A marine biologist is monitoring the population of the spiny lobster ($Palinurus\; elephas$) around a rocky reef using the mark-release-recapture technique.

In the initial survey, the biologist captures, tags, and releases $96$ lobsters.

Three weeks later, a second survey is conducted in which $80$ lobsters are captured from the same reef area. The biologist calculates that the estimated total population size of spiny lobsters in this reef area is $640$.