 In addition to stream watchmen, the Bureau also employed special wardens and operators of chartered boats to enforce fishery regulations.The Bureau of Fisheries also began to use aircraft for fishery patrols in 1929, chartering a seaplane from Alaska-Washington Airways to experiment with aerial patrol over Alaskan waters.The aerial patrols were successful, and regular aerial patrols by Bureau of Fisheries agents using chartered aircraft began in 1930.