Beneficial Use Impairment 4:
Fish Tumors or Other Deformities
What the delisting guidance says -
Progress toward delisting
Further sampling is necessary.
Recent ODNR fish sampling in ship channel showed a few DELTs on captured flathead, channel catfish and pumpkinseed.
Pending sediment remediation in the Old River Channel is targeted at reducing brown bullhead liver tumors, and
followup monitoring will be required.
The impairment will be considered for delisting when:
The average DELT values within the assessment unit do not exceed either:
Where brown bullheads are present, the liver tumor prevalence rate (i.e., neoplastic or preneoplastic liver tumors) should not exceed 5%.
Two studies are currently underway to determine the background rates for tumor and deformity incidence rates in Ohio AOCs. Once the studies are complete, Ohio EPA will review the results and determine if the current target should be revised.
Brown bullhead liver tumor prevalence rates are evaluated in specified stream reaches within the AOC where populations are likely to be present.
Ohio EPA has identified the lacustuary zones of the following streams and reaches in the Cuyahoga River AOC for the evaluation of brown bullhead liver tumor incidence rates:
ii. Old Channel
iii. Euclid Creek
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