Pond Boss Forums AQUATIC VEGETATION Identifying plants Is this blue green algae?

That is primarily bluegreen mat forming algae with a few green algae filaments mixed in that typically grows on bare mud bottoms of relatively new ponds. I often call it mud puddle algae. Older ponds with accumulated organic sediments usually do not get lots of this type of algae. When you killed all or most all the weeds with sonar this heavily reduced the amount of competition for space on the bottom. Bottom sediments are rich in nutrients and production of nutrients. Then the current bluegreen mats could flourish when there was minimal vegetation competition on the bottom. The new current problem will be harder to fix than the first weed problem because it is resistant to most herbicides/algacides.