The oldest steelhead spawned at the Root River Steelhead Facility was an 8-year-old male. In King County, they are found in the Snoqualmie, Cedar, Green, and White river systems. There is a dramatic sexual dimorphism at maturity. Once the salmon reach freshwater, they stop feeding. Pink salmon weight and chum salmon length (e.g., age -4) decreases with latitude 0 0.5 1 1.5 2 2.5 3 Pink salmon weight (kg) cula yound k ia ska bia r ongon 550 600 650 700 750 800 Chum salmon length (mm) pink weight chum length Some male cohos will spawn after only one summer in the lake. The majority of steelhead spawn at 3 and 4 years, with some spawning at 5 to 6 years. Spawning males develop a humped back and hooked jaws filled with tiny, visible teeth. They are often found spawning in rivers or larger streams, and are usually one of the earlier salmon species to spawn in the fall. Valuable nutrients from the carcasses form a rich food source for other fish and wildlife by fertilizing the stream or lake. juv.) The skull changes, most notably the lower Jaw formation as it develops a “Kype” (hook at tip of lower jaw) and grows a new set of “breeding teeth” to help compete against other male Salmon. Chinook salmon Oncorhynchus tshawytscha Chinook, also called "king" or "black mouth," are the largest of the Pacific Salmon. Both males and females die within a few days of spawning. Their bodies, battered and injured by the difficult trip upstream, decompose. Body color in both males and females darkens from a bright silvery appearance to a pale slate, brownish, or greenish-gray on the back and sides and a pale whitish color below. Most male coho salmon return to their natal streams to spawn after three years in the ocean, but some male only spend two years at sea and then return to their natal spawning streams. As sockeye salmon return to their freshwater spawning grounds, their heads turn green and their bodies turn bright red, hence their other common name in Alaska is “red” salmon. Commonly, spawning male Pacific salmon will develop a large “kype”, or hooked jaw. The male Chum salmon’s teeth grow noticeably, one of the apparent reasons they are referred to as Dog Salmon. All species of Pacific BC salmon undergo a change in colour as part of the spawning process. Download PDF. The larger male usually dominates, however sometimes several small male fish may fertilize the eggs from a large female. Coho salmon spawn only once and then die. In the event that the male of the pair is the victim of a predator, another male fish may undertake the task of fertilizing the eggs that the female will deposit into the spawning beds. Published: 24 May 1952; Spawning of the Male Salmon Parr (Salmo salar Linn. Spawning between male and female salmon is synchronised by visual and chemical signals. [20] Males go through numerous morphological changes at maturation including, an increase … A male (left) and female (right) sockeye salmon spawning in the Adams River of British Columbia, Canada. Male Coloured Salmon (Cock Salmon) Male Atlantic Salmon go through a massive change in appearance. Salmon carcasses that are carried onto riverbanks fertilize the forest and bushes. Biology. This single spawning life history strategy is called semelparity. The chemical signals involve the use of pheromones, specific chemicals that are released by the female and detected by the males. Pink Salmon As male pink salmon begin to enter the spawning phase, they develop a prominent hump in front of the dorsal fin, an elongated snout, and large teeth. juv.) Small, During the course of the journey, their bodies instinctively prepare for spawning. 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