Most marine fishes are:

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Most marine fishes are oviparous, which means they lay eggs that hatch outside the body. This is true for the vast majority of fish species, including those found in oceans and seas around the world. Some species are ovoviviparous, meaning they produce eggs that hatch inside the body and give birth to live young, but this is relatively rare in marine fishes. Live-bearers and viviparous species are even less common in the marine environment. Catadromous species are those that migrate from freshwater to the sea to spawn and are not a reproductive mode.

Most Marine Fishes Are