Listen to the Song – Little King of the Gravelbed
The complete lyrics are included in the companion book, Our Jewels in the Water, allowing readers to follow every song while learning about Britain’s remarkable freshwater fish.
Enjoying the music?
The companion book Our Jewels in the Water includes the full lyrics, additional stories, exclusive photographs and beautiful illustrations for every species.
The Bullhead
King of the Riverbed
“Beneath the rocks, where the current rushes overhead, lives a tiny warrior whose courage is far greater than its size.”
Species Profile
The Bullhead (Cottus gobio), often known as the Miller’s Thumb, is one of Britain’s most distinctive freshwater fish. With its broad flattened head, large fan-like pectoral fins and mottled camouflage, it is perfectly adapted for life among stones in fast-flowing rivers and streams.
Although seldom longer than 15 centimetres, the Bullhead is a fierce little survivor. Unlike many fish that swim freely in open water, it spends almost its entire life hugging the riverbed, darting from rock to rock in search of food.
Clive’s Story
As a boy exploring the River Ely in Cardiff, South Wales, I was always fascinated by Bullheads.
Unlike the Stone Loach, which disappeared in a flash beneath the gravel, the Bullhead often stood its ground. Lift a stone and there it was—wide-headed, staring back as if challenging the much larger creature looking down upon it.
It seemed fearless.
I remember carefully lowering the stone again, amazed that such a small fish could possess so much character. Those encounters taught me that courage isn’t measured by size, but by spirit.
Natural History
The Bullhead thrives in clean, cool, well-oxygenated rivers with stony or rocky bottoms.
It feeds mainly on insect larvae, freshwater shrimps, worms and other tiny creatures found among the stones. Rather than swimming continuously, it moves in short bursts, using its powerful pectoral fins to steady itself against the current.
During the breeding season, the male becomes a devoted guardian. After the female lays her eggs beneath a stone, he remains to protect them until they hatch, fanning fresh water across them and fiercely defending the nest from intruders.
Interesting Facts
- Scientific name: Cottus gobio
- Common name: Bullhead or Miller’s Thumb
- Family: Cottidae
- Average size: 8–15 cm (3–6 inches)
- Habitat: Fast-flowing rivers with rocky or gravel beds
- Diet: Insect larvae, freshwater shrimps, worms and small invertebrates
- Lifespan: Around 5 years
- Status: Widespread throughout Britain
Behind the Song
When writing King of the Riverbed, I wanted to celebrate the Bullhead’s remarkable bravery.
It isn’t the largest fish, nor the fastest, yet it commands respect through its determination. Hidden beneath the stones, it quietly rules its own little kingdom, defending its home with surprising courage.
The song is a tribute to one of the river’s smallest but most resilient characters.
Conservation
Bullheads depend on clean rivers with plenty of oxygen and healthy gravel beds.
Pollution, excessive sediment and the removal of natural stones can reduce the places where they feed, shelter and breed.
Protecting Britain’s rivers ensures that this tiny guardian continues to thrive beneath the current.
Clive’s Reflection
The Bullhead reminds us never to underestimate the small or the overlooked.
Every river has its hidden champions—creatures that quietly play their part without recognition.
Perhaps that’s why I’ve always admired this little fish. It asks for nothing, yet gives everything to the river it calls home.