RESUMO
Several fish species are known as host for Digenea trematods. Here, we describe three trematod species as parasites of the Bigeye tuna (Thunnus obesus), which is an important fishing resource for Brazil. We examined 35 specimens of T. obesus obtained from fishermen in Cabo Frio, Rio de Janeiro, southeastern Brazil. We found Brachyphallus parvus and Tetrochetus coryphaenaein the stomach and Lecithochirium microstomumin the intestine of fish. (AU)
Diversas espécies de peixes são conhecidas como hospedeiros detrematódes. Aqui nós registramos três espécies Digenea parasitando Thunnus obesus (Albacora-bandolim), que é um importante recurso pesqueiro para o Brasil. Examinamos 35 espécimes de T. obesus obtidos de pescadores em Cabo Frio, Rio de Janeiro, Brasil. Encontramos Brachyphallus parvus e Tetrochetus coryphaenae parasitando o estômago e Lecithochirium microstomum parasitando o intestino deste hospedeiro. (AU)
Assuntos
Animais , Parasitos/parasitologia , Peixes/parasitologia , Interações Hospedeiro-Parasita , Platelmintos , Perciformes/parasitologia , Atum/parasitologia , ParasitologiaRESUMO
Several fish species are known as host for Digenea trematods. Here, we describe three trematod species as parasites of the Bigeye tuna (Thunnus obesus), which is an important fishing resource for Brazil. We examined 35 specimens of T. obesus obtained from fishermen in Cabo Frio, Rio de Janeiro, southeastern Brazil. We found Brachyphallus parvus and Tetrochetus coryphaenaein the stomach and Lecithochirium microstomumin the intestine of fish.
Diversas espécies de peixes são conhecidas como hospedeiros detrematódes. Aqui nós registramos três espécies Digenea parasitando Thunnus obesus (Albacora-bandolim), que é um importante recurso pesqueiro para o Brasil. Examinamos 35 espécimes de T. obesus obtidos de pescadores em Cabo Frio, Rio de Janeiro, Brasil. Encontramos Brachyphallus parvus e Tetrochetus coryphaenae parasitando o estômago e Lecithochirium microstomum parasitando o intestino deste hospedeiro.
Assuntos
Animais , Atum/parasitologia , Interações Hospedeiro-Parasita , Parasitos/parasitologia , Peixes/parasitologia , Perciformes/parasitologia , Platelmintos , ParasitologiaRESUMO
Pathological alterations and autoecology of Didymocylindrus simplex in Katsuwonus pelamis (Linnaeus, 1758) in the Southwestern Atlantic Ocean off of South America are presented. This is the first record of the species in the region; the specimens are described. The pathologic changes observed most often were infiltration of lymphocytes and slight fibrosis of the connective tissue surrounding the parasite. The typical aggregated distribution pattern was observed for Didymocylindrus simplex Ishii, 1935. Statistical analysis demonstrated no correlation between the abundance and prevalence of parasites with the total length of the host. The sex of the host does not influence the prevalence and intensity of infection.
RESUMO
Pathological alterations and autoecology of Didymocylindrus simplex in Katsuwonus pelamis (Linnaeus, 1758) in the Southwestern Atlantic Ocean off of South America are presented. This is the first record of the species in the region; the specimens are described. The pathologic changes observed most often were infiltration of lymphocytes and slight fibrosis of the connective tissue surrounding the parasite. The typical aggregated distribution pattern was observed for Didymocylindrus simplex Ishii, 1935. Statistical analysis demonstrated no correlation between the abundance and prevalence of parasites with the total length of the host. The sex of the host does not influence the prevalence and intensity of infection.
RESUMO
Pathological alterations and autoecology of Didymocylindrus simplex in Katsuwonus pelamis (Linnaeus, 1758) in the Southwestern Atlantic Ocean off of South America are presented. This is the first record of the species in the region; the specimens are described. The pathologic changes observed most often were infiltration of lymphocytes and slight fibrosis of the connective tissue surrounding the parasite. The typical aggregated distribution pattern was observed for Didymocylindrus simplex Ishii, 1935. Statistical analysis demonstrated no correlation between the abundance and prevalence of parasites with the total length of the host. The sex of the host does not influence the prevalence and intensity of infection.
