Redside Dace

red-side dace

(Clinostomus elongates)


  • Adults are a silvery colour with red sides and a purple sheen, particularly in males
  • Grow to about 11 cm in length and have an unusually large mouth for a minnow
  • Prefer clear, cool streams with rubble and gravel bottom and a mix of pools and riffles


Endangered Provincially and Nationally


Patchy distribution around Great Lakes Basin, reaching as far west as Minnesota, south to Kentucky and West Virginia, and east to New York State. In Canada, occurs only in southern Ontario streams that flow into lakes Ontario, Erie and Huron. (ROM)


Most significant threat is urban and agricultural development which causes habitat loss and degradation. Development and removal of streamside vegetation can cause alteration of stream flow, shape and cause increased sediment loads.  Vegetation is required by Redside Dace for food, cover and to moderate water temperature.  Non-native fishes also threaten this species by competing with or hunting them.


Redside Dace and its habitat are protected by the following legislation:

  • Federal Fisheries Act
  • Ontario Fishery Regulations
  • Endangered Species Act
  • A draft recovery strategy has been prepared to outline the actions required to protect and restore Redside Dace and its habitat, including protection and restoration of stream banks and streamside vegetation


Ministry of Natural Resources: Redside Dace

Royal Ontario Museum: Redside dace

Data and information released from Credit Valley Conservation (CVC) are provided on an 'AS IS' basis, without warranty of any kind, including without limitation the warranties of merchantability, fitness for a particular purpose and non-infringement.

Availability of this data and information does not constitute scientific publication. Data and/or information may contain errors or be incomplete. CVC and its employees make no representation or warranty, express or implied, including without limitation any warranties of merchantability or fitness for a particular purpose or warranties as to the identity or ownership of data or information, the quality, accuracy or completeness of data or information, or that the use of such data or information will not infringe any patent, intellectual property or proprietary rights of any party. CVC shall not be liable for any claim for any loss, harm, illness or other damage or injury arising from access to or use of data or information, including without limitation any direct, indirect, incidental, exemplary, special or consequential damages, even if advised of the possibility of such damages.

In accordance with scientific standards, appropriate acknowledgment of CVC should be made in any publications or other disclosures concerning data or information made available by CVC.