Consulta: subjectFacets:"Characidae"
Registros recuperados: 33
Data/hora: 10/06/2024 03:33:52

REDESCRIPCION DE SACCOCOELIOIDES OCTAVUS SZIDAT 1970 Y S. BACILLIFORMIS SZIDAT, 1973 (DIGENEA, HAPLOPORIDAE), PARASITOS DE PECES DEL GENERO ASTYANAX BAIRD &amp;amp; GIRARD 1854 (PISCES: CHARACIDAE)
Provedor de dados: 72
Autores: Lunaschi,Lia I.
RESUMEN Se redescribe e ilustra a Saccocoelioides octavus &lt;A HREF="#szidat70"&gt;Szidat 1970&lt;/A&gt; y S. bacilliformis &lt;A HREF="#szidat73"&gt;Szidat, 1973&lt;/A&gt; (Digenea, Haploporidae) en base a material tipo depositado en la Colección Helmintológica del Museo Bernardino Rivadavia, Buenos Aires, Argentina. La descripción original de ambas especies es breve, imprecisa y los datos morfométricos de cada una están referidos a un solo espécimen. El estudio detallado de cinco especímenes tipo de S. octavus, colectados en los ciegos pilóricos de Astyanax fasciatus (Cuv.), del holotipo y siete paratipos de S. bacilliformis, colectados en los ciegos pilóricos de Astyanax bipunctatus, revela que ambas son morfológicamente y morfométricamente similares;...
Tipo: Journal article
Palavras-chave: Saccocoelioides octavus; Saccocoelioides bacilliformis; Haploporidae; Digenea; Astyanax; Characidae; Argentina.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100005

THE CONSERVATION STATE OF CHARACIDAE FISH (PISCES: CHARACIFORMES) IN AN AREA OF THE PLATA BASIN, ARGENTINA
Provedor de dados: 72
Autores: Zayas,Marcelo A; Cordiviola,Elly.
The fish conservation was quantified by means of the index SUMIN, composed by the summation of 12 outstanding variables for the species survival and/or conservation. An arranged list of 53 species was obtained according to a gradient of conservation necessity. The species determined as vulnerable of maximum priority: Salminus brasiliensis, Pygocentrus nattereri, Serrasalmus marginatus and S. rhombeus; species vulnerable of special attention: Brycon orbygnianus, Triportheus paranensis, Serrasalmus serrulatus, S. spilopleura, Piaractus mesopotamicus, Hemigrammus mattei, Cynopotamus argenteus, Astyanax correntinus, Gymnocorymbus ternetzi, Hyphessobrycon anisitsi and Mylossoma orbignyanus. The remaining species, were qualified as not threatened: Poptella...
Tipo: Journal article
Palavras-chave: Conservation; Fish; Characidae; South America.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200006

B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil)
Provedor de dados: 74
Autores: Torres-Mariano,Alessandra Ribeiro; Morelli,Sandra.
A cytogenetic study was conducted on an Astyanax eigenmanniorum population from the Caetano Stream (18° 44' 56" S/ 048° 18' 39" W) - in Uberlândia, MG, Brazil - showing a modal diploid number of 48 chromosomes in the standard male and female karyotypes. However, in several specimens it was also possible to observe metaphases with one or two B chromosomes, increasing the diploid number to 49 or 50 chromosomes, respectively. The supernumerary chromosomes were totally heterochromatic and highlighted after C-banding. The silver-stained nucleolus organizing regions (Ag-NORs) were located in at least five chromosomes of the standard karyotype, thus characterizing a multiple NOR system in the species. This is the first occurrence of an A. eigenmanniorum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Astyanax eigenmanniorum; Supernumerary chromosome; Heterochromatin; Nucleolus organizing regions (NORs).
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200015

