Modeling the Hook Depth Distribution of Pelagic Longlining in the Equatorial Area of Indian Ocean

作     者：SONG Liming LI Jie GAO Panfeng ZHOU Ji XU Liuxiong 

作者机构：National Engineering Research Centre for Oceanic FisheriesShanghaiOcean UniversityShanghai 201306P.R.China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Chinese Ministry of EducationCollege of Marine SciencesShanghai Ocean UniversityShanghai 201306P.R.China College of Marine SciencesShanghai Ocean UniversityShanghai 201306P.R.China Lianyunggang Fishery DetachmentLianyunggang 222004P.R.China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2012年第11卷第4期

页      面：547-556页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0908[农学-水产] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070601[理学-气象学] 08[工学] 0710[理学-生物学] 0707[理学-海洋科学] 0815[工学-水利工程] 080501[工学-材料物理与化学] 0706[理学-大气科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0824[工学-船舶与海洋工程] 

基　　金：funded by Ministry of Agriculture of China under Project of Fishery Exploration in High Seasin 2006 (No. Z06-43) the National High Technology Research and Development Program of China (No. 2012AA092302) Specialized research fund for the doctoral program of higher education (No. 20113104110004) Shanghai Municipal Education Commission Innovation Project (No. 12ZZ168) 

主　　题：hook depth longline temperature-depth-recorder equatorial area the Indian Ocean 

摘      要：A survey was conducted in the equatorial area of Indian Ocean for a better understanding of the dynamics of hook depth distribution of pelagic longline fishery. We determined the relationship between hook depth and vertical shear of current coefficieney, wind speed, hook position code, sine of wind angle, sine of angle of attack and weight of messenger weight. We identified the hook depth models by the analysis of covariance with a general linear model. The results showed that the wind effect on the hook depth can be ignored from October to November in the survey area; the surface current effect on the hook depth can be ignored; the equato- rial undercurrent is the key factor for the hook depth in Indian Ocean; and there is a negative correlation between the hook depth and vertical shear of current and angle of attack. It was also found that the deeper the hook was set, the higher hook depth shoaling was. The proposed model improves the accuracy of the prediction of hook depth, which can be used to estimate the vertical distribution of pelagic fish in water column.