Consulta: subjectFacets:"Siluriformes"
Registros recuperados: 45
Data/hora: 13/06/2024 05:09:05

Relative abundance and autecology of three piscivorous fishes in lakes of the upper basin of Salado River (Buenos Aires Province, Argentina)
Provedor de dados: 67
Autores: Barla,María J; Vera,María S; O'Brien,Emma D.
The Salado River is an important watercourse in northern Pampean region of Argentina which includes several lakes in the upper part of its basin. This upper part shows lesser fish species richness than the lower section of the river. In this paper, an analysis of community structure of secondary and tertiary consumers and its autecology are presented. Among the 14 fish species recorded, 3 were mainly or totally piscivorous as adults. They constituted 11.4% of the numeric abundance and 10.8% of the biomass. Their numeric abundance was 89% (Oligosarcus jenynsii), 11% (Rhamdia sapo), and 0.5% (Hoplias malabaricus malabaricus), and their relative biomass was 61%, 33%, and 6%, respectively. Length/weight ratio, condition factor, and cephalic index indicate that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characiformes; Siluriformes; Predation; Biocenology; Lentic environments; Pampean lakes; Trophic levels.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2003000200009

ESTUDIO COMPARATIVO DE OVARIOS Y CUBIERTAS OVOCITARIAS EN PECES SILURIFORMES DE AGUAS CONTINENTALES DE CHILE
Provedor de dados: 72
Autores: Huaquín,Laura G.; Veliz,Dina; Arratia,Gloria.
El conocimiento de la estructura ovárica permite analizar la capacidad desovante, duración, temporalidad y forma en que se realiza esta función reproductiva. Se describen y analizan aspectos estructurales de las cubiertas ovocitarias de 2 especies de Siluriformes Nematogenys inermis especie considerada en peligro de extinción y de Trichomycterus areolatus, la más abundante y de mayor distribución en Chile continental. Cortes histológicos de 6 mm de ovarios fijados en Bouin fueron teñidos con HE, Azán, Van Gieson, Alcian Blue y PAS. El estudio histológico muestra la pared del ovario formada por el peritoneo externo, una túnica media y el epitelio ovárico. Desde la túnica se proyectan hacia el interior, láminas de tejido conectivo que van a constituir el...
Tipo: Journal article
Palavras-chave: Histología; Cubiertas ovocitos; Siluriformes.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200026

Genetic diversity of Hypostomus ancistroides (Teleostei, Loricariidae) from an urban stream
Provedor de dados: 74
Autores: Sofia,Silvia H.; Galindo,Bruno A.; Paula,Francine M.; Sodré,Leda M.K.; Martinez,Cláudia B.R.
In this study, random amplified polymorphic DNA (RAPD) markers were applied to analyze the genetic diversity of samples of the Neotropical catfish Hypostomus ancistroides, collected from four sites (S1, S2, S3 and S4) along an urban stream in Southern Brazil. The 11 primers used in RAPD analysis amplified 147 loci, 76 (51.7%) of which were polymorphic. The proportions of polymorphic loci observed in the four samples were: 29.93% (S1), 31.97% (S2), 23.81% (S3) and 38.77% (S4). The average heterozygosity within sampling localities ranged from 0.1230 to 0.1526 and unbiased genetic distances ranged from 0.0253 to 0.0445. AMOVA partitioned 90.85% of the total variation within samples and 9.15% among samples. Excepting for the sample pair S1-S2 (phiST = 0.02784;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Loricariid fish; Genetic diversity; RAPD; Siluriformes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200027

Cytogenetic studies in fishes of the genera Hassar, Platydoras and Opsodoras (Doradidae, Siluriformes) from Jarí and Xingú Rivers, Brazil
Provedor de dados: 74
Autores: Milhomem,Susana Suely Rodrigues; Souza,Augusto Cesar Paes de; Nascimento,Aline Lira do; Carvalho Jr.,Jaime Ribeiro; Feldberg,Eliana; Pieczarka,Julio Cesar; Nagamachi,Cleusa Yoshiko.
We studied the karyotypes of Hassar cf. orestis and an undescribed Hassar species from the Jarí River and Opsodoras ternetzi, H. orestis and Platydoras cf. costatus from the Xingú River, all with 2n = 58. Constitutive heterochromatin is located in the centromere in most metacentric pairs; in some chromosomes this banding is not present, or it is located on the whole chromosome arm or in the distal regions. The NOR is located on a single biarmed pair at a distal region of the short arm in H. cf. orestis, H. orestis and P. cf. costatus at a distal region of the long arm in O. ternetzi and at a proximal region of the long arm in the Hassar species. In all species (except for Hassar sp.) the CMA3 analysis revealed a rich G-C region coincident with the NOR....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Amazon; Biodiversity; Siluriformes; Banding; Fluorochromes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200017

Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae)
Provedor de dados: 74
Autores: Margarido,Vladimir Pavan; Moreira-Filho,Orlando.
The Neotropical Heptapteridae fish Imparfinis hollandi, endemic to the Iguaçu River Basin (Brazil), was cytogenetically analyzed and the diploid chromosome number of 2n = 42 chromosomes was determined (22m + 10sm + 10st), the lowest diploid number in this genus and family. Like other Heptapteridae species, only one NOR-bearing chromosome pair was detected by silver nitrate staining. Dark heterochromatic blocks were visualized in only three chromosome pairs, and chromomycin A3+ bands were coincident with Ag-NORs. Although no intercalary (TTAGGG)n sequence was observed through FISH with a telomere probe, an asymmetric karyotype showing four large chromosome pairs with diploid chromosome number reduction suggests that tandem chromosome fusions probably...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Chromosome banding; Chromosomal rearrangements; (TTAGGG)n.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200012

