presented which demonstrate that food consumption and gastric evacuation rates can be measured without incurring the major disadvantages offeree feeding, starvation or autopsy which are associated with most of the established methods.
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Talbot et al. (1983) studied this question.