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Symphysodon discus in an aquarium on a green background

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.

Pterophyllum scalare. Angelfish. One orange scalar swims in a transparent aquarium on a green background

An Oscar fish, Red velvet, Cichlid, warm color tone, orange black mottled color, swimming in the tank underwater with blurred background, Phuket aquarium

Tropical fish pets in domestic fish tank

Yellowband angelfish or Pomacanthus maculosus also known as the halfmoon angelfish. Wildlife animal

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

Close-up of Sailfin tang on the coral reef.

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

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.

Andinoacara rivulatus, Aequidens rivulatus. Akara turquoise in the aquarium close-up

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

different fishes in aquarium for design purpose, wallpaper

Large group of tropical fish on colorful corals underwater.

Acara turquoise, Astronotus, Cichlazoma severum, representatives of South American cichlids.

Symphysodon colourful blue turquoise discus fish in an plant aquarium closeup

Yellow Discus (Symphysodon aequifasciatus) - Freshwater Fish

Malawi cichlids. Fish of the genus Cynotilapia. Christmas tree lights

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

Freshwater aquarium with cichlids as pseudo-sea. Aquascape and aquadesign of aquarium

Close up of two ornate butterflyfish swimming around coral heads in Hawaii.

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