First record of Dichelyne (Dichelyne) bonacii (Nematoda, Cucullanidae) parasitizing the intestine of two species of lutjanid fish (Perciformes, Lutjanidae) on the northeast Brazilian coast.

Lutjanids are marine fish and commonly inhabit coral reefs, which have migratory habits and feed in a general way, due to these characteristics, are susceptible to infections by parasites, such as cuculanid nematodes. This work aimed to report for the first time, the occurrence of Dichelyne (Dichelyne) bonacii in Brazil, in two new hosts, Lutjanus analis and Rhomboplites aurorubens, acquired from local artisanal fishermen at the Aracaju city public fishing terminal (10 ° 54'17 "S37 ° 2'56" W), northeast coast of Brazil. Adult nematodes were collected from the intestinal tract of the hosts, clarified in Aman's Lactophenol and were briefly described here. Three adult males and five gravid females were found, indicating that the two species of fish acted as definitive hosts. Currently, this species of parasite has been reported only from fish collected in the coast of Mexico, which makes this work the first record of this parasite in Brazilian coastal waters. The results show that probably the range of hosts and the distribution of D. (Dichelyne) bonacii is not as restricted as data pointed in the literature, being a little wider, extending also to waters that bathe the Brazilian coast.

Occurrence of Isopods in Two Species of Snappers (Lutjanidae) from Northeast Brazil.

Parasitic isopod species are poorly known in the northeastern coast of Brazil. In this sense, this study presents novel records of Isopoda of the families Aegidae, Cymothoidae, and Corallanidae. A total 69 specimens of Lutjanus analis and 19 of Lutjanus jocu, of which 46 isopods from 3 different species were collected, i.e. Rocinela signata, Cymothoa excisa, and Excorallana richardsoni. The species R. siganata and E. richardsoni are reported for the first time in L. jocu. A significant relationship between the parasite R. signata and the size of the fish L. jocu was also observed. The isopod C. excisa is considered an incidental finding in L. analis. To the authors' knowledge, this is the first report of this species in fish from Brazil. The three species of isopods are new occurrences in the State of Sergipe, northeast region of the country. An additional morphological characteristic observed in the dorsal setae of pleotelson in specimens of E. richardsoni was that one end of this structure wws bifid. This information contributes to the current body of knowledge of the morphology of this particular species.

Gill parasites of fish from two estuaries in northeastern Brazil: new hosts and geographical records.

Parasites are important components of communities and constitute great part of the biological diversity found in ecosystems, providing valuable information about their hosts and the environment in which they live. However, despite its importance, parasitic diversity is still not well known in some regions of Brazil, especially with respect to fish parasites in the Northeast Region. The present study aims to perform the survey of gill parasites of fish from two tropical estuaries located in northeastern Brazil: Paraíba and Mamanguape rivers. Two collections were made in each estuary, one during the dry period (November / 2013) and the other during the rainy season (July / 2014). The fish were caught using a beach seine net, dragged along the main channel margin. After the identification, biometry and necropsy of the fish, their parasites were collected, stored and identified. For each species of parasite, the values ​​of prevalence, mean intensity and mean abundance were calculated. Of the 882 examined fish, belonging to four species, 145 were parasitized by at least one species of parasite. In total, 18 taxa of parasites of the groups Monogenea, Digenea, Nematoda, Copepoda and Isopoda were recorded, being the copepod Acusicola brasiliensis the most abundant species of parasite.

Gill parasites of fish from two estuaries in northeastern Brazil: new hosts and geographical records

ABSTRACT Parasites are important components of communities and constitute great part of the biological diversity found in ecosystems, providing valuable information about their hosts and the environment in which they live. However, despite its importance, parasitic diversity is still not well known in some regions of Brazil, especially with respect to fish parasites in the Northeast Region. The present study aims to perform the survey of gill parasites of fish from two tropical estuaries located in northeastern Brazil: Paraíba and Mamanguape rivers. Two collections were made in each estuary, one during the dry period (November / 2013) and the other during the rainy season (July / 2014). The fish were caught using a beach seine net, dragged along the main channel margin. After the identification, biometry and necropsy of the fish, their parasites were collected, stored and identified. For each species of parasite, the values ​​of prevalence, mean intensity and mean abundance were calculated. Of the 882 examined fish, belonging to four species, 145 were parasitized by at least one species of parasite. In total, 18 taxa of parasites of the groups Monogenea, Digenea, Nematoda, Copepoda and Isopoda were recorded, being the copepod Acusicola brasiliensis the most abundant species of parasite.

