NUEVOS DATOS SOBRE TRES ESPECIES DE KOELLIKERIOIDES (DIGENEA, DIDYMOZOIDAE) EN ATÚN DE BRASIL

Four species of scombrid fishes (Perciformes) from the coastal zone of Rio de Janeiro, Brazil, wereexamined for helminth parasites. These are Thunnus albacares (Bonnaterre, 1788), Thunnus atlanticus(Lesson, 1831), Thunnus obesus (Lowe, 1839) and Euthynnus alletteratus (Rafinesque, 1810). Threespecies of the genus Koellikerioides Yamaguti, 1970: K. apicalis Yamaguti, 1970, K. externogastricusYamaguti, 1970 and K. intestinalis Yamaguti, 1970, were recorded from the gill raker, the outer musclelayer of the stomach wall and the inner surface of the small intestine, respectively. Originalmeasurements, parameters of infection and original figures are presented. K. apicalis and K. intestinalisshowed the typical aggregated distribution pattern. Statistical analysis showed that there was asignificant negative correlation between the total lengths of E. alletteratus and the prevalence of K.intestinalis. The findings of K. apicalis in T. atlanticus and of K. intestinalis in T. atlanticus and E.alletteratus represent new host records. All species are reported for the first time in the SouthwestAtlantic Ocean.Cuatro especies de peces escómbridos (Perciformes) de la zona costera de Río de Janeiro, Brasil, fueron examinados para estudiar sus helmintos parásitos: Thunnus albacares (Bonnaterre, 1788), Thunnus atlanticus (Lesson, 1831), Thunnus obesus (Lowe, 1839) y Euthynnus alletteratus (Rafinesque, 1810). Tres especies del género Koellikerioides Yamaguti, 1970: K. apicalis Yamaguti, 1970, K. externogastricus Yamaguti, 1970 y K. intestinalis Yamaguti, 1970, se registraron en las branquiespinas, en la capa muscular externa de la pared del estómago y en la superficie interna del intestino delgado, respectivamente. Se presentan las medidas originales, los parámetros de la infeccióny las ilustraciones originales. K. apicalis y K. intestinalis mostraron el patrón típico de distribución agregada. El análisis estadístico mostro que había una correlación negativa significativa entre la longitud total de E. alletteratus y la prevalencia de K. intestinalis. Los resultados de K. apicalis en T. atlanticus y de K. intestinalis en T. atlanticus y E. alletteratus representan nuevos registros de hospedadores. Todas las especies se reportan por primera vez en el Océano Atlántico Sudoccidental

New data on three species of Koellikerioides (Digenea, Didymozoidae) in brazilian tuna fish

Four species of scombrid fishes (Perciformes) from the coastal zone of Rio de Janeiro, Brazil, were examined for helminth parasites. These are Thunnus albacares (Bonnaterre, 1788), Thunnus atlanticus (Lesson, 1831), Thunnus obesus (Lowe, 1839) and Euthynnus alletteratus (Rafinesque, 1810). Three species of the genus Koellikerioides Yamaguti, 1970: K. apicalis Yamaguti, 1970, K. externogastricus Yamaguti, 1970 and K. intestinalis Yamaguti, 1970, were recorded from the gill raker, the outer muscle layer of the stomach wall and the inner surface of the small intestine, respectively. Original measurements, parameters of infection and original figures are presented. K. apicalis and K. intestinalis showed the typical aggregated distribution pattern. Statistical analysis showed that there was a significant negative correlation between the total lengths of E. alletteratus and the prevalence of K. intestinalis. The findings of K. apicalis in T. atlanticus and of K. intestinalis in T. atlanticus and E. alletteratus represent new host records. All species are reported for the first time in the Southwest Atlantic Ocean.Cuatro especies de peces escómbridos (Perciformes) de la zona costera de Río de Janeiro, Brasil, fueron examinados para estudiar sus helmintos parásitos: Thunnus albacares (Bonnaterre, 1788), Thunnus atlanticus (Lesson, 1831), Thunnus obesus (Lowe, 1839) y Euthynnus alletteratus (Rafinesque, 1810). Tres especies del género Koellikerioides Yamaguti, 1970: K. apicalis Yamaguti, 1970, K. externogastricus Yamaguti, 1970 y K. intestinalis Yamaguti, 1970, se registraron en las branquiespinas, en la capa muscular externa de la pared del estómago y en la superficie interna del intestino delgado, respectivamente. Se presentan las medidas originales, los parámetros de la infeccióny las ilustraciones originales. K. apicalis y K. intestinalis mostraron el patrón típico de distribución agregada. El análisis estadístico mostro que había una correlación negativa significativa entre la longitud total de E. alletteratus y la prevalencia de K. intestinalis. Los resultados de K. apicalis en T. atlanticus y de K. intestinalis en T. atlanticus y E. alletteratus representan nuevos registros de hospedadores. Todas las especies se reportan por primera vez en el Océano Atlántico Sudoccidental

