[env-trinity] Mainstem Trinity River spawn survey update for October 20-23

[Chamberlain, Charles]

Fans of the Trinity River,
Our spawning survey crews got wet this week covering the Trinity from
Lewiston Dam to Pigeon Point, and from Hawkins Bar to Rolands Bar in
Hoopa.  Turbid water conditions prevented survey of Rolands Bar to
Weitchpec.  It sure is good to see the rain, even if it does get in the way
of our survey!

445 redds and 622 carcass locations were mapped.  The figure below is
clipped from the latest weekly spawn survey update available now on the
Arcata Fish and Wildlife Office fisheries webpage.
http://www.fws.gov/arcata/fisheries

[image: Inline image 1]



*Fun fact for the week...  courtesy Katrina Wright - Arcata Fish and
Wildlife Office*

*Did you know*....  Fishing weirs in several locations are used to capture
and monitor adult salmon runs as they migrate upriver in the
Klamath-Trinity Basin. Placed across all or part of a river, weirs direct
upstream swimming salmon into a holding cage or through a small area in
front of a video camera. Weirs have been used for thousands of years by
many cultures across the world and were traditionally built from wood or
stone. This September archaeologists from the University of
Victoria discovered what may be the oldest known fishing weir on the ocean
floor off Haida Gwaii (an archipelago on the North Coast of BC, Canada,
a.k.a. Queen Charlotte Islands). Using sonar to view images of the
seafloor, they found clustered boulders and unnatural rectangular shapes
that are at least 13,700 years old. The structures are 100 meters deep on
the sea floor in the Juan Perez Sound, an area that was at sea level
thousands of years ago. The sonar scan suggests that a wall of large
boulders was placed in a line perpendicular to the ancient stream channel.
Next summer archaeologists will continue to investigate the area using
their remotely operated vehicle. They will take sediment samples and look
for stone tools or evidence of campfires at the nearby rectangular
depressions which may have been camp sites. If verified, this would be the
earliest evidence of human habitation in Canada.

http://m.theglobeandmail.com/news/british-columbia/bc-researchers-may-have-found-earliest-site-of-human-habitation-in-canada/article20737278/

http://www.cbc.ca/news/technology/earliest-sign-of-human-habitation-in-canada-may-have-been-found-1.2775151


Please let me know if you wish to be removed from the blind cc list I use
weekly to distribute this announcement.

Talk to you next week,
Charlie

Charles Chamberlain
Supervisory Fish Biologist
U.S. Fish and Wildlife Service
1655 Heindon Road, Arcata, CA 95521
http://www.fws.gov/arcata/fisheries
(707) 825-5110
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