Comparative study on credibility of fishing information of electronic fishing logs of trawlers and fishing information acquired by Beidou position data

To analyze the accuracy and credibility of electronic fishing log data, we extracted and analyzed the fishing time, fishing hauls and fishing area of five trawlers ('Yuexinhui fishing 01282', 'Yuexinhui fishing 01240', 'Yuexinhui fishing 01286', 'Yuexinhui fishing 01239', 'Yuemaobin fishing 47239', 'Yuexinhui fishing 02163', 'Yuemaobin fishing 42278', 'Yuexinhui fishing 00070' and 'Yuexinhui fishing 01268') from August 17, 2018 to April 30, 2019 by Beidou position data, and then compared them with relevant information of electronic fishing logs data. The repetition rates of five trawlers extracted from the electronic fishing logs data and Beidou position data were 36.7%, 64.8%, 71.4%, 81.5%, 24.7%, 46.7%, 66.7%, 79.6% and 68.9%, respectively. The repetition rates of fishing areas were 80%, 86.9%, 65.7%, 74.7%, 75.3%, 85.6%, 71.6%, 56.9% and 65.2%, respectively. The repetition rate of fishing hauls were 65%, 86.4%, 60%, 70%, 75.3%, 67.1%, 54.4%, 62.1% and 35.4%, respectively. The correlation analysis between fishing time and catches shows that the fishing time of 'Yuexinhui fishing 01282', 'Yuexinhui fishing 01240', 'Yuexinhui fishing 01239' and 'Yuemaobin fishing 47239' correlated with catches very significantly (P<0.01); the fishing time of 'Yuemaobin fishing 42278' correlated with catches significantly (P<0.05); the fishing time of 'Yuexinhui fishing 01282', 'Yuexinhui fishing 01286', 'Yuexinhui fishing 00070' and 'Yuexinhui fishing 01268' had no significant correlation with catches (P>0.05), which reflects that the accuracy and feasibility of electronic fishing logs data still need to be improved.