Here it is. Wouldn't include non-commissioned WDFW staff. Fish checkers are not commissioned officers, but are there to gather biological data.
RCW 77.08.010 (19)
(19) "Ex officio fish and wildlife officer" means:
(a) A commissioned officer of a municipal, county, or state agency having as its primary function the enforcement of criminal laws in general, while the officer is acting in the respective jurisdiction of that agency;
(b) An officer or special agent commissioned by one of the following: The national marine fisheries service; the Washington state parks and recreation commission; the United States fish and wildlife service; the Washington state department of natural resources; the United States forest service; or the United States parks service, if the agent or officer is in the respective jurisdiction of the primary commissioning agency and is acting under a mutual law enforcement assistance agreement between the department and the primary commissioning agency;
(c) A commissioned fish and wildlife peace officer from another state who meets the training standards set by the Washington state criminal justice training commission pursuant to RCW 10.93.090, 43.101.080, and 43.101.200, and who is acting under a mutual law enforcement assistance agreement between the department and the primary commissioning agency; or
(d) A Washington state tribal police officer who successfully completes the requirements set forth under RCW 43.101.157, is employed by a tribal nation that has complied with RCW 10.92.020(2) (a) and (b), and is acting under a mutual law enforcement assistance agreement between the department and the tribal government.