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Sockeye can mature at ages between two and six years old but in most systems, one age group (usually four-year-old fish) dominates, meaning most of the offspring produced in any one brood-year return to spawn four years later. This year of increased population significance creates a cyclic dominance which leads to spectacular returns to the Adams River every four. Although there are many ideas about why this occurs, nobody knows for sure.

Unlike other salmon species which generally migrate long distances in the open ocean, coho remain in coastal waters. Their proximity to land, their willingness to take lures and their tendency to jump and dodge makes them a favourite among sport fishers.