Seattle's osprey population has been declining in recent years, primarily because of hunting, both legal and illegal. Osprey prey heavily on salmon, yet the naturally occurring population of salmon has also declined, even though the annual number caught for human consumption has not increased.
Which of the following, if true, most helps to explain the decline in the population of the salmon?
【选项】
A primary predator of salmon is the American eel, on which osprey also prey.
选项是否正确？