Karyotype and nuclear DNA content of Trichomycterus areolatus (Siluriformes, Trichomycteridae)
Provedor de dados: 74
Autores: Colihueque,Nelson; Corrales,Olga; Parraguez,Margarita.
Cytogenetic analysis of Trichomycterus areolatus, collected from the Tijeral and Huilma Rivers in southern Chile has shown a diploid chromosome number of 2n = 54, a fundamental number of FN = 106, and a karyotypic formula of 44m + 8sm + 2st. Intra-individual polymorphism of chromosome number (2n = 54, 55 and 56) in specimens from the Huilma River has also been documented, providing further evidence of the occurrence of this phenomenon in Trichomycterus. The karyotype exhibited large chromosome pairs: metacentric pairs 1 (relative length 7.54%), 2 (5.75%) and 3 (5.09%), submetacentric pair 23 (5.25%), and subtelocentic pair 27 (5.28%). Nuclear DNA content analysis showed an average value of 5.04 ± 1.09 pg/nucleus. This DNA content is higher than the mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype; Nuclear DNA content; Trichomycterus; Siluriformes.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200014

Cytogenetic analyses of two endemic fish species from the São Francisco River basin: Conorhynchus conirostris and Lophiosilurus alexandri (Siluriformes)
Provedor de dados: 74
Autores: Marques,Marilza Barbosa de Almeida; Moreira-Filho,Orlando; Garcia,Caroline; Margarido,Vladimir Pavan.
Two Siluriformes species endemic to the São Francisco River basin were characterized by conventional and differential cytogenetic analyses involving C-banding, Ag-nucleolar organizer region (NOR) and chromomycin A3 (CMA3) staining, and FISH (fluorescent in situ hybridization) with 18S and 5S rDNA probes. Conorhynchus conirostris presents a higher diploid number (2n = 60) than those detected in Pimelodidae representatives, whereas Lophiosilurus alexandri, with a karyotype of 2n = 54 chromosomes, presents a chromosomal constitution similar to that found in the family Pseudopimelodidae. Plesiomorphic characteristics such as single NORs at terminal positions are found in both species, as revealed by CMA3 and silver nitrate staining, and FISH with a 18S rDNA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Incertae sedis; Pimelodidae; Pseudopimelodidae; RDNA; Siluriformes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200008

Homoplasies, Consistency Index and the Complexity of Morphological Evolution: Catfishes as a Case Study for General Discussions on Phylogeny and Macroevolution
Provedor de dados: 77
Autores: Diogo,Rui.
Catfishes constitute a highly diversified, cosmopolitan group that represents about one third of all freshwater fishes and is one of the most diverse Vertebrate taxa. The detailed study of the Siluriformes can, thus, provide useful data, and illustrative examples, for broader discussions on general phylogeny and macroevolution. In this short note I briefly expose how the study of this remarkably diverse group of fishes reveals an example of highly homoplasic, complex 'mosaic' morphological evolution
Tipo: Journal article
Palavras-chave: Catfishes; Homoplasies; Morphological macroevolution; Phylogeny; Siluriformes; Teleostei.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400024

Osteology and Myology of the Cephalic Region and Pectoral Girdle of Heptapterus mustelinus, Comparison With Other Heptapterins, and Discussion on the Synapomorphies and Phylogenetic Relationships of the Heptapterinae and the Pimelodidae (Teleostei: Siluriformes)
Provedor de dados: 77
Autores: Diogo,Rui.
The cephalic and pectoral girdle structures of the heptapterin Hepapterus mustelinus (Nemuroglanis clade') are described and compared to those of two representatives of the other, more plesiomorphic, main heptapterin group, namely Goeldiella eques and Rhamdia guatemalensis ('basal clade'), as well as of several other catfishes, as the foundation for a discussion on the synapomorphies and phylogenetic relationships of the Heptapterinae. In addition to the five synapomorphies commonly referred in the literature, there is another potential Heptapterinae synapomorphy: the well-developed maxilla forming a completely closed, deep tube to enclose the base of the maxillary barbel. The subfamilies Pimelodinae, Heptapterinae and Pseudopimeodinae seem to form a...
Tipo: Journal article
Palavras-chave: Catfish; Heptapterinae; Morphology; Phylogeny; Pimelodidae; Siluriformes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400011

Osteology and Myology of the Cephalic Region and Pectoral Girdle of Pangasius macronema, With a Discussion on the Synapomorphies and Phylogenetic Relationships of the Pangasiidae (Teleostei: Siluriformes)
Provedor de dados: 77
Autores: Diogo,Rui.
The cephalic and pectoral girdle structures of Pangasius macronema are described and compared with those of another representative of the same genus, Pangasius larnaudii, and of representatives of the other pangasiid genus, Helicophagus leptorhynchus and Helicophagus typus, as well as of several other catfishes, as the foundation for a discussion of the synapomorphies and phylogenetic relationships of the Pangasiidae. The following two features could constitute Pangasiidae autapomorphies: 1) presence of prominent crest on the dorso-lateral surfaces of both the hyomandibulo-metapterygoid and the ento-ectopterygoid; 2) presence of a large, circular foramen between the anterodorsomedial surface of the extrascapular, the dorsomesial surface of the pterotic and...
Tipo: Journal article
Palavras-chave: Catfish; Helicophagus; Pangasius; Pangasiidae synapomorphies; Morphology; Phylogeny; Siluriformes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300001

