Analysis of spatiotemporal fish density distribution and its influential factors based on generalized additive model (GAM) in the Yangtze River estuary

• MA Jin, 
• HUANG Jinling, 
• CHEN Jinhui, 
• LI Bai, 
• ZHAO Jing, 
• GAO Chunxia, 
• WANG Xuefang, 
• TIAN Siquan