Pink salmon or humpback salmon, Oncorhynchus gorbuscha, (from a Russian name for this species gorbuscha--горбуша) is a species of anadromous fish in the salmon family. It is the smallest and most abundant of the Pacific salmon.
Pink salmon in their native range have a strict two year life cycle, thus odd- and even-year populations do not interbreed. Adult pink salmon enter spawning streams from the ocean, usually returning to the water course, or race, where they originated. Spawning occurs between late June and mid-October. Pink salmon spawn in coastal streams and some longer rivers, and may spawn in the intertidal zone or at the mouth of streams if hyporheic freshwater is available. Using her tail, the female digs a trough-shaped nest, called a redd, in the gravel of the stream bed, wherein she deposits her eggs. As she expresses the eggs, she is approached by one or more males who fertilize them as they fall into the redd. Subsequently, the female covers the newly-deposited zygotes, again with thrusts of her tail against the gravel at the top of the redd. The female lays from 1000 to 2000 eggs in several clutches within the redd, often fertilized by different males. Females guard their redds until death, which comes within days of spawning. In dense populations, a major source of mortality for embryos is superposition of redds by later-spawning fish. The eggs hatch from December to February, depending on water temperature, and the juveniles emerge from the gravel during March and April and quickly migrate downstream to estuaries at about one-quarter gram. The fish achieve sexual maturity in their second year of life. They return to freshwater in the summer or autumn as two year old adults. Pink and chum salmon sometimes interbreed in nature to form the hybrid known as the miko salmon; the hybrids are reproductively sterile.
Pink salmon are coldwater fish with a preferred temperature range of 5.6 to 14.6°C, an optimal temperature of 10.1°C, and an upper incipient lethal temperature of 25.8°C. The species is native to Pacific and Arctic coastal waters from the Sacramento River in northern California to the Mackenzie River in Canada; and in the west from the Lena River in Siberia to Korea. Populations in Asia occur as far south as Hondo Island in Japan. Pink salmon were introduced into the Great Lakes; this is the only location where they have been successfully introduced into an entirely fresh water environment. In the Great Lakes, they are most common in Lake Superior but are rare in Lake Michigan.
The pink salmon is critically imperiled in California, and imperiled in Washington. In Alaska and British Columbia they are secure. And in the Great Lakes they have been introduced. Many have been caught while fishing lake michiganlillooet B.C.
Beginning in the late nineteenth century, fish traps were used to supply fish for commercial canning and salting. The industry expanded steadily until 1920. During the 1940s and 1950s, Pink Salmon populations declined drastically. Fish traps were prohibited in Alaska in 1959. Now most pink salmon are taken with purse seines, drift nets or gillnets. Populations and harvests increased rapidly after the mid 1970s and have been at record high numbers since the 1980s.
"Salmon pink" is a color named for the typically pink color of this fish's flesh. The color derives from their diet, which includes shrimp and krill. When the fish are mating, and thus shrimp and krill are hard to come by, it is common for them to eat red berries which preserves the color of the flesh.