Cordelia's Dilemma, Historical Bias, and General Evolutionary Trends: Catfishes as a Case Study for General Discussions on Phylogeny and Macroevolution
Provedor de dados: 77
Autores: Diogo,Rui.
As noted Gould in his recent and last book «The structure of evolutionary theory», discourses on the high importance and frequency of evolutionary trends have consumed a great part of the research on the history of clades. Although aware that natural selection theoretically yields adaptation to immediate environments, many authors defend such trends as generalised improvements somehow conferring advantages across most or all experienced environments. The high importance given to evolutionary trends is questioned by Gould, who considers that such a high importance given to such evolutionary trends bears no necessary relationship to the relative frequency or casual weight of these events in evolution, but mainly to a major bias: trends tell histories, and...
Tipo: Journal article
Palavras-chave: Evolution; Morphology; Phylogeny; Siluriformes; Teleostei.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500016

Lithoxus stocki, a species new to science of ancistrin loricariid catfish from the Maroni River drainage, with a comparison of the primary type specimens of the six species of Lithoxus (syn.: Paralithoxus) (Pisces, Siluriformes, Loricariidae)
Provedor de dados: 16
Autores: Nijssen, Han; Isbrücker, Isaäc J.H.
Lithoxus stocki, a catfish species new to science from the Maroni River drainage in French Guiana and Surinam is described. A lectotype is designated for Lithoxus bovallii. Morphometric and meristic characters of the six species of the genus are provided. Paralithoxus, originally proposed as a subgenus of Lithoxus, is relegated to the synonymy of Lithoxus.
Tipo: Article / Letter to the editor
Palavras-chave: Siluriformes; Lithoxus; French Guiana; Surinam.
Ano: 1990
URL: http://www.repository.naturalis.nl/record/504531

The dawn of phylogenetic research on Neotropical fishes: a commentary and introduction to Baskin (1973), with an overview of past progress on trichomycterid phylogenetics
Provedor de dados: 83
Autores: de Pinna,Mário C. C.
ABSTRACT A review is made of the impact of the landmark Ph. D. Thesis of Jonathan N. Baskin from 1973 on the development of the phylogenetics of catfishes and some of its main subgroups and on neotropical ichthyology in general. Baskin's work is the first to propose a hypothesis of relationships for loricarioid catfishes and for the family Trichomycteridae on the basis of explicit Hennigian principles. It is arguably also the first application of phylogenetic methods to any group of neotropical fishes. The hypotheses presented by Baskin covered the monophyly of Siluriformes, the monophyly and relationships of loricarioid families and the relationships of Trichomycteridae (including the monophyly of the family and the relationships among its constituent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candiru; Cladistics; Catfishes; Siluriformes; Trichomycteridae.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200219

Redescription of Hisonotus notatus Eigenmann &amp;amp; Eigenmann, 1889 (Loricariidae: Hypoptopomatinae), the type species of the genus, and description of a new species from coastal drainages of southeastern Brazil
Provedor de dados: 83
Autores: Martins,Fernanda O.; Langeani,Francisco.
ABSTRACT Our analyses showed that the type series of Hisonotus notatus , type species of the genus, is mixed, composed by two different species. Based on that, we redescribe H. notatus with the designation of a lectotype, restricting the species to rio São João drainage and other small coastal drainages running to the Baía de Guanabara and to the Baía de Sepetiba in Rio de Janeiro State. We also describe a new species of Hisonotus from drainages of the rio Paraíba do Sul, Lagoa Feia, rio Macaé, and coastal rivers of Espírito Santo State, from rio Itabapoana to rio Doce basin. These two species are sister-taxa and can be distinguished by the number of plates in the mid-dorsal series.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Cascudinhos; Lectotype; Siluriformes; Taxonomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200218

Fallen leaves on the water-bed: diurnal camouflage of three night active fish species in an Amazonian streamlet
Provedor de dados: 83
Autores: Sazima,Ivan; Carvalho,Lucélia Nobre; Mendonça,Fernando Pereira; Zuanon,Jansen.
Resemblance to dead leaves is a well known type of camouflage recorded for several small vertebrates that dwell in the leaf and root litter on the ground. We present here instances of such resemblance in three species of nocturnal fishes (Siluriformes and Gymnotiformes) that spend the daytime among submersed root-tangle with leaf litter in Amazonian streams. All three species are very difficult to spot visually, due both to their shape and colors which blend with the substrate, as well as to the heterogeneous nature of their cover. Two species were recorded to lie on their sides, which adds to their resemblance to dead leaves. When disturbed, one species may drift like a waterlogged leaf, whereas another moves upwards the root-tangle, exposing its fore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crypsis; Leaf resemblance; Defence against predators; Siluriformes; Gymnotiformes.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100013

Microsatellite loci development for three catfish species from northwestern South America
Provedor de dados: 83
Autores: Restrepo-Escobar,Natalia; Márquez,Edna J.
ABSTRACT The Neotropical catfish species Ageneiosus pardalis, Pimelodus grosskopfii, and Sorubim cuspicaudus are important fishery resources in Colombia that show historical declines in their capture. This study used next-generation sequencing with 454 FLX technology (Roche Applied Science) and bioinformatics analysis to develop between 18 and 24 microsatellite loci for these species. The novel microsatellite loci showed high values of polymorphic information content -PIC (A. pardalis: 0.601-0.903, P. grosskopfii: 0.748-0.946 and S. cuspicaudus: 0.383-0.876), and the average number of alleles/locus ranged from 7-15 for A. pardalis, 9-30 for P. grosskopfii and 5-14 for S. cuspicaudus. The average observed and expected heterozygosities were respectively,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater fish; Molecular markers; Next-generation sequencing; Siluriformes.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100210

