new jersey department of environmental protection  
Water Monitoring & Standards
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Metric 10

Proportion of Individuals with DELT Anomalies

(excluding blackspot disease)


This metric provides a relative measure of the condition of individual fish.

Similar to metric 9, this metric is especially useful in distinguishing streams with serious

water quality impacts. This metric is intended to detect impacts in streams highly

contaminated by chemicals. A significant relationship between the incidence of blackspot

disease and environmental quality has not been established for New Jersey streams. As a

result, blackspot disease is excluded from use in this metric.

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Copyright © State of New Jersey, 1996-2013
Department of Environmental Protection
P. O. Box 402
Trenton, NJ 08625-0402

Last Updated: June 19, 2009

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