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GEAR CODE DESCRIPTION I I I I I I I I I I I I I I I I I I I the larger rapids, sampling was concentrated in the section of river accessible from camp sites between rapids. Use of the Achilles starting in 1987 facilitated access to some areas that were not sampled in 1985 and 1986. 3.2 Data Collection and Storage All data collected in the field were recorded on data forms recommended by Reclamation from the FWS's ISMP. The st.andard field data sheet was modified by BIO/WEST for this investigation and data codes were used that were consist.ent with the Upper Colorado River Basin Database Codes (USFWS 1987). The data were then stored in the databaSe management system, dBASE 111+, to facilitate storage, access, and analyses as well as to provide data compatible with the computer system and format used by Reclamation and FWS. The standard field data sheet is presented in Appendix C. A printout of all the data collected by this investigation, together with computer diskettes containing the corresponding dBASE 111+ files was assimilated as The Cataract Canyon Database and is available from BIO/WEST as a supplement to this report. 3.3 Sampling Gear Nine types of sampling gear were used in this investigation. A brief description of each is presented in Table 2. The standard sample gears for every trip were electrofishing, gill nets, trammel nets, and seines. Drift nets were used only in June and July of 1985, 1986, and 1987 to capture drifting larval fish from recent spawning activity. Other gear types such as dip nets, kick screens, minnow traps, and hoop nets were tried at various locations to sample specific habitats or conditions. Table 2. Description of fish sampling gear used In the Cataract Canyon Studies, 1985-1988. Electrofishing Gill Net EL GB GF GM GN GP TI TJ SA SB SE DR Trammel Net Seine Drift Net Dip Net Kick Screen Minnow Trap Hoop Net DN KS, MU MT FY 22O-volt DC with Coffelt WP-15 on 18' Havasu raft 150'x 4' net with 1.5" mesh 150'x 4' floating net with 1" mesh 100'x 6' net with 2" mesh 100'x 6' net with 2.5" mesh 150'x 4' experimental net with 0.5, 1, 1.5, 2, 2.5" mesh 50'x 5' net with 1.5" and 10" mesh TI with brailes used as a float net 10'x 4' with 1/8" delta mesh 15'x 4' with 1/4" delta mesh 10'x 4' with 1/16" delta mesh Larval drift net 10' long with 12"x 18" opening and with 560 micron Nitex plankton netting long handled dip net with 560 micron mesh 4'x 3' net with 1/32" mesh with brailes st.andard commercial minnow funnel trap tyke net with 3' diameter hoop and short wings 18