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Registros recuperados: 70 | |
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Copatti,Carlos Eduardo; Garcia,Luciano de Oliveira; Baldisserotto,Bernardo. |
Na lavoura arrozeira, o uso de agroquímicos no controle de plantas daninhas e insetos é recomendado para garantir maior produtividade. Entretanto, sua utilização pode acarretar uma série de efeitos em organismos não alvos, como os peixes. Deste modo, esta revisão tem como objetivo analisar os dados existentes sobre os efeitos dos agroquímicos utilizados no cultivo de arroz em peixes, de modo a propor estratégias que minimizem seu impacto. Existe grande variação entre os agroquímicos testados quanto à toxicidade, sendo a determinação da concentração letal mediana em 96 horas apenas uma estimativa inicial para estudos adicionais, uma vez que para muitos deles concentrações inferiores podem provocar alterações bioquímicas nos tecidos dos peixes, as quais se... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lavoura arrozeira; Herbicidas; Pesticidas; Rizipiscicultura; Manejo integrado de pragas. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000400023 |
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Parodi,Thaylise Vey; Vargas,Agueda Palmira de Castagna; Krewer,Carina; Flores,Érico Marlon de Moraes; Baldisserotto,Bernardo; Heinzmann,Berta Maria; Oliveira,José Vladimir de; Popiolski,Ariana Secco; Minozzo,Mariane. |
This study investigated the chemical composition of five different extracts of Aloysia triphylla and their activity against Aeromonas sp. The extracts were obtained from the dried leaves by pressurized CO2 extraction at 30, 50 and 70ºC, and 100, 150, and 200 bar, and analyzed by GC/FID and GC-MS. The antibacterial activity was assayed by the microdilution method. The tested microorganisms comprised seven Aeromonas isolates obtained from the kidney of infected silver catfish, Rhamdia quelen. The yield, chemical composition and antibacterial activity of the extracts were dependent on the extraction conditions. Mono and sesquiterpenoids were the major constituents of all the extracts and the highest extraction yield was obtained at 70ºC and 200 bar. A.... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aloysia triphylla; Pressurized carbon dioxide extraction; Aeromonas sp. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000200014 |
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Garcia,Luciano de Oliveira; Gutiérrez-Espinosa,Mariana; Wásquez-Torres,Walter; Baldisserotto,Bernardo. |
The objective this study was to evaluate the effects of dietary protein levels in pirapitinga, Piaractus brachypomus, submited to extremely acidic or alkaline pH. Juveniles were fed for 20 days with three diets with different crude protein (CP) levels (25.3, 32.4 and 40.0%) and then separated in five groups (n=10, three replicates each) which were kept in 60 L aquaria and exposed to pH 3.0, 3.5, 7.0, 10, or 10.5. Fish were removed from aquaria when they showed loss of swimming balance, and then blood was collected and plasma separated for measurement of Na+, Cl- and K+ levels. The increase of dietary protein levels (up to 40.0% CP) provided some protection for pirapitinga at pH 3.5 or 10.0 because the time to lose equilibrium increased after acute... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pirapitinga; Fish; Ionoregulation; Extreme pH. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000200017 |
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Silva,Hugo Napoleão Pereira da; Carvalho,Brenna Celina Ferreira de; Maia,Janna Laely dos Santos; Becker,Alexssandro Geferson; Baldisserotto,Bernardo; Heinzmann,Berta Maria; Mourão,Rosa Helena Veras; Silva,Lenise Vargas Flores da. |
ABSTRACT: The aim of this study was to investigate the anesthetic effect of the essential oils (EOs) of Lippia alba (citral and linalool chemotypes, EOLA-C and EOLA-L respectively) and Lippia origanoides (chemotype carvacrol, EOLO-Ca) on tambaqui (Colossoma macropomum) juveniles. The tested concentrations of the L. alba and L. origanoides EOs were: 25, 50, 100, and 200 μL/L. Time required to reach the stages of sedation, deep anesthesia, and recovery, as well as ventilatory frequency, were monitored for each EO concentration. The results indicated that all EO concentrations tested induced tambaqui anesthesia and that the ventilatory frequency was altered by the EOs. L. origanoides showed the shortest time to induce sedation and anesthesia, but had long... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anaesthesia; Carvacrol; Citral; Linalool; Ventilatory frequency. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000600402 |
