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Registros recuperados: 18
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A barrier to upstream migration in the fish passage of Itaipu Dam (Canal da Piracema), Paraná River basin Neotropical Ichthyology
Fontes Júnior,Hélio Martins; Castro-Santos,Theodore; Makrakis,Sergio; Gomes,Luiz Carlos; Latini,João Dirço.
The majority of the fish passages built in the Neotropical region are characterised by low efficiency and high selectivity; in many cases, the benefits to fish populations are uncertain. Studies conducted in the Canal da Piracema at Itaipu dam on the Parana River indicate that the system component designated as the Discharge channel in the Bela Vista River (herein named Canal de deságue no rio Bela Vista or CABV), a 200 m long technical section, was the main barrier to the upstream migration. The aim of this study was to evaluate the degree of restriction imposed by the CABV on upstream movements of Prochilodus lineatus and Leporinus elongatus, Characiformes. Fish were tagged with passive integrated transponders (PIT tags) and released both downstream and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish migration; Nature-like; Neotropical fishes; PIT-tag; Telemetry.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400002
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Age and growth of Hypophthalmus edentatus (Spix), (Siluriformes, Hypophthalmidae) in the Itaipu Reservoir, Paraná, Brazil Zoologia
Ambrósio,Ângela Maria; Gomes,Luiz Carlos; Agostinho,Ângelo Antônio.
Age and growth of Hypophthalmus edentatus (Spix, 1829) (Siluriformes, Hypophthalmidae) was determined. Data were collected from December 1983 to November 1984 and from April 1997 to March 1998 in the Itaipu Reservoir. To evaluate reading consistency, it was analyzed the coefficient of variation of the total length for each annulus observed in the otoliths. Through marginal increment analysis, it was determined that the annuli formed annually (April) indicating that otoliths may be used in the study of age and growth of the species. Food supply was considered the main factor affecting growth and annuli formation in both periods. Back-calculated data were used to assess if the Rosa Lee phenomenon, commom in selective samples like commercial fishing, occured....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age; Growth; Hypophthalmus edentatus; Itaipu Reservoir; Otoliths.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000200002
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Age, growth, mortality and yield per recruit of the dourado Salminus brasiliensis, Corumbá Reservoir, Goiás State, Brazil Neotropical Ichthyology
Tos,Claudenice Dei; Gomes,Luiz Carlos; Agostinho,Angelo Antônio; Batista,Rosana Paulo.
In order to evaluate the fate of the migratory species dourado Salminus brasiliensis in the first years of impoundment in Corumbá Reservoir we estimated age, growth, mortality and yield per recruit. Samplings were carried out monthly in Corumbá Reservoir and its main tributaries (Goiás State) from March 1998 to February 1999 using gillnets. After one year of impoundment, age was estimated from scales and the maximum number of rings was six for males and five for females. Rings are formed annually in May and June. The asymptotic length and growth rate for males and females were 37.1 cm and 0.77 and 56.6 cm and 0.52, respectively. A dominance of juveniles was verified in the reservoir and its tributaries. The instantaneous total mortality rate (Z) was 1.59...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Growth model; Mortality; Fishery yield; Dam; Characidae.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200014
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Diet of a catfish before and after damming of the salto caxias reservoir, iguaçu river BABT
Delariva,Rosilene Luciana; Hahn,Norma Segatti; Gomes,Luiz Carlos.
This study evaluated the diet of Pimelodus sp., before and after damming of Salto Caxias, (waterfall in the Iguaçu river), as well spatial and ontogenetic diet shift. Surveys were carried out from March 1997 to February 1998 (before damming) and from April 1999 to January 2000 (after damming) inside the reservoir and adjacent tributaries. Stomach contents analysis of 682 specimens revealed omnivory with high degree of trophic opportunism to this species. Analysis of variance (three way ANOVA) for scores produced from Detrended Correspondence Analysis (DCA) yielded a significant interaction between the damming phases and size of the individuals (juveniles and adults) (F = 4.68; P = 0.04). After damming, adults exploited mainly fish, whereas the juveniles...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Catfish; Diet; Trophic opportunism; Reservoir.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000500004
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Diet of Iheringichthys labrosus (Pimelodidae, Siluriformes) in the Itaipu Reservoir, Paraná River, Brazil-Paraguay BABT
Abes,Sara da Silva; Agostinho,Angelo Antonio; Okada,Edson Kiyoshi; Gomes,Luiz Carlos.
