Scientific Name: Fundulus diaphanus
Other/Previous Names: Banded Killifish (Mainland population)
Taxonomy Group: Fishes
Range: Manitoba, Ontario, Quebec, New Brunswick, Prince Edward Island, Nova Scotia, Newfoundland and Labrador
Last COSEWIC Assessment: April 1989
Last COSEWIC Designation: Not at Risk
SARA Status: No Schedule, No Status
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
The Banded Killifish is a small fish (family Fundulidae) that reaches a maximum size of approximately 120 –130 mm in length. It has a flat head and an upward-pointing mouth. The dorsal surface is brown to olive-coloured that fades to silver or cream colour below. The species has vertical bands over most of the body that are more closely spaced in males than females. Another sexually dimorphic feature is observed during the spawning period when males develop a bluish hue of varying intensity around the anal fin. The Banded Killifish is one of two cyprinodonts in insular Newfoundland. Where present, it is a significant member of Newfoundland's freshwater fish communities, which are characterized by low species diversity. The Newfoundland populations of Banded Killifish are situated on the eastern periphery of the species' range and may harbour unique adaptive genetic variation (e.g. spawning occurs during summer months while mainland populations are spring spawners).