Spawn is the eggs and sperm released or deposited into water by aquatic animals.

As a verb, to spawn refers to the process of releasing the eggs and sperm, and the act of both sexes is called spawning. Most aquatic animals, except for aquatic mammals and reptiles, reproduce through the process of spawning.

Spawn (biology) - From Wikipedia, the free encyclopedia

Do not confuse with the term in video games for objects, players, sprites and others instancing.