O. mykiss passages at the Stanislaus River weir, 2005-2020

The Central Valley Project Improvement Act (CVPIA) provides funds to
aid the San Joaquin Basin Steelhead Collaborative and initiate a
Steelhead Life-Cycle Monitoring Program. This dataset includes
observations of O. mykiss in the Stanislaus River during the
steelhead spawning migration period, September through May. Fish are
observed at an Alaskan-style weir outfitted with a VAKI Riverwatcher
fish counting device. The counting device provides visual records of
upstream passing individuals that are later reviewed by an
experienced biologist. During times when the counting device is
offline, a continuous video feed is reviewed to provide counts and
identifications of passing fish. The length of passing fish is
estimated using a known body depth to length ratio derived from
individuals trapped and measured at the weir. The weir also has a
trap box that, when closed, allows investigators to physically
capture fish for measurements, biological sample collection, and
injection of a PIT tag. There is also a PIT tag antenna affixed to
the weir allowing detection of PIT tagged fish. There are three
datasets currently associated with this project, 1) passage data for
all O. mykiss from 2005 through 2020, 2) O. mykiss that were
captured and processed from the trap, and 3) PIT tag detections from
the PIT antenna.