Cal. Fish & Game Code § 3681

In Districts 8 and 9, it is unlawful to take ducks or geese in any manner below the incoming or outgoing tidewater’s edge or from any blind, boat, floating device, island, islet, or exposed tidal flat except on Saturdays, Sundays, Wednesdays, holidays and the opening and closing days during the prescribed open season except that the use of boats is permitted to retrieve crippled or dead birds.