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Here you can learn more about the characteristics of fish, and what sets them apart from other animals.
There's the seahorse - the only species in which the male gives birth.
And then there are species like cod, in which females release 3-9 million eggs into the water column.
Some shark species are oviparous, meaning they lay eggs.
Within these live-bearing species, some have a placenta like human babies do, and others do not.