[IB Biology Ecology Reviews]


5. In a mark-recapture study of a lake trout population, 40 fish were captured, marked, and relased. in a second capture, 45 fish were captured; 9 of these were marked. What is the estimated number of individuals in the lake trout population?

a. 90

b. 200

c. 360

d. 800

e. 1800

The best answer is b, 200 individual fish.

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