Seasonal changes in the gonadossomatic index, allometric condition factor and sex ratio of an auchenipterid catfish from eastern Amazonia
Provedor de dados: 83
Autores: Freitas,Tiago Magalhães da Silva; Almeida,Vitor Hudson da Consolação; Montag,Luciano Fogaça de Assis; Rocha,Rossineide Martins da; Fontoura,Nelson Ferreira.
The aim of the present study was to evaluate the seasonal pattern of the gonadosomatic index (GSI), condition factor (K), and sex ratio in the catfish Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) as an approach to identify its reproductive period. A total of 589 A. longimanus specimens (251 males and 338 females) were captured in the rivers of the Caxiuanã National Forest, in the Brazilian state of Pará, between July, 2008 and July, 2009. Among the male specimens, 171 were classified as adults and 80 as juveniles, while there were 249 adults and 89 juvenile females. Using a sinusoidal equation, analysis of the GSI revealed a reproductive asynchrony between the genders, with males attaining their highest GSI values in January, while females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Auchenipterichthys longimanus; Hydrological seasons; Reproduction; Siluriformes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400015

Two new species of Hypostomus Lacépède (Teleostei: Loricariidae) from the upper rio Paraná basin, Central Brazil
Provedor de dados: 83
Autores: Zawadzki,Cláudio H.; Weber,Claude; Pavanelli,Carla S.
Two new species of Hypostomus Lacépède (Teleostei: Loricariidae) from the rio Paranaíba and rio Grande basins, both in the upper rio Paraná basin, central Brazil, are described herein. One of them is distinguished from all congeners, except H. albopunctatus, by having the pectoral-fin spine length equal to or smaller than the pelvic-fin spine. From H. albopunctatus, it is distinguished by having round dark spots (vs. pale) on body and fins. The second species is distinguished from all congeners, except H. multidens and H. ternetzi, by having more than 115 teeth (vs. less than 109) per ramus on dentary and premaxilla. It is distinguished most readily from H. ternetzi by having teeth with two symmetrical (vs. asymmetrical) cusps. It is distinguished from H....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catfishes; Neotropical fishes; Siluriformes; Taxonomy.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000300013

Population genetics of three threatened catfish species in heterogeneous environments of the Cauca River, Colombia
Provedor de dados: 83
Autores: Restrepo-Escobar,Natalia; Yepes-Acevedo,Anny Johanna; Márquez,Edna Judith.
ABSTRACT Neotropical catfishes Ageneiosus pardalis, Pimelodus grosskopfii and Sorubim cuspicaudus are migratory fishes of commercial importance that exhibit decreasing populations due to overfishing and other anthropic interventions. This study used species-specific microsatellite loci to test the hypothesis that threatened fish populations show genetic vulnerability signs and are genetically structured in the middle and lower sections of the Cauca River. The studied species exhibit genetic diversity levels higher than the average values reported for Neotropical Siluriformes; however, they seem to have suffered recent bottlenecks and they present significant endogamy levels that are higher for the critically endangered catfish P. grosskopfii. Furthermore,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater fish; Genetic diversity; Genetic structure; Microsatellites; Siluriformes.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100204

A new species of the catfish Neoplecostomus (Loricariidae: Neoplecostominae) from a coastal drainage in southeastern Brazil
Provedor de dados: 83
Autores: Cherobim,Arieli Matheus; Lazzarotto,Henrique; Langeani,Francisco.
ABSTRACT A new species of loricariid catfish is described from the rio Perequê-Açú and surrounding basins, Parati, Rio de Janeiro State. The new species has the accessory process of ceratobranchial 1 more slender than the main body of the ceratobranchial, and a very large sesamoid ossification, markedly greater in size than the interhyal. Additionally, the new species presents a distinct dorsal color pattern consisting of a conspicuous horseshoe shaped light blotch with a central dark area posterior to the supraoccipital.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cascudos; Neoplecostomus microps; Perequê-Açú; Siluriformes; Taxonomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000400204

Scoloplax baskini: a new spiny dwarf catfish from rio Aripuanã, Amazonas, Brazil (Loricarioidei: Scoloplacidae)
Provedor de dados: 83
Autores: Rocha,Marcelo Salles; Oliveira,Renildo Ribeiro de; Py-Daniel,Lúcia H. Rapp.
A new species of Scoloplax is described from small tributaries of rio Aripuanã, rio Madeira drainage, Amazonas State, Brazil. The new species can be distinguished from its congeners by several morphological features, such as ventral midline plates with two longitudinal parallel rows of odontodes not covered by skin, pectoral and pelvic fins with all rays simple, unbranched, and mesethmoid with a thickened triangular anterior process. Implications of new records of S. dolicholophia from rio Japurá and other comparative features within the genus are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; Neotropical; Systematics; Siluriformes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000300005

