Signs of fish lice

Visible lice: Fish lice are often visible to the naked eye, appearing as small, flat, oval-shaped parasites.

Lethargy: Infected fish may appear lethargic and less active.

Skin lesions: Fish may develop red or white spots on their skin.

Increased mucus production: Fish may produce excessive mucus as a response to the irritation caused by the lice.

Frayed fins: Fish may have frayed or damaged fins.