Examines the diet, food web, and seasonal changes in structure of the fish community of the lower Slave River as revealed in sampling studies using gill nets, seines, and set lines used June-December 1994 and May-August 1995. Diet was determined by direct examination and classification of dietary items for the 18 fish species collected, using the percent occurrence method. Catch per unit effort was also calculated for the species. Discussion of results includes summaries of fish life cycles and identification of potential risks of biomagnification effects.