What are these bubbles all over the lake?

bubbles on a lakeThe Question: In early June, I took a kayak trip on Winton Lake, starting out before sunrise and getting to the area where these photos were taken just as the sun was coming up. There were green bubbles all over the lake. After the sun came up, they began to break up and were gone within about an hour after sunrise. I’ve never seen anything like this on any lake I’ve ever paddled and I’m very curious what could cause it! Can you supply any answers?
Submitted by: Mark, Ohio, USA

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