Ammonia excretion and blood gas variation in naked carp (Gymnocypris przewalskii) exposed to acute hypoxia and high alkalinity
文献类型： 外文期刊
作者： Li, Hang 1 ; Lai, Qifang 1 ; Yao, Zongli 1 ; Liu, Yimeng 1 ; Gao, Pengcheng 1 ; Zhou, Kai 1 ; Sun, Zhen 1 ;
作者机构： 1.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Engn Res Ctr Saline Alkaline Fisheries, Shanghai, Peoples R China
2.Chinese Acad Fisheries Sci, East China Sea Fisheries Res Inst, Sino US Joint Lab Aquat Anim Physiol, Shanghai, Peoples R China
3.Shanghai Ocean Univ, Natl Demonstrat Ctr Expt Fisheries Sci Educ, Shanghai, Peoples R China
关键词： Gymnocypris przewalskii; Ammonia excretion; Hypoxia; Carbonate alkalinity; Blood gas
期刊名称：FISH PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：2.794； 五年影响因子：2.876 ）
ISSN： 0920-1742
年卷期： 2020 年 46 卷 6 期
页码：
收录情况： SCI
摘要： Naked carp (Gymnocypris przewalskii), endemic to the saline-alkaline Lake Qinghai, have the capacity to tolerate combined hypoxia and high alkalinity. This study evaluated the effect of the interaction between carbonate alkalinity and hypoxia on ammonia excretion and blood gas variation in naked carp. Naked carp were subjected to normoxic, hypoxic and reoxygenation phases at two different carbonate alkalinity levels (CA0 = 0 mmol/L; CA32 = 32 mmol/L) for 4 days. The ammonia excretion rate (J(Amm)) of the CA0 group rapidly decreased under hypoxia and recovered under normoxia for four consecutive days. The J(Amm)under CA32 also decreased under hypoxia and recovered to its previous level in the first 2 days. However, the J(Amm)under CA32 was lower than that under CA0. The blood pO(2), sO(2)of CA0 and CA32 group was significantly reduced under hypoxia, after which both groups recovered. Blood pCO(2)of the CA32 group was lower than CA0 throughout the experiment. There were no changes in haematocrit of the naked carp exposed to carbonate alkalinity and hypoxia. The alkaline water increased the pH of the blood and contributed to increased haemoglobin O(2)affinity. Overall, the present findings reveal that naked carp is a tolerant species that can maintain main ionic homeostasis under severe alkalinity and hypoxia. The high alkaline water is beneficial for naked carp to adapt to hypoxic environment.
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