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Symphysodon discus in an aquarium on a green background

Pompadour small fish swimming in aquarium. Red Symphysodon discus swims in fishtank, side view

Neon Tetra Paracheirodon innesi and ember tetra fish stock photo

Green Terror (Andinoacara rivulatus) - Freshwater Fish

Tropical fish pets in domestic fish tank

Flowerhorn Cichlid with green and blue background

blue ram, Mikrogeophagus ramirezi or German blue ram, Asian ram, butterfly cichlid, Ramirez's dwarf cichlid, dwarf butterfly

Underwater photo of school of beautiful colorful cichlid fish in Malawi lake, Africa.

$Mandarin fishes inhabit shallow protected lagoons and inshore reefs. They occur in the Western Pacific from Ryukyu Islands to Australia, usually in small groups spread over small area in a depth range from 1-18m, max. length 7cm. \nMandarinfish do not have scales, but a mucus layer for protection. It is not only a stinky slime they produce, but they also secrete a toxin to protect them against predators. Their dramatic colouration, known as aposematism, is a warning: unpalatability and toxicity - both prey and predator get to live longer. \nThe couples perform an extraordinary courtship dance at dusk. Females gather at the reef, judging if a male is worthy. A male who has successfully courted a lady attaches to her at the pelvic fin. Then the pair swim up from the reef towards the waters surface, releasing a cloud of sperm and around 200 eggs smaller than 1mm. \nThis specimen is a male: The presence of an elongated spine at the front of the first dorsal fin of males is distinctive. Females will not have this spike and will have a rounded first dorsal fin instead. In this case, there was a female too, but she didn't make it into the photo.\nBanda Neira Island, Indonesia, \n4°30'40.842 S 129°53'19.71 E at 1.5m depth$

Parachromis managuensis in aquarium. (Cichlasoma managuense)

The Moorish idol, Zanclus cornutus, is a small marine fish species, of the family Zanclidae. Indo-Pacific and Gulf of California.

Blue marbled angelfish of tropical freshwater aquarium isolated on white.

Tropical fish swimming through the open water over coral reef

Selective focus of The Yellow Peacock cichlid, Aulonocara baenschi from VGP freshwater aquarium.

Marble Angelfish (Pterophyllum scalare) - Freshwater Fish

Full body of colorful discus or pompadour fish, Orange gold fish, isolated on white background with clipping path, Amazon river animal, South America pompadour fish.

Kamfa flowerhorn ornamental fish from Thailand

Close-up of Sailfin tang on the coral reef.

Cichlasoma Salvini swims in the clear beautiful aquarium

The yellow tang (Zebrasoma flavescens), also known as the lemon sailfin, yellow sailfin tang or somber surgeonfish , is a species of marine ray-finned fish belonging to the family Acanthuridae which includes the surgeonfishes, unicornfishes and tangs.

Discus (Symphysodon), multi-colored cichlids in the aquarium, the freshwater fish native to the Amazon River basin

Beautiful Firehead Cichlid (Cichlasoma Synspilum, Vieja Synspilum) in aquarium with big head.

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