Part Eight: Rescuing silvery minnows like ‘slapping a Band-Aid on a severed limb’

The endangered species is only a symptom within a larger system in peril, conservationists say 

SOCORRO COUNTY, N.M. —Mallory Boro and Keegan Epping comb through the fine net for any silvery minnows left in the drying ponds of the Rio Grande at San Acacia. Fish litter the riverbed, inhabiting increasingly smaller ponds where the river breaks. (Photo by Diana Cervantes for Source NM)

Four team members, left, at the U.S. Fish and Wildlife service pull on their shoes before a fish rescue. Mallory Boro, Lyle Thomas, Keegan Epping and Thomas Archdeacon often work extended hours in the heat to comb through more than 18 miles of riverbed that can dry nearly overnight. (Photo by Diana Cervantes for Source NM)

A vehicle in the dry riverbed of the Rio Grande. The San Acacia Reach is a stretch of the Rio Grande that has dried nearly every year for the past 25 years. (Photo by Diana Cervantes for Source NM)

The U.S. Fish and Wildlife Service team pulls seine nets through almost any pool left in the drying riverbed. The rescuers check each pool for silvery minnow. They throw back the other species of fish. The pools are often hot and poorly oxygenated. (Photo by Diana Cervantes for Source NM)

Silvery minnow are primarily found in a stretch of the Rio Grande between Cochiti Dam and Elephant Butte — if there’s enough river to support the fish. “If some catastrophic event occurs, they’re a lot more vulnerable because it’s more likely to affect all of them,” said Thomas Archdeacon, left. (Photo by Diana Cervantes for Source NM)

Some of the pools range in depth from a few feet to a few inches. Under the June sun, they rapidly shrink. Archdeacon noted that the pools were appearing earlier each year, and the river is drying faster. (Photo by Diana Cervantes for Source NM)

Lyle Thomas places a silvery minnow found in a pool into an oxygenated holding tank on the back of the carts. The fish are transported to better environments, but their survival rate is low, since the fish are often unhealthy from being in the pools. (Photo by Diana Cervantes for Source NM)

Silvery minnows are placed in an oxygenated tank for transport upstream. Fish who are rescued from pools have a much lower survival rate that fish pulled from running water. Archdeacon estimated there's only a 5% to 10% survival rate for rescued fish. (Photo by Diana Cervantes for Source NM)

The U.S. Fish and Wildlife team measures the temperatures of each pond, noting what kind of conditions the rescued fish are coming from. At right, Mallory Boro discards a fish from the net, when the pool is too small to return it, searching for silvery minnow. (Photos by Diana Cervantes for Source NM)

From left, a gizzard shad in the streambed. At right, fish species of all kinds turn muddy and brown from struggling to find water in the San Acacia reach, dying by the hundreds. (Photos by Diana Cervantes for Source NM)

Shoals of silvery minnows used to swim nearly 3,000 miles of the Rio Grande’s length from the Gulf of Mexico to Española, N.M., and along much of the Pecos River. (Photo by Diana Cervantes for Source NM)

When rescuers find a silvery minnow, they note its origin (if it's wild or from a hatchery), and what condition the pool was in. (Photo by Diana Cervantes for Source NM)

When the water dries fish gasp for hours in the streambed until they die.(Photo by Diana Cervantes for Source NM)

Silvery minnows in the oxygenated tank.