Earlier this month, teams of biologists with barrels on their backs hiked three miles of Redwood Creek, scooping out juvenile coho salmon and placing them into pools. The more than 4,000 fish, which came from a hatchery in Sonoma County, are meant to bolster the creek’s small population, which has suffered from inbreeding that’s led to diminished survival in an already treacherous ocean setting. Barely 1 percent of regional coho survive their year-long journey into…