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Salbego,Joseânia; Pretto,Alexandra; Silva,Vera Maria Machado da; Loro,Vania Lucia; Lazzari,Rafael; Gioda,Carolina Rosa; Baldisserotto,Bernardo. |
The effects of glyphosate, a nonselective herbicide (1.0 or 5.0mg L-1) on digestive enzymes activity (stomach and intestine) were evaluated in juveniles of piava (Leporinus obtusidens) after 90 days of exposure. The activity of acid protease, trypsin, chymotrypsin and amylase increased with the increase of glyphosate concentration. These results indicate that glyphosate affects digestive enzyme activities in this species, and may be an indicator of poor nutrient availability when fish survive in herbicide-contaminated water. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Herbicide; Acid protease; Amylase; Trypsin. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000901603 |
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Riffel,Ana Paula Konzen; Jardim,Sinara; Pires,Marcela Ciprandi; Bertagnolli,Bruna; Corrêa,Bruna Renata Silva; Ré,Francine Cenzi de; Zambra,Francis Maria Bao; Lubini,Greice; Garcia,Luciano Oliveira; Baldisserotto,Bernardo. |
The aim of this study was to investigate the preferred pH in silver catfish Rhamdia quelen acclimated to different pH. Fish were acclimated for one week at pH 4.2±0.1, 5.2±0.1, 6.3±0.1, 7.2±0.1, 8.0±0.1, and 9.0±0.1 and after this period, transferred to a polyethylene tube with a pH gradient from 3.5 to 10.0. The position of the fish in the pH gradient was observed 1, 6 and 12 hours after transference. Results indicated that acclimation to different pH did not change pH preference of silver catfish (pH 7.0-7.6), occurring only a transitory variation around 6 hours after transference. This pH preference coincides with the best pH indicated in the literature for growth of this species. |
Tipo: Info:eu-repo/semantics/report |
Palavras-chave: PH preference; Water quality; Behavior. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000500012 |
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Piaia,Rosamari; Baldisserotto,Bernardo. |
A densidade de estocagem (DE) é um fator que pode afetar o crescimento dos peixes. Como a DE ótima varia de acordo com a espécie e o sistema de cultivo utilizado, o presente estudo foi realizado com o objetivo de avaliar o efeito da DE sobre o crescimento de alevinos de Rhamdia quelen mantidos em sistema de circulação fechada. Foram utilizadas 3 DE nos experimentos: 114, 227 e 454 alevinos/m³. Ao final de 50 dias, verificou-se uma correlação significativa entre comprimento, peso, sobrevivência, taxa de crescimento específico, DE final, biomassa por volume e a DE. O aumento da DE (dentro dos limites estudados) provocou um aumento nesses parâmetros. Portanto, o presente experimento demonstra que é mais vantajoso criar alevinos de jundiá em circuito fechado... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Piscicultura; Teleósteo; Jundiá; Alevinos; Densidade de estocagem. |
Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782000000300024 |
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Becker,Alexssandro Geferson; Garcia,Luciano de Oliveira; Kochhann,Daiani; Gonçalves,Jamile Fabbrin; Loro,Vania Lúcia; Baldisserotto,Bernardo. |
Ionic contents (Na+, K+ and Cl-) of plasma and gallbladder bile (GB) of juveniles silver catfish, Rhamdia quelen (156.1±0.2g, 28.2±0.3cm), were determined in three different times (0, 6 and 24h) after exposure to: a) control or high dissolved oxygen (DO = 6.5mg L-1) + low NH3 (0.03mg L-1); b) low DO (3.5mg L-1) + low NH3; c) high DO + high NH3 (0.1mg L-1); and d) low DO + high NH3. High waterborne NH3 or low DO levels increased plasma and GB ion levels. These parameters might have followed different mechanisms to affect osmoregulation since a synergic effect of these variables was detected. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen compound; Hypoxia; Ion levels; Jundiá; Osmoregulation. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000600020 |
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Baldisserotto,Bernardo. |