Dinâmica reprodutiva de Oligosarcus jenynsii e O. robustus (Characiformes, Characidae) na lagoa Fortaleza, Rio Grande do Sul, Brasil
Provedor de dados: 76
Autores: Nunes,Daniela M.; Pellanda,Mateus; Hartz,Sandra Maria.
Oligosarcus jenynsii (Günther, 1864) and O. robustus Menezes, 1969 are fish species distributed in Rio Grande do Sul, Brazil, Uruguay, and northern Argentina. The reproductive period and recruitment, sex ratio, absolute and relative fecundity, and body length at first gonadal maturation of the two carnivorous species from Fortaleza Lagoon were analized. The specimens were sampled monthly, from May 2000 to April 2001, with fishing effort of 24 hours/month, using stationary gillnets of different mesh sizes and seine net (three samples per edge). The records of each individual included total length, total weight, gonad weight, sex and gonadal maturity stage. The reproductive period of both O. jenynsii and O. robustus ranges from May/June to November/December,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oligosarcus; Reproduction; Characidae; Southern Brazil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000100001

Redescription of Moenkhausia doceana(Steindachner, 1877) (Ostariophysi: Characiformes): a characid from the Northeastern Mata Atlântica ecoregion, Brazil
Provedor de dados: 83
Autores: Carvalho,Fernando R.; Sarmento-Soares,Luisa M.; Martins-Pinheiro,Ronaldo F.
Moenkhausia doceana is redescribed from the Northeastern Mata Atlântica ecoregion drainages in Espírito Santo, Minas Gerais, and Bahia states. The species is distinguished from its congeners by a long anal fin, with 29-34 (mode 32) branched rays; 4-7 (mode 5) maxillary teeth; and 7-8 (mode 7) scale rows above lateral line at dorsal-fin origin. Phylogenetic hypothesis about its relationships among the Characidae is also presented and commented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Lambari; Rio Doce; Systematics; Tetragonopterus.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200377

Age, growth, mortality and yield per recruit of the dourado Salminus brasiliensis, Corumbá Reservoir, Goiás State, Brazil
Provedor de dados: 83
Autores: 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

Habitat and community structure modulate fish interactions in a neotropical clearwater river
Provedor de dados: 83
Autores: Nunes,Lucas T.; Morais,Renato A.; Longo,Guilherme O.; Sabino,José; Floeter,Sergio R.
ABSTRACT Species interactions can modulate the diversity and enhance the stability of biological communities in aquatic ecosystems. Despite previous efforts to describe fish interactions in tropical rivers, the role of habitat characteristics, community structure, and trophic traits over these interactions is still poorly understood. To investigate among-habitat variation in substratum feeding pressure and agonistic interactions between fishes, we used remote underwater videos in three habitats of a clearwater river in the Central Western, Brazil. We also performed visual surveys to estimate the abundance and biomass of fishes and proposed a trophic classification to understand how these variables can affect fish interactions. Community structure was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bodoquena plateau; Centrality; Characidae; Feeding pressure; Habitat heterogeneity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100217

Two new species of Odontostilbe historically hidden under O. microcephala (Characiformes: Cheirodontinae)
Provedor de dados: 83
Autores: Chuctaya,Junior; Bührnheim,Cristina M.; Malabarba,Luiz R.
ABSTRACT Specimens historically identified as Odontostilbe microcephala from the upper rio Paraná and Andean piedmont tributaries of the río Paraguay are reviewed and split in three species. We found that the distribution of O. microcephala is restricted to the Andean slope of the río Paraguay basin. The species is distinguished from congeners with subterminal mouth by the elongate body, usually 10-12 gill rakers on upper branch and smaller horizontal orbital diameter (24.6-32.8 % HL, mean 28.7%). Specimens from upper rio Paraná constitute two new species, diagnosed from other Cheirodontinae by the presence of mesopterygoid teeth, grouped on median portion and forming a continuous row. The new species are distinguished from each other by having...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Characidae; La Plata River basin; Mesopterygoid teeth; Taxonomy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100205

Hyphessobrycon brumado: a new characid fish (Ostariophysi: Characiformes) from the upper rio de Contas drainage, Chapada Diamantina, Bahia, Brazil
Provedor de dados: 83
Autores: Zanata,Angela M.; Camelier,Priscila.
A new species of Hyphessobrycon Ellis is described from tributaries of the upper rio de Contas, Bahia, Brazil. The new species can be diagnosed from its congeners by having low body depth, a broad black stripe along lateral of body that extends weakly through median caudal-fin rays, absence of humeral spot and orange- to reddish life coloration.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: New species; Characidae; Neotropical; Northeastern Brazil; Headwaters.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400006

