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Quarenta e um espécimes do mandi-amarelo Pimelodus maculatus Lacépède, 1803 (Siluriformes: Pimelodidae) e54 espécimes do jundiá Rhamdia quelen (Quoy & Gaimard, 1824)(Siluriformes: Heptapteridae) foram coletados noRio Paraíba do Sul, Volta Redonda, Estado do Rio de Janeiro, entre novembro de 2007 e outubro de 2008. Os peixesforam necropsiados para o estudo das suas infracomunidade de metazoários parasitos. Foram coletadas as mesmas trêsespécies de metazoários parasitos nas duas espécies de peixes estudadas. Estes foram um monogenético, um nematóidee um hirudíneo. Cucullanus pinnai (Travassos, Artiga e Pereira, 1928) (Nematoda: Cucullanidae) e Aphanoblastella sp.(Monogenea: Dactylogyridae) foram as espécies dominantes com os maiores valores de prevalência em P. maculatus eR. quelen, respectivamente. As espécies de parasitos de P. maculatus e R. quelen apresentaram típico padrão de distribuiçãosuperdispersa. Nenhum parasito apresentou correlação significativa entre o comprimento total dos siluriformes estudadose a prevalência e abundância parasitária. A riqueza parasitária apresentou média de 0,87 ± 0,67 (0 - 2) e 0,57 ± 0,56(0 - 2) em P. maculatus e R. quelen, respectivamente, e sem correlação com o comprimento total dos hospedeiros. (AU)

Forty-one specimens of mandi-amarelo Pimelodus maculatus Lacépède, 1803 (Siluriformes: Pimelodidae) and54 specimens of jundiá Rhamdia quelen (Quoy & Gaimard, 1824) (Siluriformes: Heptapteridae) were collected fromthe Paraíba do Sul River, Volta Redonda, State of Rio de Janeiro, Brazil between November 2007 and October 2008.These fish underwent necropsy so their infracommunities of metazoan parasites could be studied. The same threespecies of parasites were collected in the two fish species studied. These were one monogenean, one nematode, and onehirudinean. Cucullanus pinnai (Travassos, Artiga, and Pereira, 1928) (Nematoda: Cucullanidae) and Aphanoblastella sp.(Monogenea: Dactylogyridae) were the dominant species with the highest prevalence in P. maculatus and R. quelen.The parasite species of P. maculatus and R. quelen showed an atypical over-dispersed pattern of distribution. No parasitespecies showed significant correlation between the body total length of the siluriform hosts and their prevalence andabundance. The parasite species richness showed a mean value of 0.87 ± 0.67 (0 - 2) and 0.57 ± 0.56 (0 - 2) inP. maculatus and R. quelen, respectively, and no correlation with the body total length. (AU)

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From June 2001 to March 2004, 171 marine scombrid fishes (Perciformes: Scombridae) from the coastal zone of the State of Rio de Janeiro, Brazil (21-23 degrees S, 41-45 degrees W) were necropsied to study their community metazoan parasites: 46 Euthynnus alleteratus (Rafinesque, 1810); 15 Katsuwonus pelamis (Linnaeus, 1758); 30 Sarda sarda (Bloch, 1793) ; 43 Scomber scombrus Linnaeus, 1758 and 37 Scomberomorus brasiliensis Collette, Russo & Zavala-Camim, 1978. All specimens of E. alleteratus, K. pelamis and S. brasiliensis were parasitized by one or more metazoan species. In S. sarda and S. scombrus 96.7% and 60.4% of specimens were parasitized, respectively. Forty-four different metazoan parasites species were collected: 22 in E. alleteratus, 13 in K. pelamis, 14 in S. sarda, three in S. scombrus and 12 in S. brasiliensis. Euthynnus alleteratus is a new host record for 12 metazoan parasite species, K. pelamis and S. scombrus for one species each, S. sarda for eighth species and S. brasiliensis for five species. Nine parasites species were new geographical record. Fifteen species were common in at least two communities. The digeneans were the majority of the parasite specimens collected in E. alleteratus and S. brasiliensis with 85.7% and 72.5%, respectively. In K. pelamis and S. sarda the majority of the parasite specimens collected were cestodes and copepods, 64.5% and 62.9%, respectively. Only larval stages of nematodes were collected in S. scombrus. The parasite of 5 host species showed the typical aggregate pattern of distribution. Four cases of positive correlation and three cases of negative correlation between host's length and prevalence and parasite abundance were found. The parasite community of K. pelamis showed the higher values of the mean parasite species richness and diversity. Only in S. scombrus the abundance and parasite species richness were correlates with the host's length. Euthynnus alleteratus was the species with the higher number of ectoparasites (11), adult endoparasites (5) and larval stage of endoparasites (6). The infracommunities of larval stage of endoparasites showed correlation with the host's length and abundance, parasite species richness, diversity and numerical dominance.

