The butter clam has one set of rings that go one direction only, around the same center point (Photo courtesy of Alaska Department of Environmental Conservation)

Published at 224 × 176 in • Paralytic shellfish poisoning (PSP) warning issued for Southeast Alaska
The butter clam has one set of rings that go one direction only, around the same center point (Photo courtesy of Alaska Department of Environmental Conservation)

The butter clam has one set of rings that go one direction only, around the same center point (Photo courtesy of Alaska Department of Environmental Conservation)

The butter clam has one set of rings that go one direction only, around the same center point (Photo courtesy of Alaska Department of Environmental Conservation)

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