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Registros recuperados: 34
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Abundância relativa e distribuição de Loricariichthys spixii (Steindachner) (Siluriformes, Loricariidae) no reservatório de Lajes, Estado do Rio de Janeiro, Brasil Zoologia
Duarte,Silvana; Araújo,Francisco Gerson.
The armored catfish Loricariichthys spixii (Steindachner, 1882) is the most abundant member of the Loricariidae family in the Lajes reservoir (22º42'-22º50'S 43º53' -44º05'W), the largest dam in the State of Rio de Janeiro State, but little is known about its biology and life cycle. A standardized fish sampling program in three zones of the reservoir (lower, middle and upper reaches), during three annual cycles: monthly in 1994/1996 and bi-monthly in 1997 was conducted out aiming to assess and add knowledge of the population structure of this species. Fishes were caught using gill nets (50 m long, 3 m depth and 25 to 45 mm meshes), amounting 160 samples. Water temperature, pH and transparency were registered at each sample to correlate with fish abundance....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lajes; Reservoir; Loricariidae; Distribution; Environmental parameters.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000200017
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Application of the physical habitat simulation for fish species to assess environmental flows in an Atlantic Forest Stream in South-eastern Brazil Neotropical Ichthyology
Costa,Marcus Rodrigues da; Mattos,Tailan Moretti; Fernandes,Victor Hugo; Martínez-Capel,Francisco; Muñoz-Mas,Rafael; Araújo,Francisco Gerson.
ABSTRACT The physical habitat simulation sub-routine of the Instream Flow Incremental Methodology (IFIM) uses hydraulic modeling and suitability indices of target fish species to predict how differences in-stream flows affect the microhabitat occupation by fish species. This habitat modelling approach was adopted to assess the ecological effects of running flows on three neotropical fish species of different orders (Bryconamericus ornaticeps , Ancistrus multispinis and Geophagus brasiliensis ).The study encompassed two reaches of an Atlantic Forest stream in Southeastern Brazil where topographic and hydraulic (depth, velocity and type of substrate) characteristics were measured to implement one-dimensional hydraulic simulation. Sub aquatic observation of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Habitat modeling; Habitat suitability curves; Neotropical fish.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400685
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Assessing of biotic integrity of the fish community in a heavily impacted segment of a tropical river in Brazil BABT
Pinto,Benjamin Carvalho Teixeira; Araújo,Francisco Gerson.
A index of biotic integrity (IBI) was applied to assess the ecological health at seven sites of ca. 338 km extension of the Paraíba do Sul river, in bracketing a large urban-industrial complex. The aim was to evaluate the index response to changes in environmental quality during two seasons (winter/dry versus. summer/wet). Eight metrics were selected to IBI in three categories: 1) species richness and habitat composition; 2) indicator species; and 3) trophic structure. The IBI, based on the least impacted regional condition, showed the highest value at the most upstream site (Queluz=km 0) - Acceptable, then decreasing downstream and reaching the lowest record at Volta Redonda (km 125) - Impacted; afterwards there was an increasing quality toward the most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish community; IBI; Environmental quality; Habitats; Tropical rivers; Biomonitoring.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300015
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Biologia reprodutiva dos bagres marinhos Genidens genidens (Valenciennes) e Cathorops spixii (Agassiz) (Siluriformes, Ariidae), na Baía de Sepetiba, Rio de Janeiro, Brasil Zoologia
Gomes,Iracema David; Araújo,Francisco Gerson; Azevêdo,Marcia Cristina Costa de; Pessanha,André Luiz Machado.
The reproductive cycle of the marine catfishes Genidens genidens Valenciennes, 1833 and Cathorops spixii Agassiz, 1839 in the Sepetiba Bay, was assessed by an annual period of sampling from October 1993 to September 1994. The fishes were caught by standardized otter trawl and environmental parameters of temperature, salinity and transparency of water were recorded at each sampling. Five gonadal phases were described, based in macroscopic observations. Changes in the gonadosomatic index (GSI) and in the percentual of stages of gonadal development showed that G. genidens spawns in Summer/early Autumn, coinciding with low salinity and high temperature and transparency. Cathorops spixii spawns in late Spring/early Summer, coinciding with rising temperature and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Siluriformes; Ariidae; Reproduction; Marine Catfish; Sepetiba Bay.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000600017
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Caracterização morfométrica da corvlna Micropogonias furnieri (Desmarest) (Pisces, Sciaenidae) na Baía de Sepetiba, Rio de Janeiro, Brasil Zoologia
Vicentini,Rafaela Nascimento; Araújo,Francisco Gerson.