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During May 2002 and January 2003, 65 specimens of pearl cichlid, Geophagus brasiliensis (Quoy & Gaimard, 1824), collected from the Lajes Reservoir, Rio de Janeiro, Brazil (22 degrees 42'-22 degrees 50'S, 43 degrees 53' -44 degrees 05'W), were necropsied to study their infracommunities of metazoan parasites. Fifty three fishes (81.5%) were parasitized by one or more metazoan. Six species of parasites were collected. The hirudinean Glossiphonid not identified was the majority (60%) of the parasite specimens collected and was the dominant species, with highest abundance and prevalence. The parasites of G. brasiliensis showed the typical aggregated pattern of distribution. No species of parasites of the pearl cichlid had correlation between the host's total length and parasite prevalence and abundance. The sex of hosts did not influence prevalence and abundance of any parasite species. The mean of Berger- Parker's index of dominance was 0.77 +/- 0.38. The mean species diversity in the infracommunities of G. brasiliensis was H = 0.154 +/- 0.06, with no correlation with the host's total length. The parasite community of G. brasiliensis from Lajes Reservoir is characterized by the low species richness and diversity.

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Sixty-six specimens of grey triggerfish Balistes capriscus Gmelin, 1788 and thirty specimens of queen triggerfish B. vetula Linnaeus, 1758 (Osteichthyes: Balistidae) collected from the coastal zone of the State of Rio de Janeiro (21-23 degrees S, 41-45 degrees W), Brazil, from April 2001 to May 2003, were necropsied to study their metazoan parasites. All fish were parasitized by at least one parasite species. Twenty-seven parasites species were collected: 22 in B. capriscus and 15 in B. vetula. Ten parasite species were common to the two host species. Balistes capriscus and B. vetula were a new host record for 16 and seven parasite species, respectively. Hypocreadium biminensis and Taeniacanthus balistae were recorded for the first time in Brazil. The copepod T. balistae and the nematode Contracaecum sp. were the dominant species with highest parasitic prevalence and abundance in the parasite community of B. capriscus and B. vetula, respectively. The metazoan parasites of B. capriscus and B. vetula showed typical aggregated pattern of distribution. The infracommunities of adult endoparasites showed highest values of mean abundance and parasite species richness. The parasite species richness, the total number of specimens and the mean Berger-Parker's index of the infracommunities of B. capriscus and B. vetula showed significant differences.

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A new species of Anoplodiscus (Monogenea, Anoplodiscidae), parasitic on gills of the red porgy, Pagrus pagrus, from the coastal zone of the State of Rio de Janeiro, Brazil, is described and illustrated. The new species can be differentiated from the other species of this genus by the shape of the accessory piece of the copulatory complex, and the length of the vagina. This is the first record of a species of Anoplodiscus in the Neotropical region

