Quantitative analysis of cruise duration and range of Chinese fishing vessels based on VMS

Abstract:

The topological relationship between the fishing ground grids and the sea channel of the fishing vessels was used. A calculation method for the cumulative time and cruise of fishing vessel was designed. The cumulative time was 34.39 million hours. The total voyage is 255.12 million km.The fishing vessels in the provinces were mainly distributed in the fishing grounds near them. The fishing vessels in Liaoning Province have a narrow and long distribution from north to south. There are two centers for the distribution of fishing vessels in Shandong Province, one is Lianqingshi Fishing Ground and Haizhou Bay Fishing Ground in the East China Sea, and the other is Laizhou Bay Fishing Ground in the Bohai Sea. Fishing vessels in Zhejiang Province have one center. They are Yushan Fishing Ground and Zhoushan Fishing Ground. There are two centers in the distribution of fishing vessels in Guangxi, one is the North of Beibu Gulf fishing ground and the other is the Northwest of Nansha fishing ground. The cumulative time values of fishing vessels in Liaoning, Shandong, Zhejiang and Guangxi all show two valleys, one in February and the other from May to August. There are two peaks, one is from March to April, and the other is from September to November. The cumulative time of Liaoning and Shandong provinces is obviously lower than that of Zhejiang and Guangxi provinces from January to March. The fishing vessels in China are mainly small-sized, and the proportion of large and medium-sized fishing vessels is low. The fishing vessels in each province were mainly distributed in nearby fishing grounds. The cumulative time and voyage of fishing grounds in offshore waters are higher than those in distant waters. The accumulated time and voyage of fishing vessels in provinces, cities and fishing grounds were analyzed. The fishing grounds with higher cumulative value are mainly located in offshore waters. The data quantification and analysis methods and research results may provide valuable reference for China's fishery quota fishing management.Quantitative methods and statistical results can be used in fishery quota management.