The white croaker Micropogonias fumieri (Desmarest, 1823) is one of the most abundant fish species in the Sepetiba Bay, being heavily exploited in fisheries. Two hundred eleven fishes, captured from October 1998 to September 1999, in monthly samplings with otter trawling, were studied. The aim here is to characterize morphometrics of populations that use de Bay in order to compare with other areas. Measurements included standard length (SL), head length (HL), Pre-dorsal distance (PDD), pectoral distance (PD), ventral distance (VD) and anal distance (AD), pectoral length (PL) and eye diarneter (ED). The values of HL, PDD, PD, VD, AD, were related to SL, while ED was related to HL. Scatterplot from logaritrnized data, by sex, were analyzed in order to assess...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Morphometric; Sciaenidae; Coastal fishes; Bays; Sepetiba Bay.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000500010
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Composição das populações de linguados (Osteichthyes, Pleuronectiformes) da Baía de Sepetiba, Rio de Janeiro, Brasil Zoologia
Mendonça,Pablo; Araújo,Francisco Gerson.
Bi-monthly otter trawl sampling programme using a stratified random design was carried out at Sepetiba Bay (22º54'-23º04'S; 43º34'-44º10'W), from August 1994 to July 1996, aiming to assess the flatfish species composition and their relative abundance. Fourteen species in eight genera, four families and one suborder were identified. Paralichthyidae is the most diverse and abundant family, contributing to 70% of total number of individuals and to 58,8% of total biomass, being comprised of nine species: Etropus crossotus (Jordan & Gilbert, 1882); E. longimanus (Norman, 1933); Citharichthys spilopterus (Günther, 1862); C. arenaceus (Evermann & Marsh, 1902); C. macrops (Dresel, 1889); Paralichthys orbignyanus (Valenciennes, 1847); P....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Flatfish; Pleuronectiformes; Paralichthyidae; Sepetiba Bay.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000200005
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Dieta de juvenis de Trachinotus carolinus (Actinopterygii, Carangidae) em praias arenosas na costa do Rio de Janeiro Iheringia, Sér. Zool.
Niang,Tania Marcia S.; Pessanha,André Luiz M.; Araújo,Francisco Gerson.
Estudamos a dieta dos juvenis de Trachinotus carolinus (Linnaeus, 1766) em praias da Baía de Sepetiba (Rio de Janeiro, Brasil) entre janeiro de 2000 e abril de 2001. Procuramos avaliar a plasticidade trófica de peixes desta espécie ao longo de um gradiente espacial com diferentes níveis de exposição às ondas, sazonalidade, além de avaliar mudanças ontogenéticas na dieta. Os itens alimentares foram analisados através do índice de importância relativa (IIR), determinado pelos valores das frequências de ocorrência, de número e de peso. Os itens de maior importância foram do subfilo Crustacea, ordens Mysidacea, e o representante da ordem Decapoda Emerita brasiliensis (Schmitt, 1935), além de Cefalochordata, representado por Branchiostoma platae (Fitzinger,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Índice alimentar; Pampo; Peixes marinhos; Ontogenia trófica; Zona de arrebentação.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000100005
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Dieta do tucunaré-amarelo Cichla monoculus (Bloch & Schneider) (Osteichthyes, Cichlidae), no Reservatório de Lajes, Rio de Janeiro, Brasil Zoologia
Santos,Luciano Neves dos; Gonzalez,Alejandra Filippo; Araújo,Francisco Gerson.
The diet of Cichla monoculus (Bloch & Schneider, 1801) in Lajes's Reservoir, a major impoundment in Rio de Janeiro State, Brazil, was assessed, from fishes collected in 1994,1996 and 1999/2000. Gut contents in individuals was analyzed by the index of relative importance (IRI) which deals with numerical, gravimetrical and frequency of occurrence. Cichla monoculus showed a strong piscivorous habits feeding on Cichlidae, Characidae and Pimelodidae, in decreasing order of importance, with a remarkable cannibalism on young-of-the-year. Others minor items in the diet were Macrobrachium sp. and Odonata. Changes in feeding composition varied with reservoir's zones and seasons, with higher diversity in Autumn and peaks of cannibalism in lower zone during...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cichla; Trofic ecology; Diet; Reservoirs; Freshwater fish; Condition factor; Feeding habits.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000500015
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Distribuição, abundância relativa e movimentos sazonais de bagres marinhos (Siluriformes, Ariidae) no estuário da Lagoa dos Patos (RS), Brasil Zoologia
Araújo,Francisco Gerson.
