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Registros recuperados: 72
Primeira ... 1234 ... Última
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Uptake and elimination of endosulfan by zebra fish. Repositório Alice
TOLEDO, M. C. F.; JONSSON, C. M..
Tipo: Separatas Palavras-chave: Elimination; Fishes; Bioconcentration; Contamination; Residues; Eliminacao; Peixes; Paulistinha; Brachydanio rerio; Bioconcentracao; Toxicocinetica; Residuos.; Absorção; Contaminação; Endosulfan; Inseticida; Pesticida; Toxicologia.; Absorption; Insecticides; Pesticides; Toxicology..
Ano: 1992 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/10494
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Alterações bioquímicas em tilápias decorrentes da exposição a uma mistura de três herbicidas. Repositório Alice
OLIVEIRA, E. A. de; JONSSON, C. M.; CLEMENTE, Z.; VALLIM, J. H.; MELLO, M. A. M. de M. e.
Resumo: O cultivo da cana de açúcar no Brasil utiliza grandes quantidades de herbicidas, o que constitui um sério risco para a biota aquática, se o manejo dos mesmos não for adequado. Uma prática comum é a aplicação de mistura de herbicidas. No presente trabalho avaliaram-se alterações da atividade de enzimas hepáticas de tilápias (Oreochromis niloticus) expostas em condições subletais a uma mistura diurom+hexazinona+tebutiurom. Mesmo em concentrações mais baixas das que manifestam efeitos agudos, enzimas antioxidantes e que auxiliam na eliminação do xenobióticos; Foram alteradas quanto ao seu padrão de normalidade. Os dados contribuem para o estabelecimento de concentrações máximas permissíveis de herbicidas no compartimento aquático e na identificação de...
Tipo: Separatas Palavras-chave: Toxicidade; Tebutiuron.; Fishes; Peixe; Tilapia nilótica; Oreochromis niloticus; Herbicida; Enzima; Poluição da água.; Herbicides; Diuron; Hexazinone; Toxicity..
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/967888
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Variações sazonais e de fotoperíodo sobre a ingestão e absorção de alimentos em tilápias do Nilo Oreochromis niloticus. Repositório Alice
LOURENÇO, J. N. de P..
Estudo sobre a participacao do fotoperiodo nas variacoes sazonais de ingestao de alimentos, ganho de peso, crescimento especifico e absorcao de proteina no intestino da tilapia do Nilo. Durante 30 dias, foram utilizados 64 peixes, divididos em dois grupos, mantidos em aquarios de vidro (4 peixes por aquario, agua em 25oC), sem comunicacao quimica ou visual, submetidos a dois regimes de luminosidade (14L:10E, regime de 14h/luz e 10h de escuro, e 10L:14E, regime de 10h/luz e 14h de escuro). A ingestao de alimentos foi determinada a cada dez dias e ao final do periodo. A absorcao, avaliada a cada dez dias e todas as outras variaveis determinadas ao final do periodo experimental. Foi observado que, durante o periodo experimental de verao, houve aumento de...
Tipo: Teses Palavras-chave: Brasil; Sao Paulo; Fishes; Feeding; Photoperiodicity; Alimentação; Fotoperiodismo; Oreochromis Niloticus; Peixe; Tilápia.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/666721
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Determinação de níveis protéicos adequados para a nutrição do matrinxã (Brycon cephalus - Gunther, 1869). Repositório Alice
IZEL, A. C. U..
Estudos sobre as necessidades proteicas do matrinxa, visando proporcionar maior crescimento em menor espaco de tempo. Foram testados cinco niveis de proteina bruta, em racoes isocaloricas, em delineamento experimental inteiramente casualizado. Com base nos resultados, apos 210 dias de estudos, ficou demonstrado que as racoes contendo 25% e 28% de proteina bruta proporcionaram maior crescimento corporal e melhor conversao alimentar, dentre os niveis testados. Foi observado, tambem, que a melhor relacao entre o crescimento corporal, conversao alimentar e custo com racao por kg de peixe produzido ocorre com a utilizacao de racao com nivel de proteina bruta proximo a 28%, indicando que esse nivel pode atender a contento as exigencias proteicas dessa especie...
Tipo: Teses Palavras-chave: Brasil; Amazonas; Manaus; Fishes; Matrinxã; Nutrição; Brycon cephalus; Nutrition.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/670511
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The use of biomarkers for assessing effects of pollutant stress on fish species from a tropical river in Southeastern Brazil Biological Sciences
Morado, Claudio Nona; Araújo, Francisco Gerson; Gomes, Iracema David.
