Question:
Which method is used to calculate fish population in a water body?
Which method is used to calculate fish population in a water body?
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Population estimate → Mark-Recapture.
Updated On: Jul 2, 2026
- Mark and Recapture
- Transect Sampling
- Quadrat Method
- Radiography
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The Correct Option is A
Approach Solution - 1
Step 1: Mark and Recapture is standard to estimate fish stock size.
Step 2: Fish are caught, marked, released, and recaptured to get a proportion.
Step 3: Transects & quadrats for plants/benthic fauna. Radiography is unrelated.
Step 2: Fish are caught, marked, released, and recaptured to get a proportion.
Step 3: Transects & quadrats for plants/benthic fauna. Radiography is unrelated.
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Approach Solution -2
Method-to-Target Match: Population estimation methods are matched to what's being counted — mobile animals need a different method than stationary organisms.
Mark and Recapture works specifically for mobile populations like fish: catch, tag, release, then recapture and calculate population from the recapture ratio.
Transect and Quadrat sampling are designed for STATIONARY organisms (plants, benthic fauna) that don't move, and radiography is an imaging tool, unrelated to population counting.
Mark and Recapture works specifically for mobile populations like fish: catch, tag, release, then recapture and calculate population from the recapture ratio.
Transect and Quadrat sampling are designed for STATIONARY organisms (plants, benthic fauna) that don't move, and radiography is an imaging tool, unrelated to population counting.
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