Tape worms which are transmitted by live vectors. For some the fish are an intermediate host, for others the definitive one.
Many species. Major ones belong to the genera: Eubothrium, Diphyllobothrium, Proteocephalus, & Caryophyllaeus.
Validation: Dissection of heavily parasitised fish will usually show in the intestine & other organs ample evidence of such infections. Often the fish will pass whole worms, which are good indication of a major infestation.
Untreated will cause large mortalities, with treatment it can be brought progressively under control.
Control intermediate hosts, to prevent spread of outbreaks.
Dr. Chacko, Jim
Unity College of Maine
Fish Patholgy Dept.
Dr Prescott, Shawn
Fish Disease Dolau Ltd