Studies On Salinity Adaptability And Dietary Lipid Requirement In Juvenile Amur Sturgeon (Acipenser Schrenckii)

1 Effects of different methods of salinity acclimation on growth in Juvenile Amur sturgeon Acipenser schrenckiiJuveniles A. schrenckii (11.32±3.48g) were acclimated to salinity using three different methods, which are: Increasing salinity gradually (IG), Increasing salinity termly (IT), Increasing salinity suddenly (IS). The results showed that acclimation methods affected survival rate of Juveniles. The survival rate is highest in IT(100%), then in IS(93.33%) and lowest in IG(85%). There are different numbers of "Big Head Fish" at each method, and the dead fishes were always "BHF". The specific growth rate (SGR) were statistically analyzed and compared to the control group. The results showed that, at the end of this trial, SGRs of Juveniles acclimated to salinity at these three different methods were lower than which reared in freshwater(P<0.05), and the SGR of Juveniles at IT were the lowest one in three methods. It is clearly indicated that salinity acclimation restrained growth in Juvenile A. schrenckii, and mainly attributed to stress of salinity and the increasing energetic costs for osmolarity balance with Juvenile in higher salinity. At the last 30 days while Juveniles under salinity 25, fish growth did not decrease. In conclusion, all these three methods can be used for salinity acclimation of A. schrenckii. Comparing to Increasing salinity gradually (IG), Increasing salinity termly (IT) and Increasing salinity suddenly (IS) gains better survival rate or better growth, are better way for acclimating Amur sturgeon to seawater.2 Oxygen consumption and Asphyxiation point of Juvenile Acipenser schrenckii acclimated to sea waterJuvenile Amur sturgeon (A. schrenckii) (74.33±13.46g), which were acclimated to sea water (salinity 28) up to 14 days and reared in fresh water, at 20.0 ±0.2℃, were sampled and investigated for oxygen consumption rate and asphyxiation point. Average oxygen consumption rate(OCR) of fish in seawater (235.10±37.70 mgO₂ kg^-1·h^-1) was significantly higher than those in freshwater(202.20±30.12mgO₂kg^-1·h^-1)...