Optimal utilization of bio economic social model for chub mackerel in the East and Yellow seas

Abstract:

Chub mackerel (Scomber japonicus) is an important economic species in the coastal waters of China, and its sustainable utilization and scientific management has been attractive and attentions by peoples. In this paper, based on Gordon Schaefer bio economic model, we use the catch data of purse seine fishery and economic data from China, Japan and Korea from 1998 to 2008 to calculate the Maximum Sustainable Yield (MSY), Maximum Economic Yield (MEY), Bio economic balance point (BE) and their corresponding fishing efforts. Combined with the above results, the bio economic social synthesize model based on different weight is established by considering the impact of biology, economy and society, to compare the economic benefit and resources status of different management objectives at short term (1-5 years), middle term(10 years) and long term(20 years). The results showed that the resources of chub mackerel is overfishing now. If the MEY is considered as the management objective for maximum long term economic benefit, the resources status keeps well but with low social employment rate. If the BE is considered as management objective for maximum short term economic benefit, it will provide a plenty of employment, but long term economic benefit is the lowest and the resources status will be worst. It is found the comprehensive benefit of fishing program 9 in all aspects is the best. The results showed that the most suitable fishing efforts is 19 889 fishing nets by considering the impact of all factors, and the suitable CPUE should keep between the corresponding fishing effort of MEY and MSY, and slightly close to MSY.