title: First record of Trichodina heterodentata (Ciliophora: Trichodinidae) from channel catfish, Ictalurus punctatus cultivated in Brazil.
abstract: This study characterises morphologically Trichodina heterodentata Duncan, 1977 from channel catfish, Ictalurus punctatus (Rafinesque, 1818) in the State of Santa Catarina, Brazil. Body and gill smears were air-dried at room temperature, impregnated with silver nitrate and/or stained with Giemsa. Ten characteristics were selected to compare the present material with other morphological characterisations of T. heterodentata. Prevalence rate was 100%, mean intensity 89,333.70 (3,125 to 299,100 parasites per host). Trichodina heterodentata was considered medium-sized trichodinid with mean body diameter 59.4 +/- 8.5 microm, denticulate ring 38.5 +/- 4.5 microm, adhesive disc 60.2 +/- 6.7 microm diameter and 24.4 +/- 1.6 denticles. In relation to previous reports of T. heterodentata this material resembles in 90% of the analysed characters. This work confirms the biometrical variation that exists in the different populations of T. heterodentata. A list of hosts and comparative measurements of T. heterodentata are presented and the channel catfish is considered a new host.
authors: Laboratório de Sanidade de Organismos Aquáticos, Departamento de Aquicultura, UFSC, Florianópolis, SC, Brazil. mlaterca@cca.ufsc.br
authors: M L
authors: ML
authors: Martins
authors: N
authors: N
authors: Marchiori
authors: G
authors: G
authors: Nunes
authors: M P
authors: MP
authors: Rodrigues
mesh_terms: D000818:Animals; D001938:Brazil / Q000453:epidemiology; D016770:Ciliophora Infections / Q000453:epidemiology*; D005393:Fish Diseases / Q000453:epidemiology / Q000469:parasitology*; D007059:Ictaluridae / Q000469:parasitology*; D016802:Oligohymenophorea / Q000145:classification* / Q000302:isolation & purification*; D015995:Prevalence