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<br />';:' <br />:;:;" <br />:":J <br />.;;.. <br /> <br />-- <br />'.- <br /> <br />Type III and IV secondary channels_ <br /> <br />N <br /> <br />Each sample site will be of sufficient length to include all macrohabitats (e.g_, <br />riffle, run, pool, backwater, etc.) within the channel.' Fish will be collected <br />primarily with seines. Where passive netting (e.g., trammel nets) is deemed more <br />efficient, such will be used. Boat or backpack electrofishing gear will be used <br />where this method is appropriate. The decision as to which collecting method is <br />more appropriate will be made at the discretion of the field crew. Regardless <br />of method, each will be quantified (i.e., area seined, duration of net-set, and <br />elapsed shocking time) . <br /> <br />At each site, collections will be separated by method and macrohabitat. Large <br />specimens (> 150 rom total length) in each sub-collection will be identified, <br />weighed, measured, and released (specimen release will be made in such a manner <br />that subsequent sampling is not biased). All smaller specimens (except target <br />species) will be preserved. All specimens retained will be identified and <br />enumerated. Tissue samples will be taken from each target species (Colorado <br />squawfish, roundtail chub, and razorback sucker) captured and each will be <br />implanted with a PIT tag and radio transmitter (if feasible) according to <br />established procedures. <br /> <br />Each macrohabitat will be characterized by dimensions (length, width, and depth) , <br />substrata, cover, and riparian vegetation. Dissolved oxygen, water and ambient <br />temperature, salinity, conductivity, and pH will be measured at each site. <br />Channel discharge will be estimated with a flow meter at each site. Each site <br />will be located by river kilometer, with km 0 being the confluence of the San <br />Juan and Colorado rivers, Utah (determined from <br />pre-Lake Powell topographic maps) or to be compatible with river kilometer <br />designations made for other research activities. Data will be recorded on <br />standardized forms. <br /> <br />As currently envisioned, the study will entail 3 years of field work (1991-1993) , <br />An annual report sununarizing the findings of each year's field work will be <br />submitted in December. Modifications made in the research protocol and <br />recommendations for changes will be included in the annual report. The final <br />report will be submitted with 12 months of completion of the 1992 field season. <br /> <br />A13 <br />