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TABLE 3 Benthic invertebrate density (N = numbers/m2), diversity (D) <br />{ and numbers of taxa (S) for the riffle sections of Station 2 <br />!1 on Fish Creek over three years. <br />1975 1979 1980 <br />July August July August <br />N 194 25813 307 15228 <br />( D 2.20 2.30 2.00 2.48 <br />5 6 20 9 25 <br />FISH <br />As shown in Table 4, fish were common at all stations in Middle Creek. <br />Species occurring are characteristic of the lower portions of streams in the <br />area. The minnows tend to dominate in density (numbers) and the suckers <br />tend to dominate in biomass (weight) at the lower stations. Two species, <br />the redside shiner and the mottled sculpin, were not present at Station 1. <br />The mottled sculpin is uncommon throughout the study streams (Dames and <br />Moore, 1975). The creek chub and the white sucker are often found together <br />in small gravel-bottomed streams having overhanging bank cover and slow-water <br />pool habitat (Baxter and Simon, 1970). Much of the differences in relative <br />abundance of fish species in Middle Creek is probably related to habitat <br />f changes, as discussed earlier. <br />Fish populations in Fish Creek exhibited decreased abundance from <br />Station 1 to Station 2 (Table 5). All species except white sucker had <br />reduced numbers at Station 2. However, only the redside shiner decreased <br />significantly in relative importance. Fish Creek Station 2 was also sampled <br />for fish in 1975 and 1979. Considerably fewer fish were captured in 1975 <br />(13) and in 1979 (8). Reasons for this are not known. Methods far collec- <br />tion and stream sections sampled were identical all three years. In this <br />study, the fish population of lower Fish Creek is fairly diverse, with abun- <br />dances similar to Middle Creek. <br />-17- <br />