Iheringichthys labrosus is a secondary commercial fish species in the Itaipu Reservoir, but it is important in other reservoirs of the basin. However, little information exists about this species in the literature. The purpose of this study was to describe the diet of this species in the Itaipu Reservoir. Stomachs of 306 fishes were analyzed, collected from October 1994 to September 1996 in the differents zones of the reservoir (according to a longitudinal gradient). The reservoir was separated into riverine (upper reach), transitional (middle reach), and lacustrine (next to the dam) zones. Main items in the diet of I. labrosus were aquatic insects (mainly Chironomidae) and mollusks (mainly Bivalvia). Their presence in the diet did not vary according to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Itaipu Reservoir; Freshwater; Fish; Feeding; Diet composition; Benthophagous.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000100014
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Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Paraná River floodplain Neotropical Ichthyology
Petry,Ana Cristina; Abujanra,Fabiane; Gomes,Luiz Carlos; Julio Jr.,Horácio Ferreira; Agostinho,Angelo Antonio.
The effects of the duration of the floods on abiotic variables and attributes of species tolerant and intolerant to hypoxia (STH and SIH respectively) were evaluated in rivers and lakes of the upper Paraná River. Fish were sampled once a year, in six sampling stations, during the high water period from 2000 to 2003. There were overall reductions in dissolved oxygen levels and increases in transparency of water in lakes in years of moderate floods. The duration of floods influenced species differentially based on their tolerance to hypoxia: in moderate floods, richness of STH increased and numerical abundance and biomass of SIH reduced significantly. Opposite relationships were detected between dissolved oxygen and the attributes of STH and SIH. Dissolved...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dissolved oxygen; Duration of floods; Lakes and rivers; Neotropical; Water transparency.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200413
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Environmental factors related to entry into and ascent of fish in the experimental ladder located close to Itaipu Dam Neotropical Ichthyology
Fernandez,Domingo Rodrigues; Agostinho,Angelo Antonio; Bini,Luis Maurício; Gomes,Luiz Carlos.
We evaluated the seasonality of the ascent of fish in an experimental ladder located close to Itaipu Dam, and its relationships to reproduction, temperature, river level and discharge. Samplings of fish and measurements of abiotic factors were performed from February, 1995 through January, 1997, in two resting pools of the ladder. Pool A was located 10 m above the mean level of the Paraná River; Pool B was located at the upper end of the ladder, at a height of 27 m. Autoregressive models were used to remove the temporal dependence between observations. Residuals of the models were used to relate, using Pearson's correlation coefficient, the densities of fish to the environmental variables. Clear patterns of seasonality were observed for temperature. River...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish ladder; Fish migration; Environmental factors; Paraná River.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200009
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Estimates of population parameters and consumption/biomass ratio for fishes in reservoirs, Paraná State, Brazil Neotropical Ichthyology
Gubiani,Éder André; Gomes,Luiz Carlos; Agostinho,Angelo Antonio.
Consumption, natural mortality, and growth are important parameters for the construction for both fisheries and ecosystems models. We estimated k (growth constant of the von Bertalanffy's function), Loo 1(asymptotic length), Woo (asymptotic weight), Ar (caudal fin index), M (natural mortality), and Q/B (consumption/biomass ratio) for several fish species inhabiting reservoirs. We explored possible relationships among these parameters for 135 fish species sampled in thirty reservoirs in the State of Paraná, southern Brazil. Maximum length (Lmax) varied from 2.60 to 79.00 cm, Loo from 2.73 to 85.05 cm, Woo from 0.23 to 9,490.26 g, k from 0.01 to 2.38 yr-1, Ar from 0.03 to 3.60, M from 0.16 to 2.82 yr-1, and Q/B from 3.31 to 67.18. Significant correlations...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ecosystem approach; Lentic ecosystems; Population's variables.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000100017
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Factors influencing Serrapinnus notomelas (Characiformes: Characidae) populations in upper Paraná river floodplain lagoons Neotropical Ichthyology
Piana,Pitágoras Augusto; Gomes,Luiz Carlos; Cortez,Elimaida Mayo.
Identification of variables that influence fish populations is one of the main challenges in ecology. To explore this, data were collected quarterly from February 2000 to November 2001 using seines, along the shore of four isolated lagoons of the upper Paraná River floodplain. Serrapinnus notomelas was selected to assess the effect of abiotic and biotic variables using indirect gradient analysis. Abiotic variables were summarized by principal components analysis (PCA) and then the scores of the axis retained for interpretation were correlated with abundances of S. notomelas. Variables that best explained S. notomelas abundance were surface area of the lagoon, total suspended solids and Secchi depth (these last two, indirectly linked to predation). The most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Population regulation; Abiotic variables; Competition; Predation.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100008
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Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year Neotropical Ichthyology
Petry,Ana Cristina; Agostinho,Angelo Antonio; Gomes,Luiz Carlos.