Biomarkers are measurements within an organism that respond to environmental effects and are used as tools in bioassessment programs since they reflect physiological changes induced by exposure to pollutants. The hepatosomatic index (HSI) and the condition factor (CF) in three fish species Geophagus brasiliensis, Hypostomus affinis and Hypostomus auroguttatus were used to assess effects of pollutant stress in a tropical river during two seasons (dry and wet). Fish from the least disturbed sites had the lowest condition factor (CF) and the lowest HSI, whereas those from sites near pollutant discharges had the highest CF and HSI. Higher HSI and lower CF occurred during the dry season. It is suggested that species adapted to stressful conditions take...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.03.00.00-0 Ecologia condition factor; Hepatosomatic index; Fishes; Monitoring; Rivers. Ecologia de peixes.
Ano: 2017 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/34293
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Effect of alcohol and formaldehyde on the δ13C and δ15N isotopic composition of Plagioscion squamosissimus and Hypophthalmus edentates (Pisces, Osteichthyes) - doi: 10.4025/actascibiolsci.v33i4.70 Biological Sciences
Manetta, Gislaine Iachstel; UEM; Benedito, Evanilde; UEM, Maringá; Ducatti, Carlos; UNESP.
The present study investigates the δ13C and δ15N isotopic composition in frozen samples (control), samples in alcohol and in formaldehyde of Plagioscion squamosissimus and Hypophthalmus edentates. From each individual we extracted a strip of muscle from the region above the lateral line, in the dorsal fin base, that was divided into three equal parts, each one was submitted to one type of treatment: freeze – control group (-15oC), conservation in alcohol 70% and fixation in formaldehyde 4%. Samples were kept under those treatments for 30 days, washed and submerged in distilled water for 4 hours. Afterwards, they were dried up in air oven at 60oC for 48 hours and macerated until the obtaining of a fine powder. A significant difference...
Tipo: Composição isotópica Palavras-chave: Stable isotope; Preservative; Fishes; Plagioscion squamosissimus; Hypophthalmus edentatus 2.05.00.00-9 Ecologia stable isotope; Preservative; Fishes; Plagioscion squamosissimus; Hypophthalmus edentatus.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7045
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Life History Parameters of Genypterus brasiliensis (Teleostei: Ophidiidae), an Endemic Fisheries Resource of the Southwestern Atlantic Anais da ABC (AABC)
TOMÁS,ACÁCIO R.G.; ELEUTERIO,CELSO L.T.; VELASCO,GONZALO.
Abstract: Genypterus brasiliensis, a demersal fish of large size (1.3 m of total length), occurs in the southwest Atlantic (23 to 38oS) and well appreciated due to the quality of its flesh. It was analyzed through longline and trawl fisheries, and the average length and weight of 724 specimens were significantly different between them, with the biggest and heaviest specimens caught by the former. The weight-length relationships were significantly different based upon sex: females Wt=4x10-7Lt3.3799; r2=0.97; n=262; p<0.001, and males: Wt=4x10-7Lt3.3886; r2=0.95; n=190; p<0.001. Using the otoliths readings for 153 specimens (APE of 2% and CV of 4.2%), the growth parameters estimates reveal statistical differences between sexes (p=0.05; r2=0.889). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Population dynamics; Endemism; Fishes; Fisheries.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500609
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Ichthyofauna of streams of the Rio Sapucaí basin, upper Rio Paraná system, Minas Gerais, Brazil Biota Neotropica
Azevedo-Santos,Valter M.; Britski,Heraldo A.; Oliveira,Claudio; Benine,Ricardo C..
Abstract: The Rio Sapucaí basin, in Minas Gerais State, Brazil, is one of the many watersheds of the upper Rio Paraná system. Ichthyofauna surveys in this basin, in general, are scarce. In addition, small rivers and streams of the region have been targets of anthropogenic actions (e.g., pollution) - which suggest that more ichthyological studies must be performed within the watershed. In this study we provide a survey of species that occur within three streams of the lower Rio Sapucaí basin. Samples were collected in April, July, and November 2017 and in May 2018. Collections resulted in 349 individuals belonging to 28 species, five orders, and 12 families. Among our findings are three putatively undescribed species and the first record of Oligosarcus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fishes; Inventory; Oligosarcus argenteus; Pareiorhina hyptiorhachis; Undescribed species.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000100309
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Cytochemical aspects of the peripheral blood cells of Oreochromis (Tilapia) niloticus. (Linnaeus, 1758) (Cichlidae, Teleostei): part II Braz. J. Vet. Res. Anim. Sci.
