Imagine there is a new species specific fishing regulation that mandates only adult fish of this species that are 75 cm or longer may be kept and shorter fish must be released. Based on your knowledge of natural selection, you would predict that the average length of the adult fish population will...
-gradually decline (over many generations) True or False

True.

Explanation:

Natural selection may be defined as the process by which the organism are selected by the nature and adapt in the environment. Darwin explains the theory of natural selection.

In the given situation, the adult fish is kept but over time, the population of the adult fish declines over time. To maintains the population of adult fish, the mutation might occur in nature that reduces the size of the fish and naturally select the fish, fishes increase their number and changes their characteristics according to the environment. The average length of the adult population decline by the process of natural selection.

Thus, the correct answer is true.