of the metazoan fauna of Pygocentrus nattereri (Kner, 1858) in Piranha Lake, (Amazonas, Brazil), and evaluation of its potential as an indicator of environmental health. Biota Neotrop. 11(1): http://www.biotaneotropica.org.br/v11n1/en/ abstract?article+bn03111012011. Abstract:The metazoan parasitic fauna of Pygocentrus nattereri collected in different phases of hydrologic cycle of Piranha lake was studied during the year of 2007. The study area is located in gas pipeline Coari-Manaus construction zone, near the municipality of Manacapuru-Am. The relationship between condition factor and parasite occurrence and the viability of use the parasitic fauna as an environmental bio-indicator were verified. The following Monogenoidea were collected: Amphithecium microphalum, Amphitecium brachycirrum, Amphitecium calycinum, Amphithecium catalaoensis, Amphithecium junki, Pithanothecium amazonensis e Rhinoxenus piranhus, as well as the nematode Procamallanus inopinatus, the copepod Miracetyma sp. and the isopod Anphira branchialis. There was not significant correlation between the parasite occurrence and the condition factor. There were significant variances in the parasitic index according to the different periods of hydrologic cycle and P. nattereri has achieved the conditions described in the literature to be select a fish-host and his parasite fauna as biomonitor.

The objective of this study was to investigate the parasites occurrences and to determine the rates of infestation/parasitic infection in juvenile Arapaima gigas from seven fish farms in the state of Amazonas, relating to the characteristics of these fish farms. Of the 70 A. gigas evaluated, 43 were infested/infected, with a total of 133 parasites collected. Three fish farms (2, 4, 6) showed the highest levels of prevalence of parasites (100%, 70%, 70%), mean intensity (4.1±2.6, 8.1±9.2, and 2.1±1.3), and mean abundance (4.1±2.6, 5.7±8.1, and 1.5±1.5), respectively. Prevalence ranged from 30% to 100%, mean intensity from 1.0 to 8.1 and mean abundance from 0.3 to 5.7. Monogenea, Digenea, Nematoda (Hysterothylacium sp. and Spirocamallanus sp.) and Acanthocephala (Neoechinorhynchus sp. and Polyacanthorhynchus sp.) were identified. The parasites Hysterothylacium sp. and Neoechinorhynchus sp. were the most prevalent parasites with 31.43% and 15.71%, respectively. The fish presented negative allometry in growth and constant condition factor. Measures to prevent and control the parasitic diseases diagnosed are discussed as well prophylactic practices that contribute to the biosecurity of the farms.

Two species of nematodes belonging to the genus Ichthyouris Inglis, 1962 (I. ro and I. bursata), were collected from the cichlid fish Mesonauta festivus in the central Brazilian Amazon region. Both species are reported in this locality for the first time. I. bursata is reported in a new host, M. festivus, and this is the first report of I. ro parasitizing its type host in Brazil. We provide a more detailed description for I. ro, including morphological aspects that were not mentioned in the original description.

Doscientos ochenta y nueve peces de 24 especies y cuatro órdenes fueron capturados en los lagos Catalão, Preto y Poraquê en la estación seca. Trece especies fueron parasitadas por metacercarias libres de Diplostomum (Austrodiplostomum) compactum (Lutz, 1928) en los ojos: Pygocentrus nattereri Kner, 1858, Serrassalmus elongatus Kner, 1858 (Serrasalmidae); Acestrorhynchus falcirostris (Cuvier, 1819) (Characidae); Satanoperca jurupari (Heckel, 1840); Geophagus surinamensis (Bloch, 1791), Crenicichla johanna Heckel, 1840, Mesonalta festivus (Heckel, 1840) (Cichlidae); Plagioscion squamosissimus Heckel, 1840 (Sciaenidae); Loricariichthys acutus Valenciennes, 1840, Pterygoplichthys pardalis (Castelnau, 1855) (Loricariidae); Pimelodus bloch Valenciennes, 1840 (Pimelodidae) y Pellona castellneana Valenciennes, 1847 (Pristigasteridae). Se recogieron un total de 1065 metacercarias libres de D. (A.) compactum. Plagioscion squamosissimus fue la especie con mayor abundancia de metacercarias con 640 individuos. Las especies de peces bentónicos fueron más parasitadas que las pelágicas.

O objetivo deste trabalho foi descrever a relação parasito-hospedeiro das metacercárias de Diplostomum sp. em Pterygoplichthys pardalis (Castelnau, 1855). No ano de 2012 foram realizadas quatro excursões a cinco lagos de várzea, quatro do rio Solimões: Baixio, Preto, Ananá, Araçá e um do rio Purus o lago São Tomé, localizados entre as cidades de Manaus e Coari no estado do Amazonas. Foram capturados e analisados 245 P. pardalis que tinham o comprimento padrão médio de 24,5 cm ± 8,8 e o peso médio de 213,9 g ± 102,6. Foram coletados 766 metacercárias livres de Diplostomum sp. e 10 indivíduos foram medidos em micrômetros (μm): comprimento 616,5 ± 86,9 (509,4 – 792); largura 278,4 ± 49 (221,4 – 360); comprimento da ventosa oral 35,7 ± 5,4 (24,5 – 44,1); comprimento da faringe 33,9 ± 6,6 (25,9 – 44,1). Órgão tribocítico 77,7 ± 21,7 (52,2 – 133,2) de comprimento e 79,7 ± 28 (54 – 156,6) de largura. As metacercárias de Diplostomum sp. ocorreram parasitando internamente e externamente o estômago e externamente o intestino, o fígado as gônadas e a superfície da cavidade geral do corpo e foram mais abundantes no período da seca.

Los perros son huéspedes primarios de un gran número de parásitos, que pueden afectar a la salud y el bienestar de estos animales y estos parásitos se transmiten a los seres humanos representando un riesgo para la salud, especialmente los niños, ancianos y personas inmunocomprometidas. Trece muestras de heces se recogieron a partir de un perro joven errante rescatado en el barrio Cidade Nova, en la zona norte de Manaus, Brasil se encontraron en las muestras de heces, 85 proglotides de Dipylidium caninum. Este es el tercer disco de D. caninum parásito perros callejeros en la ciudad de Manaus, Brasil.

La primera espécie de parásitos branquiales de Monogenoidea de la familia Mazocraeidae se ha registrado para un pez de agua dulce en Brasil. Mazocraeoides makrodemas n. sp. se describe en Pellona castelnaeana del Lago catalán em el río Solimões, Estado de Amazonas, Brasil. Las principales características que difieren de los otros son: la parte anterior del cuerpo tres veces superior a la posterior; dos áncoras laterales y dos áncoras internas.

Las etapas de desarrollo intramarsupiales de Braga patagonica Schiodt & Meinert, 1884 colectadas de peces en un lago de planicie amazónica, fueron indagadas. Las hembras grávidas fueron seleccionadas de acuerdo a su etapa de gestación. Sus huevos, embriones y larvas fueron medidos y dibujados. Seis estadios intramarsupiales fueron identificados, a saber, la masa de huevo, el huevo, la diferenciación de embriones I, diferenciación de embriones II, larva Pullus I, larva Pullus II más uno Manca III post- marsupial infecciosa nadadora libre.