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Redalyc.Trichodina Modesta: an Exotic Ciliate in the Neotropical

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Redalyc.Trichodina Modesta: an Exotic Ciliate in the Neotropical Revista Brasileira de Parasitologia Veterinária ISSN: 0103-846X [email protected] Colégio Brasileiro de Parasitologia Veterinária Brasil Moraes Ramos Valladão, Gustavo; Giannecchini, Luiz Gustavo; Laterça Martins, Maurício; Benites de Pádua, Santiago Trichodina modesta: an exotic ciliate in the Neotropical region parasitizing an unusual host Revista Brasileira de Parasitologia Veterinária, vol. 24, núm. 2, abril-junio, 2015, pp. 162- 167 Colégio Brasileiro de Parasitologia Veterinária Jaboticabal, Brasil Available in: http://www.redalyc.org/articulo.oa?id=397841496007 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Original Article Braz. J. Vet. Parasitol., Jaboticabal, v. 24, n. 2, p. 162-167, abr.-jun. 2015 ISSN 0103-846X (Print) / ISSN 1984-2961 (Electronic) Doi: http://dx.doi.org/10.1590/S1984-29612015024 Trichodina modesta: an exotic ciliate in the Neotropical region parasitizing an unusual host Trichodina modesta: exótico ciliado na região Neotropical parasitando hospedeiro não usual Gustavo Moraes Ramos Valladão1; Luiz Gustavo Giannecchini2; Maurício Laterça Martins3*; Santiago Benites de Pádua4 1Laboratório de Patologia de Organismos Aquáticos – LAPOA, Centro de Aquicultura, Universidade Estadual Paulista – CAUNESP, Jaboticabal, SP, Brazil 2Laboratório de Peixes Ornamentais, Centro de Aquicultura, Universidade Estadual Paulista – CAUNESP, Jaboticabal, SP, Brazil 3Laboratório de Sanidade de Organismos Aquáticos – AQUOS, Departamento de Aquicultura, Universidade Federal de Santa Catarina – UFSC, Florianópolis, SC, Brazil 4Aquivet Saúde Aquática, São José do Rio Preto, SP, Brazil Received January 13, 2015 Accepted February 5, 2015 Abstract In this study, an important ornamental fish,Betta splendens (Osphronemidae), from three different Brazilian states was examined for parasitic infestations. Smears with parasites were impregnated with silver nitrate or stained using Giemsa for taxonomic evaluation. A disc-shaped trichodinid with a body diameter of 39.7 ± 3.3 µm, adhesive disc diameter of 32.9 ± 3.1 µm and denticulate ring diameter of 19.5 ± 2.0 µm was found. The morphological characteristics resembled those of Trichodina modesta Lom, 1970, a species that shows clear host specificity for Cypriniformes. Until now, its occurrence was restricted to the Eurasian region. In the present study, a new host for T. modesta is reported and therefore the first occurrence of this species in the Americas. The parasite was possibly introduced into the Neotropical region through the exotic fish trade, especially of Cypriniformes used by aquarists. The distribution of this ciliate is discussed and a checklist of localities and hosts for the species is provided. Keywords: Ornamental fish, Ciliophora, Trichodinidae. Resumo Neste estudo, o peixe ornamental Betta splendens (Osphronemidae) foi examinado a partir de três diferentes Estados brasileiros para infestações parasitárias. Esfregaços contendo parasitos foram impregnados com nitrato de prata ou corados com Giemsa para avaliação taxonômica. Foi observado o tricodinídeo em forma de disco com 39,7 ± 3,3 µm de diâmetro do corpo, disco adesivo com 32,9 ± 3,1 µm e anel denticulado 19,5 ± 2,0 µm de diâmetro. As características morfológicas foram semelhantes à Trichodina modesta Lom, 1970, uma espécie que apresenta especificidade de hospedeiro por peixes Cypriniformes com ocorrência na Região Euro-asiática. No presente estudo, um novo hospedeiro para T. modesta é reportado, assim como a primeira ocorrência da espécie na América. O parasito tem sido possivelmente introduzido na região Neotropical com o comércio de peixes exóticos, principalmente Cypriniformes usados por aquariofilistas. A dispersão do ciliado é discutida e um “checklist” de localidades e hospedeiros apresentado. Palavras-chave: Peixe ornamental, Ciliophora, Trichodinidae. *Corresponding author: Mauricio Laterça Martins. Laboratório de Sanidade de Organismos Aquáticos – AQUOS, Departamento de Aquicultura, Universidade Federal de Santa Catarina – UFSC, Rod. Admar Gonzaga, 1346, CEP 88040-900, Florianópolis, SC, Brasil. e-mail: [email protected] www.cbpv.com.br/rbpv v. 24, n. 2, abr.