California Study Focuses On How Unmarked Hatchery Fish Can Mask Condition Of Wild Salmon

Scientists have found that only about 10 percent of the fall-run chinook salmon spawning in California’s Mokelumne River are naturally produced wild salmon. A massive influx of hatchery-raised fish that return to spawn in the wild is masking the fact that too few wild fish are returning to sustain a natural population in the river.

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