Three ariid fish, Netuma barba, Netuma planifrons and Genidens genidens, use the estuary of the Patos Lagoon (32ºS), Rio Grande do Sul, Brazil, as a nursery and feeding ground in various stages of their life history. A comparative study was made of the temporal and spatial distribution and relative abundance. Seasonal movements were interpreted on the basis of distribution and abundance of the young of these coexisting sea catfishe. Monthly otter trawl samples were made between November, 1979 and April, 1983. Temperature, salinities and dissolved oxygen contents were taken at each of the 674 sample stations. All three species were caught in ample temperature (12,1 to 26,3ºC), salinity (0,3 to 35,5‰) and dissolved oxygen (4,7 to 11,5 mg/l) ranges. However,...
Tipo: Info:eu-repo/semantics/article
Ano: 1988 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751988000400002
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Distribuição e abundância relativa de bagres marinhos (Siluriformes, Ariidae) na Baía de Sepetiba, Rio de Janeiro Zoologia
Azevedo,Márcia Cristina Costa de; Araújo,Francisco Gerson; Cruz Filho,Antônio Gomes da; Santos,Alexandre Clístenes de Alcântara.
Marine catfish (Ariidae) are abundant resources in otter trawl fisheries carried out at Sepetiba Bay, Rio de Janeiro (Lat. 22º54, 23º04'S; Long. 43º34\ 44º10'W). Relative abundance and distribution were assessed, based in 158 fishing sampling at seven sites in the Bay, between July-1993 e June-1996. Five species were recorded in the following abundance rank order: Genidens genidens (Valenciennes, 1839), Caihorops spixii (Agassiz,1829), Sciadeichthys lunisculis (Valenciennes, 1840), Nelunia barba (Lacépède, 1803), and Bagre marinus (Mitchill, 1814), the latter have been caught in only two samples. Marine catfish showed higher abundance in the inner Bay, with indication of spatial segregation. G genidens was abundant in ali sites of lhe inner Bay, C. spixii...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Siluriformes; Ariidae; Fish ecology; Marine catfish; Sepetiba Bay.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000400003
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Distribuição e abundância relativa de cumbaca Trachelyopterus striatulus Steindachner (Osteichthyes, Auchenipteridae) no reservatório de Lajes, Rio de Janeiro, Brasil Zoologia
Duarte,Silvana; Caetano,Carla de Brito; Vicentini,Rafaela Nascimento; Araújo,Francisco Gerson.
The catfish Trachelyopterus striatulus Steindachner, 1877 is a very abundant fish species in reservoirs in Southeast Brazil, and its relative abundance seems to be increasing in several lentic environments. Despite of being a very common species, few information is available on its distribution and other aspects of ecology. The Lajes reservoir (22º42'-22º50'S e 43º53'-44º05'W) is the largest manmade lake for hydropower purposes in Rio de Janeiro State, where this species rank among the top abundant fishes, both in number and in biomass. Its relative abundance were compared in three zones of the reservoir (upper, central and lower), based on a standardized program, during three annual periods (monthly sampling in 1994 and bi-monthly sampling in 1996 and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Auchenipteridae; Distribution; Abundance; Environmental parameters; Lajes; Reservoir.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300029
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Ecomorphology and resource use by dominant species of tropical estuarine juvenile fishes Neotropical Ichthyology
Pessanha,André Luiz Machado; Araújo,Francisco Gerson; Oliveira,Ronnie Enderson M. C. C.; Silva,Adna Ferreira da; Sales,Natalice Santos.
Eleven ecomorphological attributes and diet of seventeen juvenile fish species were examined to test the hypothesis that morphological patterns determine resource uses in estuarine habitats. Species were separated according to the apparatus to food capture and habitat use (benthic or pelagic) in three different groups: (1) a group with depressed fish body, strong caudal peduncle and enlarged pectoral fins; (2) a second group laterally flattened with a wide protruding mouth, and (3) a third group strongly flattened with small pectorals fins. The following six trophic groups were organized based on prey categories: Zooplanktivores, Benthivores, Omnivores, Detritivores, Macrocarnivores and Insectivores. Significant results (PERMANOVA) between ecomorphological...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diets; Estuary; Habitats; Morphology; Resource partitioning.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200401
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Efeito do grau de exposição às ondas sobre a comunidade de peixes juvenis em praias arenosas do Município do Rio de Janeiro, Brasil Biota Neotropica
Vasconcellos,Ruan Managna; Santos,Joaquim Neto de Sousa; Silva,Márcio de Araújo; Araújo,Francisco Gerson.