Genetic variability in four samples of Neoplecostomus yapo (Teleostei: Loricariidae) from the rio Paranapanema basin, Brazil
Provedor de dados: 83
Autores: Philippsen,Juliana S.; Renesto,Erasmo; Gealh,Ana Maria; Artoni,Roberto F.; Shibatta,Oscar A.; Zawadzki,Claudio H.
Four samples of Neoplecostomus yapo were analyzed through the allozyme electrophoresis technique in corn starch gel. The allozyme pattern was similar to those found in N. paranensis with 24 loci scored. Two samples (ribeirão Atlântico and ribeirão Uraí) showed monomorphic bands for all 24 loci, whereas the other two (rio Verde and rio Fortaleza) showed 8.3% of polymorphic loci. The He genetic variability estimates for the rios Verde and Fortaleza populations were 0.0195 and 0.0179, respectively, too much inferior to the mean heterozygosity summed to species from the whole world (0.051). The Wright statistical values F IS = 0.5181, F IT = 0.5681 and F ST = 0.1039 and the genetic distance of Nei values showed that the four samples are genetically very...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allozymes; Genetic variation; Neoplecostominae; Neotropical fishes; Siluriformes.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000100004

A new species of Parotocinclus with reduced adipose fin (Loricariidae: Hypoptopomatinae), from the rio Jacuípe basin, Bahia State, Brazil
Provedor de dados: 83
Autores: Silva-Junior,Dario Ernesto da; Ramos,Telton Pedro Anselmo; Zanata,Angela Maria.
ABSTRACT A new species of Parotocinclus, apparently endemic to the rio Jacuípe basin, Bahia State, Brazil, is described. The new species is distinguished from congeners, except P. bidentatus, P. cabessadecuia, P. dani, P. halbothi, P. muriaensis, P. pentakelis, P. seridoensis, and P. spilurus, by the presence of a reduced adipose fin. The new species differs from the aforementioned species by the absence of unicuspid accessory teeth, abdomen with broad naked areas between lateral and medial patches of plates, and snout tip completely covered by plates and odontodes. The adipose fin of the new species is restrict solely to the adipose-fin spine, lacking the adipose-fin membrane, a reduction pattern previously described to P. halbothi, a congener from rivers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cascudinho; Catfishes; Northeastern Mata Atlântica freshwater ecoregion; Siluriformes; Taxonomy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200207

Feeding habits and morphometry of Iheringichthys labrosus (Lütken, 1874) in the Uruguay River (Uruguay)
Provedor de dados: 83
Autores: Masdeu,Malvina; Mello,Franco Teixeira-de; Loureiro,Marcelo; Arim,Matias.
Body size and diet of organisms are fundamental attributes which determine their ecology and natural history. Iheringichthys labrosus is one of the most common fish species of the Uruguay River. However, its natural history is poorly known and there is little information about its diet and interactions with other species. This paper describes the feeding habits of this species, relating feeding patterns to the size classes and morphometry of individuals and to the temporal variations. Fishes were captured in May and November of 2006 in three zones of the lower Uruguay River. A total of 101 stomach contents was analyzed (standard length: 60-224 mm). The species exhibited a broad feeding spectrum with most items belonging to the benthic community. We found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Freshwater; Natural history; Pimelodidae; Siluriformes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300019

A new spiny species of Hypostomus Lacépède (Loricariidae: Hypostominae) from thermal waters, upper rio Paraná basin, central Brazil
Provedor de dados: 83
Autores: Martins,Fernanda O.; Langeani,Francisco; Zawadzki,Cláudio H.
A new species of Hypostomus is described from the rio Quente, rio Paranaíba drainage, in the upper rio Paraná basin in central Brazil. The rio Quente is a peculiar small and shallow fast water stream with water temperatures around 34ºC. The new species is distinguished from all congeners by having the five lateral series of plates with hypertrophied odontodes not aligned in rows and more conspicuous on flanks of caudal peduncle of the larger specimens. The new species is only known from the rio Quente.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater fishes; Neotropical region; Rio Quente; Siluriformes; Taxonomy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000400729

New data on cistern catfish, Phreatobius cisternarum, from subterranean waters at the mouth of the Amazon River (Siluriformes, Incertae Sedis)
Provedor de dados: 84
Autores: Muriel-Cunha,Janice; Pinna,Mário de.
Data on new specimens of the rare subterranean catfish Phreatobius cisternarum are reported. Specimens were collected from hand-dug wells in the region of the mouth of the Amazon river, Brazil. A revised diagnosis of Phreatobius is proposed, and P. cisternarum is redescribed on the basis of new and previously available material. Included are data on coloration, both in life and preserved, SEM observations of external morphology, morphometric and meristic data. One juvenile specimen, the first known of the species, is reported and illustrated. The new and previously available material reveal considerable intraspecific variation in several morphological traits of P. cisternarum. Despite its rarity in collections, P. cisternarum seems to be common in wells in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phreatobius cisternarum; Siluriformes; Subterranean fishes; Fish ecology; Feeding habits; Behavior; Taxonomy.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492005002600001

Redescrição de Genidens barbus (Lacépède, 1803) e Genidens machadoi (Miranda-Ribeiro, 1918), Bagres Marinhos (Siluriformes, Ariidae) do Atlântico Sul Ocidental
Provedor de dados: 84
Autores: Marceniuk,Alexandre P.
A variação no padrão das placas de dentes vômero-palatinas de Genidens barbus e Genidens machadoi é revista e as espécies redescritas com base na análise de 46 caracteres morfológicos. Genidens machadoi pode ser diferenciada de Genidens barbus pela: margem lateral do esfenótico recortada (vs. margem lateral do esfenótico retilínea); escudo cefálico mais estreito na região dos esfenóticos (vs. escudo cefálico mais estreito na região dos frontais); distância entre a margem lateral do escudo cefálico, na porção mais estreita, e a margem posterior da órbita cabendo 0,681,0 na menor largura do escudo cefálico (vs. 1,21,7); menor largura do processo occipital, na porção posterior, cabendo 2,03,4 no comprimento do processo occipital (vs. 3,34,7); um ou dois pares...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Ariidae; Genidens barbus; Genidens machadoi; Atlântico Sul Ocidental.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492005001100001

