Resumo
In the period of October 2007 to August 2008, 152 specimens ofPygocentrus nattereri were caught in the Negro River in the Nhecolândia region, central Pantanal wetland, State of Mato Grosso do Sul, Brazil. The specimens were necropsied and a total of 4,212 metazoan endoparasites were recovered, belonging to 10 taxons:Procamallanus (Spirocamallanus)inopinatus, Philometridae gen. sp.,Eustrongylides sp., Brevimulticaecum sp.,Contracaecum sp. (Nematoda), Echinorhynchus paranensis (Acanthocephala), Leiperia gracile,Sebekia oxycephala, Subtriquetra sp. 1 andSubtriquetra sp. 2 (Pentastomida). This is the first record of two parasite species from P. nattereri: E. paranensis and L. gracile.
No período de outubro de 2007 a agosto de 2008, 152 espécimes dePygocentrus nattereri foram capturados no rio Negro na região da Nhecolândia, parte central do Pantanal, Mato Grosso do Sul, Brasil. Os espécimes foram necropsiados e um total de 4.212 endoparasitas metazoários foram colhidos, pertencentes a 10 táxons: Procamallanus(Spirocamallanus) inopinatus, Philometridae gen. sp., Eustrongylides sp.,Brevimulticaecum sp., Contracaecum sp. (Nematoda), Echinorhynchus paranensis (Acanthocephala),Leiperia gracile, Sebekia oxycephala,Subtriquetra sp. 1 e Subtriquetra sp. 2 (Pentastomida). Este é o primeiro registro de duas espécies de parasitas emP. nattereri: E. paranensis e L. gracile.
Resumo
In order to inventory the metazoan endoparasites of Serrasalmus marginatus, 91 specimens were examined. They were captured in the Negro River in Pantanal wetland, State of Mato Grosso do Sul, Central-Western Brazil, from October 2007 to August 2008. Parasites of six taxa were recovered: Procamallanus (Spirocamallanus) inopinatus, Contracaecum sp. (Nematoda), metacercarial type Diplostomulum (Digenea), Brevimulticaecum sp. (Nematoda) and Sebekia oxycephala, Subtriquetra sp. 1 and Subtriquetra sp. 2 (Pentastomida). The latter five species are reported for the first time in S. marginatus.
Com o objetivo de inventariar os metazoários endoparasitos em Serrasalmus marginatus, no Rio Negro, Pantanal, Mato Grosso do Sul, Brasil, foram examinados 91 espécimes capturados no período de outubro de 2007 a agosto de 2008. Foram registrados seis táxons parasitos: Procamallanus (Spirocamallanus) inopinatus, Contracaecum sp. (Nematoda), metacercária do tipo Diplostomulum (Digenea); Brevimulticaecum sp. (Nematoda); e Sebekia oxycephala, Subtriquetra sp. 1 e Subtriquetra sp. 2 (Pentastomida). As últimas cinco espécies citadas são registradas pela primeira vez em S. marginatus.
Resumo
Aphanoblastella juizforense sp. nov. is described in the gills of the heptapterid fish Rhamdia quelen (Quoy et Gaimard, 1824) from the Paraibuna River, Juiz de Fora, Minas Gerais State, Brazil. The new species can be separated from all congeners by the long coiled copulatory organ with one counterclockwise ring; sinuous accessory piece and for the robust shape of the ventral bar.
Aphanoblastella juizforense sp. nov. is described in the gills of the heptapterid fish Rhamdia quelen (Quoy et Gaimard, 1824) from the Paraibuna River, Juiz de Fora, Minas Gerais State, Brazil. The new species can be separated from all congeners by the long coiled copulatory organ with one counterclockwise ring; sinuous accessory piece and for the robust shape of the ventral bar.
Resumo
Neascus-type metacercariae, which cause the black spot disease, are described in specimens collected from 33 samples of Geophagus brasiliensis from the Peixe river, in Monte Verde, Juiz de Fora, state of Minas Gerais, Brazil, during March and May 2006. The main morphological features of these metacercariae are: genital primordia composed of three cell masses located in the hind body, and a median dorsal vessel of the reserve bladder around the acetabulum. Thirty fish specimens (90.9%) were parasitized by metacercariae, with mean infection intensity of 15.6 ± 16.1 (1-75). Also, a positive correlation was detected between G. brasiliensis total length and the parasite abundance (r = 0.459; p 0.01).
A metacercária de Neascus sp., causadora da doença dos pontos pretos, é descrita em espécimes de Geophagus brasiliensis coletados no Brasil. Entre março e maio de 2006, foram capturados 33 espécimes de G. brasiliensis, coletados com o auxílio de vara e anzol no Rio do Peixe, Monte Verde, município de Juiz de Fora, Estado de Minas Gerias. Dos 33 espécimes examinados, 30 (90,9%) apresentaram-se parasitados por metacercárias causadoras dos pontos pretos, com intensidade média de infecção de 15,6 ± 16,1 (1 75). Foi observada correlação significativa entre o comprimento total de G. brasiliensis e a abundância parasitária (r = 0,459; P 0,01). As principais características morfológicas desta metacercária foram: primórdio genital representado por três massas celulares, localizadas posteriormente na parte posterior do corpo e vaso mediano dorsal da bexiga de reserva se estendendo entorno do acetábulo.
