Consulta: creatorFacets:"Araújo,Francisco Gerson"
Registros recuperados: 34
Data/hora: 10/06/2024 14:08:03

Dieta de juvenis de Trachinotus carolinus (Actinopterygii, Carangidae) em praias arenosas na costa do Rio de Janeiro
Provedor de dados: 76
Autores: 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

Habitat preferences of common native fishes in a tropical river in Southeastern Brazil
Provedor de dados: 83
Autores: 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

Water level influences on body condition of Geophagus brasiliensis (Perciformes: Cichlidae) in a Brazilian oligotrophic reservoir
Provedor de dados: 83
Autores: Santos,Alejandra Filippo Gonzalez Neves dos; Santos,Luciano Neves dos; Araújo,Francisco Gerson.
Effects of water level fluctuations on body condition of Geophagus brasiliensis were studied in a 30 km² Brazilian oligotrophic reservoir. Physiological condition (K) and gonadosomatic index (GSI) were compared according to water level (low and high). Females' best conditions were associated to higher resources availability during high water, since gonad development did not change between low and high water. Males' condition did not change between water levels, while the highest gonad development occurred in low water. Females presented higher reproductive investment than males, which allocated most of energy for somatic development. This strategy could be a mechanism to undergo the stress caused by oligotrophic characteristics of the reservoir enhanced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental variables; Condition factor; Gonadosomatic index; Mass-length relationship; Impoundment.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000300007

Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir
Provedor de dados: 83
Autores: 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

Ecomorphology and resource use by dominant species of tropical estuarine juvenile fishes
Provedor de dados: 83
Autores: 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

Effects of the proximity from an industrial plant on fish assemblages in the rio Paraíba do Sul, southeastern Brazil
Provedor de dados: 83
Autores: 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

Application of the physical habitat simulation for fish species to assess environmental flows in an Atlantic Forest Stream in South-eastern Brazil
Provedor de dados: 83
Autores: 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

Influence of the river flow on the structure of fish assemblage along the longitudinal gradient from river to reservoir
Provedor de dados: 103
Autores: Santos,Alex Braz Iacone; Terra,Bianca de Freitas; Araújo,Francisco Gerson.
Changes in fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil reservoir were studied to detect distribution patterns and the seasonal influence of the inflowing river. Fish were caught by gill nets in three zones (riverine, transition and lentic) during two seasons (dry and wet). A total of 3,721 individuals were captured, comprising five orders, 14 families, 27 genera and 33 species. Five species were non-native and amounted to 17.7% of the total number of individuals. The 10 most abundant species were used to assess spatial-temporal patterns. Plagioscion squamosissimus (Heckel, 1840), Oligosarcus hepsetus (Curvier, 1829) and Metynnis maculatus (Kner, 1858) were widely distributed in both seasons. Astyanax...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dam; Fish diversity; Paraíba do Sul River; Seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500010

Reproductive plasticity of Hypostomus affinis (Siluriformes: Loricariidae) as a mechanism to adapt to a reservoir with poor habitat complexity
Provedor de dados: 103
Autores: Duarte,Silvana; Araújo,Francisco Gerson; Bazzoli,Nilo.
In this work we describe the gonad morphology and spawning season of Hypostomus affinis (Steindachner, 1877) in a tropical reservoir based on 55 males and 125 females. Our aim was to assess eventual adaptations in reproductive tactics developed by this riverine species inhabiting an oligotrophic reservoir with low habitat complexity, few rocks and few other preferred consolidated substrata. We described the stages of cells of reproductive lineage, gonadal development and some reproductive traits which were compared with information in the available literature. Cells from the spermatogenic lineage were spermatogonia, spermatocytes, spermatids and spermatozoa, and cells from the oocytarian lineage were primary oocytes, previtelogenic oocytes, cortical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Fish reproduction; Reproductive biology; Reservoirs; Tactics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500005

Influence of season, environment and feeding habits on the enzymatic activity of peptidase and β-glucosidase in the gastrointestinal tract of two Siluriformes fishes (Teleostei)
Provedor de dados: 103
Autores: Duarte,Silvana; Paiva,Marco A. R.; Lara,Camila C.; Bemquerer,Marcelo P.; Araújo,Francisco Gerson.
The enzymatic activities involved in the digestion of proteins and carbohydrates were compared among three organs of the digestive track of two Siluriformes fish species, and between two areas: a reservoir, and an area downriver of it. Our aim was to test the hypothesis that the digestive organs of species with varied feeding habits have different enzymatic activities, and that the enzymatic activity differs among seasons and environmental conditions. The iliophagous/herbivorous species Hypostomus auroguttatus Kner, 1854 had higher trypsin-like, chymotrypsin-like peptidase and β-glucosidase activity in the intestine when compared with the omnivorous species Pimelodus maculatus Lacepède, 1803, whereas the latter had more hepatic trypsin-like activity than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzymatic activity; Fishes; Physiology; Reservoirs; Siluriformes; Peptidases; Β-glucosidase.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000300006

