Research Documents High Rates Of ‘Minijacks’ From Hatchery Bred Spring/Summer Chinook

Of the 31 million spring and summer chinook salmon released each year from Columbia River Basin hatcheries, 4.1 percent up to 71 percent of the fish leaving hatcheries will mature quickly and some of those will return early as smaller minijack salmon, depending on the originating hatchery, while the production of minijacks from wild stocks is estimated to be less than 5 percent of males.

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