Astyanax vermilion and Astyanax burgerai: new characid fishes (Ostariophysi: Characiformes) from Northeastern Bahia, Brazil
Provedor de dados: 83
Autores: Zanata,Angela M.; Camelier,Priscila.
Two new Astyanax species, A. vermilion, from rio Almada and rio Cachoeira, and A. burgerai, from rio Almada, Bahia State, Brazil, are described. Astyanax vermilion is distinguished from most of its congeners and from all other Astyanax species known from northeastern Brazilian drainages by having distal portion of pelvic fins dark, a combination of sexually dimorphic characters, posteroventral portion of body and fins (except pectoral) reddish in life, and inconspicuous humeral and caudal spots. It also differs by having highest body depth just anterior of dorsal-fin origin, 32-34 lateral-line scales, and presence of one or two maxillary teeth. Astyanax burgerai is diagnosed by the presence of two vertically elongated humeral blotches, absence of a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: New species; Sexual dimorphism; Coastal drainages; Characidae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200007

Reproductive tactics used by the Lambari Astyanax aff. fasciatus in three water supply reservoirs in the same geographic region of the upper Iguaçu River
Provedor de dados: 83
Autores: Silva,Juliano Pilotto Abelardino da; Muelbert,Adriane Esquivel; Oliveira,Elton Celton de; Fávaro,Luís Fernando.
The species Astyanax aff. fasciatus was investigated as regards differences in reproductive tactics in three reservoirs with different ages (Iraí, Piraquara and Passaúna) located in the same geographic region. The biological material was obtained through monthly collections carried out from july/2006 to june/2007. The average value of the gonadosomatic index (GSI) in Passaúna reservoir was significantly higher in relation to the values obtained in the other reservoirs. Spawning was total in Iraí reservoir and partial in the others. Allometric growth of the species was negative in Iraí reservoir and positive in the others. The highest condition factor value was estimated in Iraí reservoir, followed by Piraquara and Passaúna reservoirs, respectively. Females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Succession; Spawning; Condition factors; Sex ratio.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400019

How does diet influence the reproductive seasonality of tropical freshwater fish?: A case study of a characin in a tropical mountain river
Provedor de dados: 83
Autores: Ballesteros,Tania M.; Torres-Mejia,Mauricio; Ramírez-Pinilla,Martha P.
Seasonal breeding of tropical freshwater fish may be synchronized with periods of high food consumption. We explored this hypothesis by studying the relationship between diet and reproductive activity of Creagrutus guanes (Teleostei, Characidae). Our results showed that C. guanes had a generalist and omnivorous diet dominated by aquatic insects (mainly Diptera larvae) and seeds. Creagrutus guanes did not show intersexual or ontogenetic variation in diet. Peaks of feeding activity during rainy months were not synchronized with breeding in dry months. Our results do not support the hypothesis that the reproductive season has to be synchronized with high food consumption. We discussed the hypothesis fat reserves may be an important factor for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding ecology; Phenology; Characidae; Fat reserves; Breeding; Creagrutus guanes.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400019

Induced reproduction in a migratory teleost species by water level drawdown
Provedor de dados: 83
Autores: Chehade,Chayrra; Cassel,Mônica; Borella,Maria Inês.
Captive reproduction is one of the problems faced in aquaculture requiring the manipulation of environmental factors and/or hormonal treatment. Thus, we seek to verify experimentally which gonadal changes were present in mature individuals of Astyanax altiparanae arising from decreased water level. Collections were made every four hours, initiated four hours before and finished 28 hours after stimulation, at the Fish Farming Station of Companhia Energética de São Paulo, São Paulo, Brazil. The gonads were analyzed by light microscopy. The females had ovaries in the spawning capable phase until 12h; in 16h, in a more advanced stage of spawning capable phase; and, from 20h, in the regressing phase. Males had testes in the spawning capable phase until 8h; in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asynchronous reproduction; Characidae; Gametogenesis; Gonadosomatic index; Histology.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000100205

