Algebra-1

We can solve this problem using the concept of exponential growth.

Step 1: Identify the exponential growth formula and relevant variables

The general formula for exponential growth in this situation is , where:

 is the final number of fish.

 is the initial number of fish, which is  in this case.

 is the growth factor per year (since the population triples every year, ).

 is the number of years passed, which is  years in this problem.

Step 2: Plug the values into the formula and calculate

We know that ,