Air Temperature and Emersion Time Can Affect the Survival Rate and Ammonium Loading of Swimming Crab Portunus trituberculatus Exposed to Air

作     者：LU Yunliang ZHU Boshan ZHANG Dan LI Yuquan LU Yunliang;ZHU Boshan;ZHANG Dan;LI Yuquan

作者机构：Marine Science and Engineering CollegeQingdao Agricultural UniversityQingdao 266109China Key Laboratory of Mariculture of Ministry of EducationOcean University of ChinaQingdao 266003China Function Laboratory for Marine Fisheries Science and Food Production ProcessesQingdao National Laboratory for Marine Science and TechnologyQingdao 266235China Tianjin Key Laboratory of Aqua-Ecology and AquacultureFisheries CollegeTianjin Agricultural UniversityTianjin 300384China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2020年第19卷第3期

页      面：643-652页

核心收录：

学科分类：090801[农学-水产养殖] 0908[农学-水产] 09[农学] 

基　　金：supported by the National Natural Science Foundation of China (No.31972784) the Shandong Province Natural Science Fund Project (No.ZR2018M C028) the High-level Talents Research Fund of Qingdao Agricultural University (No.663/1119032) the Scientific Research Project of Tianjin Education Commission (No.2017KJ186) the Shrimp & Crab Innovation Team of Shandong Agriculture Research System (No.SDAIT-15-011) the 'First Class Fishery Discipline' programme in Shandong Province, China Marine and Fishery Science and Technology Innovation Project of Shandong Province (No.2017YY20) 

主　　题：Portunus trituberculatus air temperature emersion time ammonium loading 

摘      要：Ammonium overloading is a common response of aquatic organisms to air exposure during transport. This study elucidated the relationship between ammonium overloading and mortality of crab Portunus trituberculatus. Additionally, we also explored the effects of emersion time and air temperature on ammonium loading and concomitant physiological change. To test the air temperature effect, the crab was exposed to 16, 23 and 30℃ in air for 3 h, respectively, and then recovered in seawater at 23℃ for 12 h. To test the emersion time effect, crab was exposed to 23℃ in air for 0.5 and 3 h, respectively, and then recovered in seawater at 23℃ for 12 h. In the control group, crab was always immersed at 23℃. At each time interval(0.5, 1.5 and 3 h during air exposure and 0.5, 2, 4 and 12 h during recovery), ammonium excretion rate, level of total ammonium, total free amino acids and urea concentration in hemolymph and the hepatopancreas enzyme activity involved in detoxifying ammonium were analysed. Results showed that crab mortality was positively related with emersion time and temperature while ammonium loading was lower at 16 and 30℃ than at 23℃. For crab experiencing thermal inconsistence of culture media(i.e., 16 or 30℃), they were higher in ammonium excretion rate and activities of ammonium detoxification enzymes, which may be the reason that they had a lower ammonium loading. Prolonged emersion time(3.0 h vs. 0.5 h) increased the ammonium overloading and the activity of ammonium detoxification pathways in crab. Our results demonstrated that emersion-induced ammonium overloading may not be the main reason leading to P. trituberculatus death during air exposure and subsequent recovery. When the culture medium changed, thermal variation, compared with constant temperature, could reduce ammonium overloading in crab by elevating the activities of ammonium detoxification enzymes and ammonium excretion rate during recovery period.