The Texas Parks and Wildlife Department assessment of the red tide bloom in Galveston estimates the number of sih killed at 1 million, but mostly limited to Gulf menhaden and hardhead catfish.
Aerial surveys over the upper and lower coasts revealed no visible red tide in those areas, but that “does not mean that the red tide is gone, but rather that cell counts are not high enough to discolor the water.”
The TPWD red tide status website page reports that on Monday August 20:
TPWD received a report of a fish kill at the Turtle Bay boat ramp near Palacios this afternoon. It is not yet known if this is related to the red tide event; water samples will be analyzed to determine if K. brevis is the cause. No other areas along the upper coast saw any fish kills, aerosols or other red tide-related impacts over the weekend. The lower coast remains unaffected by this bloom.