Benthos and Fish Tumour BUI Assessment Reports

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We want to know what you think about the recommendation by the Detroit River Canadian Cleanup to change the status of the (1) Degradation of Benthos beneficial use impairment (BUI), and (2) Fish Tumours and other Deformities beneficial use impairment. Your input is valuable to us and is much appreciated.

The two assessment reports on which this recommendation is based and the fact sheets associated with these reports can be found below. These reports will provide you with all information required to provide comments on the proposed re-designation.

Degradation of Benthos

Benthos are bottom-dwelling organisms of lakes, streams and rivers that depend on water for a portion of their life.  Benthos communities have been negatively affected by pollution and sediment contamination in the Detroit River for decades. This contributed to the benthos communities in the Detroit River being considered “impaired”. However, recent research indicates that in the Detroit River, sediment contamination has decreased, bioaccumulation potential is minimal, and benthic community composition in most sites is similar to reference sites, indicating improved conditions for benthos within the river. Based on this research, it is recommended that the status of the Degradation of Benthos beneficial use impairment be changed from “impaired” to “not impaired”.

Technical report: Assessment of the Degradation of Benthos Beneficial Use Impairment in Canadian Waters

Fact sheets: (1) Re-designation of the Degradation of Benthos Beneficial Use Impairment

(2) Re-designation of the Degradation of Benthos BUI Report Concepts & Methods

Fish Tumours and other Deformities

In the 1980s, internal and external tumours and deformities in fish in the Detroit River were found at elevated rates. These deformities can be caused by pollution and sediment contamination. Through legislation and better management practices, sediment contamination in and pollution discharges to the river have decreased. As a result, recent research indicates that liver tumours have decreased over time with 1 out of 112 (<1%) fish analyzed having a liver tumour. 2% is the Great Lakes reference rate for such tumours.  Based on this research, it is recommended that the status of the fish tumour and other deformities beneficial use impairment for the Detroit River be redesignated to ‘not impaired’.

Technical report: Beneficial Use Assessment for BUI #4: Fish Tumours or Other Deformities in the Detroit River Area of Concern

Fact sheet: Re-designation of the Fish Tumour and other Deformities Beneficial Use Impairment


All comments received will be reviewed and addressed by the Detroit River Area of Concern Remedial Action Plan members. All comments will be included in a summary report (which will be created after the deadline passes) to inform stakeholders about the public’s opinions towards the proposed status change of the BUIs. The deadline to submit comments is August 30, 2019.

We expect the comment form to take no longer than 5 minutes to complete. If you have any questions or concerns please contact Jacqueline Serran at postmaster@detroitriver.ca or at 519-776-5209 ext. 356.


 

 

 

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