Overview
Operation of rotary screw traps on the lower Stanislaus River at
Caswell Memorial State Park is part of the U.S Fish and Wildlife
Service’s Anadromous Fish Restoration Program and Comprehensive
Assessment and Monitoring Program under the National Marine
Fisheries Service Reasonable and Prudent Alternatives actions and
Central Valley Project Improvement Act. The primary objectives of
the study are to collect data that can be used to estimate the
passage of juvenile fall-run Chinook Salmon Oncorhynchus
tshawytscha and to quantify the raw catch of steelhead
Oncorhynchus mykiss. Secondary objectives of the trapping
operations focus on collecting biological data on juvenile
salmonids and gathering environmental data that will be used to
develop models that correlate environmental parameters with
salmonid size, temporal presence, abundance, and production.
The data package contains seven datasets including: raw catch,
trap operation, environmental, and trap efficiency data.
Raw Catch – Chinook Dataset
This dataset covers ALL Chinook Salmon captured by the rotary
screw traps. This spreadsheet includes biological data on: 1)
unmarked fall- and spring-run Chinook Salmon 2) recaptured marked
fall-run (BBY OR "Pigment / Dye", Photonic Dye, Fin
Clip, and VIE OR "Elastomer") Chinook Salmon utilized in
trap efficiency trials.
Raw Catch – Steelhead Dataset
This dataset covers ALL steelhead captured by the rotary screw
traps. All steelhead captured are unmarked and presumed to be
natural origin steelhead.
Raw Catch – ByCatch Dataset
This dataset provides biological data on ALL catch (EXCLUDING
Chinook Salmon or steelhead) captured by the rotary screw traps.
All catch in this table is of natural origin.
Trap Operations Dataset
This dataset provides trap operation data for each trap visit.
Specifically, it includes data on the visit type, trap functioning
status, start and end sampling dates and times, total revolutions
and instantaneous revolution speeds, livewell intake statuses,
debris data, and whether the catch associated for this record will
be include for juvenile production estimates.
Environmentals Dataset
This dataset covers environmental data collected at the rotary
screw traps. This spreadsheet includes turbidity (nephelometric
turbidity units), water velocity (meters per second), dissolved
oxygen (milligrams per liter), and water depth (centimeters).
Trap Efficiency Summary Dataset
This dataset provides a summary of each trap efficiency trial
conducted. It includes the release date and time, the length of
the test, the number of marked fish released and recaptured, and
whether the trial was included for juvenile production estimates.
Trap Efficiency Release FL Dataset
This dataset provides biological data on a subsample of released
fish utilized in trap efficiency trials.