A distribuição e abundância da ictiofauna na zona de arrebentação de praias arenosas do Município do Rio de Janeiro, Brasil, foram estudadas objetivando detectar variações sazonais ou influências do grau de exposição na estrutura da comunidade de peixes jovens. Amostras trimestrais foram realizadas em 10 praias sendo agrupadas de acordo com o nível de exposição (abrigada, exposta e muito exposta), entre Janeiro e Novembro de 2004, com os arrastos tendo sido efetuados perpendiculares à linha de costa. Foram registrados 6.464 peixes, distribuídos em 38 espécies e 22 famílias, com o predomínio de formas juvenis ou de pequeno porte. As famílias Clupeidae, Carangidae e Sciaenidae representaram 79% do número total de indivíduos e 61% da biomassa total. As...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Praia arenosa; Zona de arrebentação; Peixe; Ictiofauna; Rio de Janeiro.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000100013
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Effects of the proximity from an industrial plant on fish assemblages in the rio Paraíba do Sul, southeastern Brazil Neotropical Ichthyology
Pinto,Benjamin Carvalho Teixeira; Peixoto,Magna Galvão; Araújo,Francisco Gerson.
This work aims to analyze changes in the fish assemblages along a longitudinal reaches of the rio Paraíba do Sul, one of the most used Brazilian aquatic systems, to assess the river "health" and to identify eventual recovery trends. Standardized monthly samplings were carried out at six sites, from October 1997 to September 1999, using casting, sieves, seine and gill nets. Three zones were searched: upstream (Z I), downstream (Z III) and nearby the source of pollution (Z II). Three univariate distribution methods were used: ABC (abundance-biomass curves), K-dominance curves, and geometric class's distribution. Additionally, cluster analysis was applied to detect eventual patterns. The ABC and K-dominance curves showed Z II with evident indication of stress...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish community; Neotropical fauna; Pollution; Water quality; ABC curves; Cluster analysis.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200013
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Enzymatic Activity in the Gastrointestinal Tract of Pimelodus maculatus (Teleostei, Siluriformes) in Two Neotropical Reservoirs with Different Trophic Conditions BABT
Duarte,Silvana; Bemquerer,Marcelo; Araújo,Francisco Gerson.
Enzymatic activities for digestion of proteins and carbohydrates were compared among three organs of the digestive system of Pimelodus maculatus in two reservoirs with different trophic conditions during the winter of 2006. The aim was to test the hypothesis that enzymatic activity for the digestion of proteins and carbohydrates differed among organs and that such activities differ between the trophic state of the environment. Enzymatic activities were determined through the assays of specificity for trypsin, chymotrypsin and β-glucosidase enzymes. The intestine had higher trypsin-like enzymatic activities compared to the stomach and liver. The highest β-glucosidase activity was found in the liver compared to the stomach and intestine in the oligotrophic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Enzymes; Catfish; Physiology; Freshwater fishes; Digestive tract.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000400605
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Estratégia trófica dos linguados Citharichthys spilopterus Günther e Symphurus tessellatus (Quoy & Gaimard) (Actinopterygii, Pleuronectiformes) na Baía de Sepetiba, Rio de Janeiro, Brasil Zoologia
Guedes,Ana Paula Penha; Araújo,Francisco Gerson; Azevedo,Márcia Cristina Costa de.
O objetivo deste estudo foi determinar as mudanças espaciais e ontogenéticas na dieta dos linguados Citharichthys spilopterus Günther, 1862 e Symphurus tessellatus (Quoy &amp; Gaimard, 1824) na Baía de Sepetiba. A área de estudos foi dividida em três zonas (interna, central e externa), onde foram realizados arrastos de fundo diurnos no período entre outubro/1998 a setembro/1999. C. spilopterus apresentou os maiores Índices de Importância Relativa (IIR) para Mysidacea (0.3359) e Amphipoda (0.0805), enquanto S. tessellatus apresentou maiores IIR para Amphipoda (0.7515) e Polychaeta (0.2586). A elevada porcentagem (67,61%) de estômagos vazios em S. tessellatus sugere atividade alimentar noturna. Os espécimes de menor tamanho (CT < 115 mm) de C....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Baías; Dieta; Hábitos alimentares; Peixes de fundo.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000400020
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Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir Neotropical Ichthyology
Terra,Bianca de Freitas; Santos,Alex Braz Iacone dos; Araújo,Francisco Gerson.
