Abstract Fish parasites are an important part of aquatic biodiversity and knowing these species and their interactions with their hosts helps in monitoring the aquatic biota. The present study investigated the ectoparasite crustacean fauna of ten fish species from the upper Araguari River, in the state of Amapá, northern Brazil. A total of 508 fish were collected and analyzed from July to November 2014, of which 82.6% (109) were parasitized by one or more crustacean ectoparasite species. In the ten host fish species, a total of 308 ectoparasite specimens were collected, from 12 taxa, such as Argulus multicolor Stekhoven, 1937, Argulus spinulosus Silva, 1980, Argulus sp.1, Argulus sp.2, Argulus sp.3, Dipteropeltis sp., Dipteropeltis hirundo Calman, 1912, Dolops bidentata Bouvier, 1899, Dolops striata Bouvier, 1899 (Argulidae), Braga fluviatilis Richardson, 1911, Braga amapaensis Thatcher, 1996 (Cymothoidae) and Excorallana berbicensis Boone, 1918 (Corallanidae). Higher levels of prevalence and abundance were recorded for Hoplias aimara (Valenciennes, 1847) and Tometes trilobatus Valenciennes, 1850, respectively. These ectoparasites were found in the fins, integument, mouth, and anus of the host fish. Argulus sp.2 and D. bidentata were the most abundant parasites (65.1%), and had the highest species richness. This study registered 36 novel host-parasite interactions, and thus represents a new record for all host species here examined. biota River Amapá Brazil 50 2014 826 82 6 82.6 109 (109 30 1 taxa Stekhoven 1937 Silva 1980 sp1 sp sp.1 sp2 2 sp3 3 sp.3 sp. Calman 1912 Bouvier 189 Argulidae, Argulidae , (Argulidae) Richardson 1911 Thatcher 199 Cymothoidae (Cymothoidae Boone 191 Corallanidae. Corallanidae . (Corallanidae) Valenciennes (Valenciennes 1847 1850 respectively fins integument mouth D 65.1%, 651 65.1% 65 (65.1%) richness hostparasite parasite examined 5 201 8 82. 10 (10 193 198 18 (Argulidae 19 (Corallanidae 184 185 65.1 (65.1% 20 (1 65. (65.1 ( (65. (65 (6

Abstract This study investigated the spatial distribution, parasite interactions, and affinities of Branchiura parasites according to macrohabitat and surface type on fish from the Araguari River, Amapá State, in the Brazilian Amazon. This study presents novel information on the interactions of branchiuran species with host fish, and how the morphology of their attachment structures is associated with different host surface morphologies, with and without scales. A total of 558 fish specimens of 26 species were collected, of which 109 fish (10 species) were parasitized by at least one branchiuran parasite; these were selected for further study. The parasites were collected from the buccal cavity, gills, fins, and integument of the host fish. Parasites with suction discs (Argulus) were mainly associated to hosts with small scales and no scales, while parasites with hooks (Dolops) were mainly associated to hosts with large scales. Overall, parasites with suction discs were more specialized per site than those with hooks. distribution River State Amazon morphologies 55 2 10 (1 cavity gills fins Argulus (Argulus Dolops (Dolops Overall 5 1 (

Abstract This review surveyed information on Caligus Müller, 1785 to identify global infestation patterns and geographic distribution in teleost fishes, as well as physiological and histopathological data and description of treatment strategies. A total 990 samples of Caligus spp. (N = 212 species) obtained of 233 scientific papers on farmed and wild teleost species from 99 families and 30 orders were used, and the highest number of occurrences was on Carangidae. Caligus spp. was predominantly found in marine environments, and only Caligus lacustris and Caligus epidemicus were found in teleost fish of freshwater environments. There was a high prevalence of Caligus spp. on hosts and infestation occurred predominantly in both the tegument and the gills. Caligus species are distributed across different countries and some particularities were identified and discussed. Caligus elongatus and Caligus bonito bonito had the broadest geographic distribution. Histomorphological and hematological disorders caused by infestation by Caligus spp. were reported and discussed, as well as chemotherapeutic products used for controlling and treating the infestations. Variation in the distribution and geographic patterns of Caligus spp. were little evident in many ecosystems and due to the limited data on the infestation of these sea lice on teleost populations in different regions. Müller 178 fishes strategies spp N 21 23 9 3 Carangidae environments gills discussed infestations regions 17 2 1

