Some students, during a study, caught, marked and released 80 fishes in a pond. Later 100 fishes were caught at random. Among these 40 were found to be marked. What is the approximate number of fishes

Question

Some students, during a study, caught, marked and released 80 fishes in a pond. Later 100 fishes were caught at random. Among these 40 were found to be marked. What is the approximate number of fishes in the pond?

TestHub · Accepted Answer

According to Petersons Mark and Recapture Method, the population (P) is given by P = m ( r + u ) / r where m = number of marked fishes r = number of marked fishes recaptured u = number of unmarked fishes captured Here, m r u P P ​ = 80 = 40 = ( 100 − 40 ) = 60 = m ( r + u ) / r = 40 80 ( 40 + 60 ) ​ = 200 ​

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