The Arctic grayling (Thymallus arcticus) in the Tengis River is one of the signature species of northern Mongolia’s pristine headwaters especially around the Tengis–Shishged basin, which flows into the Yenisei system via Russia. Here’s a quick overview tailored for your context at Taimen Lodge:
Species Overview
- Scientific name: Thymallus arcticus baicalensis (the Baikal grayling subspecies)
- Appearance: Elegant, with a high, sail-like dorsal fin marked by blue, purple, and red spots. Silvery body with fine scales and subtle lavender hues.
- Average size: 30–45 cm (12–18 inches), with trophy fish exceeding 50 cm.
- Diet: Aquatic insects (mayflies, caddisflies, stoneflies), small crustaceans, and occasionally fish eggs or small fry.
Habitat in the Tengis
The Tengis River offers ideal conditions — cold, oxygen-rich, crystal-clear water fed by mountain springs and snowmelt. Grayling are typically found:
- In riffles and tailouts below fast-moving pools.
- Near gravel bottoms and rocky banks where insect life is abundant.
- During warm months (June–September), they move upstream toward cooler headwaters.
Fly Fishing for Grayling
- Flies: Small dry flies and nymphs imitate local hatches (Adams, Elk Hair Caddis, Pheasant Tail, Hare’s Ear, Griffith’s Gnat).
- Tackle: 3–5 wt rods, floating line, and fine tippets (5X–6X).
- Technique: Short, accurate casts into feeding lanes. Grayling readily rise to well-presented dry flies, making them a perfect target for beginners and experienced anglers alike.
🏕 At Taimen Lodge
Grayling fishing is often paired with taimen expeditions, offering anglers a lighter, more technical experience between taimen sessions. In the upper Tengis camps, they provide steady action in gin-clear water — ideal for photography and teaching guests dry-fly presentation.
