Diet of longfinned eels, Anguilla dieffenbachii , in Lake Rotoiti, Nelson Lakes, New Zealand

The diet of 72 longfinned eels, Anguilla dieffenbachii , from Lake Rotoiti, Nelson Lakes National Park, New Zealand, was numerically dominated by snails, especially Lymnaea . Larvae of the dragonfly, Procordulia grayi , were extensively eaten as they migrated towards the shore for emergence. By weight, the most important food was fish, with upland bullies, Gobiomorphus breviceps , most important for eels < 500 mm, and yearling brown trout, Salmo trutta , for eels > 700 mm.