Analysis of pigmentation characteristics on beak of Berryteuthis magister shevtsovi in the Japan Sea based on artificial neural networks

• ZHU Wenbin, 
• CHEN Xuanyu, 
• LU Huajie, 
• CHEN Ziyue, 
• NING Xin, 
• CUI Guochen, 
• GUO Ai, 
• CHEN Xinjun