Reports

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TR-32

The Composition and Distribution of the Fish Fauna of the Navasota River

R. K. Strawn, W. J. Clark

Twenty-one thousand fish representing 9 orders, 14 families and 56 species were collected from various habitats of the Navasota River drainage. Some species such as Notropis lutrensis, Gambusia affinis and Lepomis macrocllirlls were taken throughout the drainage from widely varying habitats. Others, such as Notropis atrocaudalis, N. venustus and Campostoma anomalum, were found only a few times in more specialized habitats.

Some Austroriparian species, such as Fundulus notti, F. olivaceous and Lepomis marginatus, apparently reach their western range limits at or near the Navasota drainage. Other east Texas and coastal plains fishes such as Amia calva and Lepomis symmetricus reach their western inland limits at near the Navasota drainage.

Some species, such as Dionda episcopa, Hybognathus plactius, and Etheostoma spectabile, are found in more western drainages but are absent from teh Navasota drainage.

It is suggested that some of these fish distributions are the result of immigration or stream piracy. Proposed water development projects for the Navasota River include the construction of dams. If these dams are constructed, changes in the fish populations are sure to occur. This study should contribute basic information from which the effects of future water development can be evaluated.

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