Montana's Fin-tastic Fish: A Guide to Fish Species in Montana

As a long-time outdoor writer and adventurer who’s spent over a decade exploring the waters of the Treasure State, I’m often asked about the incredible variety of fish species Montana offers. From the iconic trout to lesser-known but equally fascinating inhabitants, Montana’s rivers, lakes, and streams are a haven for anglers and nature enthusiasts alike. This guide will dive deep into the types of fish in Montana, covering identification, habitat, and conservation efforts. Understanding the diverse fish species Montana boasts is crucial for responsible angling and appreciating the state’s rich biodiversity.

Trout: The Crown Jewels of Montana's Fisheries

When people think of fishing in Montana, trout immediately come to mind. And for good reason! Montana is world-renowned for its trout fishing, and several species thrive in its cold, clear waters.

Rainbow Trout (Oncorhynchus mykiss)

Perhaps the most commonly encountered trout, Rainbow Trout are known for their vibrant colors and aggressive strikes. They’re adaptable and can be found in a wide range of habitats, from large rivers like the Missouri to smaller streams and lakes. According to the Montana Fish, Wildlife & Parks (FWP), Rainbow Trout are not native to Montana but were introduced in the late 19th century and have become incredibly popular. Learn more about Rainbow Trout from Montana FWP.

Brown Trout (Salmo trutta)

Brown Trout are a favorite among fly fishers for their cunning and size. They prefer cooler, slower-moving waters and are often found holding near structure. Browns are also not native, introduced from Europe, but have established thriving populations. They can live for over a decade and grow to impressive sizes. REI's trout fishing guide offers excellent tips for targeting these challenging fish.

Cutthroat Trout (Oncorhynchus clarkii)

This is where things get really interesting. Cutthroat Trout are native to Montana, and several distinct subspecies exist, each with unique characteristics and conservation concerns. The Yellowstone Cutthroat Trout, for example, is particularly iconic and faces threats from non-native lake trout. The FWP has extensive programs dedicated to Cutthroat Trout conservation. Explore Cutthroat Trout conservation efforts. Subspecies include:

• Yellowstone Cutthroat Trout: Found primarily in the Yellowstone River drainage.
• Westslope Cutthroat Trout: Inhabits western Montana drainages.
• Redband Trout: A variation found in the eastern part of the state.

Brook Trout (Salvelinus fontinalis)

While technically a char and not a true trout, Brook Trout are often grouped with them. They are another non-native species, but have become well-established in many Montana waters, particularly at higher elevations. They prefer cold, clear streams and lakes.

Beyond Trout: Other Notable Montana Fish Species

Montana’s aquatic ecosystems support a diverse range of fish beyond the trout family. Here’s a look at some other important species.

Walleye (Sander vitreus)

Walleye are a popular game fish found in many of Montana’s larger reservoirs, such as Fort Peck and Canyon Ferry. They are known for their excellent table fare and aggressive feeding habits. The USDA Forest Service provides information on fishing access in national forests, where many Walleye populations thrive. Find fishing access points on National Forest lands.

Northern Pike (Esox lucius)

Northern Pike are apex predators found in lakes and slow-moving rivers. They are known for their toothy grin and powerful strikes. They can grow to impressive sizes and provide a thrilling angling experience. They are considered an invasive species in some areas, and management efforts are in place to control their spread.

Yellow Perch (Perca flavescens)

Yellow Perch are a common panfish found in many Montana lakes and reservoirs. They are relatively easy to catch and provide a good source of food. They are often targeted by families and beginner anglers.

Mountain Whitefish (Prosopium williamsoni)

Native to the Rocky Mountain region, Mountain Whitefish are a unique and often overlooked species. They prefer cold, clear streams and rivers and are an important part of the ecosystem. They are a fun fish to target on a fly rod.

Sucker Species (Various)

Montana is home to several species of suckers, including the Longnose Sucker and the Flannelmouth Sucker. While not typically targeted by anglers, they play a vital role in the aquatic ecosystem as bottom feeders.

Non-Native and Invasive Fish Species in Montana

The introduction of non-native fish species has had a significant impact on Montana’s fisheries. While some, like Rainbow and Brown Trout, have become popular game fish, others pose a threat to native populations.

Lake Trout (Salvelinus namaycush)

Lake Trout are a major threat to Yellowstone Cutthroat Trout in Yellowstone Lake. They are aggressive predators and compete with Cutthroat Trout for food and habitat. Extensive efforts are underway to control their population. The National Park Service is heavily involved in Lake Trout management in Yellowstone. Learn about Lake Trout management in Yellowstone.

Common Carp (Cyprinus carpio)

Common Carp are an invasive species that degrades water quality and outcompetes native fish. They are found in many of Montana’s rivers and lakes.

Goldfish (Carassius auratus)

Believe it or not, Goldfish are becoming a problem in some Montana waters. Released from aquariums, they can survive and reproduce, competing with native species.

Responsible Angling and Conservation in Montana

Protecting Montana’s incredible fisheries requires responsible angling practices and a commitment to conservation. Here are a few key things to keep in mind:

• Know the Regulations: Montana FWP publishes detailed fishing regulations each year. Be sure to familiarize yourself with the rules for the waters you plan to fish.
• Practice Catch and Release: Releasing fish, especially native species, helps maintain healthy populations.
• Don't Transport Aquatic Organisms: Prevent the spread of invasive species by thoroughly cleaning, draining, and drying your boat and gear. This is crucial!
• Support Conservation Efforts: Consider donating to organizations that work to protect Montana’s fisheries.
• Follow Leave No Trace Principles: Leave No Trace principles apply to all outdoor activities, including fishing. Pack out all trash, minimize your impact on the environment, and respect wildlife.

Resources for Further Exploration

Here are some helpful resources for learning more about fish species in Montana:

• Montana Fish, Wildlife & Parks (FWP): https://fwp.mt.gov/
• National Park Service (NPS): https://www.nps.gov/
• USDA Forest Service (FS): https://www.fs.usda.gov/
• Leave No Trace Center for Outdoor Ethics: https://lnt.org/
• REI Expert Advice: https://www.rei.com/learn/

I hope this guide provides a comprehensive overview of the fish species Montana has to offer. Whether you’re a seasoned angler or simply curious about the state’s aquatic life, there’s always something new to discover. Remember to fish responsibly and help protect these incredible resources for future generations. If you're planning a guided fishing trip, check out Montana Fishing Guides for reputable outfitters. And for information on camping near popular fishing spots, see our guide to Montana Campgrounds.