Archive for hti  Catch and release, again  As explained in our
recent post Fisheries Outpatient Center, we are currently
conducting a study of trout (Oncorhynchus mykiss) movements in a
central valley watershed. We expected that we would be able to
track fish throughout the watershed, but recapturing a tagged
fish was unexpected. This female O. mykiss was first caught
angling on March 23, 2010. It was approximately 20 inches (505
mm) in length and appeared to be post-spawn, due to the eroded
caudal fin and lean appearance. We surgically implanted an
acoustic transmitter (HTI LX tag) and released the fish in the
same location where she was caught. Since her release we have
been tracking her location using fixed and mobile hydrophone
receivers. During the last 7 months she has remained within one
third of a river mile (570 meters) of the site where she was
originally captured and released. To our surprise, while out
angling this fall for additional O. mykiss to tag, we managed to
recapture this same fish (Octob