Fascinating Fact
Barbel have sensitive barbels near the mouth, which help them find food on the riverbed in cloudy water.
River fish live in habitats that can change quickly, including water speed, depth, temperature, and oxygen levels. Different species prefer different conditions, such as fast, stony runs or slower, weedy stretches. Many fish use cover like roots and overhanging banks to avoid predators, rest from the current, and ambush food. Healthy rivers also need clean gravel for spawning, good water quality, and connected habitats so fish can move to feed and breed.
Key Terms
- Habitat: The natural place where an animal lives, including the water, plants, and riverbed it depends on.
- Gills: Breathing organs that take oxygen from water as it flows over thin, blood-rich surfaces.
- Spawning: When fish reproduce by releasing eggs and milt (sperm) into the water, often in a specific season and place.
Frequently Asked Questions (Click to see answers)
What fish live in rivers in the UK?
UK rivers can contain species such as trout, salmon, barbel, chub, dace, perch, pike, and eels. Which fish you find depends on the river’s speed, temperature, and water quality.
How do river fish breathe underwater?
River fish breathe using gills. As water passes through the mouth and over the gills, oxygen moves into the blood and carbon dioxide moves out, so the fish can breathe without surfacing.
Why do river fish need clean gravel and plants?
Clean gravel provides gaps where eggs can be protected and supplied with oxygen-rich water. Plants and roots offer shelter, feeding areas, and places for young fish to hide from predators.
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