My apartment overlooks the Cuyahoga River in Cleveland. The other morning I looked out at the river and it seemed to be icing over. But it didn’t look right and it wasn’t cold enough for it to ice over. I got the binoculars out and looked closer. The white sheets I saw were dead fish; millions of them floating slowly down the river like a white carpet. The fish are actually Gizzard Shad, a member of the fesh water herring family. They are not native to the region but migrated to Lake Erie up the Ohio & Erie Canal. They cannot tolerate rapid changes in temperature, so a cold spell followed by a warmer spell kills them off.

You’d think the seagulls would be in fish heaven but there is no sign of them feasting on the Cuyahoga’s largesse. The first picture shows the white carpet of fish.
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Here’s a close-up of the leading edge of the mass of fish.
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