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Symphysodon discus in an aquarium on a green background

Symphysodon colourful blue turquoise discus fish in an plant aquarium closeup

Marble Angelfish (Pterophyllum scalare) - Freshwater Fish

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.

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

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

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

Dwarf cichlid male of Apistogramma Panduro

Tropical fish swimming through the open water over coral reef

Aquarium fish scalaria close-up, freshwater aquarium

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

exotic aquarium fish astranatous with close-up

Tropical fish pets in domestic fish tank

Cichlazoma managuan. Parachromis managuensis. Close-up. Aquarium pet care

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

Cichlasoma Salvini swims in the clear beautiful aquarium

Electric blue jack dempsey cichlid aquarium fish Nandopsis Octofasciatum

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