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Bug-eyed gold fish with a big frown.
Closeup of a Mudskipper Climbing onto the Mangrove Tree branch, Chonburi Province, Gulf of Thailand
A fish under water
Pacific Lampreys (Entosphenus tridentatus) at a fish ladder window
Goldfish Swimming in a tank
Close up Mudskipper or blenny in mangrove forest of Thailand. Big size of Mudskipper living in swamp forest,  hiding in mud under shade of tree.
four eyed fish
Mandarinfish (Synchiropus picturatus)
Japanese killifish fry in a bottle aquarium
This specimen was photographed during a night dive while standing motionless. It would have been more difficult during the day. The species occurs in the Indo-Pacific from Africa to Japan and Australia (but not in the Red Sea or the Arabian Gulf) widely around coral reefs to a maximum depth of 60 m. Pterocaesio tile grows up to a max. length of 30 cm, the common length is 20 cm. Juveniles occasionally appear in large numbers in shallow lagoons and on reef flats. This species feeds on zooplankton in midwater aggregations and is a typical Tuna baitfish. Palau, 7°4'54.456 N 134°15'43.506 E at 12m depth
Sharks Eye or Atlantic Moon Snails can double their size while moving in the water. This photograph shows the exposed mollusk as it moves on the sandy ocean bottom in search of food.  As needed, the mollusk can shrink down and fit inside the spherical shell.
Cute inhabitant of the seabed, often kept in the aquarium.
Goldfish pond
One stripe fusilier fish Pterocaesio tessellata
piranha
Mandarinfish (Synchiropus picturatus)
Fry of the Yangtze Killifish
Mudskipper with eyes above water
Giant Gourami aquarium fish in blue fish tank Close-up
Image made while snorkeling in Greece
garfish
Syngnathus acus
Close up albino Iridescent shark fish's head,  (Pangasianodon hypophthalmus)  is a species of shark catfish (family Pangasiidae) native to the rivers of Southeast Asia
Goldfish swimming in the water with a black background photographed in Chengdu
European chub, its scientific name is Squalius cephalus
Four-eyed fish is an extremely curious representative of tropical fish due to the special structure of the eyes, in fact there are only two, like the rest of the animals, but each of them is divided into two zones, which allows you to simultaneously look up and down, under water and over water. Inhabits the rivers of Central and South America. It feeds on small insects and crustaceans.
Male Fathead minnow (Pimephales promelas) guarding a clutch of eggs laid on the underside of a submerged log in a murky boreal lake, underwater perspective.
Close-up of the head of a Silver fish in the wild. Seen from the side.
Mangrove Areas Are Nurseries For Young Lemon Sharks - Seen In The  Curieuse Marine National Park On Curieuse Island, Seychelles
A pajama cardinalfish (Sphaeramia nematoptera) with large red eyes, a spotted body, and vivid coloring, swimming against a clean white background. Ideal for concepts related to exotic marine life, saltwater aquariums, and underwater biodiversity.
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