Introduction to Marine Biology 3rd Edition by George Karleskint, Richard Turner, James Small

Exercise 3

A sample of 50 tuna is captured, tagged, and released back into the population. Four weeks later, another sample of 50 tuna is taken and 10 of them have tags. Based on this information, we would estimate the size of the tuna population in this range to be
A) 100 tuna
B) 200 tuna
C) 250 tuna
D) 500 tuna
E) 1,000 tuna