Gila trout

What it is, and why it matters

Of the five fish on this list, this is the one that will make you plan a trip.

The Gila trout is a small, iridescent, gold-sided fish that lives in a handful of cold mountain streams in the southwestern corner of New Mexico, and nowhere else in the world except a few streams over the Arizona line. It is one of the rarest trout in the United States. It was among the first fish in North America to get a conservation-focused management program, in the 1920s, before anyone used that language, and it has spent the six decades since as one of the hardest-won recoveries in American fisheries.

Everything alive today traces back to five surviving populations. The U.S. Fish and Wildlife Service calls them the five genetically distinct lineages: Main Diamond Creek, South Diamond Creek, Whiskey Creek, Iron Creek and Spruce Creek. By the 1950s the range had collapsed to that. Every restored population in the Gila country was founded from one of those five.

Which means a single fire in a single canyon is not a local event. It is a species-level event.

On June 21, 2026, lightning started a fire on Sacaton Mountain. It burned into Iron Creek. On July 14, biologists from the state and the Forest Service, working alongside firefighters, went into the Gila Wilderness and pulled 78 Gila trout out of that creek by hand, put them on a helicopter, and flew them the length of the state to a federal hatchery.

All 78 survived.

Those fish were not evacuated because they were pretty. They were evacuated because, as the state's Gila trout biologist put it, "these fish are important from a genetics standpoint as they represent the population of Gila trout that evolved in the Middle Fork of the Gila River." One of five lineages, in one creek, with a fire coming.

That is the fish. When you catch one, you are holding an animal that exists because people have been willing, repeatedly, to go to considerable trouble.

Identifying it

Geography settles most cases before you look at the fish

Gila trout and Rio Grande cutthroat do not overlap in the wild and never have. Gila trout occur only in the Gila and San Francisco drainages in the southwest. Rio Grande cutthroat occur only in the Rio Grande, Canadian and Pecos basins in the north.

In the Gila country it is not a Rio Grande cutthroat. In the Pecos it is not a Gila trout. That one fact eliminates the most common confusion before it starts.

Gila trout vs rainbow trout

Rainbows were stocked across this country for decades. This is the comparison you will actually need.

Hybrids

Gila trout and rainbow trout interbreed and produce fertile offspring. Because rainbows were stocked through this country for most of a century, hybridization is what erased pure Gila trout wherever the two mixed. It is the entire reason recovery work is built around barriers: natural waterfalls and constructed structures that stop nonnative fish swimming up into a restored reach.

Same honesty as with cutthroat. You cannot confirm genetic purity by eye or from a photograph. The barriers exist precisely because the problem is invisible.

For your challenge photo

Side view, jaw visible, fish over water. Gila trout are small and the diagnostic marks (spots confined to the upper body, copper on the gill plate, the yellow slash) are subtle and easy to lose to glare. Get the flank square to the camera. Do not chase a better frame.

Range and status in New Mexico

Cold headwater mountain streams in the Gila and San Francisco drainages of southwestern New Mexico, largely within the Gila National Forest and its wilderness areas.

Individual waters are not named here, including the waters where fishing is legal. The legal fishery is a specific, closed, agency-published list attached to a free permit you have to obtain from the state anyway. That list comes with the rules attached, it is current, and it reflects decisions made by the people responsible for the fish. A third-party copy adds nothing but a version that can go stale.

Status.

• Federally threatened. Listed endangered in 1967, reclassified to threatened in 2006.
• Five genetically distinct lineages remain: Main Diamond, South Diamond, Whiskey, Iron and Spruce Creeks.
• Recovery has rebuilt pure populations across a substantially larger footprint than the eight populations across roughly thirty miles that existed in 2014.

Angling is legal only because of a special federal rule issued with the 2006 downlisting, which allows New Mexico and Arizona to write angling regulations for a listed species in cooperation with the federal government. Before that there had been no legal sport fishing for Gila trout for nearly fifty years.

The conservation story

The collapse. Nonnative trout arrived; hybridization and competition did the rest. By the 1950s the species was down to five streams. New Mexico closed Gila trout waters to angling. The fish was listed as endangered in 1967, six years before the modern Endangered Species Act existed, and carried forward under it in 1973.

