Temporal changes in behavioural responses and serum metabolites of Cirrhinus mrigala exposed to acute hypoxia
J Environ Biol
;
2019 Jul; 40(4): 641-647
Article
| IMSEAR
| ID: sea-214601
ABSTRACT
Aim:
The present study was conducted to determine the tolerance to reduced oxygen level (hypoxia) and the behavioural and biochemical responses of mrigal, Cirrhinus mrigala to environmental hypoxia.Methodology:
Cirrhinus mrigala were subjected to LC50 test for 96 hr and the mortality were recorded. In a second experiment, the fishes were subjected to a stressful, but safe limit of hypoxia (0.5±0.04 mg l-1) and the behavioral responses and serum metabolites (glucose, lactate, total lipids, free amino acids and ammonia) were evaluated for 96 hrs.Results:
A median lethal concentration (LC50, 96 hr) value of 0.25 mg l-1dissolved oxygen) was estimated for mrigal. The upper safe limit was 0.49 mg l-1 DO and the lower lethal limit was 0.19 mg l-1 DO. Gill ventilation frequency increased under severe hypoxic conditions and decreased with exposure time. The serum level of glucose, lactate and total lipids increased significantly (P<0.05) within 24 hr of exposure to hypoxic conditions. Free amino acids and ammonia contents were not altered by a four day exposure to hypoxia.Interpretation:
The present study explains the basic metabolic and behavioural mechanism behind the hypoxia tolerance of Indian Major Carp, mrigal assisted by alterations in gill ventilation and metabolic responses.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Journal:
J Environ Biol
Year:
2019
Type:
Article
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