What is the biological impact of minimum catch sizes on a population of fish?
a. the population comes to be dominated by smaller, slower-growing individuals.
b. older, less productive adults are removed, improving the populations health.
c. it applies a selective pressure for larger, faster growing fish.
d. the fish in the population produce more and healthier eggs to compensate?

Option A, the population comes to be dominated by smaller, slower-growing individuals

Explanation:

The minimum catch size defines the size of the fishes so that the fish having size smaller than the “Minimum catch Size” should not be considered for fishing.

This mechanism is used to regulate the population of small fishes so that they can get enough time to mature and increase in both number and size.  

This is done by resizing the fishing net or fishing hooks.

Hence option A is correct.

which fault and or fold did you find most difficult to diagram