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The harbor seals at the WH Aquarium eat 10-15 lbs of fish per day. The grey seals are much larger and obviously eat a lot more.
It doesn't take much of a scientist to figure 10,000 grey seals are eating 50-100,000 lbs of fish a day. That translates into 2-4 million lbs of fish per year. That is a lot and it is not very likely they are making do on sand eels and sand dabs.
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