My co-workers and I sampled the San Antonio River in 2003 (including the
reach near the Zoo).
Numerically, the two most abundant species were the red shiner and western
mosquitofish (both native). Next most abundant taxa were sailfin molly,
Mexican tetra, tilapias (3 spp.), and Rio Grande cichlid (all non-native).
In terms of biomass, sailfin catfishes, blue tilapia, and Rio Grande cichlid
(all non-native) were dominant. The San Antonio ichthyofauna must be one of
the more exotic in North America.
- Jan Hoover
Vicksburg, MS
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