Fish Parasites

Diverse group including anchor worms, fish lice, and flukes affecting ornamental pond fish rather than plants directly.

Varies by species; many have direct life cycles within the pond, reproducing rapidly in warm, poor-quality water.

Do not damage plants but signal a stressed pond ecosystem; heavy infestations can crash fish populations that otherwise help control aquatic pest insects and algae.

Quarantine and treat affected fish with appropriate medication. Improve water quality and filtration.

Quarantine new fish before adding to ponds and maintain good water quality to reduce parasite pressure.