Earlier this week a clogged inlet stopped flowing water from entering the raceways containing 400,000 juvenile salmon at the Rock Creek Hatchery along the North Umpqua River. All of the young fish were killed. My 1st thought was “there’s goes a half million dollars!”.
Those juvenile fish were set to be released into the North Umpqua next spring, to begin their 3-5 year life cycle, with the final stage being a return to where they were released to start the process all over again. 400,000 fish sounds like a lot, and it is, but generally, hatchery returns are around 0.7%- 1.2%. So in the end, we lost 3,000 – 4,500 returning adults 3 to 5 years from now.
What happens to the other 395,000 fish that are released each and every year? I’m guessing that a whole lot of them don’t survive the first week after being released. Let’s jump back a little and look at the process.