Feeding habit and trophic niche of purpleback flying squid (Sthenoteuthis oualaniensis) in the Nansha Islands area, South China Sea

• XIE Jiayi, 
• ZHANG Lizi, 
• WU Wenxiu, 
• ZHOU Beihe, 
• CHEN Qiujie, 
• ZHAO Chunxu, 
• HE Xiongbo, 
• XU Jun, 
• YAN Yunrong