Chum salmon

Euryhaline fish (marine and freshwater) with regularly ossified skeleton. Body elongate, but becoming deeper with age, spawning males becoming slightly hump-backed. Tip of upper jaw reaching to somewhat behind eye, snout and lower jaw becoming somewhat hooked in spawning males. Dorsal finrays and an adipose fin behind it; pelvic finray, base below about middle of dorsal fin. Anal finrays. Caudal fin slightly forked. Scales small, 125-150 in lateral line. Colour bright silvery with no distinct black spots; spawning males dark olive, flanks reddish grey with crimson or lilac bars, females less distinctly marked.