Siberian lenok: description, species, lifestyle, habitat, reproduction and catching

Siberian Lenok: Description, Species, Lifestyle, Habitat, Reproduction, and Fishing. The Siberian lenok (Brachymystax lenok) is a striking and beautiful member of the salmon family, a true gem of the freshwater bodies of Siberia and the Far East. It is a purely freshwater fish and does not migrate offshore, unlike migratory salmon. Lenok is known by many local names: "Maigun" among the Evenks, "limba" among the Yakuts, and in literary sources, it is often called "Siberian trout." The first scientific description of lenok was given by the famous explorer and naturalist Peter Pallas, who caught and described this fish in the waters of the Yenisei River in 1773.

The lenok is a true "river leopard": its coloring is captivating—from golden-bronze to silver, with numerous black spots and bright red markings on its sides. During spawning, the fish becomes especially striking—the red spots intensify, making it resemble a tropical predator. Unfortunately, the lenok population has significantly declined due to human impacts—hydroelectric power station construction, pollution, and overfishing. In some regions, it is protected, and in some bodies of water, it is listed as an endangered species.

Lenok size and weight

Lenok is a fairly large freshwater fish, although it grows slowly compared to other salmonids. Adults average 2–6 kg in weight and 40–70 cm in length. In favorable conditions, trophy specimens weighing 8–10 kg and up to 1 meter in length are found. The age of the fish can be determined by its size and coloration: the older the lenok, the darker its scales with golden highlights.

Lenok grows slowly: by the age of one year, the fry reach only 10–15 cm, and by the age of five to seven, 40–50 cm and 1–2 kg. Their lifespan is 13–15 years, sometimes reaching 18–20 years. Two forms of lenok are commonly distinguished: blunt-snouted and sharp-snouted. They differ in snout shape but are often found in the same bodies of water.

On the Putorana Plateau, lenok reaches particularly impressive sizes. Here, in the crystal-clear, cold, and oxygen-rich rivers and lakes, the fish grow more slowly but reach peak condition. Specimens weighing 4–7 kg and more are common in the Yerachimo, Tutonchana, Severnaya, Sukhaya Tunguska, and other rivers, where abundant food and the absence of significant anthropogenic impact allow lenok to live long lives and gain weight.

Lenok spawning

Lenok reach sexual maturity at 5–7 years of age. Spawning occurs in the same river where the fish live permanently—they swim upstream into clean streams and channels with pebble or rocky bottoms and strong currents. Spawning season is late May–June, lasting about a month. Water temperature is 3–5°C.

The female lays eggs in batches, each containing 8,000 to 12,000 eggs (the smallest among salmonids). The eggs are buried in the substrate. The male fertilizes the clutch. During spawning, the coloration intensifies, with bright red spots appearing on the sides. After spawning, the fish do not immediately leave but remain in place and actively feed. This begins the pre-spawning and post-spawning feeding frenzy, which lasts 10-15 days. The lenok then migrate back to their usual habitats.

The fry hatch after a month and a half. For the first few days, they feed on the remains of their yolk sac, then switch to small crustaceans and insects. They grow slowly and migrate downriver in search of deep wintering grounds.

Lenok habitats

Lenok inhabits mountain rivers and lakes in Siberia, the Far East, Korea, Kazakhstan, and Mongolia. It prefers clean, cold, oxygen-rich water with fast currents, riffles, rocks, and gravel. It does not tolerate swampy rivers, calm sandy areas, waterfalls, or chaotic waters. Its ideal habitats are fast-flowing mountain rivers and cold glacial lakes.

Main areas:

• Rivers of Siberia (Yenisei, Lena, Amur and their tributaries)
• Lake Baikal and its tributaries
• Rivers of Primorye and the Far East
• Lake Markakol in Kazakhstan
• The Tugur, Yalu and other rivers in the Far East

In some regions (for example, the Ob River), the population has practically disappeared due to hydroelectric power plants and pollution. In the Urals, lenok is found in the Vargan and Utka rivers, but it does not venture west of the Urals due to unsuitable climatic conditions.

Lenok thrives on the Putorana Plateau: in crystal-clear rivers (Erachimo, Tutonchana, Severnaya, Sukhaya Tunguska, Nimde, Agata, Musima, Anadyakan) and lakes (Lama, Keta, Khantayskoye, Sobachye, Ayan), the fish reach their maximum size and population density thanks to the absence of civilization, strong currents, and abundant food. Here, lenok are among the most coveted trophies for expedition fishermen.

Lenok lifestyle

Lenok is a purely freshwater fish and does not migrate through the sea. It is a typical predator: its diet includes fish (both small and large), insect larvae, worms, mollusks, mosquitoes, beetles, frogs, and even rodents that have fallen into the water. Young lenok feed on crustaceans and insects, while adults become true hunters.

The fish is active at any time of day, but prefers dawn and dusk. In hot weather, it hides in cool pools and under rocks. In the fall, it becomes especially active, seeking out large rivers for wintering. In winter, it stays in deep holes and depressions. Lenok is a solitary fish, but during spawning and pre-spawning runs, it gathers in small groups (up to 20 individuals). Larger fish often stay in pairs.

The life cycle of lenok

Lifespan: 13–15 years, sometimes up to 18–20 years. During its lifespan, the fish spawns 4–5 times. The annual cycle is similar to that of other salmonids: after wintering, there is a pre-spawning run, spawning in late spring–early summer, post-spawning feeding frenzy, migration to familiar locations, summer in depressions, and autumn foraging for wintering holes.

Methods of catching lenok

The best time to catch lenok is immediately after spawning (June–July) and late August–October. In midsummer, lenok bites poorly. The most active times are dawn and dusk.

Fishing methods:

• Fly fishing from the shore on narrow rivers
• Spinning from a boat on wide rivers
• The load and bait are carried along the bottom

Nozzles:

• Living: larvae, worms, insects
• Artificial: bright oscillating and rotating lures, wobblers

The hooks are large treble hooks, camouflaged with bright thread. The bite is sharp and quick, requiring a quick hookset. Landing is challenging: the lenok tumbles, twitches the line from side to side, and hides in snags. To avoid losing the fish, the fish is brought behind the fish's back, using a taut line. In winter, they are caught with balance lures or vertical spoons.

Lenok fishing requires skill, patience, and respect for the fish. It's not for the lazy—the fish are wary, and the slightest mistake can result in a breakaway.

Conclusion

The Siberian lenok is a true Siberian trout, a beautiful, strong, and wary predator that deserves special treatment. Catching one is a treat for any angler. On the Putorana Plateau, lenok thrives in ideal conditions: in pristine rivers and lakes, it reaches its maximum size and maintains healthy populations thanks to the absence of civilization and abundant food. Here, amid canyons and the polar day, lenok remains one of the most coveted trophies, a reminder of the pristine beauty of northern nature.

Photos of trophy lenok from our tours