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Tropical fish swimming through the open water over coral reef

Aulonocara cichlid red-shouldered peacock. Aulonocara Hansbaenschi.

Crete island in Greece is a beautiful summer destination - Crete island, Greece, 07-21-2016

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.

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

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

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