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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.

Hypostomus Plecostomus on green plants in aquarium close-up.

Duck takes risk swimming among New Zealand Long fin eel gathering in stream writhing and slimy.

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

Curious eurasian otter (Lutra lutra) looking up.

A Japanese lamprey eel - yatsume unagi or eight-eyed eel, grabs onto bedrock with its mouth

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

Swell shark, Cephaloscyllium ventriosum, from central California to the Gulf of California

Common eel. Anguilla anguilla, single eel in water

$Striped Eel Catfishes Plotosus lineatus occurs in the tropical Indo-Pacific from the Red Sea and East Africa to Samoa, north to southern Japan, southern Korea, and the Ogasawara Islands, south to Australia and Lord Howe Island. Palau and Yap in Micronesia. \n\nThe species sometimes enters freshwaters of East Africa (Lake Malawi) and Madagascar. \n\n2016 there was a first record in the Mediterranean (The Lessepsian migration is the migration of marine species along the Suez Canal, usually from the Red Sea to the Mediterranean Sea). \n\nThe species occurs in a depth range from 1 to 60m, max. length 35cm, common length 25cm. It is the only catfish found in coral reefs. There is a single highly venomous serrate spine at the beginning of the first dorsal and each of the pectoral fins. \n\nJuveniles form dense ball-shaped schools of about 100 fish; adults are solitary or occur in smaller groups of around 20 and are known to hide under ledges during the day.\n\nKraka Island, Indonesia\n4°30'10.668 S 129°53'17.694 E at 12m depth$

Aquatic (fresh water) nematode living in pond water among cyanobacteria. Live specimen. Wet mount, 10X objective, transmitted brightfield illumination.

Close up view of electricus electrophorus or electric eel or knifefish inside thick glass aquarium in Malang, Indonesia.

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.

Pacific herring swimming in the aquarium

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.

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