PRIMER REGISTRO DE METACERCARIAS (DIGENEA) INFECTANDO ASTRONOTUS OCELLATUS (PERCIFORMES: CICHLIDAE) DE LA REGIÓN AMAZÓNICA, BRASIL

This study aimed to report infection by metacercariae ofthe genera Posthodiplostomum Dubois, 1936 (Diplostomidae) and Herpetodiplostomum Dubois, 1936 (Proterodiplostomidae) in the gills of Oscar Astronotus ocellatus Agassiz, 1831 (Cichlidae) from Lake Pracuúba, in the municipality of Pracuúba, State of Amapá (eastern Amazonia), Brazil. Out of 202 A. ocellatus examined, 142 had gills infected by metacercariae of Herpetodiplostomum sp. (prevalence= 70.3%) and Posthodiplostomum sp. (prevalence= 59.4%). However, 97 hosts were infected by both metacercariae species (prevalence= 48.0%). A total of 1123 specimens of Herpetodiplostomum sp. and 463 specimens of Posthodiplostomum sp. were collected and the mean intensity of infection was 7.8 ± 11.6 and 3.9 ± 4.4, respectively. This is the first report of Digenea in A. ocellatus.Este estudio tiene como objetivo el registro de la infestación por metacercarias de los géneros Posthodiplostomum Dubois, 1936 (Diplostomidae) y Dubois Herpetodiplostomum, 1936 (Proterodiplostomidae) en las branquias del Astronotus ocellatus Agassiz, 1831 (Cichlidae) del lago Pracuúba, en el Municipio de Pracuúba, Estado de Amapá, Brasil. De doscientos ejemplares de A. ocellatus examinados, 142 tenian las branquias infestadas por Herpetodiplostomum sp. (prevalencia = 70,3%) y por Posthodiplostomum sp. (prevalencia = 59,4%). Sin embargo 97 hospederos fueron infestados por estas dos especies de metacercarias (prevalencia = 48,0%). Del total de ejemplares de A. ocellatus examinados fueron extraidos 1.123 parasitos de Herpetodiplostomum sp. y 463 parasitos de Posthodiplostomum sp., y la media de intensidad de la infestación fue de 7,8 ± 3,9 y 11,6 ± 4,4, respectivamente. Este es el primer registro de Digenea en A. ocellatus

Low levels of crustacean parasite infestation in fish species from the Matapi River in the state of Amapá, Brazil

Abstract This first study investigated the crustacean parasite fauna in 66 species of fish from the Matapi River basin, state of Amapá (Brazil). Fish were collected every two months between March 2012 and August 2013, encompassing dry and rainy seasons. Among the 66 species examined (corresponding to 722 fish specimens) only 11 species were parasitized. The infestation prevalence was 2.2%, and a total of 48 specimens of parasites were distributed between three different parasite groups. These included Argulus elongatus, Dolops reperta and Argulus multicolor (Branchiura), Ergasilus xinguensis and Gamidactylus sp. (Copepoda), and Isopoda (Braga patagonica), but branchiuran species were predominant. This was the first report of these parasite species for Leporinus fasciatus, Astyanax bimaculatus, Curimata incompta, Pygocentrus nattereri, Crenicichla cincta, Crenicichla johanna, Geophagus camopiensis, Pterophyllum scalare, Plagioscion squamosissimus, Hypostomus plecostomus and Propimelodus eigenmanni. Lastly, this study expands the range of occurrence of these six parasite species to the Matapi River basin in eastern Amazon

Aspectos ecológicos dos parásitos en Cichlasoma bimaculatum (Cichlidae), pez ornamental de la Amazonia brasileña

