Trichodina magna Van As and Basson, 1989 (Ciliophora: Peritrichia) from cultured Nile tilapia in the state of Santa Catarina, Brazil

Abstract

Specimens of Trichodina magna Van As and Bassson, 1989 (Ciliophora: Peritrichia) from the Nile tilapia Oreochromis niloticus collected from October 2004 to June 2005 in fish ponds situated in three regions of Santa Catarina State, Brazil are described here. Wet smears of skin and gills were prepared in the field, air dried, impregnated with Klein's dry silver method and Giemsa's solution. From a total of 146 examined fish, 36 were parasitized on the skin, 14 in the gills and 33 on the skin and gills, simultaneously. The mean diameter of the body of the specimens of T. magna was 84.3 ± 12.6 µm, adhesive disc 60.7 ± 10.0 µm, denticulate ring, 38.3 ± 7.4 µm, consisting of 26 (23 to 29) denticles. The only distinguishable difference from the original description was the fact that the ray of the denticle is anteriorly directed and does not extend over the y + 1 axis.Keywords: Oreochromis niloticus, Trichodina magna, Brazil. Trichodina magna Van As e Basson, 1989 (Ciliophora: Peritrichia) em tilápia do Nilo cultivada no Estado de Santa Catarina, Brasil ResumoEspécimes de Trichodina magna Van As e Bassson, 1989 (Ciliophora: Peritrichia) em tilápia do Nilo, Oreochromis niloticus coletada em viveiros, entre outubro de 2004 e junho de 2005, em três regiões do Estado de Santa Catarina, Brasil, são descritos. Esfregaços da pele e brânquias foram preparados em campo, secos e impregnados com nitrato de prata pelo método de Klein ou corados com Giemsa. De um total de 146 peixes examinados, 36 estavam parasitados na pele, 14 nas brânquias e 33 na pele e brânquias, simultaneamente. O diâmetro médio do corpo de T. magna foi 84,3 ± 12,6 µm, do disco adesivo 60,7 ± 10,0 µm, do anel denticulado 38,3 ± 7,4 µm consistindo de 26 (23 a 29) dentículos. A única diferença da descrição original é o fato do raio do dentículo ser anteriormente direcionado não ultrapassando o eixo y + 1.Palavras-chave: Oreochromis niloticus, Trichodina magna, Brasil.

First record of Trichodina heterodentata (Ciliophora: Trichodinidae) from channel catfish, Ictalurus punctatus cultivated in Brazil

“…Trichodinids are among one of the most common ectoparasites in wild and cultivated fish Van As, 1994, Martins andGhiraldelli, 2008). This parasite occurs normally in a few numbers on mucous surface and gills.…”

“…This includes Trichodina steini Claparede and Lachmann, 1858 from Bufo ictericus Spix, 1824 (Kattar, 1975), Trichodina acuta Lom, 1961from Xiphophorus maculatus, Gunther, 1866, X. helleri, Heckel, 1848, Betta splendens Regan, 1910 and Carassius auratus Linnaeus, 1758 (Piazza et al, 2006), Trichodina compacta Van As and Basson, 1989 reported by Ghiraldelli et al (2006a) and Trichodina magna Van As and Basson, 1989 by Martins and Ghiraldelli (2008) Pinto et al (2006) and Trichodina heterodentata found on the body and tail of the tadpole Rhinella pombali Baldissera, Caramaschi andHaddad, 2004 (Dias et al, 2009) This study characterises morphologically Trichodina heterodentata Duncan, 1977 in pond-reared channel catfish in the State of Santa Catarina, Southern Brazil. Prevalence, mean intensity of infestation and a list of hosts and comparative measurements were also reported.…”

Can the parasitic fauna on Nile tilapias be affected by different production systems?

“…23080.017229/ 2004-78/UFSC), according to Ghiraldelli et al (2006a) and Martins and Ghiraldelli (2008). Prevalence and mean intensity were calculated by Bush et al (1997).…”

“…In the South Brazil, Ghiraldelli et al (2006a) and Martins and Ghiraldelli (2008) identified trichodinids and Monogenoidea as the most dominant fish-cultured parasites.…”

Trichodina colisae (Ciliophora: Trichodinidae): new parasite records for two freshwater fish species farmed in Brazil

“…So far, only the occurrence of Tripartiella pseudoplatystomae in pintado (Pseudoplatystoma corruscans) (PINTO et al, 2009) and Trichodina heterodentata in pacu (Piaractus mesopotamicus) (PÁDUA et al, 2012) were reported in Brazilian native fishes. Nevertheless, Trichodina compacta and Trichodina magna have been reported in Nile tilapia (GHIRALDELLI et al, 2006;GHIRALDELLI, 2008) and T. heterodentata in channel catfish (MARTINS et al, 2010); they are both exotic species farmed in Brazil.…”