Resumo
Hatschekia quadrabdominalis Yu, 1933 (Copepoda, Hatschekiidae), a parasite of Priacanthus arenatus (Cuvier, 1829) (Osteichthyes, Priacanthidae) in the Brazilian coast
Resumo
Between December 1999 and April 2000, fifty-eight specimens of big-eye Priacanthus arenatus from the coastal zone of Rio de Janeiro (22º55S, 43º12W), Brazil, were necropsied to study their infracommunities metazoan parasites. Thirteen species of metazoan parasites were identified and all fish were parasitized by two or more species, with mean (96,4±110). The copepods were themajority of parasite specimens collected, with 74.5%. The Simpson index for all parasite species was 0.127, indicating lack of dominance by any species in the parasite community. Hatschekia quadrabdominalis Yu, 1933 showed the higher frequency of dominance and mean relative dominance. The parasite species in P. arenatus showed the typical overdispersed pattern of distribution. The mean diversity in the infracommunities of P. arenatus was H=0.43±0.14, without correlation with the hoststotal body lenght and without differences betweenmale and female fish. The parasite community of P.arenatus was dominated by species with highprevalence values, but that composed a few numberof associations, thus, is considered as an intermediatetype among interactive ans isolacionist types.
Resumo
Aphanoblastella juizforense sp. nov. is described in the gills of the heptapterid fish Rhamdia quelen (Quoy et Gaimard, 1824) from the Paraibuna River, Juiz de Fora, Minas Gerais State, Brazil. The new species can be separated from all congeners by the long coiled copulatory organ with one counterclockwise ring; sinuous accessory piece and for the robust shape of the ventral bar.
Aphanoblastella juizforense sp. nov. is described in the gills of the heptapterid fish Rhamdia quelen (Quoy et Gaimard, 1824) from the Paraibuna River, Juiz de Fora, Minas Gerais State, Brazil. The new species can be separated from all congeners by the long coiled copulatory organ with one counterclockwise ring; sinuous accessory piece and for the robust shape of the ventral bar.
Resumo
Neascus-type metacercariae, which cause the black spot disease, are described in specimens collected from 33 samples of Geophagus brasiliensis from the Peixe river, in Monte Verde, Juiz de Fora, state of Minas Gerais, Brazil, during March and May 2006. The main morphological features of these metacercariae are: genital primordia composed of three cell masses located in the hind body, and a median dorsal vessel of the reserve bladder around the acetabulum. Thirty fish specimens (90.9%) were parasitized by metacercariae, with mean infection intensity of 15.6 ± 16.1 (1-75). Also, a positive correlation was detected between G. brasiliensis total length and the parasite abundance (r = 0.459; p 0.01).
A metacercária de Neascus sp., causadora da doença dos pontos pretos, é descrita em espécimes de Geophagus brasiliensis coletados no Brasil. Entre março e maio de 2006, foram capturados 33 espécimes de G. brasiliensis, coletados com o auxílio de vara e anzol no Rio do Peixe, Monte Verde, município de Juiz de Fora, Estado de Minas Gerias. Dos 33 espécimes examinados, 30 (90,9%) apresentaram-se parasitados por metacercárias causadoras dos pontos pretos, com intensidade média de infecção de 15,6 ± 16,1 (1 75). Foi observada correlação significativa entre o comprimento total de G. brasiliensis e a abundância parasitária (r = 0,459; P 0,01). As principais características morfológicas desta metacercária foram: primórdio genital representado por três massas celulares, localizadas posteriormente na parte posterior do corpo e vaso mediano dorsal da bexiga de reserva se estendendo entorno do acetábulo.
Resumo
Between December 1999 and April 2000, fifty-eight specimens of big-eye Priacanthus arenatus from the coastal zone of Rio de Janeiro (22º55S, 43º12W), Brazil, were necropsied to study their infracommunities metazoan parasites. Thirteen species of metazoan parasites were identified and all fish were parasitized by two or more species, with mean (96,4±110). The copepods were themajority of parasite specimens collected, with 74.5%. The Simpson index for all parasite species was 0.127, indicating lack of dominance by any species in the parasite community. Hatschekia quadrabdominalis Yu, 1933 showed the higher frequency of dominance and mean relative dominance. The parasite species in P. arenatus showed the typical overdispersed pattern of distribution. The mean diversity in the infracommunities of P. arenatus was H=0.43±0.14, without correlation with the hoststotal body lenght and without differences betweenmale and female fish. The parasite community of P.arenatus was dominated by species with highprevalence values, but that composed a few numberof associations, thus, is considered as an intermediatetype among interactive ans isolacionist types.
Resumo
Hatschekia quadrabdominalis Yu, 1933 (Copepoda, Hatschekiidae), a parasite of Priacanthus arenatus (Cuvier, 1829) (Osteichthyes, Priacanthidae) in the Brazilian coast