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zI <br />In some instances, it was advantageous to sample two reaches by proceeding <br />immediately from one to another. There are also times that equipment <br />failure or other factors dictate minor schedule changes. No changes are <br />allowed unless compatible with the philosophy of the sampling design. <br />The intent of the sampling procedure as outlined was to provide a basis <br />for the collection of both positive and negative correlations between <br />habitat,and endangered fish species by sampling all river reaches and <br />all habitats and by collecting physical as well as biological information <br />over the wide range of condition present throughout the river. <br />Within each 0.5 mile intensively sampled reach, discrete habitat types <br />were delineated (Figure 3) and fish collections conducted within them, <br />rather than across several habitats. This permitted a delineation of <br />habitat preferences and associated depths, velocities and substrates. <br />Sampling was not only stratified spatially, but also temporally. Days <br />were subdivided into one a.m. sampling period, one p.m. daylight sampling <br />period, and a darkness sampling period. A midday period of sampling <br />inactivity was reserved for equipment maintenance, travel and personal <br />activities of the crew (Figure 4). Daylight activities were devoted to <br />netting, trapping, electrofishing and physical/chemical measurements. <br />Activities during darkness are devoted to tending nets, traps, electrofishing <br />and some seining.