The endangered tidewater goby currently lives in Rodeo Lagoon and parts of Tomales Bay. Historic records indicate that the small estuarine fish occurred in at least 9 other locations within the San Francisco Bay Region, such as Lake Merced and the Cliff House/Sutro Baths in San Francisco. Threats to this species include loss of habitat through excessive sedimentation, poor water quality, and non-native competitors.
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