Descripción de una nueva especie de bagre marino fósil (Teleostei, Siluriformes, Ariidae) del Mioceno de la provincia de Río Negro, Argentina
Provedor de dados: 84
Autores: Bogan,Sergio; Agnolin,Federico L.
En este trabajo se describen dos cráneos de la familia Ariidae procedentes del miembro Saladar de la Formación Gran Bajo del Gualicho, ubicados en las Salinas del Gualicho, provincia de Río Negro, Argentina. La edad de los depósitos del Miembro Saladar se remonta al Mioceno Temprano alto/Mioceno Medio bajo. Los materiales son asignados a una nueva especie extinta del género viviente Genidens. Este nuevo taxón se distingue de todas las especies actuales por presentar un proceso supraoccipital muy corto, ancho y redondeado, extraescapular subcircular y mesetmoides amplios con una conspicua escotadura mesial, frontales prácticamente planos en vista lateral y margen lateral de los huesos esfenóticos rectilíneo. Genidens sp. nov., representa el registro más...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Ariidae; Genidens; Formación Gran Bajo del Gualicho; Patagonia.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011002500001

Use of food resources and resource partitioning among five syntopic species of Hypostomus (Teleostei: Loricariidae) in an Atlantic Forest river in southern Brazil
Provedor de dados: 103
Autores: Abilhoa,Vinicius; Valduga,Marcos O.; Frehse,Fabricio de A.; Vitule,Jean R.S.
ABSTRACT We analyzed the diet and resource partitioning among five syntopic species of Hypostomus Lacépède, 1803 in the Corumbataí River in southeastern Brazil. The gut contents of 352 individuals were assessed and 21 food items were identified and quantified under an optical microscope. The food items found in the gut contents indicate that these suckermouth loricariids are bottom-dwelling detritivorous/periphytivorous catfishes. PERMANOVA and SIMPER analyses indicated variation in the consumption of some resources, and the contribution of periphytic algae was primarily responsible for such dissimilarity. ECOSIM analyses of dietary overlap showed evidence of resource sharing among all species in the dry and rainy periods. This is most likely the result of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Armoured catfish; Feeding; Food overlap; Periphyton; Siluriformes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000600700

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

Desempenho e coeficiente intestinal de alevinos puros e híbridos de pintados em condicionamento alimentar
Provedor de dados: 96
Autores: Barbosa,Osvaldo Nunes; Raizer,Josué; Gonda,Mario Fabiano; Silva,Jesiel Mamedes.
Avaliou-se neste estudo o desempenho de alevinos de pintado puros Pseudoplatystoma corruscans e híbridos em treinamento alimentar. O coeficiente intestinal (CI = comprimento do intestino/comprimento total do animal) foi relacionado à massa e ao volume e comparado por meio de análise de variância multivariada e de componentes principais. Conforme a rotina da estação de piscicultura, a duração do condicionamento alimentar é de aproximadamente 60 dias, quando os animais são condicionados a alimentação com ração seca extrusada durante a fase clara do dia. Foram coletados cerca de 100 animais por grupo nas etapas inicial, intermediária e final. No início, os animais receberam coração bovino triturado e gradativamente foi adicionada ração moída até a aceitação...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptação intestinal; Condicionamento alimentar; Crescimento; Peixes carnívoros; Peixes neotropicais; Siluriformes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001200001

Estimation of jundiá (Rhamdia quelen) dietary amino acid requirements based on muscle amino acid composition
Provedor de dados: 63
Autores: Meyer,Gustavo; Fracalossi,Débora Machado.
Jundiá, Rhamdia quelen (Quoy &amp;amp; Gaimard, 1824), is a catfish native to Central and South America. The species has a number of excellent farming features, such as easy handling, low temperature resistance, efficient feed conversion, flavorsome meat and absence of intramuscular bones, and has been increasingly raised in Southern Brazil. However, most of its nutritional requirements have not yet been determined, including the essential amino acid (EAA) requirements. The objective of the present study was to estimate such requirements through the determination of muscle tissue amino acid composition for four groups of jundiá. Two groups were wild caught and allocated in two categories: from 1 to 100 g and from 101 to 200 g. The other two groups,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrition; Catfish; Siluriformes; Growth; Weigth gain.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400015

Alimentação e ciclo alimentar diário de Hoplosternum littorale (Hancock) (Siluriformes, Callichthyidae) nas lagoas Guaraná e Patos da planície do alto rio Paraná, Brasil
Provedor de dados: 104
Autores: Hahn,Norma Segatti; Almeida,Vera Lúcia Lescano de; Luz,Karla Danielle Gaspar da.
Hoplosternum Uttorale (Hancock, 1828) is an abundant species in the lagoons of the upper Paraná river floodplain. This species was sampled in Patos and Guaraná lagoons in the flood period (November/92-May/93) and low water period (June-October/93). To analyse food contents in the diet were analysed stomach of 91 adults. Twenty seven food items were recorded, among them, Testaceae, Nematoda, microcrustaceans, quironomids and organic detritus were predominant. These items allows to characterize the species as bentivore. To study feeding activity were analized 565 adults stomach contents. Food intake was more intense during flooding. Considering diel variation, the species started to eat during dusk, increasing during night, stopping to eat during daytime.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Callichthyidae; Hoplosternum Uttorale; Feeding; Diel cycle; Lagoons.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000100005