A systematic review of diapoma (teleostei: characiformes: characidae: stevardiinae: diapomini) with descriptions of two new species from southern Brazil
Provedor de dados: 84
Autores: Menezes,Naércio A.; Weitzman,Stanley H.
Diapoma is reviewed and four species are recognized: (1) Diapoma thauma, new species, from streams of the rio Jacuí basin, state of Rio Grande do Sul; (2) D. pyrrhopteryx, new species collected from the rio Canoas and streams flowing into this basin in the states of Rio Grande do Sul and Santa Catarina, Brazil; (3) Diapoma terofali, from streams flowing into rio Uruguay in Uruguay and Rio Grande do Sul, Brazil and streams flowing into rio de la Plata, Argentina; and (4) Diapoma speculiferum, from lowland coastal streams in Rio Grande do Sul, Brazil and Uruguay. Diapoma pyrrhopteryx possess the posteroventral opercular elongation typical of D. speculiferum, type species of the genus, but which is absent in D. thauma and D. terofali. Nonetheless, all the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; New species; Characidae; Diapoma.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011000500001

Meso and microhabitat analysis and feeding habits of small nektonic characins (Teleostei: Characiformes) in Neotropical streams
Provedor de dados: 103
Autores: Ceneviva-Bastos,Mônica; Casatti,Lilian; Rossa-Feres,Denise Cerqueira.
The habitat use and feeding habits of a set of nektonic fish species often found in small low-gradient streams in Brazil were investigated. The core species in the present study was Knodus moenkhausii (Eigenmann &amp;amp; Kennedy, 1903), the most abundant of five species in the nektonic guild. Records of the species in 22 streams indicate that K. moenkhausii is associated, on a mesohabitat scale, with runs, and on a microhabitat scale, with sandy bottoms, intermediate depth, and open sites without coverage or submerged vegetation. During snorkeling observations, two additional nektonic registered species showed spatial segregation from K. moenkhausii with respect to foraging microhabitats. Feeding habits of the observed nektonic species were significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Habitat use; Resources; Upper Paraná.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000200006

Dynamics and cytochemistry of oogenesis in Astyanax fasciatus (Cuvier) (Teleostei, Characiformes, Characidae) from Rio Sapucaí, Minas Gerais State, Brazil
Provedor de dados: 104
Autores: Garcia,José Antônio Dias; Chini,Helena A.S.; Maistro,Edson Luis; Quagio-Grassiotto,Irani.
Oogenesis involves a set of transformations which are undergone by female germ cells These cells change into oogonias and then into mature oocytes. Sexually mature female fish were collected monthly, during one year, from the Sapucaí River, a tributary of the Rio Grande, which is part of the Furnas Reservoir in the state of Minas Gerais. During the several stages of maturation, we observed small round oogonias with a large nucleus, a single nucleolus, and weakly stained cytoplasm with eosinophilic granules. The primary oocytes showed a large basophilic nucleus, with a developed peripheral nucleolus and a reduced cytoplasm. The previtellogenic oocytes presented voluminous cytoplasm and nucleus with several small peripheral nucleoli. The oocytes underwent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Teleostei; Characidae; Astyanax fasciatus; Oogenesis; Cytochemical.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400003

Influência de diferentes níveis de vitamina C na ração sobre parâmetros hematológicos de alevinos de Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae)
Provedor de dados: 104
Autores: Martins,Maurício Laterça; Castajjnolli,Newton; Zuim,Sônia Maria Fontes; Urbinati,Elisabeth Criscuolo.
Haematological changes in ascorbic acid deficient fishes, observed by some authors, awoked the interest in the haematological response of pacu, Piaractus mesopotamicus. The present work studied the influence of different levels of ascorbic acid (vitamin C) in the ration on the haematological parameters of pacu. Fishes at the beginning of the experiment, presented average body weight 8.64±1.62g and 6.15±0.33cm standard length, were fed with diets containing 0. 50, 100 and 200mg ascorbic acid/kg dry ration. The present work was developed for a period of 24 weeks at the Fish Nutrition Laboratory of Aquaculture Center of Universidade Estadual Paulista (Unesp), Jaboticabal (São Paulo). The fishes were distributed by the completely randomized design in 20...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osteichthyes; Characidae; Piaractus mesopotamicus; Haematology; Vitamin C; Fish.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000300016