Occurrence of phoresy between Ancistrus multispinis (Actinopterygii: Siluriformes) and Ichthyocladius sp. (Diptera: Chironomidae) in Atlantic forest streams, Southeastern Brazil
Provedor de dados: 103
Autores: Mattos,Tailan Moretti; Carvalho,Dandhara Rossi; Brito,Mateus Santos de; Araújo,Francisco Gerson.
ABSTRACT Phoretic relationships often bring large advantages to epibionts. By attaching themselves to mobile hosts, epibionts are able to: expand their ranges without spending energy, reduce their risk of being predated, and increase their probability of finding food. We assessed the phoretic relationship between the siluriform fish Ancistrus multispinis (Regan, 1912) and the chironomid larva Ichthyocladius sp. in three streams of the Atlantic forest in southeastern Brazil. We evaluated changes in epibiont distribution throughout the body regions of the host and among three different aquatic systems. We had predicted that certain body regions are more prone to support epibiont attachment, and that epibiont prevalence increases with increased host size and...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Commensalism; Larval dispersion; Midges; Stream ecology.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100503

Recrutamento do peixe-rei, Atherinella brasiliensis (Quoy &amp;amp; Gaimard) (Atheriniformes, Atherinopsidae), na margem continental da Baía de Sepetiba, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: Pessanha,André Luiz Machado; Araújo,Francisco Gerson.
The silverside, Atherinella brasiliensis (Quoy &amp;amp; Gaimard, 1824), a resident species of the shallows of bays, estuaries and coastal lagoons, was studied during two annual cycles, using beach seines (July 1996 to June 1998), in the continental margin of the Sepetiba Bay, aiming to assess recruitment and distribution patterns. A wide recruitment period, with young-of-the-year appearing from early spring to early autumn, was shown, with peaks of juveniles (Total Length-LT = 10-30 mm) being recorded in two periods of the year; one in November and another in March. The highest abundances, of both juvenile and adults, were recorded in Coroa Grande and Itacuruçá, sites located in the outer Bay, during the whole summer, with significant differences were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atherinopsidae; Silverside; Distribuition; Sepetiba Bay.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400021

Length-weight relationship and condition factor of Micropogonias furnieri (Desmarest) (Perciformes, Sciaenidae) in the Sepetiba Bay, Rio de Janeiro State, Brazil
Provedor de dados: 104
Autores: Costa,Marcus Rodrigues da; Araújo,Francisco Gerson.
The length-weight relationship and spatial, temporal and ontogenetic changes in the condition factor of Micropogonias furnieri (Desmarest, 1823) were analyzed, from samples collected between October 1998 and September 1999, in the Sepetiba Bay, a coastal area with a wide communication with the sea (22º54'-23º04'S, 43º34'-44º10'W) at Southeast Brazil. The aim was to supply basic information on the form of growth of the population of M. furnieri that uses the bay, as well as to assess changes in the fish condition. Most fish were young and subadults. The length-weight equation, based on 2499 unsexed individuals, was Wt = 0.009095 * Lt2.99, where Wt is the total weight (g) and Lt is the total length (cm). The regression constant and the regression coefficient...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal fish; Fish occurence; Ichthyofauna; Tropics; White croaker.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000400022

Biologia reprodutiva dos bagres marinhos Genidens genidens (Valenciennes) e Cathorops spixii (Agassiz) (Siluriformes, Ariidae), na Baía de Sepetiba, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: 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

Relação peso-comprimento da corvina Micropogonias furnieri (Desmarest) (Pisces, Sciaenidae) na Baía de Sepetiba, Rio de Janeiro
Provedor de dados: 104
Autores: Araújo,Francisco Gerson; Vicentini,Rafaela Nascimento.
The length-weight relationship of populations of white croaker Micropogonias furnieri (Desmarest, 1823) in the Sepetiba Bay (22º54'-23º04'S; 43º34'-44º10'W), were assessed. It aims to contribute to the knowledge of the biometrics and to estimate the biomass of this very abundant fishery resource in the Bay. Fishes sampled, in both trawling beach seine, sampling programme, from October 1998 to May 1999 were analyzed. The equation found was W = 0.00000942 L2.99 fom the natural logaritmized transformation of the raw data, through ordinary least square equation = In W = -11.57 + 2.996 In L (r=0.99). The condition factor was relatively high compared with coastal population from Southeast Brazil, probably due to in this study both males and females from juvenile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seiaenidae; Length-weight relationship; Coastal fishes; Bays; Sepetiba Bay.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000100014

