Used attributively to modify another noun, e.g., "spawning season".
Definitions
Relating to, occurring during, or characteristic of spawning. Conservationists closed the river to fishing during the spawning season.
spawninggerund / present participle Used attributively as a participial adjective, e.g., "spawning salmon"
Definitions
In the process of depositing eggs for reproduction. Spawning fish congregated near the river mouth.