Estrutura fina do espermatozóide de Acestrorhynchus falcatus Bloch (Teleostei, Characidae) da região norte do Brasil
Provedor de dados: 104
Autores: Matos,Edilson; Matos,Patricia; Corral,Laura; Azevedo,Carlos.
Spermatozoa of amazon fish, Acestrorhynchus falcatus Bloch, 1794 were investigated by optical microscopy (DIC) and electron microscopy (TEM). Spermatozoa have no acrosome, the head is ovoid, and the midpiece region cylindrical, contains spherical mitochondria. The centriolar complex is located at the lateral side of the nucleus, formed by nine peripheral pairs of microtubules and arranged in a right angle to each other. The flagellum consists of nine pairs of peripheral and two central microtubules.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Teleostei; Characidae; Acestrorhynchus falcatus; Ultrastructure; Spermatozoon.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000300019

Relação peso-comprimento e estrutura da população de nove espécies de Characidae na planície de inundação do Alto Rio Paraná, Brasil
Provedor de dados: 104
Autores: Lizama,Maria de los Angeles Perez; Ambrósio,Angela Maria.
The length/weight relationships are described for Astyanax bimaculatus, A. schubarti, Aphyocharax nasutus, Cheirodon notomelas, Hyphessobrycon callistus, Hemigrammus marginatus, Moenkhausia intermedia, M. sanctae-filomenae and Roeboides paranensis of tropical freshwater fishes in the high Paraná River floodplain. The fishes were caught over a period of 12 month (March 1993 to February 1994). The equations of the length/weight relationships for each species were: Wt=0.0235.Ls3.13; Wt=0.0162.Ls2.89; Wt=0.0179.Ls3.11; Wt=0.0199.Ls3.09; Wt=0.0183.Ls3.10; Wt=0.0140.Ls3.14; Wt= 0.0200.Ls3.21 and Wt=0.0101.Ls3.21, respectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Length/weight relationships; Characidae; Floodplain; Paraná River.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000300015

Características hematológicas do tambaqui Colossoma macropomum Cuvier (Osteichthyes, Characidae) em sistema de monocultivo intensivo: II. Leucócitos
Provedor de dados: 104
Autores: Tavares-Dias,Marcos; Sandrim,Elziane F. Silva; Campos-Filho,Eugênio de.
The leukocytes parameters in approximately one-year-old freshwater fish Colossoma macropomum Cuvier, 1818 (tambaqui) kept in an intensive monobreeding system as well as the correlation among these parameters and the biometric data (total weight and standard length) were investigated. The mean value of the white blood cell count (WBC) in the peripheral blood of tambaqui was 2663.3±1288µl and in the differential count, the following means were observed: neutrophils (1566.2±754µl); lymphocytes (973.6±447µl); monocytes (86.7±123µl) and special granulocitic cells (7.8±144µl). The blood parameters studied were positively correlated among one another, but were negatively correlated with the standard length. However, no correlation was with the weigth of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Colossoma macropomum; Freshwater fish; Leukocytes; Tambaqui.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000100012

Biologia reprodutiva de Astyanax scabripinnis paranae (Eigenmann) (Ostheichthyes, Characidae), do ribeirão das Marrecas, bacia do rio Tibagi, Paraná
Provedor de dados: 104
Autores: Veregue,Angela Maria Louzada; Orsi,Mário Luís.
Some aspects of the reproductive cycle of female "lambari", Astyanax scabripinnis paranae (Eigenmann, 1927) were studied. The specimens were collected in intervals of fifteen days, from September 1979, until November 1980, in the Marrecas creek (Irerê and Paiquerê districts), Londrina, Paraná, Brazil. The maturity scale was characterized in five stages: immature, maturation, spawning, spent, and resting, which was established by the gonad-somatic relation and the ovary morphology and microscopic aspects. The maturation curve and distribution of maturity stages show that the period of reproduction is very long; spawning extended from July to March. The gonad cycle is related to seasons: maturation occurs chiefly in the winter months, spawning specimens are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astyanax scabripinnis; Characidae; Biology; Reproduction; Tibagi river.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000100012

