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and Summary. (Updated May 28, 1998)
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The sampling week begins on Monday and ends on Sunday. Each day the following
information should be collected and recorded at each trap site:
1. Count all unmarked fish of each species/age class/size class
category and record in "CAUGHT" column of CATCH SUMMARY DATA SHEET.
2. Count all marked fish of each species/age class/size class category
and record in "RECAP" column of CATCH
SUMMARY DATA SHEET. This refers to fish that were previously
marked and released back upstream and have been captured for a second time.
These recapture fish will be used to determine an estimate of weekly trap
efficiency. If you are at a trap site where more than one mark is being given,
also record more detailed mark recovery information on MARK RECOVERY FORM.
3. From the unmarked fish, mark a maximum of 25 fish/day for each species/age
class/size class category to test trap efficiency. Record the number of marked
fish in appropriate "MARKED" column on CATCH SUMMARY DATA SHEET.
Mark Coho smolts(age 1+), Steelhead 120 mm, and Cutthroat 120 mm with Panjet
gun if available. If the mark is being changed weekly at a particular trap site,
then consult weekly mark data sheet for correct location and color of mark to
use. Mark all other salmonids (coho age 0+, sthd and cuts < 120mm) with a
small clip to the upper caudal fin. Use scissors, or for fry, lay fish on
cutting board and use razor blades. Allow marked fish to recover a minimum of
one hour before release. Release marked fish for trap efficiency tests in the
evening, just before sunset. Most sites should have self release units. To
minimize predation problems during recovery, do not hold fry with older fish.
Large cutthroat should be kept isolated during recovery. While processing fish,
anesthetize fish using a MS-222 stock mixture at approximately 10 ml/gal (the
stock mixture should be made by dissolving 19gm of MS-222 in one liter of
water). Try to minimize the use of MS-222 on the fish. Place only enough fish in
the anesthetic at one time that can be worked up quickly. If there are large
numbers of fish to sampled, the anesthetic should be changed periodically to
maintain water temperatures and oxygen levels.
4. Release all mark recaptures and all new fish not needed for trap
efficiency tests in the pool below the trap -- not in the pool with the
trap. These fish can be released as soon as they have recovered from
5. Record any mortalities observed for each species/age class/size class
category in the MORT column of the CATCH
SUMMARY DATA SHEET. There is also a MORT column heading on the
FISH LENGTH DATA SHEET.
This is to help you tally this information as you are working fish. The
total mortalities need to be recorded on the CATCH SUMMARY DATA SHEET.
FISH LENGTH DATA
1. Measure fork lengths of 25 unmarked fish of each species/age class/size
class category that enter the trap each week. Record the length data on the
FISH LENGTH DATA FORM. Refer
to FISH LENGTH DATA FORM
for information on specific size class groups. Do not record
lengths of any marked fish that reenter the trap on the FISH LENGTH DATA FORM. Record the
length of the recovered marked fish on the MARK RECOVERY FORM. For
steelhead and cutthroat 90 mm that you take length measurements on, note whether
they show signs of silvering. Put a Y,a N, PS (i.e., Yes, No, or
Partial Silvered) after the length in the SILV? column. For steelhead and
cutthroat, note whether the length of each fish should be used for a length
frequency analysis. Put a Y,a N, (i.e., Yes or No) in the LF?
column. To determine if the fish should be used for length frequency analysis,
use the following rules. First, note that on the FISH LENGTH DATA FORM , there
are columns for various size groups of steelhead and cutthroat. For each of
these species, if none of the length columns are filled with data (25 length
records), then all fish in all columns are used in the length frequency
analysis. Once any one of the length columns has it's 25 lengths recorded, then
subsequent lengths recorded in the other columns should not be used for length
FISH SCALE DATA
Take a scale sample from 10 fish of each species for each 10 mm size
interval category each month. Tally the number of samples taken in each size
category on the SCALE SAMPLE TALLY SHEET (see scale sampling data sheet
for size categories). Do not take scales on fish less than 70 mm.
1. The TIME/WEATHER
FORM is used to determine how long the trap has fished,
document river discharge level, and to record the current weather conditions.
The START columns are filled in when the trap starts fishing and the
END columns are filled in when the fish captured in the trap are
processed. Each screw trap should have a "hubodometer" attached to the center
shaft of the cone. The reading on the "hubodometer" is recorded in the
ODOMETER column each day. (The odometer reading at the END of each
day is the same value as recorded at the START of the next day.)
2. Count the number of revolutions per minute that the cone is turning and
and record the number in the "REVOLUTIONS PER MIN" column. The staff gage
reading and the current weather conditions (sunny, clouds, rain, etc.) should be
recorded in the appropriate columns.
FISH TALLY SHEET
The FISH TALLY DATA
SHEET is provided to help you keep track of your count while
processing large numbers of fish. Use of it is optional, but data must always be
transferred to the CATCH SUMMARY DATA
SHEET after fish sampling is complete.