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Model 2 Optimal lacustrine habitat-for :channel catfish is characterized by the following conditions, assuming water quality is adequate: warm, stable water temperatures (summer temperatures of 25-30° C); large surface area (>,500 ha); moderate to high fertility (TDS I00-350 ppm); clear to moderate turbidities (< 100 JTU); and abundant cover (> 40°a in areas < 5 m deep). HSI - number of above criteria present 5 Model 3 ' Use the reservoir standing crop regression equations for catfishes pre- sented by Aggus and Morais (1979) to predict standing crop, then divide the ' predicted standing crop by the highest standing crop value used to develop the regression equation, in order to obtain an HSI. REFERENCES CITED Aggus, L. R., and D. I. Morais. 1979.. Habitat suitability index equations for. reservoirs based -on standing crop of fish. Natl. Reservoir Res. Program. Rept. to U:S. Fish Wildl. Serv., Hab. Eval. Proj., Ft. Collins, CO. 120 pp. Allen, K. 0., and J. W. Avault.....1970. The effect of salinity on growth of channel-catfish: P-roc: .Southeastern Assoc. Game and Fish Commissioners 23:319-331... Allen,.K. 0., and-K:. Strawn.`1968.-.`Heat_to lerance of channel catfish, Ictalurus punctatus: Proc. Southeastern'. Assoc. .Game and ".Fish Commissioners 21:399-411.- Andrews, J. W., and R.. R. Stickn'ey ;1972.. ._Interactions of .feeding rates and environmental temperature~on growth,~food~conversion~and~body -composition of channel catfish. Trans. Am. Fish. Soc. 101(1):94-99. Andrewsl, J. W.,s.L..H. Knight, and .T:,Murai 1972 .._Temperature requirements for -high density rearing of channe_1 ,catfish from ;finger_lings tomarket size.. Prog. Fish-Cult:_.84:240=242. Andrews, J. W., T. Murai, and G.~Gibbons. 1973._ The influence of dissolved oxygen on the growth of channel catfish. Trans. Am. Fish. Soc. - 102(4):835,;-838....,. ~ _;. 25