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Sept. 16, 2011

Biologists Collect Fish Threatened by Drought in Upper Brazos River

AUSTIN – Today scientists collected fish threatened by drought in the upper Brazos River and take them to Possum Kingdom state fish hatchery to weather the drought, with plans to use them to restock the river later. Similar collections of other aquatic species imperiled by drought are being considered for Central and West Texas.

The pernicious drought and record-setting heat of the Texas summer of 2011 has nearly dried up the upper Brazos River and its forks — Clear Fork, Double Mountain Fork, and the Salt Fork. Two small prairie minnows, the sharpnose shiner and smalleye shiner, are holed up in dwindling pools in the upper Brazos, where it’s hot, muddy and salty.

“These fish are a unique part of Texas’ natural heritage,” said Gene Wilde, PhD, a Texas Tech University professor of fish ecology who has spent much of his life studying fish in west Texas rivers. “They’re found only in Texas in the Brazos River, and nowhere else in the world. Right now, they’re the most abundant fish in the upper Brazos. When it comes to prey availability for game fish like catfish or largemouth bass, these fish drive the system. If we lose them, we won’t have the same ecological vitality.”

The smalleye shiner (Notropis buccula) and sharpnose shiner (Notropis oxyrhynchus) are both candidates for listing as threatened or endangered under the federal Endangered Species Act, in effect on the waiting list for listing consideration. When the Brazos and its forks are running, the minnows make a living by picking bugs out of the water or sifting through the sandy dunes formed by river currents. They can migrate more than 100 miles upstream to spawn and release their buoyant eggs to float downstream to hatch.

“Historically, these two fish occurred throughout the Brazos down to and below College Station,” said Kevin Mayes, a Texas Parks and Wildlife Department aquatic biologist and rivers expert. “But like other prairie minnows of the Great Plains, their habitat — turbid rivers with shifting sands — has been altered by reservoir construction.”

The fish need an optimum range of more than 50 river miles to spawn. Since the 1950s drought, four dams have been built that bisect the central Brazos into shorter reaches ranging from 35 to 114 miles from Possum Kingdom reservoir to Lake Waco. However, the lower Brazos from Waco to the coast offers 415 miles of fish passage, so scientists are considering relocating the two fish into the upper and lower river as well as restocking the upper Brazos in future months.

Scientists have been concerned about the sharpose shiner and smalleye shiner for years, and had developed plans to collect a safety net of specimens as a hedge against disaster, a plan prodded to action by the current record drought.

“They’ve made it through hot summers before, but this is different,” said Wilde. “Flows at all of the stream gages heading down to Possum Kingdom are reading zero.”

TH 2011-09-16

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