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Fifty-five specimens of pink cusk-eel, Genypterus brasiliensis Regan, 1903 (Osteichthyes: Ophidiidae) collected from the coastal zone of the State of Rio de Janeiro, Brazil (approx. 21-23 degrees S, 41-45 degrees W), from September 2000 to January 2001, were necropsied to study their parasites. All fish were parasitized by one or more metazoan. Fourteen species of parasites were collected. G. brasiliensis is a new host record for nine parasite species. The larval stages of cestodes and the nematodes were the majority of the parasite specimens collected, with 38.4% and 36.5%, respectively. Cucullanus genypteri was the dominant species with highest prevalence and/or abundance. The parasites of G. brasiliensis showed the typical overdispersed pattern of distribution. Six parasite species showed correlation between the host's total body length and prevalence and abundance. Host sex did not influence prevalence and parasite abundance of any parasite species. The mean diversity in the infracommunities of G. brasiliensis was H= 0.364 +/- 0.103, with correlation with the host's total length and without differences in relation to sex of the host. One pair of adult endoparasites (C. genypteri and A. brasiliensis) showed positive covariations between their abundances. Negative association or covariation was not found. Differences between the qualitative and quantitative aspects of the parasite community of G. brasiliensis from Rio de Janeiro and Argentina suggest the existence of two population stocks of pink cusk-eel in the South America Atlantic Ocean.

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Fifty-five specimens of pink cusk-eel, Genypterus brasiliensis Regan, 1903 (Osteichthyes: Ophidiidae) collected from the coastal zone of the State of Rio de Janeiro, Brazil (approx. 21-23°S, 41-45°W), from September 2000 to January 2001, were necropsied to study their parasites. All fish were parasitized by one or more metazoan. Fourteen species of parasites were collected. G. brasiliensis is a new host record for nine parasite species. The larval stages of cestodes and the nematodes were the majority of the parasite specimens collected, with 38.4 percent and 36.5 percent, respectively. Cucullanus genypteri was the dominant species with highest prevalence and/or abundance. The parasites of G. brasiliensis showed the typical overdispersed pattern of distribution. Six parasite species showed correlation between the host's total body length and prevalence and abundance. Host sex did not influence prevalence and parasite abundance of any parasite species. The mean diversity in the infracommunities of G. brasiliensis was H= 0.364 ± 0.103, with correlation with the host's total length and without differences in relation to sex of the host. One pair of adult endoparasites (C. genypteri and A. brasiliensis) showed positive covariations between their abundances. Negative association or covariation was not found. Differences between the qualitative and quantitative aspects of the parasite community of G. brasiliensis from Rio de Janeiro and Argentina suggest the existence of two population stocks of pink cusk-eel in the South America Atlantic Ocean

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A new species of Anoplodiscus (Monogenea, Anoplodiscidae), parasitic on gills of the red porgy, Pagrus pagrus, from the coastal zone of the State of Rio de Janeiro, Brazil, is described and illustrated. The new species can be differentiated from the other species of this genus by the shape of the accessory piece of the copulatory complex, and the length of the vagina. This is the first record of a species of Anoplodiscus in the Neotropical region.

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One hundred specimens of white croakers, Micropogonias furnieri (Desmarest 1823) (Osteichthyes: Sciaenidae) collected from Pedra de Guaratiba (23§01'S, 43§38'W), State of Rio de Janeiro, Brazil, from September 1997 to August 1999, were necropsied to study their parasites. The majority of the fish (95 percent) were parasitized by metazoan. Twenty-eight species of parasites were collected. The nematodes were the 40.5 percent of the total number of parasites specimens collected. Dichelyne elongatus was the most dominant species. Lobatostoma ringens, Pterinotrematoides mexicanum, Corynosoma australe, D. elongatus, and Caligus haemulonis showed a positive correlation between the host's total length and parasite prevalence and abundance. The monogenean P. mexicanum had differences in the prevalence and abundance in relation to sex of the host. The mean diversity in the infracommunities of M. furnieri was H=0.499 + or - 0.411, with correlation with the host's total length and without differences in relation to sex of the host. One pair of ectoparasites showed positive covariation, and two pairs of endoparasites showed positive association and covariation between their prevalences and abundances, respectively. Negative association or covariations were not found. The dominance of endoparasites in the croakers parasite infracommunities reinforced the differences found in sciaenids from the South American Pacific Ocean, in which the ectoparasites are dominant

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