They've been taken to hospital for treatment.
Torbay RNLI has issued a warning after the incident near Shoalstone Pool, Brixham.
They say the swimmer was near the rocks outside the pool when they were attacked, and have been taken to hospital for treatment.
The charity has issued a warning on Facebook not to swim in the area and to stick to the sea pool which is supervised by a lifeguard.
Attempted murder charge after Plymouth assault
Elderly lady attacked
Push for fair education funding heads to Westminster
Devon MPs ramp up efforts
Big shows brings big money for Plymouth
Theatre Royal celebrates record year
Student flats to replace former Exeter nightclub
Six-storey block planned for city centre location
Torbay faces huge savings amid alarm bells over finances
Government urged to go back to the drawing board
