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State of New Jersey Department of Environmental Protection
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Fish Monitoring Sections

 


Bureau of Freshwater & Biological Monitoring

Northern Fish IBI

(High Gradient)

The Fish IBI data is used in concert with available macroinvertebrate data to assess the status of aquatic life designated use in state waters as required by the CWA section 305(b) 106 (e) (1). These data are used to identify impaired waters under section 303(d) 106 (e) (1). The data help to measure water quality use attainment and the Department's success in attaining the Clean Water Act goal of "fishable" waters as elaborated in the New Jersey Integrated Water Quality Assessment Report.

The northern fish IBI uses resident fish communities to measure the health of high gradient wadeable streams north of the fall line which are greater than 4 square miles in drainage size.  Fish assemblage analysis is accomplished using a regional modification of the original IBI (Karr 1981), developed by Kurtenbach (1994) and later recalibrated by the Bureau of Freshwater and Biological Monitoring (BFBM) (2005; 2013).

The IBI incorporates richness, trophic composition, abundance, and overall health of the fish assemblage into a single ecologically based index. The index is comprised of several attributes (metrics) of a healthy fish assemblage, which are selected based on their sensitivity to anthropogenic impacts.  Each metric is scored based on its deviation from reference condition.  Metrics are averaged to generate an overall score and rating for each stream sampled.

 

nibi region map



If you are interested in more information about the Northern Fish IBI, please contact John Vile at 609-292-0427.

large brown trout in livewell

brown trout on measuring board

chain pickerel on measuring board

furnace brook

northern pike passaic river

brown trout mulhockaway creek

clinton brook


Photo credits - NJDEP

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Last Updated: August 10, 2017