RESUMO
A new genus and species of didymozoid digenean is described from the skipjack tuna Katsuwonus pelamis (Linnaeus) in the Southwest Atlantic Ocean off Brazil. Pozdnyakovia gibsoni n. g., n. sp. is placed in the Gonapodasmiinae Ishii, 1935. The new genus differs from other genera in the morphology of the posterior regions of the fused pair; this consists of an unlobed, rounded mass fused only dorsally and with a large, elliptical ventral aperture opening into a longitudinal deep cavity from which emerge the two elongate anterior regions. It also differs in the form of the testes, which form two sets of three to four branches in each partner.
Assuntos
Doenças dos Peixes/parasitologia , Trematódeos/anatomia & histologia , Trematódeos/classificação , Infecções por Trematódeos/veterinária , Atum/parasitologia , Animais , Brasil , Especificidade da Espécie , Infecções por Trematódeos/parasitologiaRESUMO
Durante expedições no rio Paraná, Paraná, Brasil, diferentes grupos de helmintos foram coletados em peixes provenientes do reservatório da Usina Hidrelétrica de Itaipú Binaciona. Dentre estes helmintos duas espécies de acanthocephala foram registradas parasitando novos hospedeiros. Gorytocephalus elongorchis Thatcher, 1979 foi encontrado parasitando os novos hospedeiros Hypostomus cochliodon Kner, 1854, Hypostomus regani Ihering, 1905 e Loricaria sp. e Neoechinorhynchus (Neoechinorhynchus) pimelodi Brasil-Sato & Pavanelli, 1998 em Pimelodus maculatus Lacèpéde, 1803 (hospedeiro tipo) e nos novos hospedeiros Bergiaria westermanni (Lütken, 1874), Schizodon knerii (Steindachner, 1875) e Brycon orbignyanus (Valenciennes, 1850).
RESUMO
Durante expedições no rio Paraná, Paraná, Brasil, diferentes grupos de helmintos foram coletados em peixes provenientes do reservatório da Usina Hidrelétrica de Itaipú Binaciona. Dentre estes helmintos duas espécies de acanthocephala foram registradas parasitando novos hospedeiros. Gorytocephalus elongorchis Thatcher, 1979 foi encontrado parasitando os novos hospedeiros Hypostomus cochliodon Kner, 1854, Hypostomus regani Ihering, 1905 e Loricaria sp. e Neoechinorhynchus (Neoechinorhynchus) pimelodi Brasil-Sato & Pavanelli, 1998 em Pimelodus maculatus Lacèpéde, 1803 (hospedeiro tipo) e nos novos hospedeiros Bergiaria westermanni (Lütken, 1874), Schizodon knerii (Steindachner, 1875) e Brycon orbignyanus (Valenciennes, 1850).
RESUMO
The nematode Philometra katsuwoni Petter & Baudin-Laurencin, 1986, a gonad-infecting parasite of Katsuwonus pelamis (Linneaus 1758), originally described from the Gulf of Guinea, is reported for the first time from the coastal zone of Rio de Janeiro State, Brazil. As compared with the original description, the males of the Brazilian material are generally somewhat larger and their right spicule and the gubernaculum are longer. The subgravid female is described for the first time. It is characterized by the anterior inflation of the esophagus and by the presence of two distinct caudal lobes.
Philometra katsuwoni Petter & Baudin-Laurencin 1986, nematóide parasito do ovário de Katsuwonus pelamis (Linneaus 1758), originalmente descrito no Golfo da Guiné, é referido pela primeira vez na zona costeira do Estado do Rio de Janeiro, Brasil. Comparados com a descrição original, os machos do material brasileiro são um pouco maiores e possuem o espículo direito e o gubernáculo mais longos. A fêmea subgrávida é descrita pela primeira vez. Ela se caracteriza pela região anterior do esôfago inflada e pela presença de dois lobos caudais distintos.