ABSTRACT: The parasitic fauna of Podocnemididae species is of great relevance to understanding the ecological relationships of the organisms in this genus. The parasites can have a symbiotic relationship with their hosts; however, environmental imbalances may change this relationship. Therefore, these parasites may become agents that generate zoonoses, especially in animals used by parasites as a food source. The aim of this study was to investigate the gastrointestinal parasitic fauna of specimens of Podocnemis unifilis. The animals were collected from the Tocantins and Javaés Rivers, both of which flow in the State of Tocantins, predominantly in the Cerrado territory. Samples of stomach and intestinal contents were fixed in 10% formalin buffered with sodium phosphate, transferred to 70% alcohol for analysis, and separated after 72 hours. Parasites were isolated and identified according to morphology and identification key. Four species of parasites were observed in 100% of specimens of P. unifilis, namely Nematophila grandis (Trematoda) and Paratractis hystrix, Paraorientatractis semiannulata, and Orientatractis leiperi (Nematoda). N. grandis was the only parasite that was not observed in the intestine; it appeared to adhere to the inner wall of the stomach. All nematodes were observed both in the stomach and intestine. These data expand the knowledge related to the P. unifilis parasitic fauna and the geographic distribution of these parasites in P. unifilis from the Tocantins and Javaés Rivers. ABSTRACT genus hosts however Therefore zoonoses source Rivers territory 10 phosphate 70 analysis 7 hours key 100 P Trematoda (Trematoda hystrix semiannulata Nematoda. Nematoda . (Nematoda) N intestine 1 (Nematoda

RESUMO: A fauna parasitológica das espécies de Podocnemididae é de grande relevância para o conhecimento das relações ecológicas desse grupo de vertebrados. Os parasitos podem ocorrer em simbiose com os seus hospedeiros sem causar danos, mas o desequilíbrio ambiental pode causar um desequilíbrio nessa relação e, assim, serem agentes geradores de zoonoses, especialmente em animais que são utilizados como recurso alimentar. Esta pesquisa fez o levantamento da fauna parasitária gastrointestinal de espécimes de Podocnemis unifilis. Os animais foram coletados no rio Tocantins e Javaés, ambos no Estado do Tocantins, em território predominante de Cerrado. As amostras de conteúdo estomacal e intestinal foram fixadas em formol a 10% tamponado em fosfato de sódio, transferidas para álcool 70% para análise e separação após 72 horas. Os parasitos foram separados e identificados de acordo com morfologia e chave de identificação. Foram encontradas quatro espécies de parasitos com prevalência em 100% dos espécimes de P. unifilis, sendo elas Nematophila grandis (Trematoda) e Paratractis hystrix, Paraorientatractis semiannulata e Orientatractis leiperi (Nematoda). Somente N. grandis não foi observado no intestino, sendo encontrado somente aderido à parede interna do estômago. Todos os nematoides foram observados no estômago e intestino. Esses dados ampliam o conhecimento sobre a fauna parasitária de P. unifilis, e aumentam o conhecimento sobre a distribuição geográfica desses parasitos em P. unifilis dos Rios Tocantins e Javaés. RESUMO vertebrados danos assim zoonoses alimentar Javaés Cerrado 10 sódio 70 7 horas identificação 100 P Trematoda (Trematoda hystrix Nematoda. Nematoda . (Nematoda) N intestino 1 (Nematoda

Abstract Abstract: The aim of this study was to investigate the community of metazoan parasites in Hemibrycon surinamensis from the Matapi River, State of Amapá, Brazil. Among the 31 examined fish, 77.4 % were parasitized by Jainus hexops, Tereancistrum ornatus (Monogenea), Contracaecum sp. (Nematoda), Clinostomus marginatum and Posthodiplostomum sp. (Digenea). However, the dominance was of monogeneans J. hexops and T. ornatus, and among the endoparasites, the predominance was of species at the larval stage. The parasites showed random dispersion. Brillouin diversity index varied from 0 to 0.9, evenness from 0 to 0.7 and species richness from 0 to 3 parasites per host. Low levels of parasitic infection were observed and discussed. The results indicate that this intermediate host occupies a low position in the food web. This is the third eco-epidemiological study for H. surinamensis.