Esta revisão aborda a situação da piscicultura continental no Rio Grande do Sul nos últimos anos em termos de produção e problemas enfrentados pelo setor. Além disso, apresenta algumas perspectivas futuras para a piscicultura continental neste Estado. O Rio Grande do Sul contribui com uma boa porcentagem da produção brasileira de piscicultura continental, mas passa por um período de estagnação nos últimos anos. Há um predomínio muito grande de espécies de peixes exóticas na produção (principalmente carpas). A venda de peixes concentra-se no período que antecede à Páscoa e a fiscalização sanitária ainda é reduzida. Produtores estão iniciando a formação de cooperativas na região central do Rio Grande do Sul. A publicação de livros sobre cultivo de espécies... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pescado; Criação de peixes; Peixes nativos; Estatística de piscicultura. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000100051 |
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Zaions,Maria Ignez; Baldisserotto,Bernardo. |
The objective of this study was to investigate the effect of water pH on survival and Na+ and K+ body levels of fingerlings of Rhamdia quelen, a freshwater catfish. Survival was 100% at pH 4.00 to 9.0 throughout the experiment (96h), and death of all fingerlings was observed only at pH 3.75 or lower and at pH 10.50. There was a significant correlation between water pH and body Na+ levels (but not K+ levels) 72h after transfer. There was a clear reduction in Na+ levels when the transfer was to pH outside the 5.0 - 9.0 range, which is in agreement with the fact that fishes exposed to such pHs present loss of ions by diffusion and/or a decrease in absorption. Growth experiments with this species probably would present best results within the 5.0 - 9.0 pH... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhamdia quelen; Fingerlings; PH; Body ion levels; Survival. |
Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782000000600020 |
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Marchioro,Maria Ignez; Baldisserotto,Bernardo. |
O objetivo deste trabalho foi testar a sobrevivência de alevinos de jundiá a diferentes concentrações de salinidade (sal marinho comum e água do mar), pois o sal é indicado no tratamento de algumas doenças e também para reduzir o estresse durante o manuseio e transporte de peixes. Os alevinos (1,68 ± 0,87g) permaneceram de 3 a 7 dias em tanques de 1400l, com água corrente e temperatura entre 23 e 25°C, sendo alimentados diariamente. Após esse período, foram colocados 50 alevinos em tanques de 250l, com circulação fechada, biofiltro e aeração constante. A concentração da água nos tanques foi de 8,0; 9,0; 9,25; 9,50 e 10,0g/l de sal marinho comum ou 10,0; 12,0 e 14,0 de água do mar artificial. A sobrevivência dos alevinos foi observada ao longo de 96h. Para... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sal comum; Teleósteo; Piscicultura; Água do mar. |
Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781999000200021 |
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Garcia,Luciano de Oliveira; Barcellos,Leonardo José Gil; Baldisserotto,Bernardo. |
The objective of this study was to verify net ion fluxes and ammonia excretion in silver catfish transported in plastic bags at three different loading densities: 221, 286 and 365g L-1 for 5h. A water sample was collected at the beginning and at the end of the transport for analysis of water parameters. There was a significant positive relationship between net ion effluxes and negative relationship between ammonia excretion and loading density, demonstrated by the following equations: Na+: y-24.5-0.27x, r2=0.99, Cl-: y=40.2-0.61x, r2=0.98, K+: y=8.0-27.6x, r2=0.94; ammonia excretion: y=-11.43+0.017x, r2=0.95, where y: net ion flux (mmol kg-1 h-1) or ammonia excretion (mg kg-1 h-1) and x: loading density (g). Therefore, the increase of loading density... |
Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Fish transport; Ionoregulation; Load density. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001001854 |
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Cunha,Mauro Alves da; Zeppenfeld,Carla Cristina; Garcia,Luciano de Oliveira; Loro,Vania Lucia; Fonseca,Milene Braga da; Emanuelli,Tatiana; Veeck,Ana Paula de Lima; Copatti,Carlos Eduardo; Baldisserotto,Bernardo. |
