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NATIVE FRESHWATER AND ANADROMOUS FISHES <br />OF COASTAL SOUTHERN CALIFORNIA <br />Camm C. Swift <br />Section of Fishes <br />Natural History Museum of Los Angeles County <br />Los Angeles, CA <br />Thomas R. Haglund <br />Department of Biology <br />University of California <br />Los Angeles, CA <br />The coastal drainages of southern California have a small <br />native freshwater fish. fauna consisting of 27 taxa (six <br />freshwater, six anadromous, four freshwater/brackish and <br />eleven marine tax a that frequently enter freshwater). Six <br />of the sixteen nonmarine forms are endemic to southern <br />California. The southern terminus of the distribution for <br />all the anadromous and freshwater/brackish taxa occurs in <br />this area. Only a limited number of historical records <br />exist for several of the marine invaders. The species <br />restricted to bays and lagoons which. spend part of their <br />life cycle in freshwater and the other in brackish water <br />live in a habitat which has been severely reduced. In fact, <br />the habitat for all native taxa has been reduced. One taxa, <br />Lampetra sp., has already been extirpated; one is endangered, <br />Gasterosteus aculeatus williamsoni,:.and a third is a species <br />of special concern, Eucyclogobius newberryi. Human modifi- <br />cation of habitat and continuing introduction of non-native <br />fishes continue to be the major threats to native species. <br />This paper will compare the historical distributions of the <br />southern California native freshwater fishes with the most <br />current information on their present distributions. <br />53