Yes. Depending on the species, bats eat a variety of flying, terrestrial and aquatic insects.
Salmon eat insects and bugs in their younger life. As they age they will eat larger aquatic species.
Boatsman insects eat aquatic plants, algae, and a few aquatic larva of other species. Backswimmers which look very similar, are predators and have a mean bite.
Many species of ducks will eat snails. In fact, some species are adapted to seek out and eat predominantly such aquatic creatures as snails.
people
birds, other aquatic life, reptiles, people.
Manatees eat many species of aquatic and semi aquatic plants including algae, mangrove leaves, water hyacinths, turtle grass and manatee grass.
Penguins (various species) are semi-aquatic, flightless birds, who eat fish - making them carnivores.
Adult small-mouth salamanders eat insects, spiders, slugs, worms, and aquatic crustaceans. Young small mouth salamanders eat mostly small, aquatic invertebrates like Daphnia and young pillbugs. They even eat larvae of their own or other species of salamanders.
Yes, most pond snails eat elodea, or anachris. However, it usually depends on the species of snail. Land snails do not eat it, and most aquatic ones do.
Plankton aren't a single species. The term encompasses an entire world of species that simply can't swim against the current (similar to pollen in the air). Plankton account for a large portion (if not the largest portion) of the base of the aquatic food chain. If you're an aquatic creature & you don't eat plankton, chances are you eat something that ate plankton.
What do red eye aquatic turtles eat ?