Definition of chum salmon
: a metallic bluish green salmon (Oncorhynchus keta) of the northern Pacific Ocean and Arctic Ocean that may reach a length of about 3.5 feet (1 meter) but is typically smaller ◆Upon entering freshwater to spawn, the male chum salmon develops large, sharp teeth and becomes dark green to brown with reddish-purple vertical stripes.
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Britannica.com: Encyclopedia article about chum salmon
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