Will the reexpansion of American Eel reduce Brook Trout populations or affect fish stocking in mountain streams?

The article focuses on assessing whether the reexpansion of American Eel (Anguilla rostrata) into northeastern U.S. headwater streams affects Brook Trout (Salvelinus fontinalis) populations or fish stocking efforts. A case study in Crabtree Creek, Virginia, compared stream reaches above a waterfall (with only Brook Trout) and below it (with both species) through stomach content analysis, prey availability, and fish condition metrics. Results showed no significant differences in Brook Trout abundance, size, or body condition between reaches, no evidence of eel predation on trout, and limited diet overlap due to differing prey preferences—Brook Trout favored terrestrial insects while American Eel preferred crayfish. The study concludes that increased co-occurrence of these species poses limited risk of predation or competition, suggesting that eel reexpansion should not hinder trout conservation, dam removal, or stocking programs, though further research on indirect effects is recommended.