In Fishery Science, a Cohort Is the Collection of Fish

Multiple Choice

In fishery science, a cohort is the collection of fish that results from one annual reproduction. It is usually assumed that the number of fish N( t ) still alive after t years is given by an exponential function. For Pacific halibut, , where N _o is the initial size of the cohort. Approximate the percentage of the original number still alive after 9 years.

A) 5.5%
B) 50.4%
C) 33.1%
D) 16.5%
E) 18.0%