Photo of a spotted fishing spider perched on the water's surface amid floating duckweed plants

    Aquatic Spiders

    Dolomedes spp., Tetragnatha spp., and others
    Photo of backswimmer, side view

    Backswimmers

    About 32 North American species in the family Notonectidae
    Illustration of a male bluegill

    Bluegill

    Lepomis macrochirus
    Image of a brook silverside

    Brook Silverside

    Labidesthes sicculus
    Image of brown trout

    Brown Trout

    Salmo trutta
    Gray, speckled, translucent gelatinous blob cut in half to show structure

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    Image of a chestnut lamprey

    Chestnut Lamprey

    Ichthyomyzon castaneus
    Illustration of common carp

    Common Carp

    Cyprinus carpio
    invasive icon

    Invasive

    Photo of crane fly larva

    Crane Fly Larvae

    There are over 500 species of crane flies in North America.
    Color illustration of Cypress Minnow

    Cypress Minnow

    Hybognathus hayi
    exclamation mark

    Endangered

    Illustration of an adult flathead catfish

    Flathead Catfish

    Pylodictis olivaris
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    Image of a golden shiner

    Golden Shiner

    Notemigonus crysoleucas
    Image of grass carp

    Grass Carp

    Ctenopharyngodon idella
    invasive icon

    Invasive

    Color illustration of grass pickerel, a long, narrow fish

    Grass Pickerel

    Esox americanus
    No photo available

    Hydras

    Various species in the genus Hydra
    Lake sturgeon illustration

    Lake Sturgeon

    Acipenser fulvescens
    exclamation mark

    Endangered

    Image of a logperch

    Logperch

    Percina caprodes
    Illustration of a male longear sunfish

    Longear Sunfish

    Lepomis megalotis
    Photo of a longpincered crayfish.

    Longpincered Crayfish

    Faxonius longidigitus (formerly Orconectes longidigitus)
    Photo of a ramshorn snail on a wet rock.

    Ramshorn Snails

    Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.
    Image of a redear sunfish

    Redear Sunfish

    Lepomis microlophus
    Photo of stonefly naiad on a rock underwater

    Stonefly Larvae

    There are hundreds of species in North America
    Photo of a pink planarian on a rock.

    Turbellarians (Planarians; Free-Living Flatworms)

    Species in genera Dugesia, Planaria, etc.
    Illustration of a male walleye

    Walleye

    Sander vitreus
    Warmouth

    Warmouth

    Lepomis gulosus
    Image of a white sucker

    White Sucker

    Catostomus commersoni