Assuntos
Ecossistema , Peixes , Interações Hospedeiro-Parasita , Helmintos/parasitologia , Fauna Marinha , Nematoides/parasitologia , Parasitos/parasitologiaRESUMO
The study of different species of tunas has revealed high numbers of cysts of Koellikerioides internogastricus Yamaguti, 1970, parasitizing Thunnus atlanticus (Lesson), Thunnus albacares (Bonnaterre) and Thunnus obesus (Lowe), caught along the Rio de Janeiro coastline, Atlantic Ocean, Brazil. This parasite was isolated from mucosa and submucosa of the stomach of the three tuna species studied. We report K. internogastricus for the first time on the Brazilian coast, representing the first record of this species in South America and in T. atlanticus, a new host. The pathological alterations induced by K. internogastricus in the stomach of T. albacares, T. atlanticus and T. obesus are also described for the first time. Original measurements and figures are presented.
Assuntos
Doenças dos Peixes/parasitologia , Trematódeos/anatomia & histologia , Infecções por Trematódeos/veterinária , Atum/parasitologia , Animais , Brasil/epidemiologia , Doenças dos Peixes/epidemiologia , Trematódeos/classificação , Infecções por Trematódeos/epidemiologia , Infecções por Trematódeos/parasitologiaRESUMO
Eight known species of Demidospermus (Dactylogyridae, Monogenea) were collected from siluriform fishes from reservoir of the Itaipu Hydroelectric Power Station, Paraná, Brazil. Four of them are recorded for the first time in Brazil, enlarging their geographical distribution: Demidospermus armostus, Demidospermus anus, Demidospermus bidiverticulatum and Demidospermus valenciennesi. Demidospermus labrosi is synonymized with Demidospermus cornicinus and Demidospermus mandi with Demidospermus leptosynophallus and reported from two new hosts. Demidospermus paravalenciennesi and Demidospermus uncusvalidus were also collected.
Oito espécies de Demidospermus (Dactylogyridae, Monogenea) foram coletadas de peixes Siluriformes do reservatório da Usina Hidrelétrica de Itaipú, Paraná, Brasil. Quatro dessas são registradas pela primeira vez no Brasil, aumentando sua distribuição geográfica: Demidospermus armostus, Demidospermus anus, Demidospermus bidiverticulatum e Demidospermus valenciennesi. Demidospermus labrosi é considerada sinônima de Demidospermus cornicinus e Demidospermus mandi sinônima de Demidospermus leptosynophallus e registradas em dois novos hospedeiros. Foram também coletados exemplates de Demidospermus paravalenciennesi e Demidospermus uncusvalidus.
Assuntos
Animais , Peixes-Gato/parasitologia , Infecções por Cestoides/veterinária , Doenças dos Peixes/parasitologia , Platelmintos/isolamento & purificação , Brasil , Centrais Elétricas , Platelmintos/anatomia & histologiaRESUMO
Two species of Didymozoidae, Didymosulcus palati (Yamaguti 1970) and Didymosulcus philobranchiarca (Yamaguti 1970) were reported for the first time in South America, Atlantic Ocean, parasitizing three different tuna species from the coast of Rio de Janeiro, Brazil: Thunnus atlanticus (Lesson), Thunnus albacares (Bonnaterre) and Thunnus obesus (Lowe). Pairs of D. philobranchiarca were found on gill arches of T. albacares and T. obesus, in longitudinal rows of yellow cysts located inside grooves in the hard denticle palate (new site) of the three hosts species studied, and as disperse groups of cysts in the operculum (new site) and gill arches of T. atlanticus (new host record). D. palati occurred as disperse groups of encysted worm pairs in the gill arches of T. albacares and T. obesus and in gill arches and operculum of T. atlanticus (new host record). The pathological alterations induced by D. philobranchiarca in the palate of T. atlanticus are described for the first time. Original measurements and figures are presented.
