Xác định cường lực và sản lượng khai thác bền vững tối đa nguồn lợi thuỷ sản tại Đầm Nại, tỉnh Ninh Thuận

Abstract

    This study aims to evaluate the current status of maximum sustainable yield and fishing effort of fisheries in Nai Lagoon. The survey used the data collected from yield and fishing effort with five different gear types namely trammel net, crate, longline, stow net, and powered push net which are commonly used in Nai Lagoon from 2012 to 2016. The maximum sustainable yield (MSY) and the corresponding level of fishing effort (f_MSY) in Nai Lagoon estimated by the surplus production model of Schaefer (1954) were 280 tons. In which, MSY and f_MSY of the trammel net were 211.8 tons and 152,169 fishing gear units, the crate was 28.6 tons and 2.61 fishing gear units, the longline were 8 tons and 2,603 fishing gear units, the stow net was 22.4 tons and 8 fishing gear units, and the powered push net was 9.5 tons and 25 fishing gear units. The results showed that the trammel net had exploited 65.2% of the MSY and in excess of 64.6% of fishing effort; the handline and longline had exploited 70.4% of the MSY and in excess of 22.2% of fishing effort; the crate had exploited 56.0% of the MSY and in excess of 61.4% of fishing effort; and the stow net had exploited 67.5% of the MSY and in excess of 61.4% of fishing effort.