Osprey Prey

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Seattle's osprey population has been declining in recent years, primarily because of hunting, both legal and illegal. Osprey prey heavily on salmon, a fish that is prized as food by the coastal population, who had hoped at least that the decline in the osprey population would lead to an increase in salmon for human consumption. 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?