The recovery took sixty years. Four repeating moves.

Barrier construction. A natural waterfall or a built structure that stops nonnative fish moving up into a restored reach.

Renovation. Removing nonnative trout from the water above that barrier.

Repatriation. Moving pure Gila trout from one of the five remnant lineages into the cleared stream.

Hatchery propagation and back-crossing. Back-crossing introduces genetic material from a related population with high diversity, then breeds the resulting hybrids back with pure individuals from the population that lacks it. The federal service has used it for the Spruce Creek lineage, to restore diversity after the 2012 Whitewater-Baldy Complex Fire.

That work produced the 2006 downlisting, and the downlisting produced the fishery. You can fish for this species at all because the recovery worked.

The current threat is fire, and it is not hypothetical.

The fire itself rarely kills the fish. What follows it does. Burned ground turns water-repellent, so the first hard monsoon rain runs off bare hillslopes instead of soaking in, picks up loose channel material, and bulks into a debris flow. USGS has measured post-fire runoff stripping dissolved oxygen out of rivers and killing fish, and the sediment that follows degrades aquatic habitat downstream for years. As the state's Gila trout biologist put it, "post-fire flooding can impact fish habitat for years to come."

That is why the emergency salvage happens during the fire rather than after. Waiting until the smoke clears means waiting until the rain has already come.

There is a hopeful detail in the biology. Gila trout shelter in groundwater-seep pools, which is how a population survives a burn at all. Those pools are the reason there is ever anything left to rescue.

Other threats: drought and shrinking flows in small streams, and continued contact with nonnative trout, which is what the barriers are for.

Handling this fish, and when not to fish for it

A federally threatened species whose entire global population descends from five surviving lineages, in country where a single fire can take out a whole creek.

You are, briefly, holding a meaningful fraction of something.

When not to fish at all

How to handle it

Steps 1 through 8 are NMDOW's own published Catch and Release Tips, 2026–2027 rules booklet, p. 21.

1. Land the fish quickly and don't play it to exhaustion.
2. Use a landing net whenever possible.
3. Keep the fish in the water.
4. Do not squeeze or grab any part of the fish. Wet your hands first if you must handle the fish.
5. Gently remove the hook.
6. If the hook is swallowed deeply, cut the leader.
7. Let a tired fish recover. Hold it by the tail in the water, supported from below, until it swims away.
8. Never toss or throw a fish back into the water.

The law does not require the following. We are asking you to. Pinch your barbs. Keep air exposure to a few seconds. Never lift a fish by the jaw or hold it vertically. Wet everything the fish touches.

The photograph problem

The challenge requires a photo, and much of this water is catch-and-release by regulation. Camera ready before the fish is.

• Fish in the water or an inch above it, over the net, never over rocks or a dry bank.
• One frame, maybe two.
• If the fish is struggling, put it back and take no photo. The cost is one species on a list with no deadline.

And frame the fish, not the place. A recognizable landform behind a Gila trout is a location disclosure with a very long half-life. This is the species where that matters most.

What the law requires

A free Gila Trout Fishing Permit is required, and it covers a specific list of named waters published by the agency. It costs nothing, it is available online, by phone, at license vendors and at department offices, and it attaches to your fishing license.

The agency asks one thing in return, and it is worth honoring: "Please do not obtain this permit unless planning to fish in one of the waters listed above." Pulling a permit you will not use distorts their numbers.

The rules are not uniform across that list. Some of those waters are catch-and-release by regulation, with a tackle restriction (artificial fly or lure, single barbless hook). Others allow limited harvest. Some carry a seasonal opening and are closed for much of the year. There is no single "Gila trout rule," and anyone who gives you one is wrong.

Several streams in this same country are closed to all fishing, year-round. They are near the open water. The permit does not open closed water. Know which is which before you walk in.

Standard license, validations and stamps apply, and stamps are required on Forest Service and Bureau of Land Management land, which is essentially all of this country. An angler with a valid license and the free permit but without the required stamp is out of compliance.

Chumming and baitfish are prohibited in every Special Trout Water.

What the law does not require

No temperature rule exists. Whether you fish a small creek at 70 degrees is your call alone.