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Golden Alga Bloom Reports

Please note: Evidence of a golden alga-related fish kill is often difficult to track. Large numbers of small fish may be killed. Predators such as birds and raccoons may eat larger dead fish before they are observed or counted. Also, dead fish quickly sink below the surface, which interferes with counts. Estimates of numbers killed are only as good as the evidence available on the scene. The public is asked to report dead or dying fish and wildlife as soon as possible to TPWD's 24-hour communications centers at 512-389-4848 (Austin) or 281-842-8100 (LaPorte).

Texas River Basins Map

May 11, 2015 - Brazos River Basin

Lake Stamford – Lake Stamford was sampled on May 11 at Anchor Marina and Stamford Marina. Anchor Marina had low cell concentrations, while P. parvum was not detected at Stamford Marina. Samples from both sites was classified as not toxic.

North Anson Lake – North Anson Lake was sampled on May 11 at the boat ramp. P. parvum cell densities were categorized as low and the samples were not toxic.

March 29, 2015 - Brazos River Basin

Lake Whitney – On March 26 water samples were collected from Juniper Cove Marina. Moderate cell concentrations were found at the Juniper Cove Marina and the samples were classified as slightly toxic. On March 29 Steel Creek and McCown Valley Park were sampled. Steel Creek had moderate cell concentrations and was classified as slightly toxic. McCown Valley had low cell concentrations and was also classified as slightly toxic.

March 25, 2015 - Colorado River Basin

Champion Creek Reservoir – Champion Creek Reservoir was sampled on March 25. Water samples contained no P. parvum cells and the water was classified as not toxic.

March 18, 2015 - Brazos River Basin

Lake Stamford – A mild fish kill was observed on Lake Stamford on March 18. TPWD staff reported that fish species associated with the kill were mostly gizzard shad, white bass, and freshwater drum; however, longnose gar, spotted gar, common carp and channel catfish were also present. Water samples were collected for golden algae (Prymnesium parvum) at the Stamford Marina and the Anchor Marina. Both sites contained extremely high cell concentrations, but the Anchor Marina sample was the only one to be classified as moderately toxic.

Brazos River – The lower Brazos was sampled March 17 at Brazos Bend State Park and at Highway 59. Both sites had no cell concentrations of P. parvum and no toxic water.

March 11, 2015 - Colorado River Basin

Brady Creek Reservoir - A mild fish kill was observed just west of the boat ramp. TPWD staff reported approximately 75 dead fish that included mostly buffalo and carp, but a few longnose gar were also present. Water samples were collected for golden algae (Prymnesium parvum) at the boat ramp and up Brady Creek. Both sites contained moderate cell concentrations, but the boat ramp site was the only one to be classified as low to moderately toxic.

March 3, 2015 - Brazos River Basin

Brazos River, Kirby Reservoir, Hubbard Creek Reservoir – These three sites were sampled and showed no cell concentrations of P. parvum; the water was classified as not toxic.

Lake Stamford – Water samples showed high concentrations of P. parvum, but were classified as not toxic.

February 12, 2015 - Brazos River Basin

Lake Granbury – Water samples were taken February 5 at three locations. The sample from the US Business 377 site contained moderate cell concentrations and was not toxic. All other samples showed no trace of P. parvum.

Possum Kingdom Reservoir – Water samples were taken February 9 and showed no trace of P. parvum.

Lake Whitney – Water samples were taken on February 3. The McCowan Valley Park and Lofers Bend sites contained low cell concentrations and were classified as not toxic. The Steele Creek site showed no trace of P. parvum.

February 9, 2015 - Brazos and Colorado River Basins

Brazos River – The lower Brazos was sampled February 5 and no P. parvum cells were found.

Colorado Basin:

C.J. Kelly and Beal Park ponds in Midland were sampled February 5 and were found to have low cell concentrations and were classified as not toxic.

February 3, 2015 - Brazos River Basin

Lake Sweetwater – Water samples collected on January 31 have confirmed that the fish kill was the result of golden alga. The three sites where water samples were taken all contained extremely high cell counts and were characterized as highly toxic.

January 30, 2015 - Brazos River Basin

Lake Sweetwater - TPWD biologists are investigating a fish kill on Lake Sweetwater. The biologists reported that the dead fish were mostly common carp, but there were a few channel catfish as well. Golden alga is the suspected cause, but has not been confirmed at this time.

January 26, 2015 - Brazos and Rio Grande River Basins

Brazos Basin:

Kirby Reservoir – The boat ramp contained no P. parvum cells. The fishing pier water sample contained low cell concentrations and was not toxic.