Feeding ecology of Serrapinnus notomelas (Characiformes: Cheirodontinae) in small forest streams in the Machado River basin, Rondônia, Brazil
Provedor de dados: 36
Autores: COSTA,Igor David da; ROCHA,Vanessa Martins da.
ABSTRACT Studies on the trophic structure of fish give information on species autoecology and their role in the ecosystem. The aims of this study were to characterize the diet of Serrapinnus notomelas in small streams of the River Machado basin and to assess the effect of rainfall seasonality. Fish were collected bimonthly from July 2013 to May 2014 with seine nets and hand nets. The length of each specimen was measured to identify category classes. There were also measured the fullness index and volume of each ingested item, and these data were combined to obtain an alimentary index. We used ANOVA and Kruskal-Wallis to test for differences between length classes and fullness index, Chi-squared tests to detect seasonal differences in origin of food items...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Trophic ecology; Igarapés; Ornamental fish; Amazon.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000100019

Seasonality of nematode larvae in Iguanodectes spilurus (Characidae) an ornamental fish from northeastern Para, Brazil
Provedor de dados: 36
Autores: Fujimoto,Rodrigo Yudi; Anjos,Ellem Cristina Silva dos; Ramos,Fabrício Menezes; Martins,Maurício Laterça.
The current study presents a parasitological survey of larval nematodes from freshwater ornamental fish Iguanodectes spilurus caught in the watercourse of the Caete River, in the northeast region of the State of Para, Brazil. A total of 176 specimens, 1.36±0.75 g weight and 5.53±0.98 cm total length, were analyzed. Nematode larvae were identified as Capillaria sp., Procamallanus sp. and Anisakidae, with prevalence of 70.45% and infection intensity ranging from 1.81 to 4.70 larvae. The highest prevalence 57.38% occurred in the liver, but no seasonality was observed, indicating high infection throughout the year. Seasonality was observed in fish parasitized in the stomach, intestine and caecum, with prevalence and mean intensity of 17.61% and 2.32 parasites,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Parasitology; Seasonality; River.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000400013

Comentários sobre a distribuição geográfica de Astyanax altiparanae Garutti &amp; Britski, 2000 (Osteichthyes, Characidae) na bacia do rio Iguaçu
Provedor de dados: 3
Autores: Graça, Weferson Júnio da; UEM; Pavanelli, Carla Simone; UEM.
Garutti (1995) fez a revisão de algumas espécies de Astyanax (Osteichthyes, Characidae) e aquela, conhecida como “tambiú” na bacia do alto rio Paraná, anteriormente identificada como Astyanax bimaculatus, foi considerada nova e posteriormente descrita por Garutti &amp; Britski (2000) como Astyanax altiparanae (Pisces, Characiformes). Naquela oportunidade, entretanto, não foram analisados exemplares da bacia do rio Iguaçu. Esse afluente do rio Paraná apresenta um alto grau de endemismo em sua ictiofauna devido ao isolamento geográfico causado pelas cataratas situadas próximo à sua foz. No entanto, muitas dúvidas relacionadas ao status específico da população da bacia do Iguaçu, também chamada de A. bimaculatus antes dos trabalhos de Garutti, permaneceram....
Palavras-chave: 2.00.00.00-6 Ciências Biológicas Astyanax altiparanae; Distribuição geográfica; Rio Iguaçu; Bacia do alto rio Paraná; Characidae; Tetragonopterinae 2.00.00.00-6 Ciências Biológicas.
Ano: 2002
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2319

Cultivo de matrinxã Brycon orthotaenia (Günther, 1864) em tanques-rede, em diferentes densidades de estocagem - DOI: 10.4025/actascibiolsci.v32i1.3687
Provedor de dados: 3
Autores: Pedreira, Marcelo Mattos; UFVJM; Sampaio, Edson Vieira; CODEVASF - Três Marias; Santos, José Cláudio Epaminondas dos; CODEVASF - Três Marias; Luz, Ronald Kennedy; UFMG.
O presente experimento avaliou o desempenho e sobrevivência de juvenis de matrinxã Brycon orthotaenia cultivados em tanques-rede de 4 m3, por 197 dias, em três densidades de estocagem: 20, 40 e 60 peixes m-3. Foram utilizados exemplares com 19,9 ± 0,3 cm de comprimento total e 90,0 ± 0,15 g de peso. Os animais foram alimentados com ração extrusada contendo 36% de proteína bruta. O comprimento total e o peso foram superiores (p &amp;lt; 0,05) na densidade de 20 peixes m-3. Valores intermediários e inferiores foram registrados para a densidade de 40 e 60 peixes m-3, respectivamente. A sobrevivência e o Fator de condição de Fulton foram semelhantes (p &amp;gt; 0,05) entre as diferentes densidades; porém, a biomassa produzida foi superior (p &amp;lt; 0,05)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.00.00.00-6    Ciências Biológicas rio São Francisco; Characidae; Tanques-rede; Espécie neotropical; Matrinxã 5.06.03.00-0 São Francisco river; Characidae; Floating Cage; Neotropical fish; Matrinxã.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/3687

