A series of epizootics caused by Trichodina fultoni is reported. Fish kept in running water at 12°c showed severe signs of trichodiniasis. At 12 °C T. fultoni lacked strict host specificity, but demonstrated some preference.
A redescription of Tripartiella burstjormis, using the silver impregnated techniques, is given. This ciliate is reporred from Acantharchus pomotis. Trichodina nigra is reported from the same host.