(n) Release of gametes (eggs or sperm) from mature adult fish, frogs, molluscs, crustacea, etc.
(adj) Describing behavior related to the readiness of mature adult fish, etc. to release gametes.
Source: PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 806 [Terms] [Paper]