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necessary 1n order to assess the role of hybridization in dc~termi n i ng the genet i c structure of the Colorado Ri ver Gi 1 a. Genomic reassortment that would occur in F2 and backcross individuals could result in either retention of hybrid LDH patterns or in the restoration of parental phenotypes. Management strategies for the Colorado River Gila are partly dependent on the presence and extent of hybrid~zation. With regard to species or population integrity, the consequences of hybridization would be minimal if there were only F1 idividuals that subsequently never contributed to the gene pool. On the otherhand~ extensive genetic mixing would ultimately lead to total introgession and species or population breakdown. These processes would be distinguishable with a multiprotein electrophoretic scheme. As listed in Table 1~ several proteins have been assayed with only LDH yield assayable differences. However, there are severable readily discernable enzymes and structural proteins that can be examined and there is an ongoing program to do so in this laboratory. Several more proteins are to be assayed on the study material by the end of Spring 1985 (Table 2). Preferential selection has been given to those proteins that tend to be ta:.:onomically variable (G. B. Johnson~ 1974; M. S. Johnson and Mickevich~ 1977; Sarich, .1977)~ since these may be more likely to show interpopulational electrophoretic migration differences. Since all 'Methods and Materials' are samples mentioned in currently frozen at -80 oC. there is no need to obtain new