Macroinvertebrate Community Index (MCI)

MCI stands for Macroinvertebrate Community Index which is an indicator of general river health: excellent >119; good 100-119; fair 80-99; poor <80.

It is a qualitative sampling method, which means it will tell you which species are present or absent in your sample. If you want to know the abundance (i.e., how many) of a certain species are in your sample, you will need to use the Quantitative MCI (QMCI) sampling methodology.

View a factsheet on Benthic macroinvertebrates