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Corvallis Research Lab
Data Forms and Explanations

DATA INSTRUCTIONS


Download EXCEL97 spreadsheet for Data Entry and Summary. (Updated May 28, 1998)

Download EXCEL95 version of spreadsheet. (Updated May 28, 1998)

Download Word document explaining how to use the spreadsheet.


The sampling week begins on Monday and ends on Sunday. Each day the following information should be collected and recorded at each trap site:

CATCH DATA

    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 anesthetic.

    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 frequency analysis.

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.

TIME/WEATHER FORM

    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.

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