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Clownfish
Clownfish are one of the most popular aquarium species and also considered as one of most beautiful fish in the world; up to 43% of the marine ornamentals sold are clownfish. Around 25% of these are bred in captivity. Clownfish have a very unusual biology, and their sex can actually shift between male and female. They also form colonies and care for their young. The male actually guards the eggs, which in the wild are laid on a sea anemone, a creature the fish protects. Experts believe that successful breeding of clownfish will be necessary for this species to survive in the wild.
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