COSEWIC Assessment and Update Status Report on the Aurora Trout in Canada
- Assessment Summary
- Executive Summary
- COSEWIC Mandate, Membership and Definitions
- Lists of Figures and Tables
- Species Information
- Population Size and Trends
- General Biology
- Limiting Factors
- Special Significance of the Species and Evaluation
- Technical Summary
- Acknowledgements, Literature Cited and The Authors
The basic colouration of Aurora Trout is similar to other Brook Trout (Sale 1967). Dorsal colouration is olive green to dark brown. Along the sides this fades to iridescent steel blue and silver and pales to a white abdomen that is often tinged with pink. Pectoral, pelvic and anal fins have a leading white edge backed by a black bar and orange or red posterior. During spawning season the colour of males intensifies, the sides and upper abdomen taking on a bright red colour, often edged by a band of black along the abdomen (Figure 1). The distinguishing aspects of Aurora Trout colouration (Henn and Rinkenbach 1925; Sale 1967) are: (1) adult Aurora Trout lack the yellow spots and vermiculations that typically occur on the dorsal surface of other Brook Trout; and (2) the numerous red spots surrounded by blue halos characteristically found on the sides of Brook Trout are greatly reduced in number or are absent on Aurora Trout. Sale (1967) further noted that the body colour of Aurora Trout exhibits a strong iridescence not apparent in other Brook Trout.
Photograph by E. Snucins.
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