Irregular rainfall and pronounced reductions of the hydrometric level in the year 2000 resulted in drastically altered hydrological connectivity of lentic environments in the upper Paraná River floodplain. The objective of the present work was to examine spatial and temporal patterns of fish assemblage attributes and structure in relation to limnological variables associated with hydrological connectivity. Fish were collected quarterly by seining in the marginal areas of 15 lagoons belonging to two biotopic categories (connected and disconnected). Variation in assemblage composition reflected the degree of hydrological connectivity. Values of assemblage attributes (species richness, density and biomass) were significantly lower in connected lagoons than in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical fishes; Fish assemblage structure; Hydrological connectivity; Floodplain.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200005
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Fish larvae from the upper Paraná River: do abiotic factors affect larval density? Neotropical Ichthyology
Baumgartner,Gilmar; Nakatani,Keshiyu; Gomes,Luiz Carlos; Bialetzki,Andréa; Sanches,Paulo Vanderlei; Makrakis,Maristela Cavicchioli.
The purpose of this study was to evaluate the role of abiotic factors on fish larvae occurrence. Samplings were carried out monthly at 12 stations (grouped in four areas) in the Amambaí, Ivaí and Paraná rivers and in the Itaipu Reservoir (upper Paraná River basin), from October 1994 to January 1995 (spawning season). Simultaneously, we obtained water temperature, pH, electrical conductivity, dissolved oxygen, water level, water velocity, and rainfall. Principal Component Analyses (PCA) and Detrended Correspondence Analyses (DCA) were applied to summarize abiotic and larvae density data, respectively. Amambaí River differed significantly from the other areas in relation to abiotic factors. Itaipu Reservoir differed significantly from the other areas...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Larval ecology; Spatial distribution; Floodplain; Itaipu reservoir; Larval drift.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400002
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Larvae of migratory fish (Teleostei: Ostariophysi) in the lotic remnant of the Paraná River in Brazil Rev. Bras. Zool.
Barzotto,Evelyn; Sanches,Paulo Vanderlei; Bialetzki,Andréa; Orvati,Lilian; Gomes,Luiz Carlos.
ABSTRACT Fish larvae and adults are morphologically distinct from each other and have different ecological requirements. Research on the dynamics of ichthyoplankton provides valuable information about the early stages of the life cycle of fish. This study analyzed the temporal and spatial distribution of the larval stages of three migratory species - Salminus brasiliensis (Cuvier, 1816), Prochilodus lineatus (Valenciennes, 1836) and Pseudoplatystoma corruscans (Agassiz, 1829) - to identify possible spawning areas in the last lotic remnant of the upper Paraná River, in the Brazilian territory. A total of 26 points were sampled monthly from October 2003 to November 2004. The PERMANOVA detected significant differences between the months only for S....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ichthyoplankton; Prochilodus lineatus; Pseudoplatystoma corruscans; Salminus brasiliensis; Upper Paraná River.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000400270
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Modeling energy flow in a large Neotropical reservoir: a tool do evaluate fishing and stability Neotropical Ichthyology
Angelini,Ronaldo; Agostinho,Angelo Antonio; Gomes,Luiz Carlos.
Recently, there is an increasing perception that the ecosystem approach gives important insights to support fisheries stock assessment and management. This paper aims to quantify energy flows in the Itaipu Reservoir (Brazil) and to simulate increase of the fishing effort of some species, using Ecopath with Ecosim software, which could allow inferences on stability. Therefore, two steady-state Itaipu models were built (1983-87 and 1988-92). Results showed that: a) there are no differences between models, and results on aging trends do not vary over time indicating that fishery does not alter the ecosystem as a whole; b) results of fisheries simulations are approximate to mono-specific stock assessment for the same species and periods; c) many authors...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ecopath; Food web; Fisheries; Ecosystem; Simulation.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200011
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Taxonomic and numeric structure of Chironomidae (Diptera) in different habitats of a Neotropical floodplain Iheringia, Sér. Zool.
Butakka,Cristina Márcia de Menezes; Gomes,Luiz Carlos; Takeda,Alice Michiyo.
