Q.9
Given below are two statements
Statement (I) : Fish can exhibit a cumulative response to repeated stressors.
Statement (II) : Repeated exposures to mild stressors can attenuate the neuroendocrine and metabolic responses to
subsequent exposure to stressors.
In light of the above statements, choose the most appropriate answer from the options given below.
- Evaluation of Statements on Fish Stress Physiology:
- Statement I: Fish can exhibit a cumulative response to repeated stressors.
- True. Repeated or chronic exposure to consecutive acute stressors (handling, hypoxia, temperature spikes) leads to cumulative physiological wear-and-tear (allostatic load), potentially progressing to tertiary stress responses including suppressed immunity, impaired growth, and reproductive arrest.
- Statement II: Repeated exposures to mild stressors can attenuate the neuroendocrine and metabolic responses to subsequent exposure to stressors.
- True. Habituation (stress conditioning / hormesis) occurs when fish repeatedly encounter mild, non-lethal stressors, resulting in diminished Hypothalamic-Pituitary-Interrenal (HPI) activation, reduced cortisol surges, and faster metabolic recovery.
- nalysis:
- (Both Statement (I) and Statement (II) are correct): Correct.
Correct option: (1) Both Statement (I) and Statement (II) are correct
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