Variações espaciais na assembléia de peixes no Rio Paraíba do Sul (Barra Mansa, Barra do Piraí), Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: Araújo,Francisco Gerson; Fichberg,Ilana; Pinto,Benjamin Carvalho Teixeira; Peixoto,Magna Galvão.
The Paraíba do Sul is a major running water system in southeastern Brazil (22º24' -22º26'S; 43º43' -44º16' W), draining one of the most important industrial regions in the country. Because of its location, it has suffered a large amount of alteration due to discharges of urban and industrial effluents with direct influence in the ichthyofauna. The aim of this study is to up-to-date information on fish assemblage structure and its variation in the vicinity of a major industrial effluent outfall at Volta Redonda industrial complex. A standardized fishing sampling program, using seines, casting nets, gill nets and net trays, was carried out from October 1997 to September 1999, at six sites in three zones of the river (upstream, nearby and downstream the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rivers; Fish taxocenose; Pollution; Ichthyofauna; Fish ecology.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000200019

Caracterização morfométrica da corvlna Micropogonias furnieri (Desmarest) (Pisces, Sciaenidae) na Baía de Sepetiba, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: 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

Distribuição e abundância relativa de bagres marinhos (Siluriformes, Ariidae) na Baía de Sepetiba, Rio de Janeiro
Provedor de dados: 104
Autores: 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

Composição das populações de linguados (Osteichthyes, Pleuronectiformes) da Baía de Sepetiba, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: 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 &amp;amp; Gilbert, 1882); E. longimanus (Norman, 1933); Citharichthys spilopterus (Günther, 1862); C. arenaceus (Evermann &amp;amp; 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

Distribuição e abundância relativa de cumbaca Trachelyopterus striatulus Steindachner (Osteichthyes, Auchenipteridae) no reservatório de Lajes, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: 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

Dieta do tucunaré-amarelo Cichla monoculus (Bloch &amp;amp; Schneider) (Osteichthyes, Cichlidae), no Reservatório de Lajes, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: Santos,Luciano Neves dos; Gonzalez,Alejandra Filippo; Araújo,Francisco Gerson.
The diet of Cichla monoculus (Bloch &amp;amp; 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

Indicadores reprodutivos de Parauchenipterus striatulus (Steindachner) (Pisces, Auchenipteridae) na Represa de Ribeirão das Lajes, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: 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

Estratégia trófica dos linguados Citharichthys spilopterus Günther e Symphurus tessellatus (Quoy &amp;amp; Gaimard) (Actinopterygii, Pleuronectiformes) na Baía de Sepetiba, Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: 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;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 &lt; 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

Distribuição, abundância relativa e movimentos sazonais de bagres marinhos (Siluriformes, Ariidae) no estuário da Lagoa dos Patos (RS), Brasil
Provedor de dados: 104
Autores: 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

Variações temporais e espaciais na composição e estrutura da comunidade de peixes jovens da Baía de Sepetiba, Rio de Janeiro
Provedor de dados: 104
Autores: Pessanha,André Luiz Machado; Araújo,Francisco Gerson; Azevedo,Márcia Cristina Costa de; Gomes,Iracema David.
A year-long beach seine survey at the continental margin of Sepetiba Bay, Rio de Janeiro State, Brazil, catching mainly young-of-the-year and juvenile fishes was carried out from July 1983 to June 1984, in order to describe the community structure and their spatial and seasonal variations. Fifty-five monthly samplied carried out in five sites in the marginal surf zone waters yielded 11,463 fishes in 82 species, 59 genera and 31 families. Gerreidae, Engraulidi-dae, Atherinidae and Ariidae families amounted 87.01% of the total catch in number, and 81% in weight. Cerres aprion Cuvier, 1829, Anchoa januaria (Steindachner, 1879), Anchoviella lepidentostole (Fowler, 1911), Atherinella brasiliensis (Quoy &amp;amp; Gaimard, 1824) and Neluma barba (Lacépède, 1803)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sepetiba Bay; Ichthyofauna; Fish; Bioecology.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000100022

Abundância relativa e distribuição de Loricariichthys spixii (Steindachner) (Siluriformes, Loricariidae) no reservatório de Lajes, Estado do Rio de Janeiro, Brasil
Provedor de dados: 104
Autores: 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

