What is the health of the stream as indicated by the freshwater biodiversity? 

The Hawaiian Stream Index of Biological Integrity (HS-IBI) incorporates 11 metrics covering five ecological categories, and has shown to effectively differentiate relative environmental/habitat quality in streams on all Hawaiian Islands across gradients of human influence, from near-pristine to severely impaired.

To determine biological integrity scores for a given site, counts and measurements of fishes and macro-invertebrates are obtained by either underwater visual census or electrofishing techniques. The sites with the highest native species densities are designated as reference sites and obtain the maximum of 55 points (up to 5 points per metric). Any deviation in native species abundance and distribution, or presence of non-native species will result in lower HS-IBI scores.

To learn more see our 2016 report.


Click on a site below to see what other schools have found at their sites in the watershed. The small triangle on top will allow you to scroll through the sampling dates. Scroll down in the pop-up to see the number of invasives removed and natives returned at that site.