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Reproduction component. Percent pools (U1) is in the reproductive compo- <br />nent because channel catfish spawn in low velocity areas in rivers. Percent ~,' <br />cover fVZ) is in this component since channel catfish require cover for <br />spawning. If minimum dissolved oxygen (DO) levels within pools and backwaters <br />during midsummer (V$) are adequate, they should be adequate during spawning, <br />which occurs earlier in the year. DO levels measured during spawning and <br />embryo development, could be substituted for Ve. Two''additional variables, <br />average water- temperatures-within,. pools.: and,backwaters_during.spawning and <br />embryo development, (Ulo) and maximum salinity during spawning and embryo <br />development (U11) are included because these water quality conditions affect <br />embryo survival and development. <br />Model Cescription - Lacustrine <br />Food component: Percent cover (V2) is included since'~it`i"s assumed that <br />if cover~~is available; channel catfish`would be more:likely~to~utilize~an=-area <br />for feeding . Percent l i ttoral . area ~ (V, ) i s ..included because l;i ttoral;,,,,areas <br />generally produce the greatest amount of food and feeding habitat for catfish. <br />Total dissolved solids (TDS) (V16) is included because adult channel catfish <br />eat fish, and fish production in lakes and reservoirs is correlated with TDS. <br />Cover component. Percent cover (VZ) is included since channel catfish <br />strongly seek structural features of logs, debris, brush, and other objects ' <br />for shelter. Percent littoral area (V3) is included because all life stage <br />predominantly utilize cover found in littoral areas of a lake. <br />Water quality component. Refer to riverine model description. <br />Reproduction component. Percent cover (UZ) is included since catfish <br />build nests in dark and secluded areas; spawning is not observed if suitable <br />cover is unavailable. Percent littoral area (V3) is included since catfish <br />spawning is concentrated along the shoreline. DO (V8), temperature (V,o) and <br />salinity (V11) are included because these water quality parameters affect <br />embryo survival and development. <br />Other component. For reservoirs, storage ratio (V15) and maximum flushing <br />rate when fry are present (Vl,) are included in this component because storage <br />ratio may affect standing crop and the flushing of fry from a reservoir outlet <br />can reduce the abundance of fry. <br />8 <br />