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What does a pregnant zebrafish look like?

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Zebrafish don't get “pregnant”. Females produce eggs, which makes the belly swell up (rounder); and they lay the eggs on the bottom of the tank and then males release sperms to fertilize the eggs. Often if the fertilized eggs are not collected in time they will be eaten by other adult zebrafish. read more

Your guess is good as mine, they are egg laying fish and thus do not get pregnant. A female may become gravid in which case they appear to be pregnant with distended abdomens. read more

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