Q.80
Characteristic cortisol elevations of fishes in response to acute stressors generally tend to range within the following limit with
a few notable exceptions.
- Primary Endocrine Stress Response:
- In teleosts, acute stress triggers activation of the Hypothalamic-Pituitary-Interrenal (HPI) axis: hypothalamic CRH stimulates pituitary ACTH release, triggering the interrenal tissue to synthesize and secrete cortisol.
- Basal vs Stressed Titer:
- Basal resting levels in undisturbed teleosts: $\lt 5 - 10\text{ ng/ml}$.
- Following acute stress exposure (netting, crowding, confinement), plasma cortisol elevates rapidly, typically peaking within $30 - 120\text{ minutes}$ in the range of $30 - 300\text{ ng/ml}$ (commonly $50 - 200\text{ ng/ml}$ in salmonids, carps, and bass).
- nalysis:
- (30-300 ng/ml): Correct standard physiological acute range.
Correct option: (3) 30-300 ng/ml
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