Some do but oceanic fish can be much harder to breed in captivity, than their fresh water relatives are. There have been some successes such as the striped sea

Some do but oceanic fish can be much harder to breed in captivity, than their fresh water relatives are. There have been some successes such as the striped sea bass hybrid: https://en.wikipedia.org/wiki/Hybrid_striped_bass https://en.wikipedia.org/wiki/Hybrid_striped_bass That being said, many oceanic fish such as the Snook, Snappers and Groupers are not as simple, there are some promising results from a few areas in concerns to these species but most of them center around farm pens in the ocean. so not really brooding and rearing them in on shore artificial salt ponds which would be far more cost effective.