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

Fecundidade e tipo de desova do tamuatá, Hoplosternum littorale Hancock (Osteichthyes, Siluriformes) no Rio Curiaú, Macapá, Amapá
Provedor de dados: 104
Autores: Sá-Oliveira,Júlio César; Chellappa,Sathyabama.
During June 1999 to June 2000 one hundred and forty seven females of Hoplosternum littorale Hancock, 1828 were collected from the Curiaú River, Macapá, Amapá, Brazil. The objective of this study was to determine the fecundity and the type of spawning of H. littorale. Analysis of the percentage distribution of the oocyte diameter softh e females, in five different stages of gonadal development, showed that this species is a total spawner. There were two different size graups of oocytes with synchranic development. The total fecundity varied from 9, 144 to 31, 698 mature oocytes.The fecundity, when related to total length and weight, showed that it increases with the enhance in total length and weight.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osteichthyes; Siluriformes; Hoplosternum littorale; Fecundity; Typeof spawning.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000400009

Reproductive traits of the yellow-mandi catfish Pimelodus maculatus Lacépède (Osteichthyes, Siluriformes) in captive breeding
Provedor de dados: 104
Autores: Sato,Yoshimi; Fenerich-Verani,Nelsy; Verani,José Roberto; Godinho,Hugo Pereira; Sampaio,Edson Vieira.
Pimelodus maculatus Lacepede, 1803 is an important fish of the Säo Francisco river basin, where it is economically significant in both professional and sports fisheries. The fish, maintained in captivity, was subjected to hypophysation with crude caip pituitary extract. Approximately 70% of the females treated spawned viable eggs. The eggs were opaque, demersal, yellow and free. Egg stripping was performed at 213 hour-degrees (duration = 8.3 h) after the second dose injection, at water temperature of 25-26ºC. Hatching occurred at 394 hour-degrees (duration = 16.3 h) after egg fertilization, at water temperature of 24-25ºC. Egg fertilization rate was 64.8%. The relationship between absolute fecundity (AF), initial fertility (IF) and final fertility (FF) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Pimelodus maculatus; Yellow-mandi catfish; Reproduction.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400006

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

Testicular structure of three species of neotropical freshwater pimelodids (Pisces, Pimelodidae)
Provedor de dados: 104
Autores: Cruz,Rodrigo José Guimarães; Santos,José Enemir dos.
The testes structure of the following Siluriformes was studied: Pimelodus maculatus (Lacepède, 1803), Iheringichtys labrosus (Lütken, 1874) and Conorhynchos conirostris (Valenciennes, 1840). The testes of these species were dissected into cranial and caudal regions. The fringes of mature testes were counted and measured. Student's t-test was used to identify significant differences between fringe lengths of the two regions. To study the whole testes of each species in its resting and mature stage, testes were fixed in Bouin liquid for 6-8 hours and submitted to routine histological techniques. Standard histochemical techniques were used to detect carbohydrates and proteins. The testes of all species were paired and fringed organs. Histologically, cranial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fringed testes; Secretion; Seminal vesicle; Siluriformes; Testicular gland.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000200016

Dimorfismo sexual em Siluriformes e Gymnotiformes (Ostariophysi) da Amazônia
Provedor de dados: 36
Autores: Py-Daniel,Lúcia H. Rapp; Fernandes,Cristina Cox.
No presente trabalho é feito um levantamento dos casos de dimorfismo sexual em Siluriformes e Gymnotiformes. Este levantamento se restringe às formas Neotropicais, com ênfase mais especificamente, às da Amazônia. Peixes dessa região possuem uma grande diversidade, ainda que os limites intraespecíficos não estejam bem definidos. Embora preliminar, o mapeamento de características dimórficas em um cladograma referente a família Loricariidae (Siluriformes) auxilia na demonstração de que padrões de dimorfismo sexual são consistentes com hipóteses de monofiletismo. Em Apteronotidae (Gymnotiformes), com base no mapeamento dos caracteres tamanho e forma do focinho e presença de dentes diferenciada em árvores filogenéticas, podemos inferir que esses caracteres...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dimorfismo sexual; Siluriformes; Gymnotiformes; Evolução; Bagre; Peixes elétrico.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672005000100015

Morphological deformities in the osseous structure in spotted sorubim Pseudoplatystoma coruscans (agassiz &amp;amp; spix, 1829) with vitamin c deficiency
Provedor de dados: 42
Autores: FUJIMOTO,RODRIGO Y.; SANTOS,RUDÃ F.B.; CARNEIRO,DALTON J.
Vitamin C is essential for fish diets because many species cannot syntethize it. This vitamin is needed for bone and cartilage formation. Moreover, it acts as antioxidant and improve the immunological system. The present work investigated the effects of vitamin C diet supplementation to spotted sorubim (Pseudoplatystoma coruscans) fingerlings by frequency of bone and cartilage deformation. Ascorbyl poliphosphate (AP) was used as source of vitamin C in the diets for spotted sorubim fingerlings during three months. Six diets were formulated: one diet control (0 mg/kg of vitamin C) and 500, 1,000, 1,500, 2,000 and 2,500 mg AP/kg diets. Fishes fed without vitamin C supplementation presented bone deformation in head and jaws, and fin fragilities. Thus, 500 mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scurvy; Bone formation; Siluriformes; Ascorbic acid.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100379

