Most coastal freshwater lakes are made up of lush vegetation because of the abundance of water. A variety of trees, grasses, marshes, swamps, ponds and lakes make life sustainable for many animal species
Protozoa, which are one celled organisms, are at the bottom of the food chain. They feed smaller fish such as minnows, shad, and bream. Larger predatory fish such as bass, pike, and walleye feed on the smaller fish. Bottom feeders like catfish and crayfish help keep freshwater lakes healthy. Freshwater lakes are also home to mussels, leeches, worms, and many different insects. Frogs and toads live in freshwater as gill breathers until they become adults. Freshwater lake provide homes and nutrition for ducks and other aquatic birds.
Coastal freshwater lakes take up a tiny portion of the surface of the earth and support many species of animal and plant life that could not survive elsewhere. These lakes are fragile and can be adversely affected by climate change and pollution
Carnivores
African clawless otter
Cameroon clawless otter
North american otter
Marine otter
La plata otter
Huillin
Common otter
Speckle-throated otter
Hairy-nosed otter
Indian smooth-coated otter
Giant brazilian otter
Dugongs, manatees, and sea cows
Amazonian manatee
American manatee
African manatee
Read more at the list of biomes of the world...