Final answer:
The fisherman applying selective pressure by taking the most colorful fish for an aquarium will lead to a shift in the lake's fish population towards more muted colors due to artificial selection.
Step-by-step explanation:
If all the fish in the tank are green, describing the probability of Mike winning a giant stuffed animal is unrelated to the situation with the fish. This part of the question seems to be a non sequitur. However, addressing the biological implications of a local fisherman's actions on a fish population is a relevant subject in the context of evolution and biology.
When a fisherman selectively removes the most colorful fish from a lake population for an aquarium, he is applying a form of artificial selection. By doing so, the fisherman is preferentially keeping fish with specific traits, in this case, colorful stripes, which can impact the genetic variability of the population. This scenario reduces the number of individuals that have the genes for bright coloration. Over time, if this action were repeated, the fish population would have fewer carriers of the genes for colorful stripes since these are being removed from the lake. Thus, the remaining population would primarily consist of the dull-colored fish, and these would subsequently reproduce, passing on their muted color traits to their offspring. This process is analogous to what occurred during the domestication of animals and the cultivation of certain plant varieties, where humans have selected for desirable traits, thereby influencing the genetic makeup of future generations. In this lake, unless there is a strong survival advantage to having colorful stripes that outweighs the fisherman's selective pressure, it is likely that the population will become increasingly dominated by individuals with less prominent coloration.