Which fish is known for the male carrying eggs in a pouch?

The fish known for the male carrying eggs in a pouch is the seahorse. In seahorses, the female transfers her eggs into a brood pouch on the male, where they are fertilized and develop.

The pouch is more than a simple container. It helps regulate salt and water balance, supplies oxygen, removes waste, and provides a protected environment for the embryos. Depending on the species, a male may carry dozens to more than a thousand eggs for several weeks before releasing tiny, fully formed young.

This behavior is often described as male pregnancy, although the female still produces the eggs. Pipefish, close relatives of seahorses, also have male brood-care systems, but the seahorse is the classic and most widely recognized answer to this quiz question.

Seahorses are unusual fish in other ways too: they swim upright, use prehensile tails to grip vegetation, and feed by sucking tiny prey through their tube-like snouts.