Ergasilus tipurus n. sp. (Copepoda: Ergasilidae), A Parasite of Brazilian Amazon Fish Species

Abstract Cucullanus marajoara n. sp. (Cucullanidae) is reported to parasitize Colomesus psittacus (Tetraodontiformes), which is a fish species from the Marajó Archipelago, state of Pará, estuarine region of the Brazilian Amazon. The new species differs from similar species by the presence of a protruding upper lip on the cloacal opening, the distribution of the cloacal papillae: five pre-cloacal papillae pairs and 5 are ventral and located posteriorly to the pre-cloacal sucker and an unpaired papilla is located on the upper cloacal lip and five post-cloacal pairs, and a pair of lateral phasmids located between papillae pairs. Additionally, Cucullanus marajoara n. sp. is compared to other species of this genus described in Brazil, particularly Cucullanus ageneiosus and Cucullanus oswaldocruzi, which both occur in the same zoogeographic region of this study but parasitize fish of a different order (Siluriformes). Cucullanus dodsworthi and Cucullanus brevicaudatus are the only described species parasitizing fish of the order Tetradontiformes in Brazil, and the new species differs from these species by the distribution of the cloacal papillae and the host habitat. The description of Cucullanus marajoara n. sp. adds data to the biodiversity of described parasites that parasitize Tetradontiformes of the estuarine ichthyofauna in the Brazilian Amazon.

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‘Taking Fishers’ Knowledge to the Lab’: An Interdisciplinary Approach to Understand Fish Trophic Relationships in the Brazilian Amazon

Frontiers in Ecology and Evolution ◽

10.3389/fevo.2021.723026 ◽

2021 ◽

Vol 9 ◽

Author(s):

Paula Evelyn Rubira Pereyra ◽

Gustavo Hallwass ◽

Mark Poesch ◽

Renato Azevedo Matias Silvano

Keyword(s):

Stable Isotopes ◽

Food Webs ◽

Fish Species ◽

Trophic Interactions ◽

Brazilian Amazon ◽

Trophic Levels ◽

Trophic Relationships ◽

Ecological Knowledge ◽

Data Limitations ◽

Combining Data

Trophic levels can be applied to describe the ecological role of organisms in food webs and assess changes in ecosystems. Stable isotopes analysis can assist in the understanding of trophic interactions and use of food resources by aquatic organisms. The local ecological knowledge (LEK) of fishers can be an alternative to advance understanding about fish trophic interactions and to construct aquatic food webs, especially in regions lacking research capacity. The objectives of this study are: to calculate the trophic levels of six fish species important to fishing by combining data from stable isotopes analysis and fishers’ LEK in two clear water rivers (Tapajós and Tocantins) in the Brazilian Amazon; to compare the trophic levels of these fish between the two methods (stable isotopes analysis and LEK) and the two rivers; and to develop diagrams representing the trophic webs of the main fish prey and predators based on fisher’s LEK. The fish species studied were Pescada (Plagioscion squamosissimus), Tucunaré (Cichla pinima), Piranha (Serrasalmus rhombeus), Aracu (Leporinus fasciatus), Charuto (Hemiodus unimaculatus), and Jaraqui (Semaprochilodus spp.). A total of 98 interviews and 63 samples for stable isotopes analysis were carried out in both rivers. The average fish trophic levels did not differ between the stable isotopes analysis and the LEK in the Tapajós, nor in the Tocantins Rivers. The overall trophic level of the studied fish species obtained through the LEK did not differ from data obtained through the stable isotopes analysis in both rivers, except for the Aracu in the Tapajós River. The main food items consumed by the fish according to fishers’ LEK did agree with fish diets as described in the biological literature. Fishers provided useful information on fish predators and feeding habits of endangered species, such as river dolphin and river otter. Collaboration with fishers through LEK studies can be a viable approach to produce reliable data on fish trophic ecology to improve fisheries management and species conservation in tropical freshwater environments and other regions with data limitations.

