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The Double-crested Cormorant is the most abundant cormorant in Canada, and typically breeds on islands in both freshwater and marine environments. A variety of surveys provide strong evidence that Double-crested Cormorants have shown a large increase in abundance in Canada since the mid-1970s, and in some locations, these increases have been dramatic and accompanied by the establishment of new breeding colonies. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.
Because of the substantial increases in the abundance of cormorants in recent decades, most management issues relate to conflicts with humans and degradation of habitat. Double-crested Cormorants are believed by some sport- and commercial-fishers to adversely affect fisheries. While cormorants feed opportunistically on fish, recreational and commercial fish-species do not make up a large portion of their diet (Dorr et al. 2014). Lethal and non-lethal control methods are routinely employed on cormorants that prey on fish at aquaculture facilities (Dorr et al. 2014). Nesting colonies are quickly denuded of vegetation, which can reduce their suitability for other breeding birds (Bedard et al. 1997).
Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:
Select any of the sub-regions below to view the BCR strategy for additional details.