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6 <br />Many investigators combined bonytail and roundtail chubs in their studies, and in such <br />cases we used combined data for the two. Humpback chub data were independent of <br />those for other Gila. We also note that Cichlid fishes now in the lower Colorado River <br />may represent various hybrids and back-crosses, and parentage of many of cannot <br />reliably be determined. A number of species have been introduced to the system (see <br />Barrett 1983), enjoyed a period of abundance or even dominance in the community <br />(Minckley 1979, Marsh and Minckley 1985), then dwindled or been subsumed into the <br />hybrid.swarm. Included were blue (Oreochromis [Tilapia] aurea), Mozambique (0. [T.] <br />mossambica), and redbelly (Zill's, T. zilli) tilapia. <br />We include several sections literature with this report to enhance utility of the document <br />and make it easier for the reader to locate and identify specific information. A <br />LITERATURE CITED follows the body of the paper, which provides references for all <br />literature cited in the text. It is followed by a companion REFERENCES USED, which <br />includes the following sections: (1) fish code list, (2) classification list, (3) numbered <br />tables that match those in text and provide supporting referrals to cited literature, and <br />(4) numerically identified (A) and alphabetic (B) lists of all references selected for use <br />in constructing tabulations and matrices. APPENDIX III (Published and unpublished <br />works) provides a literature that specifically documents fish interactions. APPENDIX IV <br />is a comprehensive, abbreviated bibliography of all literature examined. Finally, <br />APPENDIX V includes a list of important works on meta-analysis (below). Although we <br />have attempted to avoid duplication, in some instances it was necessary for clarity and <br />completeness to include the same references in one or more of these sections. <br />ANALYTICAL PROCESS -- Each section of an individual study, book chapter or report <br />was critically reviewed, particularly tables and figures. Recorded data was primarily <br />qualitative except for juvenile length at initial piscivory, and habitat and spawning <br />temperatures. Other data (e.g., preferred depths, water quality parameters) were <br />disregarded due-to their quantitative nature and specificity. However, many reviewed