Digenean trematodes of Seriolella porosa (Pisces, Centrolophidae) in San Matías Gulf, Argentina

Seriolella porosa (Silver warehou) is an important fish resource in the Argentine Sea. No previous studies have been carried out to date on its parasite fauna. The present study aims to (i) identify the digenean trematodes that parasitize Silver warehou, (ii) estimate parasite frequency and abundance, and (iii) establish their relationship with fish size and sex. A total of 100 specimens of S. porosa from San Matías Gulf, Argentina were examined between September and October 2006. Host size and sex were determined. Parasites extracted from the stomach lumen were fixed, conserved in 5% formalin, and stained with Langeron's hydrochloric carmine. The following parameters were also determined: dispersion coefficient, prevalence, intensity, and parasite abundance. Differences in parasitism were assessed using non-parametric tests. Four adult digenean species were found in the stomach, namely Lecithocladium cristatum, Aponurus laguncula, Elytrophalloides oatesi and Gonocerca cf. phycidis. L. cristatum was not only dominant but also the most prevalent and abundant species. None of the digeneans showed interspecific association with each other and therefore they might follow different patterns of colonization (i. e., different intermediate hosts, seasonal and/or spatial distribution of the infective stages). Significant differences were observed among the digeneans analyzed in respect to the sex of the host. Results from this study show that Silver warehou plays a key role as a final host of a significant number of digeneans in the ecosystem. This study is the first step in an attempt to further determine the larval stages in intermediate hosts in San Matías Gulf.Centro de Estudios Parasitológicos y de Vectore

Digenean trematodes of Seriolella porosa (Pisces, Centrolophidae) in San Matías Gulf, Argentina

Seriolella porosa (Silver warehou) is an important fish resource in the Argentine Sea. No previous studies have been carried out to date on its parasite fauna. The present study aims to (i) identify the digenean trematodes that parasitize Silver warehou, (ii) estimate parasite frequency and abundance, and (iii) establish their relationship with fish size and sex. A total of 100 specimens of S. porosa from San Matías Gulf, Argentina were examined between September and October 2006. Host size and sex were determined. Parasites extracted from the stomach lumen were fixed, conserved in 5% formalin, and stained with Langeron's hydrochloric carmine. The following parameters were also determined: dispersion coefficient, prevalence, intensity, and parasite abundance. Differences in parasitism were assessed using non-parametric tests. Four adult digenean species were found in the stomach, namely Lecithocladium cristatum, Aponurus laguncula, Elytrophalloides oatesi and Gonocerca cf. phycidis. L. cristatum was not only dominant but also the most prevalent and abundant species. None of the digeneans showed interspecific association with each other and therefore they might follow different patterns of colonization (i. e., different intermediate hosts, seasonal and/or spatial distribution of the infective stages). Significant differences were observed among the digeneans analyzed in respect to the sex of the host. Results from this study show that Silver warehou plays a key role as a final host of a significant number of digeneans in the ecosystem. This study is the first step in an attempt to further determine the larval stages in intermediate hosts in San Matías Gulf.Centro de Estudios Parasitológicos y de Vectore

Digenean trematodes of Seriolella porosa (Pisces, Centrolophidae) in San Matías Gulf, Argentina

Seriolella porosa (Silver warehou) is an important fish resource in the Argentine Sea. No previous studies have been carried out to date on its parasite fauna. The present study aims to (i) identify the digenean trematodes that parasitize Silver warehou, (ii) estimate parasite frequency and abundance, and (iii) establish their relationship with fish size and sex. A total of 100 specimens of S. porosa from San Matías Gulf, Argentina were examined between September and October 2006. Host size and sex were determined. Parasites extracted from the stomach lumen were fixed, conserved in 5% formalin, and stained with Langeron's hydrochloric carmine. The following parameters were also determined: dispersion coefficient, prevalence, intensity, and parasite abundance. Differences in parasitism were assessed using non-parametric tests. Four adult digenean species were found in the stomach, namely Lecithocladium cristatum, Aponurus laguncula, Elytrophalloides oatesi and Gonocerca cf. phycidis. L. cristatum was not only dominant but also the most prevalent and abundant species. None of the digeneans showed interspecific association with each other and therefore they might follow different patterns of colonization (i. e., different intermediate hosts, seasonal and/or spatial distribution of the infective stages). Significant differences were observed among the digeneans analyzed in respect to the sex of the host. Results from this study show that Silver warehou plays a key role as a final host of a significant number of digeneans in the ecosystem. This study is the first step in an attempt to further determine the larval stages in intermediate hosts in San Matías Gulf.Centro de Estudios Parasitológicos y de Vectore

PREVALENCIA, INTENSIDAD YASPECTOS ECOLOGICOS DE CONTRACAECUM SP. (NEMATODE: ANISAKIDAE) EN PECES DE AGUA DULCE DE ARGENTINA

