Macro-invertebrates

Benthic macro-invertebrates are invertebrates (or animals without a backbone) that live on the bottom of streams during all or part of their life cycle. Their name sounds complicated, but it literally describes these creatures. "Benthic" means bottom dwelling, and "macro" indicates that benthic macro-invertebrates can be seen with the naked eye. Although benthic macro-invertebrates (BMI´s) often go unnoticed because of their size and habitat, they are an extremely important part of river ecosystems, and serve as a link in the food web between decomposing leaves and algae, and fish and other vertebrates.  (http://www.naparcd.org/benthicmacro.htm)

Water Quality 
Excellent 1.0-2.0
Good 2.1-2.5
Fair 2.6-3.5
Poor greater than 3.6


THE HEALTHIEST RIVER BASED ON THE RESULTS IS: CHICAGO RIVER

Click on the screen above to feed the fishes


Chicago River

 2.3 +/- 0.2 (2.1-2.4)


Sava River

The Sava River is a healthy river because the surrounding areas have many animals significant to the nature. If the birds live in that environment they need to feed on something; therefore, the river has to contain a lot of food to support the animals.