UEDA,Ivete Kotomi; EGAMI,Mizue Imoto; SASSO,Wilson da Silva; MATUSHIMA,Eliana Reiko.
Morphologicaly, seven types of cells were identified in the blood of Oreochromis niloticus: erythrocytes, thrombocytes, neutrophils, eosinophils, basophils, lymphocytes and monocytes. Glycogen was present not only in the cytoplasm of neutrophils and thrombocytes but also in some lymphocytes and monocytes. The positive reaction for myeloperoxidase and Sudan black was observed in neutrophils and eosinophils. The bromphenol blue method was strongly positive for erythrocytes and eosinophils.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Blood cells; Cytochemistry; Oreochromis niloticus; Fishes.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962001000600005
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Physicochemical and microbiological changes in gutted and ungutted red tilapia (Oreochromis ssp) stored in ice Ciencia e Investigación Agraria
Ruíz-Osorio,Yaneth L; Amorocho-Cruz,Claudia M; Gutiérrez-Guzmán,Nelson.
We assessed the degree of freshness of gutted and ungutted red tilapia (Oreochromis ssp) using physicochemical and microbiological analyses of samples of gutted red tilapia on days 0, 3, 5, 8, 11, 14 and 17 and of ungutted red tilapia on days 0, 3, 6, 9, 11, 14 and 16. The total sample size was five fish stored in ice at temperatures between 0 and 4 °C. Different methods were used to study the degree of freshness: pH, water holding capacity (WHC) and microbiological analysis (aerobic mesophilic count). Once we obtained the results, a one-way analysis of variance (ANOVA) was used to determine possible correlations between the values of deterioration and the data obtained by other analysis methods. The one-way ANOVA showed that statistically significant...
Tipo: Journal article Palavras-chave: Aerobic mesophilic bacteria; Fishes; PH; Storage; Water holding capacity; WHC.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000200012
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Anoxia- and hypoxia-induced expression of LDH-A* in the Amazon Oscar, Astronotus crassipinis Genet. Mol. Biol.
Almeida-Val,Vera Maria Fonseca; Oliveira,Alice Reis; Silva,Maria de Nazaré Paula da; Ferreira-Nozawa,Monica Stropa; Araújo,Roziete Mendes; Val,Adalberto Luis; Nozawa,Sérgio Ricardo.
Adaptation or acclimation to hypoxia occurs via the modulation of physiologically relevant genes, such as erythropoietin, transferrin, vascular endothelial growth factor, phosphofructokinase and lactate dehydrogenase A. In the present study, we have cloned, sequenced and examined the modulation of the LDH-A gene after an Amazonian fish species, Astronotus crassipinis (the Oscar), was exposed to hypoxia and anoxia. In earlier studies, we have discovered that adults of this species are extremely tolerant to hypoxia and anoxia, while the juveniles are less tolerant. Exposure of juveniles to acute hypoxia and anoxia resulted in increased LDH-A gene expression in skeletal and cardiac muscles. When exposed to graded hypoxia juveniles show decreased LDH-A...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon; Fishes; Gene expression; RT-PCR; LDH-A; Hypoxia; Anoxia.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200025
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Genetic variability in Astyanax altiparanae Garutti &amp; Britski, 2000 (Teleostei, Characidae) from the Upper Paraná River basin, Brazil Genet. Mol. Biol.
Peres,Maria Dolores; Vasconcelos,Marcio dos Santos; Renesto,Erasmo.
Allozyme data was used to assess the genetic diversity Astyanax altiparanae populations from the floodplain of the Upper Paraná River (PR). Specimens were collected in the southern Brazilian state of Paraná from PR in Porto Rico municipality and Ribeirão Ficha (RF) in Ubiratã municipality. The authors used 15% (w/v) corn starch gel electrophoresis to identify 21 putative loci for 13 enzymatic systems: Aspartate aminotransferase, 2.6.1.1 (AAT), Acid phosphatase, 3.1.3.2 (ACP), Esterase, 3.1.1.1 (EST), Glycerol-3-phosphate dehydrogenase, 1.1.1.8 (G3PDH), Glucose-6-phosphate dehydrogenase, 1.1.1.49 (G6PDH), Glucose-6-phosphate isomerase, 5.3.1.9 (GPI), Iditol dehydrogenase, 1.1.1.14 (IDDH), Isocitrate dehydrogenase - NADP+, 1.1.1.42 (IDH), L-Lactate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allozymes; Astyanax; Fishes; Genetic variability; Paraná River floodplain.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500011
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Life history traits of Characidium pterostictum (Characiformes, Crenuchidae) along the longitudinal gradient of a Neotropical river in southern Brazil Iheringia, Sér. Zool.
