1108

• UCREFRP Catalog Number: 1108
• Author: Valdez, R. A.
• Title: Fisheries Biology And Rafting Annual Summary Report - 1987
• USFW Year: 1988.
• USFW - Doc Type: ‎(Contract no. 6-CS-40-03980)‎.
• Copyright Material: NO

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was measured for total length and classified by developmental phase (proto-
larva, mesolarva, metalarva, juvenile); the nontarget fish were only classified
by phase. The reports of the Larval Fish Laboratory are included in Appendix C
of this report. It should be noted that any fish identified as a "juvenile" in
the LFL reports is defined as a postlarvae less than one year of age. However,
this BIOjWEST report identifies four classifications of fish as follows: (1)
larvae = fish without complete muscle and fin development and either a yolk or
yolk slit present; consistent with LFL, (2) young-of-the-year = YOY, postlarva
less than one calendar year of age, (3) juvenile = immature fish greater than
one year of age, and (4) adult = sexually mature fish.

Physical Measurements

Water depth and velocity were measured and substrate type described for all
seine hauls, and where possible, at the capture sites of endangered fish. A
photographic record of the typical and unique sample sites is included in
Appendix D of this report.

Measurements of Gila Specimens

Because of the morphological variation in the genus Gila found in the upper
Colorado River basin, each juvenile and adult chub captured was photographed on
a white background marked with a 1-cm grid pattern. Also, the following
meristics were measured using calipers, and counts were made on each chub
longer than 250 rom: (1) total length, (2) fork length, (3) weight, (4)
distance between insertion of pectoral and pelvic fin, (5) caudal peduncle
length, (6) head length, (7) length of dorsal fin base, (8) length of anal fin
base, (9) dorsal and anal fin ray counts. These measurements are recommended
by FWS in the ISMP. Additionally, the following meristics were recorded: (10)
nuchal depth, (11) minimum caudal peduncle depth, (12) maximum caudal peduncle
depth, (13) maximum body depth, and (14) snout length.

Data Collection and Storage

All data were collected in the field on data forms recommended by BOR from the
FWS's ISMP. The data were then stored in the database management system, dBASE
III+, to facilitate storage, access and analyses, as well as to provide data
compatible with the computer system and format used by BOR and FWS.

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