We characterized the local benthic Chironomidae by analyzing the numerical density, biomass, diversity index of Shannon-Wiener and dominance of larvae in the main channel of the Ivinhema River, in a secondary channel, in five lakes connected to the main channel and in five lakes without connection. Of the 68 taxa identified, Aedokritus sp., Tanytarsus sp., Chironomus strenzkei Fittkau, 1968 and Procladius sp.1 were found in all sampling sites and were considered morphospecies with greater of greatest ecological plasticity. Chironomus strenzkei Fittkau, 1968, contributed with the greatest biomass in the central region of lakes without connection, whereas Aedokritus sp. dominated in the littoral of lakes. The greater values of diversity indices in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chironomidae larvae; Biomass; Diversity; Dominance; Paraná River.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000300007
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The Canal da Piracema at Itaipu Dam as a fish pass system Neotropical Ichthyology
Makrakis,Sérgio; Gomes,Luiz Carlos; Makrakis,Maristela Cavicchioli; Fernandez,Domingo Rodriguez; Pavanelli,Carla Simone.
The Canal da Piracema is the longest (nearly 10 km) fish pass system in the world. The construction of this fish pass was somehow controversial, because it connected two distinct ichthyofaunistic provinces. This study evaluated the ichthyofauna present in the Canal da Piracema and the abundance and distribution of long-distance migratory fish species along this fish pass system (evaluated possible selectivity). The Canal da Piracema was shown to be difficult to sample because of its environmental heterogeneity: artificial ponds, ladders and nature-like fish pass. To solve this problem, we used several fishing gears, adequate for the several biotopes present (unstructured and structured littoral were sampled with seining nets and electrofishing; lentic were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Migratory fish; Fish passage; Fishway; Paraná River.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200013
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The ichthyofauna of drifting macrophyte mats in the Ivinhema River, upper Paraná River basin, Brazil Neotropical Ichthyology
Bulla,Cíntia Karen; Gomes,Luiz Carlos; Miranda,Leandro Esteban; Agostinho,Angelo Antonio.
We describe the fish assemblages associated with drifting macrophyte mats and consider their possible role as dispersal vectors in the Ivinhema River, a major tributary of the upper Paraná River, Brazil. Fish associated with drifting mats were sampled in the main river channel during January and March 2005, when the wind and/or the increased water level were sufficient to transport macrophyte stands. Fish in the drifting mats were sampled with a floating sieve (4 m long x 2 m wide x 0.6 m high, and 2 mm mesh size). In the laboratory, larvae, juvenile, and adult fish were counted and identified to the lowest possible taxonomic level. In four drifting macrophyte mats we captured 218 individuals belonging to at least 28 species, 17 families, and 6 orders....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dispersion; Fish guilds; Floodplain; Free-floating plants; Freshwater fishes.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200018
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Trophic relationships in fish assemblages of Neotropical floodplain lakes: selectivity and feeding overlap mediated by food availability Iheringia, Sér. Zool.
Dias,Rosa Maria; Ortega,Jean Carlo Gonçalves; Gomes,Luiz Carlos; Agostinho,Angelo Antonio.
ABSTRACT. The relationships between the degree of dietary overlap and food availability, and implications for food selectivity of fish species were evaluated at floodplain lakes on the upper Paraná River floodplain, Brazil. The hypothesis tested were: i) species become less selective in lakes with high availability of food resources; and ii) species (interspecific) or individual (intraspecific) present higher food overlap in conditions of high availability of food resources. In general, with the results was observed that species become less selective when the environment provided higher availability of food resources. Interspecific overlap did not show a pattern when evaluating availability of food resources in the lakes. However, intraspecific overlap...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish feeding; Electivity; Paraná River.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100292
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Utilization of the fish ladder at the Engenheiro Sergio Motta Dam, Brazil, by long distance migrating potamodromous species Neotropical Ichthyology
Makrakis,Sérgio; Makrakis,Maristela Cavicchioli; Wagner,Ricardo Luiz; Dias,João Henrique Pinheiro; Gomes,Luiz Carlos.
Utilization of the fish ladder installed at the Engenheiro Sergio Motta Dam (also known as Porto Primavera) on the Paraná River, Southern Brazil, by long-distance migrating potamodromous species (sampling Protocol I), and ascending and descending movements (Protocol II) were evaluated. Three pools along the fish ladder (designated as lower, middle, and upper) were sampled monthly between December, 2004 and March, 2005 to determine the abundance of species in the ladder. The ascending and descending movements of the species in the ladder were also analyzed in the same period. In the samples for both protocols, 37 species representing 17 families and 5 orders (Characiformes, Siluriformes, Perciformes, Gymnotiformes, and Myliobatiformes) were recorded....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paraná River; Migratory fish; Transposition; Fish passage.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200014
Registros recuperados: 18
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