Tagging salmon yields interesting results
[ Birds take over 30 million juvenile salmon yearly.]
Last week, the U.S. Army Corps of Engineers held its annual research review at Walla Walla Community College. The program, continuously funded research since 1953, included 50 studies for 2013 on adult salmon passage, bird predation, lamprey passage, juvenile fish survival at dams and related subjects.

#Many interesting results came from juvenile salmon tagged with passive integrated transponders (tiny radios without a battery). Returning adults were detected at the dams and in many tributaries.

#Millions of PIT tags are put in juvenile salmon each year. Sockeye tagged in Idaho are returning up the Snake River at over 98 percent per dam project. Results were similar for .... http://union-bulletin.com/news/2013/dec/17/tagging-salmon-yields-interesting-results/