不同温度下蒙古鲌幼鱼耗氧率和窒息点探究OA

Water temperature is a key environmental factor influencing fish metabolism and survival.Erythroculter mongolicus is an economically important freshwater fish species in China.Understanding the adaptability of its ju-veniles to water temperature and dissolved oxygen is crucial for aquaculture and transportation practices.In this study,the static closed respiratory chamber method was used to systematically determine the oxygen consumption rate and asphyxiation point of juvenile E.mongolicus(Body weight(1.86±0.21)g,24 fish per temperature group)at three temperature gradients:20℃,25℃,and 30℃.The results showed that as water temperature increased,both the oxygen consumption rate and asphyxiation point of the juveniles significantly increased.At 30℃,the oxy-gen consumption rate and asphyxiation point were(0.218±0.014)mg/(g·h)and(0.46±0.06)mg/L,respec-tively,which were significantly higher than those at 20℃and 25℃(P<0.05).The time until all juveniles died decreased with increasing temperature,with recorded durations of 185 min,138 min,and 63 min at 20℃,25℃,and 30℃,respectively.Therefore,in aquaculture and transportation,dissolved oxygen levels should be regulated promptly according to water temperature,and stocking density should be managed appropriately to enhance juvenile survival and economic efficiency.