2014年江苏沿海定置张网渔业生产时空分布特征

本研究基于2014年江苏沿海定置张网渔船的大样本随机抽样调查数据,对渔船捕捞产量及渔获物结构的时空分布特征进行了初步分析.研究结果显示:江苏沿海渔船捕捞具有显著的空间特征,多数在近海生产、少有渔船远赴外海生产,除个别月份,少有渔船在长江口航道中生产,长江口近岸北侧常年有该类渔船生产,在江苏近岸20 m等深线附近水域形成...

Temporal and spatial distribution characteristics of stow net fisheries in Jiangsu Province in 2014

Regardless of the number of fishing vessels or their catch rate, stow net fisheries are an important part of marine fishing in Jiangsu Province, China. However, despite the importance of stow net fisheries in Jiangsu, few studies have focused on this topic. Based on survey data collected from a large random sample of stow net fishing vessels along the coast of Jiangsu Province in 2014, we conducted a preliminary analysis on the temporal and spatial distribution characteristics of fishing vessels and their fishing yield and catch structure. Our results indicate that most fishing vessels are positioned offshore, and few fishing boats go out to the open sea. Few fishing vessels are present in the Yangtze Estuary waterway, except for during a few months of the year. Stow net fishing boats are operational year-round on the north side of the inshore of the Yangtze Estuary, which includes a continuous and relatively high-yielding waterway corridor in the waters near the 20 m contour line of the Jiangsu shore. Fishing boats travel depending on the season: in winter, when the water temperature is low, fishing vessels tend to move further from the coast and southward, whereas in summer, when the water temperature is high, fishing vessels tend to move northward. Based on our analysis of catch structure, we found that there were seasonal changes in the main catch objects, such as shrimp (January-April and October-November), hairy shrimp (February-March, May, and November-December), and swimming crabs (September-November). However, with the exception of the period from January to April and November, the proportion of miscellaneous fish and shrimp in the catches was relatively high. There was a significant negative relationship between shrimp resources and other miscellaneous fish and shrimp resources. Using comparative analysis, we found a corresponding relationship between miscellaneous fish and shrimp present in the catches and juvenile economically important fish. Therefore, we recommend that a fishing ban period be implemented one month in advance. We also recommend that the sizes of the fishing nets be regulated to ensure that the fishery resources can be used sustainably by all relevant stakeholders.