Significance to humans

In the wild, the number of monogeneans living on an individual host is generally low, and infestations of these parasites do not usually cause disease. In crowded fish farms, however, parasite populations often increase uncontrollably and the hosts may be damaged or killed.

1. Tetraonchus monenteron, 2. Entobdella soleae, S. Gyrodactylus pungitii, 4. Dactylogyrus vastator. (Illustration by Barbara Duperron)

1. Gastrocotyle trachuri; 2. Polystoma integerrimum; 3. Pseudodiplorchis americanus; 4. Diclidophora merlangi. (Illustration by Barbara Duperron) Grzimek's Animal Life Encyclopedia 217

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