The aim of this study was to identify the time of anesthetic induction and recovery of silver catfish (Rhamdia quelen) exposed to eugenol. It was also determined the efficacy of the anesthetic as a stress reducing agent and performed a sensory analysis of the fillets from fish exposed to this substance. The silver catfish were exposed to air for 1min to carry out biometry, and blood was collected at 0, 1 and 4 hours later. Eugenol can be used in the range of 20-50mg L-1 for anesthetic induction in silver catfish, and recovery time from anesthesia was not affected by eugenol concentration. The control group showed significantly higher cortisol levels 4 hours after biometry than at time zero. Fish anesthetized with eugenol (50mg L-1) presented significantly... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clove oil; Rhamdia quelen; Sedation; Stress; Taste. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010001000009 |
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Miron,Denise dos Santos; Becker,Alexssandro Geferson; Loro,Vania Lúcia; Baldisserotto,Bernardo. |
The aim of the present study was to determine the effects of waterborne un-ionized ammonia (NH3) on the survival and growth of silver catfish (Rhamdia quelen). Juveniles were exposed to 0.10, 0.22, and 0.42mg L-1 NH3 at pH 8.2 for 45 days. After 15 days, a significant mortality rate (33%) was observed in the fish exposed to 0.42mg L-1 NH3. After 20 days, 23% and 43% mortality (both significant) was observed in fish exposed to 0.22 and 0.42mg L-1 NH3, respectively. A significant negative relationship between survival, length, daily weight gain, standard growth rate, and biomass of juveniles of silver catfish per tank with waterborne NH3 levels was found at the end of the experiment. The resulting survival and waterborne NH3 relationship indicated that, to... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish culture; Nitrogenous compounds; Weight gain. |
Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000200028 |
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Costa,Silvio Teixeira da; Sutili,Fernando Jonas; Gressler,Luciane Tourem; Loebens,Luíza; Colpo,Carine Vargas; Lazzari,Rafael; Baldisserotto,Bernardo. |
ABSTRACT: Humic substances are organic compounds that possess high molecular weight and are formed by the decomposition of plant materials. Humic substances comprise humic acids, fulvic acids and humin. Humic acids (HA) have shown to be able to provide some protection to biological membranes of fish in water with low pH, replacing the protective action of Ca2+. Thus, this studyaimed to observe growth of silver catfish ( Rhamdia quelen ) juveniles exposed to pHs 5.5 and 6.5 and to different levels of HA: 0, 10, 25 and 50mg L-1. Results showed that, irrespective of pH, HA was highly detrimental to silver catfish growth, since the higher the concentration of HA, the lower the weight gain and feed intake, resulting in lower biomass and lower specific growth... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Humic substance; Water pH; Fish growth; Organic carbon. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000601094 |
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Bandeira Junior,Guerino; Souza,Carine de Freitas; Baldissera,Matheus Dellaméa; Descovi,Sharine Nunes; Silveira,Bibiana Petri da; Tasca,Caiane; Mourão,Rosa Helena Veras; Vargas,Agueda Palmira Castagna de; Baldisserotto,Bernardo. |
ABSTRACT: The use of natural products, such as essential oils (EOs), is a potential novel approach to treat fish bacterial infections with a lower risk of developing resistance. There has been a number of studies reporting the activity of EOs as those obtained from the species Achyrocline satureioides, Aniba parviflora, Aniba rosaeodora, Anthemis nobilis, Conobea scoparioides, Cupressus sempervirens, Illicium verum, Lippia origanoides, and Melaleuca alternifolia against bacteria. However, there are few studies investigating the effect of these EOs against fish bacteria. Therefore, the aim of this study was to evaluate the in vitro antibacterial activity of EOs against the following fish bacteria, Aeromonas hydrophila, Citrobacter freundii, and Raoultella... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aeromonas hydrophila; Antibacterial activity; Silver catfish; Longevity; Therapeutic success. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000600451 |
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Registros recuperados: 70 | |
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