Upgraded rivers

I think rivers should have some borders around them using course dirt and mud. This would help to make a border around rivers instead of just grass on the border of rivers. On the mud and dirt would be some sugar cane and some other vegetation for example reeds. Rivers would have some new varieties of fish because right now Minecraft only has Cod and Salmon in the rivers. I think this would make rivers more unique and look a bit more natural by having muddy banks and more fish. There could also be some crustaceans.