Lately, there has been a lot of Toxic Algae in our waterways this is very bad for our environment it effect us a lot here are some reasons, we can no longer swin in rivers safely without getting sick. it also affects some fishes that live in waterways, as they think it is food and tries to eat it, theu could get very sick or even die, 

How To Help kill blue-green algae: herbicide or algaecide may kill the blue-green algae. That might be a good way to help the community out.

If the herbicides get into the waterways witch it will then the fish will not get harmed as we have found out that it is non-toxic towards fish. 

Rock snot/Didymo: rock snot originally grew from Europe and the northwest USA. It is very bad for the waterways as it clogs up rivers and streams and also kills a lot of fish. It has started to spread around the world, It got here from Canada from the bottom of the boats and on people's shoes.

Now to help get rid of Algae. Plant aquatic plants in your Pond/River to help decrease it. Don't feed the fish in the river as the leftovers will mold, and will attract algae.