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<br />Table 8. A comparison of data from a 1970 study (May 1972) of the Fisher <br />River and the present study. Relabve abundance of aquatic <br />insect orders expressed as percen t of annua 1 densi ty and <br />bi omass means. <br /> <br /> 1970 Study <br /> Fi s her Ri ver Presen t Study <br />Aqua ti c S ta ti on 1 Stati on 3 Fisher River Station <br />Insect Order % % % <br />Ephemeroptera <br />Densi ty 17.7 15.9 6.3 <br />Bi omass 21. 0 37.0 18.2 <br />Pl ecoptera <br />Densi ty 41. 5 26.8 41. 6 <br />Bi omass 34.2 17.8 25.2 <br />Tri c hoptera <br />Densi ty 1.3 18.5 4.2 <br />Biomass trace 3. 1 1.0 <br />Co 1 eoptera <br />Densi ty 21. 6 29.6 15.5 <br />Bi amass 20.0 24.8 27.5 <br />Di ptera <br />Densi ty 17.9 9.2 32.5 <br />Bi amass 24.8 17.3 20.1 <br /> <br />-23- <br />