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. Introduction In June of 1962" 1ihe Midwest Regional ot:t'ice at the National Park Service contracted \lith COlorado Sta1ie Uhivers11iy 1io stuay certain ;phase. ot the ecolO8l and limnolOQ of the Green River in Dinosa.ur National ~nument. Major emphasis was to be directed toward the fishes of the area since a concurrent contra.ct with Utahlhivers1ty involved the s1iudies ot the "Biota" in ~he same area. In its broadest implication their stud1' would include ecological and l1mnological data ba8ic to the 1n1iel1'rete.t10n of intluences responsible for the distribution ot the various species o~ aquatic insects 1 planktons" algaes, and other perip~ons and even ~of the bryaphytes. . }tt:)st of the terrestrial plant communities had been studied and inventoried in 1961 by Dr. Holmaren from Utah state university. For the above reasons and in view of the fact that lDBZ17 data on atream- flow, temperatures and turbidities and other physical data have been recorded by the U.S. Bureau of ReClamation, U.S. Geological Survey, and the S1iate Game and Fish agenc ies of Utah" 'W'yoJnj.ng, and Colorado, tew of these data are tabulated in this report. This is not intended to minimize the importance of the great fluctuations in volumes, temperatures, and turbidities on the fish and insec1i faunas. On the contrary, it is fully recognized that these cyclic and often drast ic influences are largely respons ible tor the distri- bution of the nni"f'l.ls' and very likely for the several perct4sar a.d~ptations of some of the rare forms of fish. These adaptations have allowed the fish to occupy some of the narrow limits of the ecologicaJ. niches of the river environment. The omission of these data and general comment on the physic... grapby" climates" and water habitats and quality I is then, 8D intentional decision for the sake of brevity in the report. A daily unedited log of the acitivit1es and findings of Joseph E. Baz1ks is included as a basic portion at this report. It includes many important and s~ifica.nt observations on daily fluctuations in volume, turbidity, and temperatures in addition to comments on catch statistics. The general plan at study was to place a single graduate studexxt in the field for the entire sUDllll8r and fall period to makecoUections under varying water conditions. It was hoped that these collections plus observa- tions on behavior) areas and me1ihods of capture, etc." would give some better understanding of the little known distribution and life histories of the rare forms of fish endemic to the Green River. lor. 13anlts had participated in the 1961 fall and sprlns field studies and was the logical choice for tb1s assignment. He began his studies with a float trip through the length of the M:>nument with Dr. BOl.m&ren and son trom Utah state university and Walter Kitt8.1ll8, Regional Biologist ot the U.S. Na1iioneJ. Park Service, 0rII1.b$. He terminated his collections in November of 1962. it was dec ided in OCtober ot 1961 tha1i a second intens ive sampl1D& ot the river should be made it at all possible in Oe1iober ot 1962 and on succeeding years to tollow and compare popula'tioD dynamics ot the fish and invertebrates. This plan was part at a proposal submitted to the National Science Founda'tion in 1961 and was mentioned in the report of the 1961 studies to the National Park Service (Hasen 1961). Accordingly" Dr. Hagen used a crew of fourteen students in advanced classes ot :fisheries science =1=