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Symphysodon discus in an aquarium on a green background

pigeon blood red checkerboard discus fish and cobalt blue discus fish

Blue marbled angelfish of tropical freshwater aquarium isolated on white.

Kenyi or Kennyi cichlid Maylandia lombardoi aquarium fish

Tropical fish swimming through the open water over coral reef

exotic aquarium fish astranatous with close-up

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.

Female Pelvicachromis pulcher kribensis cichlid Aquarium fish

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

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

Uaru amphiacanthoide black-spotted fish swims in a transparent aquarium with a beautiful bright design

Blue marbled angelfish in a tropical freshwater aquarium.

Painted Comber, small seabass grouper fish family Serranus Scriba, of Serranidae family from Mediterranean sea on white wood background

a colorful cichlids fish (pterophyllum scalare) is swimming underwater in an freshwater aquarium in front of a decorative aquascape

Closeup of a brightly colored Emperor angelfish (Pomacanthus imperator), Indian Ocean

Arothron stellatus, also known as the stellate puffer, starry puffer, starry pufferfish, or starry toadfish, is a demersal marine fish belonging to the family Tetraodontidae. It is found in shallow water in the Indo-Pacific region.

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.

Convict cichlid Amatitlania nigrofasciata zebra cichlids aquarium fish

Holacanthus clarionensis, also known as the clarion angelfish, is a species of marine angelfish of the family Pomacanthidae. Baja California. Mexico.

Electric Blue Dempsey fish in the aquarium (Neon Blue Dempsey, Jack Dempsey Neon Blue, Rocio octofasciata, Regan)

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