The Hilsenhoff Biotic Index values for macroinvertebrate families in all other tributaries ranged from 10 for Shenandoah Creek at Lost Creek to 3.76 for Schwaben Creek; lower values are ideal ( values under 3.75 are considered " excellent ", while values over 7.25 are considered " very poor " ).
32.
The study also found that the Fonteyn Kill's score on the Hilsenhoff family biotic index ( HBI ), a scale measuring pollution based on the tolerance of endemic benthic macroinvertebrates, was approximately six, indicating fairly poor water quality, with scores for the rest of the Casperkill Fonteyn Kill watershed were as high as seven ( poor water quality ) to as low as four ( very good water quality ) . { N }, where " n i " is the number of taxa " i " collected, " a i " is the tolerance value for taxon " i ", and " N " is the total number of sampled specimens.
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