So, a follow up on this project...
Semiahmoo Fish and Game Club hatchery staff/volunteers counted how many clipped and non clipped chinook passed through the fish fence. Throughout Oct and Nov, teams from A Rocha walked an approx 4 km stretch of river from the hatchery to 24 Ave, counting and doing observations of clipped and non clipped chinook and doing a head recovery of clipped fish to recover any coded wire tag (CWT). This is what we recently learned from DFO:
- ~50 % of the clipped fish that passed the fence were recovered/counted
- ~18 % of non-clipped fish were recovered
- 3 of the clipped fish had CWTs
- 72 of the clipped fish didn't have CWTs
- all 3 fish with the CWTs came from the Samish River in WA state
The Samish River hatchery clips all chinook, but only tags approx 3-4%. Since their proportion of clipped tagged vs clipped untagged matches our recovery, DFO estimates that all the clipped fish in the LC in 2022 were from the Samish River.
Couple of things that I find interesting:
1) The Samish is about 50 km (as the crow flies) south and there are a couple of hatcheries that produce fall chinook that are closer to the Little Campbell than the Samish; the Whatcom Creek Hatchery in Bellingham and the Lummi Bay hatchery. Both are much closer to the LC than the Samish, so it's curious to me why only Samish fall chinook are showing up in the LC and not fish from the other two. (The Lummi Bay website says that they work cooperatively with Samish River and Whatcom Creek hatcheries so maybe that's part of it...)
2) We found almost three times as many clipped fish in the lower reaches of river than non clipped. It's interesting to me that non clipped fish shoot further upstream to spawn than clipped fish do.