Assuntos
Doenças dos Peixes/epidemiologia , Trematódeos/isolamento & purificação , Infecções por Trematódeos/veterinária , Atum/parasitologia , Animais , Oceano Atlântico , Brasil/epidemiologia , Doenças dos Peixes/diagnóstico , Doenças dos Peixes/parasitologia , Prevalência , Trematódeos/classificação , Infecções por Trematódeos/diagnóstico , Infecções por Trematódeos/epidemiologia , Atum/classificaçãoRESUMO
Two species of Didymozoidae, Didymosulcus palati (Yamaguti 1970) and Didymosulcus philobranchiarca (Yamaguti 1970) were reported for the first time in South America, Atlantic Ocean, parasitizing three different tuna species from the coast of Rio de Janeiro, Brazil: Thunnus atlanticus (Lesson), Thunnus albacares (Bonnaterre) and Thunnus obesus (Lowe). Pairs of D. philobranchiarca were found on gill arches of T. albacares and T. obesus, in longitudinal rows of yellow cysts located inside grooves in the hard denticle palate (new site) of the three hosts species studied, and as disperse groups of cysts in the operculum (new site) and gill arches of T. atlanticus (new host record). D. palati occurred as disperse groups of encysted worm pairs in the gill arches of T. albacares and T. obesus and in gill arches and operculum of T. atlanticus (new host record). The pathological alterations induced by D. philobranchiarca in the palate of T. atlanticus are described for the first time. Original measurements and figures are presented.
Assuntos
Animais , Doenças dos Peixes/epidemiologia , Trematódeos/isolamento & purificação , Infecções por Trematódeos/veterinária , Atum/parasitologia , Oceano Atlântico , Brasil/epidemiologia , Doenças dos Peixes/diagnóstico , Doenças dos Peixes/parasitologia , Prevalência , Trematódeos/classificação , Infecções por Trematódeos/diagnóstico , Infecções por Trematódeos/epidemiologia , Atum/classificaçãoRESUMO
Eight known species of Demidospermus (Dactylogyridae, Monogenea) were collected from siluriform fishes from reservoir of the Itaipu Hydroelectric Power Station, Paraná, Brazil. Four of them are recorded for the first time in Brazil, enlarging their geographical distribution: Demidospermus armostus, Demidospermus anus, Demidospermus bidiverticulatum and Demidospermus valenciennesi. Demidospermus labrosi is synonymized with Demidospermus cornicinus and Demidospermus mandi with Demidospermus leptosynophallus and reported from two new hosts. Demidospermus paravalenciennesi and Demidospermus uncusvalidus were also collected.
Assuntos
Peixes-Gato/parasitologia , Infecções por Cestoides/veterinária , Doenças dos Peixes/parasitologia , Platelmintos/isolamento & purificação , Animais , Brasil , Platelmintos/anatomia & histologia , Centrais ElétricasRESUMO
Eight known species of Demidospermus (Dactylogyridae, Monogenea) were collected from siluriform fishes from reservoir of the Itaipu Hydroelectric Power Station, Paraná, Brazil. Four of them are recorded for the first time in Brazil, enlarging their geographical distribution: Demidospermus armostus, Demidospermus anus, Demidospermus bidiverticulatum and Demidospermus valenciennesi. Demidospermus labrosi is synonymized with Demidospermus cornicinus and Demidospermus mandi with Demidospermus leptosynophallus and reported from two new hosts. Demidospermus paravalenciennesi and Demidospermus uncusvalidus were also collected.
Oito espécies de Demidospermus (Dactylogyridae, Monogenea) foram coletadas de peixes Siluriformes do reservatório da Usina Hidrelétrica de Itaipú, Paraná, Brasil. Quatro dessas são registradas pela primeira vez no Brasil, aumentando sua distribuição geográfica: Demidospermus armostus, Demidospermus anus, Demidospermus bidiverticulatum e Demidospermus valenciennesi. Demidospermus labrosi é considerada sinônima de Demidospermus cornicinus e Demidospermus mandi sinônima de Demidospermus leptosynophallus e registradas em dois novos hospedeiros. Foram também coletados exemplates de Demidospermus paravalenciennesi e Demidospermus uncusvalidus.
