As previously noted, the pearls constitute only an incidental catch in the fisheries on the Australian coast, but in the aggregate the yield is very large. The yield in the northwest Australian fishery in 1906 is estimated at £50,000, local valuation; in the Queensland fishery £33,000; in that of South Australia £5000, a total of £88,000 or $440,000.[262] Relatively few seed-pearls are obtained, and some of the pearls are of great size. Some beautiful specimens have been found, but usually they have less luster and are more irregular in form than the Persian or the Indian output. Among the remedies suggested for improving the condition of the Australian pearl reefs may be mentioned the establishment of six inches as the minimum size of the shell that may be taken (five inches is now permitted in Queensland, and there is no restriction in Western Australia), the closure of certain areas for stated periods from time to time, and a limit on the number of vessels employed. The government resident at Thursday Island, Mr. Hugh Milman, who has had long acquaintance with the industry, strongly recommends the adoption of a system of artificial culture; and in the meantime, to foster the industry, “licenses should be granted to a reduced number of boats and certain sheltered areas should be closed altogether for a few years to give the beds time to recover. This latter procedure, however, the pearlers themselves are not in favor of, as they are of the opinion that the weather conditions against which they have to contend are sufficient protection to prevent the denudation of the principal grounds.” A few years ago certain areas in Torres Straits were proclaimed closed for a period against the removal of pearl shell; but, owing to the want of effective patrol, the shell was poached to a very large extent, and consequently the good that should have resulted from the experiment was not apparent. Owing to the impracticability of continuous patrol, and the want of proper legislation to bring die offenders to book, it was decided to remove the restrictions.