Influência das variáveis ambientais na fauna acompanhante na pesca da manjuba Anchoa tricolor (Agassiz) (Actinopterygii, Engraulidae) na Baía de Sepetiba, Rio de Janeiro
Provedor de dados: 104
Autores: Silva,Márcio de Araújo; Araújo,Francisco Gerson.
Anchoa tricolor (Agassiz, 1829) is the only anchovy of commercial importance in Sepetiba Bay, supporting an intensive commercial fishery by small sized seine boats provide of hydroacustics sounder detecting device. This study analyses the accompanying fauna in the A. tricolor fishery, and the influence of environmental parameters in fish composition. Seven samples were taken with a seine net between March and September 1999, capturing 114,430 fish, comprising 17 species and 11 families. Engraulidae and Clupeidae were the most abundant families, accounting to 94.2 % of the total number of fish. A. tricolor was the most abundant species contributing to more than one half of the total numerical abundance, followed in decreasing order by Anchoa januaria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anchoa tricolor; Engraulidae; Pelagic fishes; Sepetiba Bay.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000300001

Size-related and seasonal changes in the diet of the non-native Cichla kelberi Kullander &amp;amp; Ferreira, 2006 in a lowland reservoir in the southeastern Brazil
Provedor de dados: 49
Autores: Mendonça,Helaine Silva; Santos,Alexandre Clistenes Alcântara; Martins,Mariana Marques; Araújo,Francisco Gerson.
Abstract: We examined size-related and seasonal changes in the diet of the peacock bass Cichla kelberi in a tropical lowland reservoir in southeastern Brazil over three hydro-climatic seasons: summer (high rainfall and temperature), winter (low rainfall and temperature), and late spring (increasing rainfall and temperature) during two years (2006-2007). The tested hypothesis is that this non-native predator fish changes diet during the subadult and adult phases and among seasons to adapt in new colonized environment. Fishes of the families Clupeidae (Platanichthys platana), Characidae (Astyanax spp.) and Cichlidae (Cichla kelberi) were the most important food items, followed by insects of the order Odonata. Cannibalism was also recorded for the largest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding ecology; Freshwater fishes; Non-native species; Piscivory; Impoundment.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000300207

Efeito do grau de exposição às ondas sobre a comunidade de peixes juvenis em praias arenosas do Município do Rio de Janeiro, Brasil
Provedor de dados: 49
Autores: 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

Uso da taxocenose de peixes como indicadora de degradação ambiental no rio Paraíba do Sul, Rio de Janeiro, Brasil
Provedor de dados: 52
Autores: Araújo,Francisco Gerson.
An adaptation of index of biotic integrity (IBI) was performed for the first time in Brazil at the Rio Paraíba do Sul, between Barra Mansa and Barra do Piraí, a very important extent of this river because of the high pollution levels, and for being the main abstraction source of Rio de Janeiro city water supply. A monthly standardised sampling programme, from March-1995 to February-1996, was carried out at four sites. Seines, casting nets and net trays were used for catching fishes. IBI was obtained by integrating 12 ecological and environmental attributes of fish taxocene, populations, and individual organisms to assess biological integrity based in Species Composition, Trophic Structure and Fish Condition. Overall, water quality was classified between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rio Paraíba do Sul; Integridade Biótica; Peixes; Poluição.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000300016

Enzymatic Activity in the Gastrointestinal Tract of Pimelodus maculatus (Teleostei, Siluriformes) in Two Neotropical Reservoirs with Different Trophic Conditions
Provedor de dados: 52
Autores: 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

Morphology of gonads, maturity and spawning season of Loricariichthys spixii (Siluriformes, Loricariidae) in a Subtropical Reservoir
Provedor de dados: 52
Autores: Duarte,Silvana; Araújo,Francisco Gerson; Sales,Armando; Bazzoli,Nilo.
The gonad morphology and spawning season of Loricariichthys spixii in Lajes reservoir were described based on 175 males and 613 females. Cells from the spermatogenic lineage were divided in four phases: spermatogonia (primary and secondary), spermatocytes (primary and secondary), spermatids and spermatozoa, and the cells from the ovocitarian lineage were divided in four phases: primary oocytes (O1), previtellogenic oocytes (O2), cortical vesicle oocytes (O3) and yolk globules or vitellogenic (O4). Five gonadal stages were described for the males/females according to oocytes and spermatogenic lineage cells distribution: resting (1); initial maturation (2a); advanced maturation (2b); partially spent/spawned (4a); totally spent/spawned (4b). Spawning was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Loricariidae; Reservoir; Fish reproduction; Gonad morphology; Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000700013

Assessing of biotic integrity of the fish community in a heavily impacted segment of a tropical river in Brazil
Provedor de dados: 52
Autores: 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

Gram-negative intestinal indigenous microbiota from two Siluriform fishes in a tropical reservoir
Provedor de dados: 58
Autores: 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