Lake Woodson – Water samples contained low cell concentrations and were not toxic.

Hubbard Creek Reservoir – Water sampled from the bridge contained no P. parvum cells, while Stokes Ramp at the dam contained low cell concentrations and was not toxic.

Lake Throckmorton – Samples had no P. parvum cells present.

Fort Phantom Hill Lake – Samples had no P. parvum cells present.

Lake Stamford – Both the marina and west sample site had moderate cell concentrations, but neither was found to be toxic.

Rio Grande Basin:

Lake Ascarate – Lake Ascarate was sampled on January 21 and no P. parvum cells were found at the north or south sample site. The duck pond was found to have low cell concentrations and was not toxic.

January 21, 2015 - Brazos River Basin

Brazos River – The Brazos River was sampled on January 21 and no P. parvum cells were found.

January 8, 2015 - Brazos River Basin

Lake Granbury – Three sites were sampled on January 8. All three sites contained low to moderate cell concentrations and were classified as not toxic.

January 7, 2015 - Brazos River Basin

Kirby Reservoir – The Kirby boat dock was sampled on January 7 and low P. parvum cell concentrations were found and were not toxic.

Lake Daniel – The Daniel boat dock was sampled on January 7 and no P. parvum cells were found.

January 6, 2015- Brazos River Basin

Possum Kingdom Reservoir – Water samples were collected at four sites on January 6. The dam, Johnson Rd., and Deep Elm Arm sites showed no P. parvum cells. The Sandy Beach site had low cell concentrations and was not toxic.

Lake Whitney – Water samples were collected from three sites on January 6. No P. parvum cells were detected at Lofers Bend. The McCowan Valley Park and Steele Creek sites had low cell concentrations and were not toxic.

Tradinghouse Creek Reservoir – Water samples collected on January 6 and contained no P. parvum cells.

January 5, 2015 - Brazos and Colorado River Basins

Lower Brazos River – The lower Brazos River was sampled on January 5 and no P. parvum cells were found.

Colorado Basin:

C.J. Kelly Pond – Water samples from January 5 contained low cell concentrations and were not toxic.

Midland’s Beal Park Pond - Water samples from January 5 contained low cell concentrations and were not toxic.

Comanche Trails Park in Odessa – Water samples collected from January 5 showed no P. parvum cells.

December 15, 2014 - Colorado River Basin

Lake Colorado City, Moss Creek Reservoir, Lake E.V. Spence, Champion Creek Reservoir
These four sites were sampled on December 15. Moss Creek Reservoir had low cell concentrations and was non-toxic. Lake E.V. Spence contained moderate cell concentrations and was not toxic. Champion Creek Reservoir had moderate P. parvum cell concentrations and Lake Colorado City had high P. parvum cell concentrations, with the water at Lake Colorado City classified as slightly toxic and the water at Champion Creek Reservoir classified as highly toxic.

December 9, 2014 - Brazos River Basin

North Anson Lake, Hubbard Creek Reservoir, Lake Stamford, Lake Sweetwater
These four sites were sampled on December 9. Water from Stokes ramp at the dam on Hubbard Creek Reservoir had zero P. parvum cells. Water from North Anson Lake, the east end bridge of Hubbard Creek Reservoir, Stamford Reservoir and Lake Sweetwater had low cell concentrations of P. parvum and no toxic water.

November 19, 2014

Rio Grande Basin – A fish kill occurred along the Pecos River within Amistad National Recreational Area (NRA). Amistad NRA staff reported that the fish kill included gar, largemouth bass, white bass, white crappie, sunfish, shad, catfish and minnows. Six water samples were collected for golden algae (Prymnesium parvum) and four were analyzed for toxicity. All four water samples contained high cell concentrations and were characterized as highly toxic.

September 25, 2014

Colorado River Basin - An on-going fish kill at Lake Colorado City was reported by Lake Colorado State Park staff. Approximately 300-500 fish have died and are at different stages of decay. The fish range from large carp to small sunfish/bait fish. They are believed to have died near the dam/southern end of the lake based on two days of strong northwestern wind, which has pushed the fish onto the state park shoreline. Two water samples collected for golden algae contained high cell concentrations and was characterized as highly toxic.

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Take Action
  • Report Kills - If you see a fish kill or suspect golden alga, contact one of TPWD's 24-hour communications centers at 512-389-4848 (Austin) or 281-842-8100 (La Porte).
  • Get the Facts - TPWD has collaborated with the Texas Commission on Environmental Quality and other entities to produce a golden alga information card. Download a PDF from the TCEQ website or request a free hard copy from TPWD at hab@tpwd.texas.gov.
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