The genus Contracaecum belongs to the Anisakidae family which includes parasites of considerable economic and medical importance. Larvae of Contracaecum are associated with a wide variety of freshwater and marine fish. Although there are a significant number of reports that indicate the presence of anisakid in fish from different parts of the world, there are few studies in the central region of Argentina, despite the prevalence observed in recent years. In the present study we provide new records and analyze ecological aspects of anisakid from fish of different aquatic systems with different hydrological characteristics from central Argentina.Atotal of 1402 individuals belonging to nine species, six families and four orders of fish were examinated for nematode parasites. The helminths were found in Astyanax eigenmanniorum (Characidae), Oligosarcus jenynsii (Characidae), Odontesthes bonariensis (Atherinopsidae), Hoplias malabaricus (Erythrinidae), Pimelodus albicans (Pimelodidae) and Rhamdia quelen (Pimelodidae). The last three host species showed up to 100% prevalence and maximum intensities of 162, 180 and 48 larvae/fish, respectively. All parasites found coincide with larvae of Contracaecum sp. type 2.El género Contracaecum pertenece a la familia Anisakidae, la cual incluye parásitos de considerable importancia económica y médica. Las larvas de Contracaecum están asociadas con una amplia variedad de peces marinos y de agua dulce. Si bien, hay una gran cantidad de reportes que indican la presencia de anisákidos en peces de diferentes partes del mundo, los estudios en la región central de Argentina son escasos, pese a las prevalencias observadas en años recientes. Este estudio proporciona nuevos registros y analiza aspectos ecológicos de larvas de Contracaecum presentes en peces de ambientes acuáticos con diferentes características hidrológicas ubicados en el centro de Argentina. Se examinó un total de 1402 peces pertenecientes a nueve especies, seis familias y cuatro órdenes. Los helmintos fueron hallados en Astyanax eigenmanniorum (Characidae), Oligosarcus jenynsii (Characidae), Odontesthes bonariensis (Atherinopsidae), Hoplias malabaricus (Erythrinidae), Pimelodus albicans (Pimelodidae) y Rhamdia quelen (Pimelodidae). Estas últimas tres especies hospedadoras exhibieron prevalencias de hasta 100% e intensidades máximas de 162, 180 y 48 larvas/pez, respectivamente. La totalidad de los parásitos hallados se corresponden con larvas de tercer estadio de Contracaecum sp., compatibles con el tipo 2

Reseña del XIII Congreso Internacional de Manejo de Fauna Silvestre en la Amazonia y Latinoamérica (XIII CIMFAUNA)

El XIII Congreso Internacional de Manejo de Fauna Silvestre en la Amazonia y Latinoamérica (XIII CIMFAUNA) tuvo lugar entre el 7 y el 11 de mayo de 2018 en el Hotel Grand Nobile de Ciudad del Este, República del Paraguay. Estos eventos interdisciplinarios son organizados desde 1992 en distintas sedes por la Comunidad de Manejo de Fauna Silvestre en América Latina (COMFAUNA), reconociendo desde sus principios la importancia de las comunidades indígenas y rurales en el manejo comunitario y el co-manejo para asegurar el uso sostenible y la conservación de la fauna silvestre.Asociación Parasitológica Argentin

Prevalence, intensity and ecological aspects of Contracaecum sp. (Nematode: anisakidae) in freshwater fish of Argentina.

The genus Contracaecum belongs to the Anisakidae family which includes parasites of considerable economic and medical importance. Larvae of Contracaecum are associated with a wide variety of freshwater and marine fish. Although there are a significant number of reports that indicate the presence of anisakid in fish from different parts of the world, there are few studies in the central region of Argentina, despite the prevalence observed in recent years. In the present study we provide new records and analyze ecological aspects of anisakid from fish of different aquatic systems with different hydrological characteristics from central Argentina. A total of 1402 individuals belonging to nine species, six families and four orders of fish were examined. The helminths were found in Astyanax eigenmanniorum (Characidae), Oligosarcus jenynsii (Characidae), Odontesthes bonariensis (Atherinopsidae), Hoplias malabaricus (Erythrinidae), Pimelodus albicans (Pimelodidae) and Rhamdia quelen (Pimelodidae). The last three host species showed up to 100% prevalence and maximum intensities of 162, 180 and 48 larvae/fish, respectively. All parasites found coincide with larvae of Contracaecum sp. type 2.El género Contracaecum pertenece a la familia Anisakidae, la cual incluye parásitos de considerable importancia económica y médica. Las larvas de Contracaecum están asociadas con una amplia variedad de peces marinos y de agua dulce. Si bien, hay una gran cantidad de reportes que indican la presencia de anisákidos en peces de diferentes partes del mundo, los estudios en la región central de Argentina son escasos, pese a las prevalencias observadas en años recientes. Este estudio proporciona nuevos registros y analiza aspectos ecológicos de larvas de Contracaecum presentes en peces de ambientes acuáticos con diferentes características hidrológicas ubicados en el centro de Argentina. Se examinó un total de 1402 peces pertenecientes a nueve especies, seis familias y cuatro órdenes. Los helmintos fueron hallados en Astyanax eigenmanniorum (Characidae), Oligosarcus jenynsii (Characidae), Odontesthes bonariensis (Atherinopsidae), Hoplias malabaricus (Erythrinidae), Pimelodus albicans (Pimelodidae) y Rhamdia quelen (Pimelodidae). Estas últimas tres especies hospedadoras exhibieron prevalencias de hasta 100% e intensidades máximas de 162, 180 y 48 larvas/pez, respectivamente. La totalidad de los parásitos hallados se corresponden con larvas de tercer estadio de Contracaecum sp., compatibles con el tipo 2