Fitz,Raquel C.; Rodenbusch,Cesar A.; Dala-Corte,Renato B.; Azevedo,Marco A..
ABSTRACT Life history traits of Characidium pterostictum Gomes, 1947 (Characiformes, Crenuchidae) from three different reaches of the upper Sinos river, southern Brazil, were described and comparatively analyzed according to the longitudinal gradient. For all reaches, results indicated a seasonal reproductive strategy with a higher intensity during warmer months of higher photoperiod (November to February). Only females were found in the upstream reach and they were more numerous than males in all the sampled reaches. Mean absolute fecundity ranged from 5189 (±2131 SD) to 7394 (±3807 SD), whereas mean relative fecundity (oocytes per mg of female total weight) ranged from 1.08 (±0.40 SD) to 1.12 (±0.29 SD). Oocyte development was characterized as synchronic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fishes; Reproductive period; Size at first maturation; Fecundity; Body size.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100202
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Biologia alimentar de Steindachnerina brevipinna (Characiformes, Curimatidae) do rio Ibicuí-mirim, Rio Grande do Sul, Brasil Iheringia, Sér. Zool.
Giora,Júlia; Fialho,Clarice B..
The feeding biology of Steindachnerina brevipinna (Eigenmann &amp; Eigenmann, 1889) is described based on specimens collected in the Ibicuí-Mirim river, Rio Grande do Sul, Brazil, from April 2001 to March 2002. Diet description is based on the analysis of the frequency of occurrence and index of dietary importance of the ingested items. The monthly variation of stomach repletion, hepatosomatic and intestinal indexes was also analyzed. Major feeding activity occurred before (May, June and July 2001) the reproductive period, with the hepatosomatic index values showing similar variation along the year. Both the mean intestinal quotient and the analysis of the main ingested items (Bacillariophyta and Chlorophyta algae) indicate a detritivorous diet.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Detritivory; Feeding; Steindachnerina; Fishes.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000300007
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Fish assemblage composition in a tributary of the Mogi Guaçu river basin, southeastern Brazil Iheringia, Sér. Zool.
Oliveira,Alexandre Kannebley de; Garavello,Júlio César.
Fish assemblage composition and seasonal patterns of species abundance were studied in Cabaceiras stream, a tributary of the Mogi Guaçu river in São Paulo State, Brazil. Three stations were sampled monthly from June 1999 to May 2000 using sieves and small trawl net and gill nets. Fifteen fish families, 37 genera and 45 species were captured. Characiformes (27 spp.) and Siluriformes (13 spp.) were the most species-rich orders. Gymnotiformes and Perciformes were represented by two species each, and Synbranchiformes had only a single species. One group of species (approximately 75 %) persisted in the stream throughout the year. A second group (approximately 25 %) contained species that only occupy the stream for a limited period of their life cycle, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fishes; Seasonality; Stream; Paraná system; Mogi Guaçu river.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000200002
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The diet of the South American sea lion (Otaria flavescens) at Río Negro, Patagonia, Argentina, during the winter-spring period Iheringia, Sér. Zool.
Bustos,Raimundo L.; Daneri,Gustavo A.; Volpedo,Alejandra V.; Harrington,Ana; Varela,Esperanza A..
The South American sea lion, Otaria flavescens (Shaw, 1800) population is steadily expanding along the Patagonian coast of Argentina in the last decades. However, little is known about the feeding ecology of the species in the area. The aim of this study was to analyze the food habits of O. flavescens from 91 scats collected at Río Negro province, during the winter and spring of 2005. Fish occurred in 96% of scats containing prey remains, followed by cephalopods (26%). Raneya brasiliensis (Kaup, 1856) was the most frequent and abundant species occurring in 58.6% of samples and constituting almost 50% of fish predated. Second in importance were Porichthys porosissimus (Cuvier, 1829) and Cynoscion guatucupa (Cuvier, 1830) in terms of occurrence (%FO 20.7)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trophic ecology; Pinnipedia; Fishes; Cephalopods.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000400005
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Influence of feeding plasticity on the fitness of small Neotropical characids Iheringia, Sér. Zool.
