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River lamprey on a white background
Curious eurasian otter (Lutra lutra) looking up in a stream.
View from above of a trout suspended in a stream.  Small stream in Sequoia National Park, California.
Dangerous predatory fish piranha swims in the aquarium. Pygocentrus nattereri.
The reedfish, ropefish (more commonly used in the United States), or snakefish, Erpetoichthys calabaricus, is a species of fish in the family Polypteridae alongside the bichirs. It is the only member of the genus Erpetoichthys. It is native to fresh and brackish waters in West and Central Africa. The reedfish possesses a pair of lungs in addition to gills, allowing it to survive in very oxygen-poor water. It is threatened by habitat loss through palm oil plantations, other agriculture, deforestation, and urban development
Electric eel
Hypostomus Plecostomus on green plants in aquarium close-up.
sturgeoniat
Bigtooth River Stingray (Potamotrygon henlei)
Curious eurasian otter (Lutra lutra) looking up.
Cod fish floating in aquarium
Trout Fish Caught in Net - View of fish caught in fishing net after being caught fly fishing. Catch and release ethics.
Close Up of Shortfin eel ,Anguilla bicolor isolated on white background
Ketchikan, Alaska, USA.
Close Up of Eel Swimming in Lake In Auckland New Zealand
The Arctic grayling (Thymallus arcticus) is a species of freshwater fish in the salmon family Salmonidae. T. arcticus is widespread throughout the Arctic and Pacific drainages in Canada, Alaska, and Siberia, as well as the upper Missouri River drainage in Montana.  Wyoming.
Common eel. Anguilla anguilla, single eel in water
A carnivorous freshwater fish that inhabit clear, vegetated lakes, ponds, swamps, and rivers.
Weather loach (Misgurnus fossilis) in natural habitat pond. Underwater shot in the river. Wildlife in nature. Underwater photography of Weatherfish in natural habitat with blurred background.
Swimming grass snake (Natrix natrix), sometimes called the ringed snake or water snake,
Fish in the lake
Aquatic (fresh water) nematode living in pond water among cyanobacteria. Live specimen. Wet mount, 10X objective, transmitted brightfield illumination.
A big tadpole swimming in the water
Sturgeon - Acipenseridae fish
New Zealand Longfin Eel in the River
Fish hatchery stock photos.
Picture shows an sturgeon fish underwater in an aquarium.
Little ringed plover (Charadrius dubius)
Freshwater fish kaluga ( Huso dauricus ) in the aquarium. Amur river endemic.
Pacific herring swimming in the aquarium
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