Novas regiões de ocorrência de Clinostomum sp. (Digenea: Clinostomidae) no Brasil

A infestação por metacercárias de Clinostomum sp. nos peixes causa a chamada doença dos pontos amarelos, provocando uma aparência desagradável nos peixes e ocasionando o descarte destes, tanto para fins de consumo quanto para fins ornamentais. O presente trabalho relata a ocorrência de metacercárias deste parasito em Pterophyllum scalare em um estabelecimento comercial de peixes ornamentais de Florianópolis-SC, assim como do parasito adulto em uma ave aquática resgatada no interior do estado de São Paulo. Estes relatos indicam que este parasito também completa seu ciclo de vida em ambientes confinados, havendo necessidade do controle de animais invasores, no caso moluscos e aves, para evitar a proliferação parasitária em ambientes de piscicultura, além de indicar a ampliação de sua distribuição no Brasil. (AU)

Infestation by Clinostomum sp. metacercariae in fish causes the yellow spotted disease, promoting an unpleasant appearance in fish and causing the disposal of these, both for consumption and for ornamental purposes. This paper reports the occurrence of metacercariae of this parasite in Pterophyllum scalare in a commercial establishment of ornamental fish from Florianópolis-SC, as well as the adult parasite in an aquatic bird rescued in the state of São Paulo. These reports also indicate that this parasite completes its life cycle in confined environments, requiring the control of invasive animals, molluscs and birds in case, to avoid parasitic proliferation in fish environments, besides indicating the expansion of its distribution in Brazil. (AU)

Novas regiões de ocorrência de Clinostomum sp. (Digenea: Clinostomidae) no Brasil

A infestação por metacercárias de Clinostomum sp. nos peixes causa a chamada doença dos pontos amarelos, provocando uma aparência desagradável nos peixes e ocasionando o descarte destes, tanto para fins de consumo quanto para fins ornamentais. O presente trabalho relata a ocorrência de metacercárias deste parasito em Pterophyllum scalare em um estabelecimento comercial de peixes ornamentais de Florianópolis-SC, assim como do parasito adulto em uma ave aquática resgatada no interior do estado de São Paulo. Estes relatos indicam que este parasito também completa seu ciclo de vida em ambientes confinados, havendo necessidade do controle de animais invasores, no caso moluscos e aves, para evitar a proliferação parasitária em ambientes de piscicultura, além de indicar a ampliação de sua distribuição no Brasil.

Infestation by Clinostomum sp. metacercariae in fish causes the yellow spotted disease, promoting an unpleasant appearance in fish and causing the disposal of these, both for consumption and for ornamental purposes. This paper reports the occurrence of metacercariae of this parasite in Pterophyllum scalare in a commercial establishment of ornamental fish from Florianópolis-SC, as well as the adult parasite in an aquatic bird rescued in the state of São Paulo. These reports also indicate that this parasite completes its life cycle in confined environments, requiring the control of invasive animals, molluscs and birds in case, to avoid parasitic proliferation in fish environments, besides indicating the expansion of its distribution in Brazil.

Behavioral changes caused by Austrodiplostomum spp. in Hoplias malabaricus from the São Francisco River, Brazil.

Traira (Hoplias malabaricus) is a neotropical fish that is widely distributed in freshwater environments in South America. In the present study, we documented the occurrence of metacercariae of Austrodiplostomum spp. (Diplostomidae) in the eyes and cranial cavity of H. malabaricus and described parasite-induced behavioral changes in the host. The fish were collected from the upper São Francisco River, in the Serra da Canastra mountain range, Minas Gerais, transported alive to the laboratory, observed for 2 weeks, and subsequently examined for parasites. Of the 35 fish examined, 28 (80 %) had free metacercariae in the vitreous humor (mean intensity=95.4; mean abundance=76.3), and 24 (68.57 %) had free metacercariae in the cranial cavity, mainly concentrated below the floor of the brain, at the height of the ophthalmic lobe (mean intensity=12.91; mean abundance=8.85). Specimens of H. malabaricus with a high intensity of infection in the brain displayed changes in swimming behavior.