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.