Notes on helminth parasites of tuna fishes (Scombridae) in Brazil Notas sobre los helmintos parásitos del atún (Scombridae) en Brasil

Four species of Scombridae from the coast of Rio de Janeiro, southwest Atlantic Ocean were found to be parasitized with species of Didymozoidae (Digenea): Thunnus atlanticus (Lesson) a new host record for Nephrodidymotrema ahi Yamaguti, 1970, Didymocystis neothunni (Yamaguti, 1970), and Didymozoon longicolle (Yamaguti, 1970); Thunnus obesus (Lowe) parasitized by Didymozoon longicolle and reported as a new host for Nephrodidymotrema ahi; Thunnus albacares (Bonaterre) parasitized by Nephrodidymotrema ahi, and Katsuwonus pelamis (Linnaeus) by Didymozoon longicolle. Measurements, figures, and parameters of infection are presented.<br>Cuatro especies de Scombridae de la costa de Río de Janeiro, suroeste del océano Atlántico, se reportan parasitados con diferentes especies de Didymozoidae (Digenea): Thunnus atlanticus (Lesson) un registro de nuevo huésped para Nephrodidymotrema ahi Yamaguti, 1970, Didymocystis neothunni (Yamaguti, 1970) y para Didymozoon longicolle (Yamaguti, 1970); Thunnus obesus (Lowe) parasitado por Didymozoon longicolle, se indica como nuevo huésped para Nephrodidymotrema ahi; Thunnus albacares (Bonaterre) parasitados por Nephrodidymotrema ahi y Katsuwonus pelamis (Linnaeus) por Didymozoon longicolle. Se presentan las mediciones, las figuras y los parámetros de la infección

Didymozoidae (Digenea) parasites of Scombridae (Actinopterygii) from Rio de Janeiro coast, Brazil

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

First record in South America of Didymosulcus palati and Didymosulcus philobranchiarca (Digenea, Didymozoidae) with new hosts records and pathological alterations

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

Diversity of Nematoda and Digenea from different species of characiform fishes from Tocantins River, Maranhão, Brazil

Abstract During a survey of the helminth fauna of characiform fishes from the Tocantins River, Brazil, 185 fish specimens from 22 species were studied. Twelve species of Nematoda and nine species of Digenea were collected. Some of these helminth species were reported for the first time in their hosts, thus representing new host records: Procamallanus (Spirocamallanus) sp. in Bivibranchia notata, Brycon pesu, Chalceus macrolepidotus, Hemiodus microlepis and Hemiodus unimaculatus; Procamallanus (Spirocamallanus) inopinatus in Triportheus elongatus; Goezia sp. (larva) in Boulengerella cuvieri; Rhabdochona acuminata in Brycon pesu and Triportheus trifurcatus; Raphidascaris sp. (larva) in Caenotropus labyrinthicus; Cosmoxynema vianai in Cyphocharax gouldingi; Rondonia rondoni in Leporinus fasciatus and Mylesinus paucisquamatus; Klossinemella iheringi in Mylesinus paucisquamatus; Cucullanidae gen. sp. in Myloplus rubripinnis; Rhabdochona sp. in Triportheus elongatus; Alphamphistoma sp. in Myleus setiger; Chalcinotrema sp. in Cyphocharax gouldingi; Pacudistoma guianense in Hemiodus unimaculatus and Myleus torquatus; Pseudocladorchis cylindricus in Hemiodus unimaculatus; Dadaytrema oxycephala in Mylesinus paucisquamatus; Travassosinia dilatata in Myloplus asterias; and Genarchella genarchella in Raphiodon vulpinus. Studies identifying new hosts and new localities for parasites have contributed to the knowledge of local biodiversity. A list of previous records of helminths included in the present study, providing hosts, localities, and references, is presented here

Seasonality of parasitic helminths of Leporinus macrocephalus and their parasitism rates in farming systems in the Amazon

<div><p>Abstract The objective of the present study was to analyze the seasonality of parasitic helminths of Leporinus macrocephalus from fish farms in the municipality of Cruzeiro do Sul, Acre, Brazil, and their parasitism rates. Between June 2014 and March 2015, 200 specimens were sampled from two fish farms: one with a semi-intensive system and the other with an extensive system (100 fish from each farm: 50 during the dry season and 50 during the rainy season). Fifteen species of parasites were found, with seasonal variations of some according to the farming system. In the semi-intensive fish farm, there was greater prevalence of infection during the dry season. Also, Urocleidoides paradoxus, Procamallanus (Spirocamallanus) inopinatus, Goezia leporini and Rhabdochona (Rhabdochona) acuminata presented differences in their parasitism rates between the seasons. In the extensive fish farm, no variation in the prevalence of infection was observed between the seasons and two species Tereancistrum parvus and G. leporini demonstrated differences only regarding the mean intensity of infection. The data presented here may help fish farmers to understand the parasite dynamics of L. macrocephalus in farming systems during the dry and rainy seasons in the state of Acre.</p></div