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Length‐weight relationships of fish species from oxbow lakes on the floodplain of the middle Purus River in western Brazilian Amazon

Journal of Applied Ichthyology ◽

10.1111/jai.14013 ◽

2020 ◽

Vol 36 (2) ◽

pp. 256-258 ◽

Cited By ~ 1

Author(s):

Ronaldo Souza Silva ◽

Lucena Rocha Virgilio ◽

Fabiano Corrêa ◽

Lisandro Juno Soares Vieira

Keyword(s):

Fish Species ◽

Brazilian Amazon ◽

Oxbow Lakes

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Length–weight relationships for six fish species found in a floodplain lake of the Madeira River, Brazilian Amazon

Journal of Applied Ichthyology ◽

10.1111/jai.14083 ◽

2020 ◽

Vol 36 (6) ◽

pp. 842-844

Author(s):

Severino Adriano de Oliveira Lima ◽

Raniere Garcez Costa Sousa

Keyword(s):

Fish Species ◽

Brazilian Amazon ◽

Floodplain Lake ◽

Madeira River

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Parasitic fauna of eight species of ornamental freshwater fish species from the middle Negro River in the Brazilian Amazon Region

Revista Brasileira de Parasitologia Veterinária ◽

10.1590/s1984-29612010000200007 ◽

2010 ◽

Vol 19 (2) ◽

pp. 103-107 ◽

Cited By ~ 19

Author(s):

Marcos Tavares-Dias ◽

Jefferson Raphael Gonzaga Lemos ◽

Maurício Laterça Martins

Keyword(s):

Freshwater Fish ◽

Fish Species ◽

Brazilian Amazon ◽

Amazon Region ◽

Parasitic Fauna ◽

Freshwater Fish Species ◽

Negro River ◽

Brazilian Amazon Region

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Factors controlling Hg levels in two predatory fish species in the Negro river basin, Brazilian Amazon

The Science of The Total Environment ◽

10.1016/j.scitotenv.2006.03.033 ◽

2006 ◽

Vol 367 (1) ◽

pp. 451-459 ◽

Cited By ~ 42

Author(s):

Lauren Belger ◽

Bruce Rider Forsberg

Keyword(s):

River Basin ◽

Fish Species ◽

Brazilian Amazon ◽

Predatory Fish ◽

Negro River

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Metacercariae of Austrodiplostomum spp. (Digenea: Diplostomidae) infecting the eyes and brains of fish in Brazilian Amazon

Arquivos do Instituto Biológico ◽

10.1590/1808-1657000932018 ◽

2019 ◽

Vol 86 ◽

Author(s):

Márcio Jonathan Soares Lima ◽

Renato Pastor Veiga ◽

Luciclara Ferreira de Sousa ◽

Maxwell Barbosa de Santana ◽

Marcos Sidney Brito Oliveira ◽

...

Keyword(s):

Optic Nerve ◽

Fish Species ◽

River System ◽

Brazilian Amazon ◽

Vitreous Humor ◽

Infected Fish ◽

Cranial Vault ◽

Amazon River ◽

Low Level ◽

The Brain

ABSTRACT: The aim of this paper was to report the occurrence of Austrodiplostomum spp. in the eyes and brain of Acaronia nassa, Caquetaia spectabilis, Satanoperca acuticeps, Curimatella sp. and Crenicichla marmorata in a lake of the Amazon River system in the state of Pará (Brazil). Of 49 fish examined, 10.2% were parasitized by Austrodiplostomum spp. metacercariae, and A. nassa was the host with higher number of metacercariae. In five examined fish species, a total of 51 metacercariae were collected, with 45 found in the eyes and 6 in the cranial vault. In the eyes, the metacercariae were free and active in the vitreous humor, but no opacification was observed. In the brain, the metacercariae were also free and active, and located mainly below the encephalon, on the cranial floor, at the height of the ophthalmic lobes and near the optic nerve. In laboratory observations, however, the infected fish did not exhibit any behavioral disorders, and this may be related to the low level of parasitism. This was the first report of this digenean for C. spectabilis, S. acuticeps, Curimatella sp., C. marmorata and A. nassa.

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