scholarly journals Oxygen consumption, ammonium excretion and osmoregulatory capacity of Litopenaeus stylirostris (Stimpson) exposed to different combinations of temperature and salinity

2004 ◽  
Vol 30 (3) ◽  
pp. 443-453 ◽  
Author(s):  
A Denisse-Re
Keyword(s):  
Oxygen Consumption ◽  
Ammonium Excretion ◽  
Osmoregulatory Capacity

scholarly journals Acute and sub-chronic effects of copper on survival, respiratory metabolism, and metal accumulation in Cambaroides dauricus

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jie Bao ◽  
Yuenan Xing ◽  
Chengcheng Feng ◽  
Shiyu Kou ◽  
Hongbo Jiang ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Trace Metal ◽  
Environmental Pollution ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Excretion Rate ◽  
Ammonium Excretion ◽  
Respiratory Metabolism ◽  
O:N Ratio ◽  
Cu Accumulation

Abstract Trace metal contamination in the aquatic ecosystem occurs worldwide: although copper is an essential trace metal, it is considered as a pollutant at certain levels in China. Freshwater crayfish Cambaroides dauricus is a commercially important wild species in northeastern China, in which is an important heavy industry area. The population of C. dauricus was decreasing sharply due to the environmental pollution and human intervention over the past 20 years. However, nothing is known regarding the responses of this species to trace metal toxicants. This study aimed to determine the acute and chronic toxicity of Cu and its toxicological effects on respiratory metabolism, as well as Cu accumulation in C. dauricus. The acute (96 h) median lethal concentration (LC50) value of 32.5 mg/L was detected in C. dauricus. Then, acute (96 h; 8.24, 16.48 mg/L) and sub-chronic (14 days; 2.06, 4.12 mg/L) exposure in Cu was investigated by estimating the oxygen consumption rate, ammonium excretion rate, and Cu accumulation. Both acute and sub-chronic Cu exposure induced an inhibition of the oxygen consumption rate and ammonium excretion rate, and thereby, an increased O:N ratio. The shift in O:N ratio indicated a metabolic substrate shift towards lipid and carbohydrate metabolism under Cu stress. Cu accumulation in the hepatopancreas and muscles throughout the study was found to be time-dependent and concentration-dependent. The maximum accumulation in the hepatopancreas and muscle were almost 31.6 folds of the control after 14 days’ exposure to 4.12 mg/L concentration. Based on the present work, we suggest that crayfish be considered a potential bioindicator of environmental pollution in freshwater systems. The study provides basic information for further understanding of the toxicological responses of this species to trace metals.

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