Este estudio investigó la fauna parasitaria de Cichlasoma bimaculatum (Cichlidae) en un afluente del sistema del Río Amazonas, en el norte de Brasil. La prevalencia parasitaria fue del 94,6 % y en total, 428267 parásitos fueron colectados, tales como Ichthyophthirius multifiliis, Piscinoodinium pillulare (Protozoa), Gussevia arilla (Monogenoidea), Posthodiplostomum sp. (Digena) y Procamallanus (Spirocamallanus) nopinatus (Nematoda). Aunque el predominio fue de I. multifiliis, el nematodo P. (S.) inopinatus fue la especie menos frecuente y abundante. Estas especies de parásitos mostraron un patrón de dispersión agregada. La fauna parasitaria se caracterizó por la presencia de algunas pocas especies de parásitos con mayor prevalencia y abundancia de ectoparásitos y una baja presencia de endoparásitos. Se discute que lo anterior puede deberse al modo de vida del hospedero y sugieren que C. bimaculatum ocupa un bajo nivel en la cadena trófica.This study investigated the parasitic fauna of Cichlasoma bimaculatum of a tributary from the Amazon River system, northern Brazil. The prevalence of infection was 94.6 % and, in total, 428,267 parasites, such as Ichthyophthirius multifiliis, Piscinoodinium pillulare (Protozoa), Gussevia arilla (Monogenoidea), Posthodiplostomum sp. (Digenea) and Procamallanus (Spirocamallanus) inopinatus (Nematoda) were collected. However, the dominance was mainly of I. multifiliis, while P. (S.) inopinatus was the parasite species with the lower levels of prevalence and abundance of infection. These parasite species showed an aggregated dispersion pattern. The parasitic fauna was characterized by the presence of few species of parasites with high prevalence and abundance, specifically ectoparasites, and a low number of endoparasites. The observed pattern is explained by the mode of life of the host and it is suggested that C. bimaculatum occupies a low trophic level at the food web

Parasites in Curimata cyprinoides (Characiformes: Curimatidae) from eastern Amazon, Brazil - doi: 10.4025/actascibiolsci.v35i4.19649

This work is the first study on parasitic fauna of Curimata cyprinoides Linnaeus, 1766 (Curimatidae) and the host-parasite relationship. The total of 154,740 parasites such as Ichthyophthirius multifiliis (Ciliophora), trophozoite of Spironucleus sp. (Hexamitidae), Urocleidoides sp. (Monogenoidea), Digenea gen. sp. and Polymorphus sp. (Polymorphidae) were collected. The component community showed low diversity (HB = 0.004 ± 0.020) and parasite species richness (1.4 ± 0.6). However, I. multifiliis and Urocleidoides sp. were prevalent and with higher intensity on the host population and also aggregated the distribution pattern. The occurrence of these ectoparasites in C. cyprinoides may be a consequence of its alimentary diet. Positive correlation between the abundance and size of I. multifiliis and the relative condition factor of the host were observed and discussed. These data represent increased knowledge of the biology of these parasites. Furthermore, this study expanded the geographic distribution of some parasite species for this new host from Brazil.  

Fauna parasitária de tambaqui Colossoma macropomum (Characidae) cultivado em tanque-rede no estado do Amapá, Amazônia oriental Parasitic fauna of tambaqui Colossoma macropomum(Characidae) farmed in cages in the State of Amapá, eastern Amazon

O objetivo principal deste trabalho foi estudar a parasitofauna e a relação hospedeiro- parasito em tambaqui Colossoma macropomum cultivados em tanques-rede no Rio Matapi, município de Santana, estado do Amapá, região da Amazônia oriental, Brasil. Foram examinados 60 tambaquis, dos quais 96,7% estavam parasitados por protozoários Ichthyophthirius multifiliis (Ciliophora) e Piscinoodinium pillulare (Dinoflagellida), monogenoideas Mymarotheciun boegeri e Anacanthorus spathulatus (Dactylogyridae) e sanguessugas Glossiiphonidae gen. sp. (Hirudinea). Os maiores níveis de parasitismo foram causados por protozoários I. multifiliis e P. pillulare e os menores por sanguessugas Glossiiphonidae gen. sp. Porém, os índices de infestação não tiveram efeitos na saúde dos peixes hospedeiros, uma vez que o fator de condição relativo (Kn) não foi estatisticamente (p<0,05) correlacionado com a intensidade desses parasitos. Este foi o primeiro relato da ocorrência de I. multifiliis e P. pillulare em C. macropomum cultivados em tanques-rede na Amazônia brasileira.<br>The purpose of this paper was to evaluate the parasitic fauna and the host-parasite relationship in Colossoma macropomum farmed in cages of Matapi River, municipally of Santana, State of Amapá, in eastern Amazon, Brazil. Of 60 specimens of tambaqui examined, 96.7% were parasitized by protozoans Ichthyophthirius multifiliis (Ciliophora) and Piscinoodinium pillulare (Dinoflagellida), monogenoideans Mymarotheciun boegeri and Anacanthorus spathulatus (Dactylogyridae), and leeches Glossiphoniidae gen. sp. (Hirudinea). The higher infestation levels were caused by protozoans I. multifiliis and P. pillulare, while the lower infestation levels were caused by leeches. No effects of parasitic infestation rates on fish health were observed. The relative condition factor (Kn) was not correlated with the intensity of parasites found. This was the first record of I. multifiliis and P. pillulare in C. macropomum farmed in cages in the Brazilian Amazon