Reproduction

Hydrozoans are mostly broadcast spawners. In some species only sperm is shed, and eggs are retained on the parent. Eggs release
sperm into the water column, where fertilization occurs. The fertilized eggs are retained on the parent, and the parent releases the developing larvae into the water column.

Reproduction in hydroids is often asexual, with the parent releasing a single larva into the water column. In some species, however, the