Fish Louse

Natural Habitat

Freshwater and marine environments, typically found on the skin, fins, and gills of fish.

Diet & Feeding

Ectoparasitic, feeding on the mucus, blood, and epidermal tissues of fish.

Behavior Patterns

They cling to their host using suckers and piercing mouthparts. They can swim freely in water to find new hosts. Reproduction involves attaching eggs to submerged objects.

Risks & Benefits

Potential risks to fish as they can cause irritation, secondary infections, and stress, which can lead to reduced growth and even mortality in severe infestations, especially in aquaculture. No known direct risks or benefits to humans, but their impact on fish health can affect fisheries.

Identified on: 10/22/2025