-jun. 2015 Trichodina modesta in the Neotropical area 163 Introduction This study evaluated the trichodinid fauna ofB. splendens and registers T. modesta in the Americas. The distribution of this Betta splendens (Perciformes: Osphronemidae) is commonly farmed ciliate is discussed and a checklist of hosts and localities for the as an ornamental fish over the world. According to Monvises et al. parasite is presented. (2009), commercialization of Betta spp. was valued at approximately US$ 800,000 in Thailand alone in 2005, and also in July 2013. Materials and Methods Ornamental fish production is of great economic importance worldwide, but there is a lack of scientific information on the diseases of these Study area and fish fish and dissemination of trichodinids in particular. Trichodina nigra Lom, 1961 (THILAKARATNE et al., 2003), Trichodina Adult males of Betta splendens from Muriaé, Minas Gerais acuta Lom, 1961 (PIAZZA et al., 2006), Trichodina reticulata state (21° 7’ 49” S; 42° 22’ 3” W) (n=42), from Ribeirão Preto, Hirschman and Partsch, 1955 (ALBALADEJO & ARTHUR, São Paulo state (21° 10’ 40” S; 47° 48’ 36” W) (n=28) and from 1989; MAHMOUD et al., 2009; MARTINS et al., 2012; HU, Cascavel, Paraná state (24° 57’ 20” S; 53° 27’ 19” W) (n=23) 2012), Trichodina nobilis Chen, 1963 (MARTINS et al., 2012), were examined. The fish had standard lengths of approximately 3.0 cm and only adult males were used in this assay for sampling. Trichodina luzhoues Hu, 2012, and Trichodina mutabilis Kazubski Each fish was kept separately in a two liter aquarium, avoiding and Migala, 1968 (HU, 2012), have been reported in ornamental contamination with others, and fed twice a day with Tetra Color fish. However, onlyTrichodina sp. (THILAKARATNE et al., 2003) Tropical Granules™. Partial water changes of about 50% was and T. acuta (PIAZZA et al., 2006) have been reported from done each day. Water parameters were kept at a pH 6.2 and a Betta splendens. temperature of 27 °C. Trichodina modesta Lom, 1970, was initially described in Hungary, Slovakia and the Czech Republic by Lom (1970), with subsequent reports from Russia (STEIN, 1982; ARTHUR Parasitic diagnosis & LOM, 1984), Taiwan (BASSON & VAN AS, 1994), Poland (WIERZBICKA, 1997; WŁASOW et al., 2003), United Kingdom The body surface and gills of fish were scraped for parasitological (GAZE & WOOTTEN, 1998), Turkey (ÖZER, 2007; ÖZTÜRK analysis and when the parasites were present the smears were & ÖZER, 2007), Germany (RÜCKERT et al., 2007), China impregnated with silver nitrate using Klein’s method (KLEIN, (ZHAO & TANG, 2007; LIU & ZHAO, 2010; HAN & ZHAO, 1958) or stained with Giemsa to observe the nuclear apparatus 2011; TANG et al., 2013) and Bangladesh (KIBRIA et al., 2010). (LOM, 1958). The span was the measurement from the extremity All of these reports were from countries in Europe and Asia. of the blade to the extremity of the ray as described by Arthur & The hosts susceptible to T. modesta include Crossostoma lacustre, Lom (1984). All measurements are in micrometers and followed Misgurnus anguillicaudatus, Rhinogobius brunneus (BASSON & the recommendations of Lom (1958) and Van As & Basson (1989) VAN AS, 1994) and Aphanius danfordii (ÖZER, 2007). All of and analyzed using a Nikon E200 photomicroscope equipped these species are appreciated as ornamental fish, and this also with the Moticam 2300 image capture system. The parasite includes B. splendens. Trichodinid dispersion is facilitated through measurements were made using ImagePro Plus 4.1 software. the ornamental fish trade between countries. Albaladejo & Arthur Minimum and maximum values are provided, followed in (1989) have reported not only occurrences of T. reticulata and parentheses by arithmetic mean, standard deviation and number Trichodina sp. from ornamental fish, but also T. acuta, T. nobilis, of specimens or structures measured. Schematic drawings of the T. nigra, Trichodina heterodentata Duncan, 1977, Tripartiella denticles, as proposed by Van As & Basson (1989), were produced tilapiae Duncan, 1977, and Trichodinella epizootica Raabe, 1950, by means of vectorization using CorelDraw X6 software. from farmed imported cyprinids. Consequently, exportation and importation of ornamental fish represents an important risk factor Results for parasite dispersion worldwide. Trichodinid parasitism may cause lesions on its hosts under farming conditions as a result of rapid trichodinid proliferation. Parasite diagnosis Pathological alterations such as hyperplasia of the secondary lamellae (YEMMEN et al., 2010, 2011), cellular desquamation, lamellar fusion The fish examined showed trichodinid prevalence of 55.9% and (ABDEL-BAKI et al., 2011), subepithelial edema with epithelial Piscinoodinium pillulare Lom, 1981 prevalence of 21.5%, only displacement of the secondary lamellae (VALLADÃO et al., 2014) in the fish from the states of São Paulo and Minas Gerais. No and gill necrosis (YEMMEN et al., 2011; VALLADÃO et al., 2013) parasites were found in the fish from the state of Paraná. are commonly associated with trichodiniasis. These ciliates are frequently associated with lesions on the body surface that lead Trichodinid
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