ANGUILLA AUSTRALIS RESEARCH ON BIOLOGICAL TOLERANCE BASED ON SEAWATER
Anguilla australis is a migratory fish species.To explore its biological tolerance to seawater,this study focused on fingerling eel,juvenile eel and yellow eel of A.australis at different growth stages.Under seawater conditions,tolerance tests were conducted on ecological factors such as oxygen consumption rate,asphyxiation point,water temperature,pH,non-ionic ammonia,nitrite and salinity.The results showed that the daytime and nighttime oxygen consumption rates of fingerling eel,juvenile eel,and yellow eel decreased with increasing body weight,but there were significant differences between day and night(P＜0.05).The dissolved oxygen concentration at the asphyxiation point of fingerling eel,juvenile eel and yellow eel decreases with increasing body weight.3～35 ° C is the optimal seawater temperature range for A.australis,25～29 ℃ is the optimal growth temperature for fingerling eel,and 23～29 ℃ is the optimal growth temperature for juvenile eel and yellow eel.The tolerance to water temperature increases with increasing body weight.The suitable salinity range for A.australis is 0～36,with 0～36 being the optimal growth salinity for fingerling eel,0～30 is the suitable salinity for juvenile and yellow eel.Fingerling eel have a wider tolerance to salinity than juvenile eel and yellow eel.A.australis can survive in the pH range of 4.0～10.0.The LC50 of non-ionic ammonia in water for fingerling eel,juvenile eel and yellow eels are 3.00,1.76 and 1.28 mg/L,respectively,with safe concentrations of 0.30,0.18 and 0.13 mg/L.Fingerling eel have the strongest tolerance.The LC50of nitrite nitrogen on fingerling eel,juvenile eel and yellow eels are 66.93,825.18 and 1 001.77 mg/L,respectively,with safe concentrations of 6.69,82.52 and 100.18 mg/L.
万方数据
维普
