These fish all start out male

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Original photo by Alex Stemmers/Shutterstock All clownfish are born male. There's a good reason why both main characters in Finding Nemo are male, at least initially. All clownfish are born that way, and it's only when a group's dominant female dies or disappears that a male will develop into a female and become the new matriarch. All clownfish have the ability to turn female, and the change is permanent once it occurs. The transformation begins almost immediately after the dominant female leaves, and starts in the brain before manifesting itself in the sex organs. Had the beloved Pixar film been devoted to scientific accuracy, Nemo's father, Marlin, might not have been just his sole caregiver after tragedy befalls the boy's mother — he might literally have become his mother. Clownfish aren't the only reef-dwellers that can change sex. The bluehead wrasse does it as well, only in reverse: When a dominant male leaves its group, the largest female transforms into a male over the course of just 21 days. Researchers have identified no fewer than 500 fish species capable of changing sex; some, like the coral-dwelling species of gobies, can even switch back and forth. The process is believed to have reproductive benefits, as it allows a single fish to reproduce as both sexes throughout its life.     Male seahorses get pregnant and give birth. Male seahorses get pregnant and give birth.

Clownfish are also called __. Clownfish are also called __. Numbers Don't Lie Length (in centimeters) of the average clownfish 11 Academy Award nominations received by "Finding Nemo," with one win 4 Eggs a female clownfish can lay at once 1,000 Species of clownfish 28 Not all clownfish are orange. Though the orange-and-white look is the most recognizable, it's not the only one clownfish can sport. With nearly 30 different species of clownfish, there are other colors, too: Yellow, red, and black are also common, though most also have the characteristic thick white stripes. Despite being known for their bright colors, clownfish aren't especially friendly when paired with other fish — in fact, they're downright aggressive.    You might also like 8 Mind-Boggling Creatures From the Deep Sea

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