"Diadromous" means regularly migrating between freshwater and salt water. This category includes anadromous, catadromous, and amphidromous fish such as sea-lampreys, sturgeons, salmons, and alewives. Migration should be cyclical and predictable.
N.H. Admin. Code § Env-Wq 1802.05
(See Revision Note at chapter heading for Env-Wq 1800) #8326, eff 4-21-05; ss by #9330, eff 11-26-08