We analysed changes in the fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil Reservoir. We tested the hypothesis that shifts from lotic to lentic environment affect the richness and structure of the assemblage which are modulated by seasonal rainfall changes. Standardised monthly samplings were carried out from October 2006 to September 2007 in four zones: 1) river upstream from the reservoir; 2) upper part of the reservoir; 3) lower part of the reservoir, and 4) river downstream from the reservoir. Fishes were caught using gillnets deployed for 15 hours. We collected a total of 4550 specimens, representing 35 species and 5 orders. The highest richness and diversity were recorded in zone 2, the transitional zone...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spatial patterns; Physico-chemical variables; Reservoirs.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300004
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Gram-negative intestinal indigenous microbiota from two Siluriform fishes in a tropical reservoir BJM
Duarte,Silvana; Silva,Flávia Cristina de Paula e; Zauli,Danielle Alves Gomes; Nicoli,Jacques Robert; Araújo,Francisco Gerson.
The Gram-negative intestinal microbiota of Hypostomus auroguttatus and Pimelodus maculatus, a detritivorous and an omnivorous fish species, respectively, were compared between fishes from the reservoir and the stretch of the river below the dam of the Funil hydroelectric plant, Rio de Janeiro, Brazil. Four selective culture media were used under aerobic and two under anaerobic conditions. The omnivorous species had microbiota with higher population levels compared to the detritivorous species. The number of morphotypes and population levels of total bacteria, vibrio and Bacteroides tended to be higher in summer and autumn in the reservoir, and not different in the river. The number of morphotypes of enterobacteria and total bacteria were higher in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alimentary regimen; Environment; Gut microbiology; Hypostomus auroguttatus; Pimelodus maculatus.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400019
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Habitat preferences of common native fishes in a tropical river in Southeastern Brazil Neotropical Ichthyology
Costa,Marcus Rodrigues da; Mattos,Tailan Moretti; Borges,Joyce Liz; Araújo,Francisco Gerson.
We determined in this study the habitat preferences of seven native fish species in a regulated river in Southeastern Brazil. We tested the hypothesis that fishes differ in habitat preference and that they use stretches of the river differing in hydraulic characteristics and substrate type. We surveyed fishes in four 1-km long river stretches encompassing different habitat traits, where we also measured water depth, velocity, and substrate type. We investigated preference patterns of four Siluriformes (Loricariichthys castaneus, Hoplosternum littorale, Pimelodus maculatus, and Trachelyopterus striatulus) and three Characiformes (Astyanax aff. bimaculatus, Oligosarcus hepsetus, and Hoplias malabaricus), representing approximately 70% of the total number of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ecological flow; Freshwater fishes; Habitat guild; River flow.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400871
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Indicadores reprodutivos de Parauchenipterus striatulus (Steindachner) (Pisces, Auchenipteridae) na Represa de Ribeirão das Lajes, Rio de Janeiro, Brasil Zoologia
Araújo,Francisco Gerson; Duarte,Silvana; Goldberg,Rubens Sterental; Fichberg,Liana.
Parauchenipterus striatulus is a representative of the freshwater catfish with wide distribution in the South America region. Despite of being a very abundant fish in rivers and reservoirs of this region, little is known about its biology and ecology. In Ribeirão das Lajes reservoir (22º42'S - 22º50'S, 43º53'- 44º05' W, Rio de Janeiro), the Rio de Janeiro state's largest hydroelectric reservoir, this species is very abundant, representing about 40% of the total experimental fish catches using gill nets. This paper aims to assess aspects of the reproductive cycle of this species describing the gonadal stages, gonadosomatic index, weight-length relationship and condition factor. Fish sampling were carried out bi-monthly, between April 1996 and May 1997. Gill...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Auchenipteridae; Length-weight relationship; Reproduction; Condition factor; Gonadosomatic index; Reservoir.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400016
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