Comparative studies on age identification materials for Gymnodiptychus pachycheilus from the middle reaches of Yalong River

• WAN Zhuokun, 
• GAN Weixiong, 
• ZHAO Chunxian, 
• ZENG Rukui, 
• DING Yuwei, 
• LI Tiancai, 
• FENG Xue, 
• BAI Yunpeng, 
• FU Mei, 
• YAO Weizhi, 
• LÜ Hongjian