Fiori,Leandro Fabrício; Alves,Gustavo Henrique Zaia; Hahn,Norma Segatti; Benedito,Evanilde.
Abstract This study investigated the diet of four characids [Hyphessobrycon eques (Steindachner, 1882), Odontostilbe pequira (Steindachner, 1882), Psellogrammus kennedyi (Eigenmann, 1903) and Serrapinnus calliurus (Boulenger, 1900) ] coexisting in two lagoons and checked for possible spatial differences and the influence on population fitness. The main goal was check if these species show better fitness according to the nutritional value of the food resource consumed. In this way, it is expected that the species show improved nutritional conditions (evidenced by the relative condition factor) when foraging for items of animal origin, and the reverse is expected when consuming items of plant origin and detritus. Sampling was conducted in August 2011. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fishes; Diet; Condition factor; Pantanal; Lagoons.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212016000100206
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Revisão taxonômica e relações filogenéticas das espécies de Roeboides grupo-microlepis (Ostariophysi, Characiformes, Characidae) Iheringia, Sér. Zool.
Lucena,Carlos Alberto Santos.
The Roeboides microlepis species-group is revised. Four species are recognized: R. myersii Gill, 1870 from the Amazon basin, R. microlepis (Reinhardt, 1851) from river Paraguay, middle and lower river Paraná, R. araguaito sp. nov. from the river Orinoco basin, and R. margareteae sp. nov. known only from Rio Parnaíba and Pindaré-Mearim, northeastern Brazil. The type-locality of R. microlepis is restricted to river Paraguay; R. bonariensis (Steindachner, 1879) is considered a synonym of R. microlepis. The phylogenetic analysis indicates that R. myersii and R. araguaito are most parsimoniously related and may be a sister group. These two species are here considered as sister group of the monophyletic lineage which includes R. microlepis and R. margareteae. A...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fishes; Neotropical; Taxonomy; Roeboides; Phylogeny.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000300008
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Can dams affect the trophic structure of ichthyofauna? A long-term effects in the Neotropical region Iheringia, Sér. Zool.
Lima,Felipe P. de; Nobile,André B.; Freitas-Souza,Diogo; Carvalho,Edmir D.; Vidotto-Magnoni,Ana P..
ABSTRACT Dams are considered an important source of modification upon the structure of aquatic communities and their reflexes are diverse on the fish fauna. Although there are several hydroelectric power plants in Brazil, the long-term effects on feeding activity of ichthyofauna are unknown. Thus, this study aimed to investigate the long-term effects of an old reservoir (fifty years) on the trophic dynamics of fish fauna. The diet of 20 fish species was analyzed, identifying 37 food items belonging to six trophic categories, which enable to create six trophic groups. The results found here suggests that throughout the creation of a reservoir, the trophic structure of the fish assemblages tend to reach trophic homeostasis, in which the fish community will...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding ecology; Old dam; Trophic stabilization; Resource availability; Fishes.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212018000100230
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Consequências da monocultura de braquiárias e da invasão de cambarazais e algodoais sobre a ictiofauna de alagados no Pantanal. Infoteca-e
ROSA, F. R. da; RESENDE, E. K. de.
As áreas inundáveis do Pantanal são importantes ambientes de alimentação, crescimento e desova para a ictiofauna. A vegetação das áreas inundáveis passa por fortes mudanças, em parte causadas por oscilações naturais do nível hidrológico, em parte ocasionada pelo manejo humano da paisagem. São exemplos dessas mudanças, naturais ou antrópicas, a substituição de campos nativos pela expansão de algodoais (Ipomoea carnea), cambarazais (Vochysia divergens) e pela introdução das forrageiras Brachiaria spp. Avaliamos as consequências dessas substituições sobre a ictiofauna em áreas alagáveis do Pantanal Norte. Comparamos riqueza de espécies, biomassa e abundância das ictiocenoses coletadas em 30 parcelas com 25 m2. Registramos 101 espécies de peixes de variados...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Áreas inundáveis; Impactos ambientais; Peixes; Environmental impacts; Fishes; Flooded areas.
Ano: 2011 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/920837
Registros recuperados: 72
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