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| Registros recuperados: 1.204 | |
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| Cunha,Jessyka A. da; Scheeren,Cecília Á.; Salbego,Joseânia; Gressler,Luciane T.; Madaloz,Laurício M.; Bandeira-Junior,Guerino; Bianchini,Adriane E.; Pinheiro,Carlos G.; Bordignon,Sérgio A. L.; Heinzmann,Berta M.; Baldisserotto,Bernardo. |
| ABSTRACT This study evaluated anesthetic efficacy and possible effects of the essential oils (EOs) of Cunila galioides (EOC) and Origanum majorana (EOO) on ventilatory rate (VR) and ionoregulation in Rhamdia quelen. In the anesthesia assessments, 50, 100, 200 and 300 μL L-1 EOC and 50, 100, 200, 300, 400 and 500 μL L-1 EOO were tested, and time for induction to sedation and anesthesia stages, as well as recovery, were taken. A second trial employed lower concentrations of both EOs, 10, 25, 50 and 100 μL L-1, in order to verify VR and Na+, K+ and Cl- whole body net fluxes. Sedation was achieved with both oils at 100 µL L-1, and anesthesia at ≥ 200 µL L-1. There was no significant difference between control and EO-treated groups regarding VR, but all fish... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ionoregulatory balance; Marjoram; Pennyroyal; Silver catfish; Ventilatory rate. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000100213 |
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| Garcia,Caroline; Moreira Filho,Orlando. |
| Karyotypes and other chromosomal markers were investigated in three species of the catfish genus Pimelodus, namely P. fur, P. maculatus and Pimelodus sp., from municipality of Três Marias, Minas Gerais, Brazil, using differential staining techniques (C-banding, Silver nitrate and CMA3 staining). The diploid chromosome number was 2n = 56 in P. maculatus and Pimelodus sp., while in P. fur 2n = 54. The karyotype of P. fur consisted in 32M + 8SM + 6ST + 8A with fundamental number (NF) of 100, that of P. maculatus 32M + 12SM + 12A with NF = 112, and that of Pimelodus sp. had 32M + 12Sm + 6ST + 6A with NF = 106.The nucleolar organizer regions (NORs) in all three species were invariably detected in telomeres of longer arm of the 20th chromosome pair. These sites... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish cytogenetics; Diploid number reduction; Chromosomal rearrangements; Chromosome banding; Catfishes. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200006 |
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| Reynalte-Tataje,David Augusto; Baldisserotto,Bernardo; Zaniboni-Filho,Evoy. |
| Different pH levels of water in the incubation and larviculture of 'curimbatá' (Prochilodus lineatus) were tested to evaluate the effect of this variable on the survival and development of eggs and larvae. During incubation, pH of 5.0, 6.0, 7.0, 8.0, and 8.5 was tested. To observe the effects of pH on larvae with different hatchery histories, the following experimental design was utilised (pH incubation - pH larviculture): L 6-6; L 6-7; L 7-6; L 7-7; L 7-8; L 8-7; L 8-8; L 8.5-7, and L 8.5-8.5. At pH 5.0 and four hours after incubation, an almost total mortality of incubated eggs was seen. Eggs incubated at pH 6.0 to 8.5 had similar fertilization and survival rates at the end of incubation, although eggs and larvae incubated at pH 6.0 had a smaller... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish culture; Fish larval physiology; Fish eggs physiology; Hatchery; Water quality. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000100179 |
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| Lira,Nibelle A.; Pompeu,Paulo S.; Agostinho,Carlos S.; Agostinho,Angelo A.; Arcifa,Marlene Sofia; Pelicice,Fernando M.. |
| ABSTRACT River regulation has fragmented fluvial ecosystems in South America, affecting fish migration and dispersion dynamics. In response, authorities have installed fish passage facilities (FPF) to mitigate impacts. However, little is known about the geographical distribution of these facilities, and no synthesis of the research effort applied to understanding their functioning and limitations exists. To address this issue, our study gathered the available scientific literature about fishways in South America to provide an overview of studied FPF and associated research effort. We found 80 studies that investigated 25 FPF, mostly ladders installed in the upper reaches of large rivers, particularly in the Paraná River Basin. One important finding is that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Dam; Fishway; Impact; Management. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200217 |
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| Rêgo,Mariana G.; Hazin,Fábio H. V.; Evêncio Neto,Joaquim; Oliveira,P. G. V.; Soares,Maria Goretti; Torres,Keilla Regina L. S.; Lana,Fernanda O.; Roque,Pollyana C. G.; Santos,Natália L.; Coelho,Rui. |
| This work aims to study the female reproductive tract of silky sharks, Carcharhinus falciformis, captured in the South and Equatorial Atlantic Ocean. Samples were collected between January 2008 and March 2010 through oceanic commercial vessels that targeted tuna and swordfish, with a total of 17 females collected. The methodologies followed for analyzing the ovaries of those females included both macroscopic and histological analysis. Macroscopically, it was possible to determine that the ovaries on these sharks is suspended by mesenteries in the anterior section of the body cavity, heavily irrigated by blood vessels, and contains a wide range of oocytes. Ovaries were found in three distinct maturational stages: Stage I (Immature), Stage II (Maturing) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Elasmobranchs; Histology; Maturity; Ovary; Reproduction. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400815 |