Composição da ictiofauna em função da fisiografia de um riacho costeiro de Floresta Atlântica - Brasil
Provedor de dados: 49
Autores: Guimarães,Ana Tereza Bittencourt; Menezes,Márcia Santos de; Peret,Alberto Carvalho.
Os riachos costeiros apresentam grande diversidade de peixes, apesar dos impactos a que são submetidos. O conhecimento da estrutura e da composição da ictiofauna constitui importante esforço para levantamento de parâmetros de avaliação que possam proporcionar atitudes para a conservação destes ambientes. A composição da ictiofauna relacionada a características fisiográficas de riachos costeiros do sul do Brasil constitui-se uma contribuição para a interpretação da dinâmica destes ecossistemas. Foram realizadas coletas de peixes em cinco pontos amostrais do Rio do Pinto, localizado no município de Morretes, Paraná, Brasil. As coletas foram realizadas entre os meses de maio de 2006 a novembro de 2007, utilizando a técnica de pesca elétrica, com um esforço...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Characiformes; Substratos; Distribuição longitudinal.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000200006

Catfishes as prey items of Potamotrygonid stingrays in the Solimões and Negro rivers, Brazilian Amazon
Provedor de dados: 49
Autores: Shibuya,Akemi; Zuanon,Jansen.
In spite of the fact that catfish have rarely been reported as food items in the diets of freshwater stingrays, they are commonly observed in the stomach contents of species inhabiting the Solimões and Negro rivers in the Brazilian Amazon. The stomach contents of six rays from the Solimões River and 64 from the Negro River were analyzed, and catfishes (distributed among the families Callichthyidae, Cetopsidae, Doradidae and Loricariidae) were found in the stomach contents of four and 10 of these rays, respectively, comprising a frequency of occurrence of 20%. These data indicate a relevant participation of catfishes in the diets of potamotrygonid rays in the Amazon, and may reflect the regional diversity and abundance of Siluriformes in the region.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Feeding; Freshwater stingrays; Myliobatiformes; Siluriformes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000100041

Biology and population features of a rare species of Pseudopimelodidae from the Upper Paraná River Basin
Provedor de dados: 49
Autores: Esguícero,André Luiz Henríques; Arcifa,Marlene Sofia.
Streams contain an expressive fraction of the South American fish diversity, mostly composed of small-sized, endemic, and rare species. Populational, reproductive, and diet aspects of Microglanis garavelloi were studied, aiming to make a wide characterization of this species of bumblebee catfish. This is an endemic species of the Upper Paraná River Basin, and the only representative of the genus in the watershed. It is a littoral-dweller of small rivers, with asymptotic length of 34.1 mm and a population mostly composed of individuals with 20-30 mm of standard length. This species presents high fecundity and mortality rate, and low longevity and growth rate. It is a total spawner, October to February being the spawning period, and probably has brood care...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Conservation; Population structure; Reproductive dynamics; Diet.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000300018

Haematological Parameters of the Hybrid Surubim (Pseudoplatystoma reticulatum x P. corruscans) farmed in Brazil
Provedor de dados: 52
Autores: Jerônimo,Gabriela Tomas; Brum,Aline; Pádua,Santiago Benites de; Gonçalves,Eduardo Luiz Tavares; Capecci,Robson Soares; Ishikawa,Márcia Mayumi; Martins,Maurício Laterça.
This study evaluated the haematological parameters of the hybrid surubim (Pseudoplatystoma corruscans x P. reticulatum) farmed in intensive and semi intensive system. A total of 240 fish were examined, 120 from fish farm and 120 from a semi-intensive for comparison between the hot and cold season. The water quality was weekly measured to evaluate the influence of environmental conditions on the haematology. Fish from intensive system showed hematocrit and white blood cell count (WBC) higher in hot season while the total plasmatic protein, hemoglobin concentration, mean corpuscular hemoglobin concentration (MCHC) and mean corpuscular volume (MCV) were higher in cold season. In fish from semi intensive system, the red blood cells count (RBC) and total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Culture system; Hematology; Seasonality; Siluriformes.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000200254

Induced reproduction and reproductive characteristics of Rhinelepis aspera Agassiz, 1829 (osteichthyes: Siluriformes, Loricariidae)
Provedor de dados: 52
Autores: Sato,Yoshimi; Fenerich-Verani,Nelsy; Verani,José Roberto; Godinho,Hugo Pereira; Sampaio,Edson Vieira.
Rhinelepis aspera is the largest Loricariidae species found in the São Francisco river basin where it is now rarely caught. Brooders kept in tanks were hypophysed with crude carp pituitary extract (CCPE). Approximately 82% of the females responded positive to the treatment. The egg was opaque, demersal, round, yellow and adhesive. Egg stripping was done at 212 hour-degrees (= 8.2 h) after application of the second dose of CCPE (water temperature = 25-26 ºC). Hatching of the larvae occurred at 1022 hour-degrees (= 42.2 h), after fertilization of the eggs (water temperature =24-25 ºC). Fertilization rate of the eggs was 72%. Absolute fecundity (AF), initial fertility (IF) and final fertility (FF) in relation to the females' body weight are expressed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypophysation; Rhinelepis aspera; Siluriformes; São Francisco River.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000300006