In the early 70s there was a large number of harbor seals using Gertrude Island in McNeil Island's Still Harbor. I am sure that those animals were the nucleus for rapid growth in South Sound after the MMPA came into law. Maybe not the only factor but certainly a significant one.
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Remember to immediately record your catch or you may become the catch!

It's the person who has done nothing who is sure nothing can be done. (Ewing)