Why is the Grayling known as the 'lady of the stream'?

They earned this title due to their graceful appearance in the water, their beautiful silvery-grey scales, and their spectacular, flowing dorsal fin.

Can I keep a Grayling in my garden pond?

Generally, no. Standard garden ponds lack the fast-flowing, highly oxygenated, and consistently cold water that Grayling require to survive. They need specialised stream setups or large, flowing natural waters.

What do Grayling eat?

Their natural diet primarily consists of aquatic invertebrates such as freshwater shrimp, mayfly nymphs, and caddisfly larvae, as well as insects snatched from the water's surface.

Do Grayling actually smell like thyme?

Yes, freshly caught Grayling secrete compounds in their mucous layer that give off a faint, herbal aroma reminiscent of wild thyme.

How large do Grayling grow?

Most adult Grayling reach between 30 and 40 cm in length, though exceptional specimens in rich habitats can grow up to 50 cm or slightly more.

FreshwaterTropicalAdvanced

Grayling

Thymallus thymallus

The European Grayling is a striking coldwater salmonid prized by anglers for its beautiful, sail-like dorsal fin and preference for fast-flowing, oxygen-rich rivers.

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Ideal Conditions

Temperature: 4 – 18 °C
pH range: 6.5 – 8
Hardness: 5 – 15 dGH
Adult size: 30 – 50 cm
Large stream-system pond or fishery: 5,000 litres+
Lifespan: 7 – 14 years
Diet: Carnivore
Water flow: High
Preferred setup: Requires a highly oxygenated, fast-flowing riverine environment with a gravel or pebble substrate.

About the Grayling

Known affectionately as the 'lady of the stream', Thymallus thymallus is a highly esteemed freshwater fish native to Europe. Characterised by a silver-grey body, a distinctive violet-tinted dorsal fin, and an aroma vaguely reminiscent of wild thyme, it is a flagship species for clean, highly oxygenated river habitats. They are deeply valued in the angling community as a premium sport fish.

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Where Grayling comes from

Native range

Europe, Palearctic

Countries / regions

United Kingdom, France, Germany, Norway, Sweden, Finland, Russia

Habitat

Fast-flowing, highly oxygenated upland and chalk rivers over gravel substrates.

Widespread across northern and central Europe, extending eastward to the Ural Mountains.

Similar species

Brown Trout
Salmo trutta
Arctic Grayling
Thymallus arcticus

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Brown Trout
Salmo trutta
Share the exact same fast-flowing, highly oxygenated coldwater habitat in the wild and occupy slightly different feeding niches.
Great
Barbel
Barbus barbus
Excellent companions for the deeper, faster-flowing stretches of a large riverine system, as they will ignore the Grayling.
Great
Eurasian Minnow
Phoxinus phoxinus
While they are natural habitat companions, very small minnows may occasionally be opportunistically eaten by large adult Grayling.
Compatible with caution
Northern Pike
Esox lucius
Pike are apex predators and will actively hunt and consume Grayling.
Not recommended
Common Carp
Cyprinus carpio
Carp require warmer, slower-moving water and will struggle in the cold, torrential flow required by Grayling.
Not recommended

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