The vast majority of fish are

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The vast majority of fish are oviparous, meaning they lay eggs that are fertilized outside of the female's body. This includes both bony fish and cartilaginous fish like sharks and rays. Viviparous fish give birth to live young, while ovoviviparous fish retain the eggs inside the female's body until they hatch. Brooders keep the fertilized eggs inside their body until the young are fully formed and can fend for themselves. Monoecious refers to fish that have both male and female reproductive organs.

The Vast Majority of Fish Are