Abstract
The composition, diversity and similarity of fish communities associated with macrophytes of two oxbow lakes of Mogi-Guacu River, Sao Paulo State, Brazil, were evaluated in the wet and dry seasons of 1994–1995. Fish species composition and relative abundance values were similar for both lakes, despite their difference in connection time to the river and the abundance of macrophytes. The fish communities were predominantly composed by small sized species typical of lentic environments (Characidae), juveniles of large non-migratory species (Erythrinidae and Gymnotidae) and a few juveniles of migratory species (Anostomidae and Curimatidae). These lakes are not characterized as nurseries for the young of migratory species and the zooplankton does not have an important role as food in the ontogenetic development of migratory species of fish.
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