2.1 | Fish sampling
Ten individual fish for each species (Ctenopharyngodon idellus ,Siniperca chuatsi , Carassius auratus andSchizothorax grahami ) were caught by trolling boats in the Dianchi Lake, Kunming, Yunan, China. The fish were transported live in plastic bags provided with dissolved oxygen by car to the Aquaculture Laboratory of Yunnan Agricultural University, where they were euthanized by immersing them into 40 mg/L eugenol (Shanghai Reagent, China). The average weights of the sampled fish were determined by using a weighing scale as 1323.60 ± 40.20 g for C. idellus , 471.10 ± 23.94 for S. grahami , 841.30 ± 34.54 g for S. chuatsi and 350.4 ± 25.98 g for C. auratus .