I think tannic acid lakes tend to have low fertility and this may be more of a reason for the poor bluegill population than competition with CCS or LCS. I have no experience with LCS, but the fisheries biologists in Texas who do, seem to believe they are top notch forage for bass. As experience with LCS and perhaps CCS expands, we may determine them to have a possible detrimental affect on the sunfish population. My experience with reservoirs with CCS in them has been about the same as those without. I think gshad are far more deleterious to sunfish that LCS or CCS ever would be.

LCS
Food habits: Invertivore/herbivore (Goldstein and Simon 1999). Major food items in streams include midge larvae (Dipteran), detritus and algae, small clams, and water mites (Sheldon and Meffe 1993). Pond-reared fish consumed items including detritus, filamentous algae, zooplankton (cladocerans, copepods, ostracods), and midge larvae (Shireman et al. 1978). Copepods, cladocerans, and midge larvae (Dipteran) and pupae were also an important prey of a lake population of chubsuckers (Ewers and Boesel 1935).

BG
Food habits: Larvae and juveniles of 5-10 mm in length frequently ingest Cladocerans and copepod nauplii (Werner 1969; Beard 1982). Individuals reaching 20 mm have varied feeding habits, primarily consuming Cladocera (Chydorinae) and adult copepods and insects (mainly chironomids; Beard 1982). The primary diet of adults in various water bodies is comprised of aquatic insects, crayfish, and small fish, although zooplankton serves as the main food item in other bodies of water (Mittelbach 1984; Carlander 1977). This species also ingests aquatic vegetation including algae (Carlander 1977; Sublette et al. 1990). Based on the following data, Goldstein and Simon (1999) list first and second level trophic classifications as invertivore and drift; trophic mode listed as water column/surface: In Canada, populations primarily consumed insects, crustaceans, and plant material, with 50% of food volume consisting of chironomid larvae (Keast and Webb 1966); in late summer, when insects were not as abundant, 22% of diet was plant material (Moffett and Hunt 1943; Goldstein and Simon 1999). The fish louse, Argulus, has been found in bluegill stomachs, suggesting individuals may perform �cleaning� function on infected fish (Carlander 1977).

Compare their diets and make a call on whether they would compete with each other...