A small salmon (Oncorhynchus gorbuscha) of Pacific waters, the male of which has a pink color and a conspicuous dorsal hump during the spawning season. Also called humpback salmon. Food fish (Oncorhynchus gorbuscha, family Salmonidae) of the North Pacific that constitutes half of the commercial fishery of Pacific salmon. It weighs about 4.5 lbs (2 kg) and is marked with large, irregular spots. Pink salmon often spawn on tidal flats. The young enter the sea immediately after hatching