Stream fish from recently deforested basins in the Meridional Amazon, Mato Grosso, Brazil
Provedor de dados: 49
Autores: Casatti,Lilian; Brejão,Gabriel Lourenço; Carvalho,Fernando Rogério; Silva,Hugmar Pains da; Pérez-Mayorga,María Angélica; Manzotti,Angelo Rodrigo; Zeni,Jaquelini de Oliveira; Ramires,Bruno Martins Santos; Langeani,Francisco.
Abstract: The replacement of tropical forests to production systems is one of the leading causes of riverine ecosystem alterations. However, current assemblages’ composition may also result from the time since these transformations have begun. Therefore, the knowledge of diversified historical scenarios can facilitate the accomplishment of actions that involve the aquatic environments recovery. In this study, an inventory of stream fish was carried out in basins whose deforestation was intensified in the last 20 years, to compose a baseline for ecological and taxonomic studies. The habitat, physical and chemical variables, and the fish assemblages from 60 streams in the northwest region of the state of Mato Grosso, in the Aripuanã and Juruena river basins,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inventory; Neotropical ichthyofauna; Deforestation; Baseline; Characidae.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100309

Fishes community composition and patterns of species distribution in Neotropical streams
Provedor de dados: 49
Autores: Cavalheiro,Laísa Wociechoski; Fialho,Clarice Bernhardt.
Abstract: The ichthyofauna of streams in the Neotropical region is not yet fully known. This study aims to investigate the ichthyofauna composition of six streams of the Ijuí River sub-basin, Rio Grande do Sul State, inserted in the Uruguay River basin, as to contribute to the knowledge of fishes species richness and distribution in the south of Brazil. Sampling was carried out between July 2015 and May 2016, bimonthly, using the technique of electric fishing to collect the fishes. Spatial variations (per sampled stream) in the ichthyofauna composition were tested with a permutational multivariate analysis of variance. In total, we collected 5,029 individuals from 55 species, 13 families and five orders. From these species, 17 are endemic to the Uruguay...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Characidae; Heptapteridae; Loricariidae; Richness; Uruguay River basin.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100302

Nuclear-follower foraging associations among Characiformes fishes and Potamotrygonidae rays in clean waters environments of Teles Pires and Xingu rivers basins, Midwest Brazil
Provedor de dados: 49
Autores: Garrone Neto,Domingos; Carvalho,Lucélia Nobre.
During under and overwater observations were recorded nuclear-follower foraging associations among three species of characiform fishes - Chalceus epakros, Hemiodus semitaeniatus and Hemiodus unimaculatus - and a freshwater stingray species - Potamotrygon orbignyi - in the Teles Pires and Xingu rivers basins, Midwest Brazil. The teleost fishes were observed closely following the stingrays during the behavior of stirring the substrate to uncover invertebrates, which cause discrete sediment clouds. Apparently this sediment perturbation attracts the fishes that approached the foraging stingrays to feed on small preys and other food types exposed this way. This is a typical example of a commensal relationship in which one participant is benefited while the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Following behavior; Foraging habits; Interespecific interactions; Characidae; Hemiodontidae; Amazon Basin.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000400030

Population structure of two Astyanax Baird &amp;amp; Girard, 1854 (Teleostei, Characidae) species from upper Paraguaçu river
Provedor de dados: 52
Autores: Santos,Alexandre Clistenes de Alcântara; Novaes,José Luís Costa.
The fishes of the family Characidae are among the main species of fresh water fishes in South America. In this work, some aspects of the population structure of two Astyanax species were assessed. The fishes were caught in Santo Antônio and São José rivers, in the Paraguaçu basin, by standardized monthly samplings adapted to the microhabitats. Astyanax sp. b (São José river) presented larger size than Astyanax sp. a (Santo Antônio river). The length-weight relationship showed positive allometric growth for Astyanax sp. a, and negative for Astyanax sp. b. Both the species showed a long reproductive period, with higher activities in dry period.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astyanax; Characidae; Chapada Diamantina; Paraguaçu River; Population structure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100013

