[env-trinity] Trinity River spawn survey update October 25 to 31

[Chamberlain, Charles]

Hi all,
Our latest in-season report from the Trinity River Salmon Spawning Survey
is available from the Fisheries web page of the Arcata Fish and Wildlife
Office:
http://www.fws.gov/arcata/fisheries

Our crews last week mapped the locations of 537 redds and 427 carcasses.
 The figure below is clipped from our report available at the link above.

[image: Inline image 1]
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*Fun fact for the week...*
Did you know…. Male Chinook Salmon typically adopt one of two reproductive
strategies – A.) Remain in the ocean for a couple of years or more to put
on substantial growth and then return to the river as a large buck in prime
condition to fight other males for mates, or B.) Return from the ocean
early as a small jack and employ a “sneaker” strategy to mate with females
while the large males are preoccupied with females or battle.  As time
approaches for a male to spawn, his body morphs into a form purpose-built
for the strategy he will adopt.  A fighting male generally takes on deeper
coloration and grows a large kype or hook jaw - traits beneficial for his
efforts to establish dominance.  For subterfuge and to avoid drawing the
attention of aggressive males, jacks will mimic the coloration of females.
 While jacks typically experience lower spawning success than their larger
counterparts, the evolutionary disadvantage of being too small to
effectively fight for mates is partially offset by the advantage of reduced
exposure to mortality in the ocean.

Till next week....
Charlie

Charles Chamberlain
Supervisory Fish Biologist
U.S. Fish and Wildlife Service
Arcata Fish & Wildlife Office
1655 Heindon Road
Arcata, CA 95521

Charles_Chamberlain at fws.gov<https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=Charles_Chamberlain@fws.gov>
Phone: (707) 825-5110    Fax: (707) 822-8411
www.fws.gov/arcata/fisheries
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