spawning grounds; egg-laying site
Refers to a location where fish, insects, or other animals lay eggs. Used in biological, ecological, or fishing contexts.
This river is known as a spawning ground for salmon.
Sea turtles choose sandy beaches as their egg-laying sites.
産卵 means 'egg-laying' or 'spawning' as an action; 産卵場所 specifies the location where it occurs.
Compound of 産卵 (spawning/egg-laying) + 場所 (place/location).