Feeding of Acestrorhynchus lacustris (Characidae): a post impoundment studies on Itaipu reservoir, upper Paraná River, PR
Provedor de dados: 52
Autores: Hahn,Norma Segatti; Delariva,Rosilene Luciana; Loureiro,Valdirene Esgarbosa.
With objective to know feeding spectrum of Acestrorhynchus lacustris (Reinhardt, 1874), a middle size predator in different places of influence area of Itaipu reservoir, stomach contents were analyzed. Samples were collected from March 1984 to February 1989 from Itaipu Reservoir and its adjacent areas. Its fed mainly on fishes, but it was an opportunistic (consumed 17 species of prey). Despite of the wide feeding spectrum, few preys were dominant in the diet, according to the different habitats sampled. As a result, it significant spatial differences in the diet was observed. Was observed through "Detrented Correspondence Analysis" (DCA) these were divided into three groups in relation with diet: preys from upstream, with higher scores; preys from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding; Predation; Characidae; Upper Paraná River; Itaipu Reservoir.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000200010

Effectiveness of estradiol valerate on sex reversion in Astyanax altiparanae (Characiformes, Characidae)
Provedor de dados: 52
Autores: Bem,Jaqueline Cristina de; Fontanetti,Carmem Silvia; Senhorini,José Augusto; Parise-Maltempi,Patricia Pasquali.
The objective of this study was to evaluate the effectiveness of estradiol valerate in an attempt to feminize the male Astyanax altiparanae. One thousand newly-hatched larvae were randomly distributed in four incubators. During a period of 30 days, estradiol valerate was administered in different dosages (20, 40, and 80 mg/kg of diet); the control group did not receive hormone in the diet. After 161 days of hatching, biometry was performed on 50 fishes per treatment group, and the gonads were analyzed. The hormone treatments were effective in feminizing A. altiparanae, achieving 70-76% of the desired sex, while the control treatment had 44% females. The hormone did not affect the growth of fish.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astyanax altiparanae; Characidae; Feminization; Sex Reversion; Estrogen.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200015

Occurrence of intersexuality in " Lambaris" , Astyanax scabripinnis (Jenyns, 1842), small characids from the Brazilian streams
Provedor de dados: 52
Autores: Sá,Maria de Fátima Pereira de; Fragoso-Moura,Evelise Nunes; Fenerich-Verani,Nelsy; Ferro,Dagmar Aparecida de Marco.
During studies carried out with a small characid (Astyanax scabripinnis), from the Brazilian streams located in Cerrado biome, some gonads of fishes exhibited sparse oocytes in perinucleolar stage embedded in normally developing testicular tissues. Another pattern of gonad intersex with vitellogenic oocytes and mature lobules was observed in the gonads of fishes collected from a reservoir supplied by the Atlantic Forest stream. These gonads in different stages of maturation were examined histologically. The results revealed the patterns occurring in fishes of the same species, from four different populations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intersexuality; Neotropical ichthyofauna; Characidae; Tetras; Stream fishes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000200011

Descrição de Astyanax argyrimarginatus sp. n. (Characiformes, Characidae) procedente da bacia do Rio Araguaia, Brasil
Provedor de dados: 57
Autores: GARUTTI,V.
Descreve-se uma espécie nova para o gênero Astyanax Baird &amp;amp; Girard. A. argyrimarginatus procede da bacia do Rio Araguaia, Brasil. Esta espécie pode ser identificada por possuir uma mancha umeral negra horizontalmente ovalada, uma mancha negra no pedúnculo caudal, que se estende à extremidade dos raios caudais medianos, duas barras verticais castanho-escuras na região umeral e uma faixa lateral negra conspícua, bordeada por uma estreita faixa prateada. São discutidos outros caracteres que distinguem a espécie nova das demais espécies do gênero Astyanax portadoras de uma mancha umeral horizontalmente ovalada.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astyanax argyrimarginatus sp. n.; Characidae; Tetragonopterinae; Taxonomia; Descrição; Rio Araguaia; Brasil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400008