Final answer:
The Osea cucumbers have suffered a drastic decrease in population due to overfishing.
Step-by-step explanation:
The animal that has suffered a drastic decrease in its population due to overfishing is the Osea cucumbers. Overfishing occurs when a species is caught at a rate faster than it can reproduce, leading to a decline in population. This is a major concern as Osea cucumbers play an important role in maintaining the health and balance of marine ecosystems.
Learn more about Overfishing's impact on Osea cucumbers