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| Coelho,Flavio do Nascimento; Pinheiro,Hudson Tercio; Santos,Robson Guimarães dos; Albuquerque,Cristiano Queiroz de; Martins,Agnaldo Silva. |
| In this study we analyze the population structure and diet of the coney Cephalopholis fulva at Trindade Island, Brazil, through direct observation with SCUBA diving in 11 reef sites around the Island, up to 50 m deep. Diet was based on 77 individuals collected with speargun. Mean population density and biomass were estimated at 29 individuals/100 m² and 13 kg/100 m², respectively. This species is regularly distributed along the costal environments of the Trindade Island, with no significant differences in densities and biomass detected among the different collection habitats (reef crest, reef slope, and reef plateau). However, significantly higher densities were observed micro-habitats with greater structural complexity, which may offer more shelter and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chelonia mydas; Coney; Feeding ecology; Grouper; Oceanic islands; Reef fish. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200013 |
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| Nielsen,Dalton Tavares Bressane. |
| Spectrolebias brousseaui is described from a temporary pool from the upper río Mamoré basin, Departamento Santa Cruz, Bolivia. The new species is distinguished from all congeners, by the overall dark blue coloration on the posterior two-thirds of body with bright blue iridescent spots vertically aligned in males. Spectrolebias brousseaui differs from all other species of the genus, except S. filamentosus, for having pelvic fins separated by a space (vs. pelvic fins in contact), long filaments at the tip of the dorsal and anal fins in males (vs. absence of filaments or presence only on dorsal fin in S. semiocellatus and S. inaequipinnatus, or the presence on the anal fin in S. chacoensis), and presence of contact organs on the scales of the flanks in males... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phylogeny; Spectrolebias filamentosus; Temporary pool. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100081 |
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| Pinto,Kalebe S.; Pires,Tiago H. S.; Stefanelli-Silva,Gabriel; Barros,Bruno S.; Borghezan,Elio A.; Zuanon,Jansen. |
| ABSTRACT Several organisms match their skin color to the prevalent background color, granting crypsis against predators. The rate at which body color changes occur varies among organisms as a result of physiological constraints and adaptation to variation in contrasts between objects and the environmental background. Faster darkening of body color is favored in environments that show higher amounts of contrast between common objects and the prevailing background. Soil types in Amazon forest streams (igarapés) create distinct environments with respect to the amount of contrast, a result of the amount of sand and clay, which offers different contrasts against dead leaves. Here, we investigated differences in the rates of color change among populations of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Background matching; Body color; Crenuchus spilurus; Crypsis; Phenotypic plasticity. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200204 |
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| Delapieve,Maria Laura S.; Lehmann A,Pablo; Reis,Roberto E.. |
| ABSTRACT The discovery of three new taxa of Hypoptotopomatini with ambiguous generic assignment prompted a reanalysis of the phylogenetic relationships of the tribe. The analysis focused on a data matrix of 56 terminals and 107 morphological characters comprising the three new taxa, most species of Hypoptopoma and Otocinclus, and all other species of the tribe. The 162 maximally parsimonious trees of 382 steps, consistency index of 0.41, and retention index of 0.83 were then summarized in a strict consensus tree. The results confirm the monophyly of the Hypoptopomatini, recover four genera as monophyletic (Acestridium, Hypoptopoma, Niobichthys, and Otocinclus), revealed Hypoptopoma and Oxyropsis to be non-monophyletic; and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoptopomatinae; Morphology; New genera; Systematics; Taxonomy. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000400212 |
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| Pereira,Jardely de Oliveira; Silva,Maralina Torres da; Vieira,Lisandro Juno Soares; Fugi,Rosemara. |
| We analyzed the diet of Triportheus curtus in Lake Amapá on the Acre River (AC - Brazil), during three distinct phases of the hydrological cycle (pre-flooding, flooding, and post-flooding stages). The flooding occurred between January and June of 2009. Samples were collected monthly from October 2008 through September 2009. After collection (at 19:00, 01:00, 07:00, and 13:00 hs) and taxonomic identification, fish were eviscerated and their stomachs preserved in a 4% formalin solution for later analysis. The diet was evaluated by the Index of Relative Importance (IRI), and temporal variations (pre-flooding, flooding, and post-flooding) in the diet were summarized by an ordination technique (DCA). The diet of T. curtus was comprised of several orders of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acre River; Feeding plasticity; Opportunist; Seasonality; Triportheinae. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300015 |
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| Registros recuperados: 1.204 | |
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