RESUMO
Nematodes (1 male and numerous females) of the Philometridae were collected from the mesentery of 2 species of pimelodid catfishes, Calophysus macropterus and Perrunichthys perruno, from the Amazon River basin (fishmarket in Iquitos, Loreto District) in Peru. A detailed study of their morphology (including scanning electron microscopy) and a reexamination of the type and voucher specimens of Philometra amazonica Travassos, 1960, from Brazilian catfishes confirmed that they belong to this species and that Philometra (Alinema) alii Rasheed, 1963 is its junior synonym. Because of some marked morphological peculiarities of this species (presence of minute peribuccal sclerotized formations, a functional vagina and vulva in gravid female, and structure of the male tail), the validity of an independent genus, Alinema Rasheed, 1963, is confirmed, to which this species is transferred as Alinema amazonicum (Travassos, 1960) n. comb. This is the first record of this parasite from Peru, and P. perruno represents its new host record.
Assuntos
Peixes-Gato/parasitologia , Dracunculoidea/classificação , Dracunculoidea/ultraestrutura , Doenças dos Peixes/parasitologia , Infecções por Spirurida/veterinária , Animais , Feminino , Masculino , Microscopia Eletrônica de Varredura/veterinária , Peru , Infecções por Spirurida/parasitologiaRESUMO
Mymarothecium boegeri sp. n. (Monogenea: Dactylogyridae) is described from the gills of Colossoma macropomum Cuvier (Characidae), collected from the aquaria of the "Centro de Pesquisas em Aquicultura, Departamento Nacional de Obras Contra as Secas (DNOCS)", Pentecoste City, State of Ceará, Brazil. Mymarothecium viatorum Boeger, Piasecki et Sobecka, 2002 is reported from the type host, Piaractus brachypomus (Cuvier) (Characidae) and from a new host, P. mesopotamicus (Holmberg) (Characidae), confirming the occurrence of M. viatorum in the Neotropical Region. The new species differs from the congeneric species in the structure of male copulatory complex; it is more closely related to M. viatorum by the presence of a posteromedial projection on ventral bar.
Assuntos
Doenças dos Peixes/parasitologia , Platelmintos/classificação , Platelmintos/isolamento & purificação , Infecções por Trematódeos/veterinária , Animais , Tamanho Corporal , Brasil , Peixes , Água Doce , Brânquias/parasitologia , Platelmintos/anatomia & histologia , Infecções por Trematódeos/parasitologiaRESUMO
Didymoproblema fusiforme Ishii, 1935 and Neodiplotrema pelamydis (Yamaguti, 1938) from the gills and Coeliodidymocystis kamegaii Yamaguti,1970 from pyloric caeca of Katsuwonus pelamis (Linnaus, 1758) and Didymocystis orbitalis Yamaguti, 1970, from periorbital connective and adipose tissues of Thunnus obesus (Lowe, 1839) are studied. D. fusiforme, N. pelamydis and D. orbitalis are reported for the first time in South America and C. kamegaii in Brazil; these four species already described from Pacific are now referred in Atlantic Ocean. Brief descriptionwith original measurements are presented.
RESUMO
Didymoproblema fusiforme Ishii, 1935 and Neodiplotrema pelamydis (Yamaguti, 1938) from the gills and Coeliodidymocystis kamegaii Yamaguti,1970 from pyloric caeca of Katsuwonus pelamis (Linnaus, 1758) and Didymocystis orbitalis Yamaguti, 1970, from periorbital connective and adipose tissues of Thunnus obesus (Lowe, 1839) are studied. D. fusiforme, N. pelamydis and D. orbitalis are reported for the first time in South America and C. kamegaii in Brazil; these four species already described from Pacific are now referred in Atlantic Ocean. Brief descriptionwith original measurements are presented.
RESUMO
Foi realizada uma avaliação da helmintofauna dos peixes do Departamento Nacional de Obras Contra as Secas, DNOCS,Pentecoste, Ceará, Brasil. Foram examinados 568 peixes pertencentes a 27 diferentes espécies em abril de 1996, agosto de1998, novembro de 2000 e abril de 2002, coletados no Açude Pereira de Miranda e nos vivieiros do Centro de PesquisasRodolfo Von Ihering. Do total de peixes examinados, 164 (28,87%) encontravam-se parasitados por helmintos, incluindoMonogenea, Cestoda, Digenea e Nematoda, isolados ou em associações. Monogenea apresentou o mais alto índice deprevalência de parasitismo (20,7 % ).