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Symphysodon discus in an aquarium on a green background

Close-up of Sailfin tang on the coral reef.

Colorful Coral Reef Teeming with Exotic Fish. Lively and colorful coral reef in a vibrant underwater world. Diverse array of tropical fish swimming freely in their aquatic environment, creating a mesmerizing scene for nature and animal enthusiasts alike.

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

Various river fish swim in a large aquarium in the oceanarium.

Brightly colored tropical fish, mostly tangs and clownfish, anemones and corals in a salt water aquarium.

different fishes in aquarium for design purpose, wallpaper

Tropical fish pets in domestic fish tank

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

Paracanthurus hepatus, Blue tang in Home Coral reef aquarium. Selective focus.

Macro close up of Regal blue tang marine fish, palette surgeonfish, paracanthurus hepatus

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

$Emperor Angelfish (Pomacanthus imperator).\nJuveniles are bluish black with concentric white circles, and transforms to the adult color pattern when reaches the size range 8 - 12 cm.$

Dorado (Salminus brasiliensis) - Freshwater Fish

Powder-blue Tang (Acanthurus leucosternon). Marine aquarium fish Naso lituratus

Symphysodon colourful blue turquoise discus fish in an plant aquarium closeup

Boesemani rainbowfish. School of fish Melanotaenia boesemani in aquarium.

Paracanthurus hepatus is a species of Indo-Pacific surgeonfish, a popular fish in marine aquaria. Common names include regal tang, palette surgeonfish, blue tang (leading to confusion with the Atlantic species Acanthurus coeruleus), royal blue tang, hippo tang, blue hippo tang, flagtail surgeonfish, Pacific regal blue tang, and blue surgeonfish.

Types of marine fish in coral reefs, brightly colored marine fish species

Queen angelfish (Holacanthus ciliaris), also known as the blue angelfish, golden angelfish or yellow angelfish underwater in sea with corals in background

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