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A beautiful golden koi swims in a pond.
Marble Angelfish (Pterophyllum scalare) - Freshwater Fish
amazing inhabitants of the microworld under a microscope
Fish Close-Up
A camouflaged \
Perch (Perca fluviatilis)
ocular astronotus or Oscar fish in an aquarium close-up. selective focus
Carp tail close-up isolated on white background
discus  fish in tank
Great Crested Grebe in close-up at Gosforth Park Nature Reserve
Common seadragon or weedy seadragon is a marine fish related to the seahorse. Adult common seadragons are a reddish color, with yellow and purple markings. Some have small leaf-like appendages that look like kelp. This provides protection from any enemy. They are related to the seahorse. This image was shot with a Nikon D3s camera and with a Tamron 16 - 300mm lens.
Red skunk cleaner shrimp - Lysmata Amboinensis
Photomicrograph of mayfly nymph, Baetis species, with leaflike gills on back. Live specimen. Wet mount, 2.5X objective, transmitted brightfield illumination.
Freshwater fish isolated on white background. Known as common, redfin, largescale, Eurasian or European perch, this fish is a predatory species of perch, species: Perca fluviatilis.
Planaria worm in pond water
Great Crested Grebe
A large Bluegill sunfish (Lepomis macrochirus), close-up, isolated on white background.
Rat tailed maggot photographed in a studio
Leafy sea dragon (Phycodurus eques) - perfectly camouflaged saltwater fish living in Australia
Channa maculata swimming in fish tank. An omnivorous fish that lives in the Mekong Delta is used to feed farmers during floods
goldfish in the aquarium
Nereid (segmented worm) from San Fancisco Bay, California, USA. Photographed through a microscope. Wet mount (internal organs visible), 50X, transmitted light.
Study of green floating Azolla Pinnata, A kind of aquatic fern which floats on the surface of water and turns red in Laboratory.
Goldfish swimming in the water with a black background photographed in Chengdu
Sabella pavonina
Great Crested Grebe in a Nature Reserve swimming on a lake.
Leafy Seadragon, Phycodurus eques, from  Western Australia.
Odessa barb Pethia padamya freshwater aquarium fish
Water lily
Free Images: "bestof:Chrysanthia viridissima coxa.JPG Detail of underside of Chysanthia viridissima Photo made by myself 2007-10-04 Siga public domain Chrysanthia viridissima"
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