The color has some apocalypse believers suggesting that OC Fisher is an early sign of the end of the world, but Texas Parks and Wildlife Inland Fisheries officials say the bloody look is the result of Chromatiaceae bacteria, which thrive in oxygen-deprived water.
"It's just heartbreaking," said Charles Cruz, a fish and wildlife technician with Texas Parks and Wildlife in San Angelo, Tex.
Texas is experiencing major drought this summer, with 75 percent of the state's area in an "exceptional" drought, the highest level, according to the National Drought Mitigation Center (NDMC). The state had hoped for some relief from Tropical Storm Don last week, but the system fizzled and brought only an inch or two of rain to areas near the coast.
The drought has taken its toll on a number of reservoirs in West Texas, Cruz told LiveScience. OC Fisher has never been completely full, Cruz said, but it was stocked with catfish, bass, sunfish and other popular targets for fishermen.
"We surveyed the lake, I believe it was last year, and we had a pretty good fish population out there," Cruz said. "It was pretty sickening going out there, watching lake levels just drop and drop and drop and seeing these nice trophy-sized bass just floating dead."
As of last week, all that remained of the lake was a small pond a few feet deep, Cruz said. There were thousands of dead fish, he said, but no sign of life.
Pictures of this blood-red pool circulated online in fishing forums and caught the notice of Indiana preacher Paul Begley, who said in a YouTube video that the lake might be evidence of the apocalypse as predicted by the Biblical book of Revelation. [End of the World? Top Doomsday Fears]
"The second angel poured out his bowl on the sea, and it turned into blood like that of a dead person, and every living thing in the sea died," the passage Begley cited reads. "The third angel poured out his bowl on the rivers and springs of water, and they became blood."
Begley may not have any more luck at predicting the end of the world than did Harold Camping, the radio preacher who set the date for May 21, 2011. But for as long as the drought persists, the OC Fisher reservoir is a reservoir no longer.