Just twenty years ago, the word "hyper-eutrophic" barely existed. Today, it's commonplace among environmental service providers and people who manage water. In 1972, about 15% of water was eutrophic, meaning it was "nutrient-rich" and thus vulnerable to harmful algae blooms. Today, at least 55% of fresh water in the United States is nutrient-impaired, and a sizable fraction of this volume is hypereutrophic. 

 

https://www.bassresource.com/fish_biology/methane-ponds.html

I keep inviting folks to fish at my pond and keep fish to eat...and I'm thankful it has acres of wetlands.

I'm very thankful that NC is mostly wetland filters in and out of reservoirs but I'm definitely very intrigued by all of this especially for small older ponds with lots of sludge etc