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?

Step-by-step solution

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, aligned m & =80 r & =40 u & =(100-40) & =60 P & = m ( r + u ) / r & = 80(40+60) 40 P & =200 aligned