Fish taeniasis is a parasitic disease of mermaids. Once people eat uncooked or raw "sick fish", the sparganium parasitic in fish will develop into adults in human body, causing human fish taeniasis, which will not spread from human hands. If cooked completely, it can kill sparganium without causing infection.

After suffering from this tapeworm disease, the gastrointestinal symptoms are not obvious, generally only fatigue, diarrhea or constipation, numbness of limbs, hunger, halophilia and other discomfort. In severe cases, anemia or severe anemia may occur, and even the ability to work may be lost.

The most fundamental measure to prevent fish taeniasis is not to eat raw or undercooked freshwater fish.