Here is a list of articles ect I have come across on this. FWIW they do not think it is gill lice as the issue was worse in 2012.
http://www.syracuse.com/outdoors/index.ssf/2014/12/scientist_puzzled_about_whats_killing_steelhead_in_the_salmon_river_and_other_la.html http://www.usgs.gov/newsroom/article.asp?ID=3868#.VI-rFJU5DIX This was an e mail received from Scott Prindle, the Biologist in charge of the SR.
There have been steelhead acting strangely and dying for several weeks now. We
sent an initial sample to Cornell University Vet School to see if was being
caused by a disease, virus or parasite. They found nothing conclusive on those
fish.
We think it may be related to thiamine levels in the fish. Similar observations
have been made in other Great Lakes in the past. Last week we captured several
fish and took muscle and liver samples to be sent off to a Federal Fish Health
lab to determine their thiamine levels. Additionally we are holding some fish in
a pen at the hatchery that are acting sick and have injected them with a
thiamine solution. This has worked in the past to revive fish that were
suffering from thiamine deficiency.
Here is a set of articles about the great lakes salmon . it I old but has some good stuff
http://www.jsonline.com/n...97825z1-284550501.html Unfortunately while we may be able to determine that thiamine is the culprit,
there is not much that can be done from a practical standpoint.
I'll let you know what we hear from the Feds.
Scott"