The sea lamprey (Petromyzon marinus) is an ancient, jawless fish species found in coastal and freshwater habitats across the UK. Known for its distinctive suction-cup mouth lined with teeth, the sea lamprey is a parasitic species in its adult stage, attaching to host fish to feed on their blood and body fluids. It plays a unique ecological role but is also a species of conservation concern due to habitat loss, pollution, and migration barriers, which have led to population declines in some areas.
