Mark and Recapture Method Problem Ecologists are interested in the fish populati

ID: 91155 • Letter: M

Question

Mark and Recapture Method Problem

Ecologists are interested in the fish population in a pond. (Counts given)

Using a net, trap some fish in the pond.

Count the number of trapped individuals and mark them with a tag – M1 (300)

Return these to the pond so they can mix back in with the rest of the fish population

Trap individuals a second time and count them – some will be unmarked – M2 (250)

some will be marked – Mr (45)

Calculate the population density estimation of the number of fish in the population.

Use the numbers given (in red) to calculate:

Estimated fish population = ____________

Our study is taking place in a 20 acre pond.

Population density = __________________

Ans: Estimated fish population= 300/45*100 = 667

for Population density

population density = number of people / land area

converting acre into square miles

100 acre = 0.157 square miles

667/0.157 = 4248 fish/square miles.

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