 It is believed , based on the ecological conditions , that C. maenas could eventually extend its range to colonise the Pacific coast of North America from Baja California to Alaska . Similar ecological conditions are to be found on many of the world 's coasts , with the only large potential area not to have been invaded yet being New Zealand ; the New Zealand government has taken action , including the release of a Marine Pest Guide in an effort to prevent colonisation by C. maenas . 
