The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Adalberto Luis Val - One of the best experts on this subject based on the ideXlab platform.
-
High waterborne Mg does not attenuate the toxic effects of Fe, Mn, and Ba on Na+ regulation of Amazonian armored catfish tamoatá (Hoplosternum litoralle).
Environmental science and pollution research international, 2018Co-Authors: Rafael M. Duarte, Adalberto Luis Val, Ana Paula Benaduce, Luciano De Oliveira Garcia, Levy De Carvalho Gomes, Adriana Regina Chippari Gomes, Bernardo BaldisserottoAbstract:Formation water (FoW) is a by-product from oil and gas production and usually has high concentrations of soluble salts and metals. Calcium (Ca) and magnesium (Mg) have been shown to reduce the toxicity of metals to aquatic animals, and previous study showed that high waterborne Ca exerts mild effect against disturbances on Na+ regulation in Amazonian armored catfish tamoata (Hoplosternum littorale) acutely exposed to high Fe, Mn, and Ba levels. Here, we hypothesized that high Mg levels might also reduce the toxic effects of these metals on Na+ regulation of tamoata. The exposure to 5% FoW promoted an increase in Na+ uptake and a rapid accumulation of Na+ in all tissues analyzed (kidney
-
The Role of Size in Synchronous Air Breathing of Hoplosternum littorale
Physiological and biochemical zoology : PBZ, 2009Co-Authors: Katherine A. Sloman, Vera Maria Fonseca De Almeida-val, Richard D. Sloman, Gudrun De Boeck, Graham R. Scott, Fathima I. Iftikar, Chris M. Wood, Adalberto Luis ValAbstract:Abstract Synchronized air breathing may have evolved as a way of minimizing the predation risk known to be associated with air breathing in fish. Little is known about how the size of individuals affects synchronized air breathing and whether some individuals are required to surface earlier than necessary in support of conspecifics, while others delay air intake. Here, the air‐breathing behavior of Hoplosternum littorale held in groups or in isolation was investigated in relation to body mass, oxygen tensions, and a variety of other physiological parameters (plasma lactate, hepatic glycogen, hematocrit, hemoglobin, and size of heart, branchial basket, liver, and air‐breathing organ [ABO]). A mass‐specific relationship with oxygen tension of first surfacing was seen when fish were held in isolation; smaller individuals surfaced at higher oxygen tensions. However, this relationship was lost when the same individuals were held in social groups of four, where synchronous air breathing was observed. In isolati...
-
Isohemoglobin differentiation in the bimodal-breathing amazon catfish Hoplosternum littorale.
The Journal of biological chemistry, 2000Co-Authors: Roy E. Weber, Adalberto Luis Val, Angela Fago, Anny Bang, Marie-louise Van Hauwaert, Sylvia Dewilde, Franck Zal, Luc MoensAbstract:Abstract The bimodal gill(water)/gut(air)-breathing Amazonian catfish Hoplosternum littorale that frequents hypoxic habitats uses “mammalian” 2,3-diphosphoglycerate (DPG) in addition to “piscine” ATP and GTP as erythrocytic O2affinity modulators. Its electrophoretically distinct anodic and cathodic hemoglobins (HbAn and HbCa) were isolated for functional and molecular characterization. In contrast to HbAn, phosphate-free HbCa exhibits a pronounced reverse Bohr effect (increased O2 affinity with decreasing pH) that is obliterated by ATP, and opposite pH dependences ofK T (O2 association constant of low affinity, tense state) and the overall heat of oxygenation. Dose-response curves indicate small chloride effects and pronounced and differentiated phosphate effects, DPG < ATP < GTP < IHP. HbCa-O2 equilibria analyzed in terms of the Monod-Wyman-Changeux model show that small T state bond energy differences underlie the differentiated phosphate effects. Synthetic peptides, corresponding to N-terminal fragment of the cytoplasmic domain of trout band 3 protein, undergo oxygenation-linked binding to HbCa, suggesting a metabolic regulatory role for this hemoglobin. The amino acid sequences for the α and β chains of HbCa obtained by Edman degradation and cDNA sequencing show unusual substitutions at the phosphate-binding site that are discussed in terms of its reverse Bohr effect and anion sensitivities.
-
Anoxic cardiac performance in Amazonian and north-temperate-zone teleosts
Canadian Journal of Zoology, 1999Co-Authors: John R. Bailey, Adalberto Luis Val, Vera Maria Fonseca De Almeida-val, William R. DriedzicAbstract:Amazonian fish face periodic conditions of hypoxic water not commonly encountered by most other species. We examined the impact of simulated anoxia on cardiac performance of Amazonian species relative to north-temperate-zone species to assess whether the ability to maintain anoxic heart performance is related to either respiratory strategy or geographic location. Four Amazonian species (acara-acu (Astronotus ocellatus), acari-bodo (Lipossarcus pardalis), tambaqui (Colossoma macropomum), and tamoata (Hoplosternum littorale)) and four north-temperate-zone species (American eel (Anguilla rostrata), bullhead (Ictalurus punctatus), yellow perch (Perca flavescens), and rainbow trout (Oncorhynchus mykiss)) were studied. The Amazonian species display a range of respiratory modes from obligate gill-breather to facultative air-breather. The performance of isolated ventricular strips under conditions of impaired oxidative phosphorylation was monitored under the same conditions of temperature (25°C) and contraction f...
-
Activity levels of enzymes of energy metabolism in heart and red muscle are higher in north-temperate-zone than in Amazonian teleosts
Canadian Journal of Zoology, 1999Co-Authors: J. L. West, Adalberto Luis Val, John R. Bailey, Vera Maria Fonseca De Almeida-val, B. D. Sidell, William R. DriedzicAbstract:Fish living in the Amazon basin typically have body temperatures of about 30°C, whereas freshwater fishes of the north-temperate zone are eurythermal, with typical body temperatures of 10-20°C in summer. Enzyme activity levels in heart and red muscle of Amazonian species, which display various physiological mechanisms for dealing with hypoxic conditions, were compared with those in north-temperate-zone species. Five Amazonian species (acara-acu (Astronotus ocellatus), acari-bodo (Lipossarcus pardalis), tambaqui (Colossoma macropomum), tamoata (Hoplosternum littorale), and pirarucu (Arapaima gigas)) and four north-temperate-zone species (American eel, bullhead, yellow perch, and rainbow trout) were studied. The Amazonian species included obligate and facultative air breathers. Activities of key indicator enzymes associated with carbohydrate metabolism, fatty acid metabolism, the citric acid cycle, and the electron-transport chain were determined. There was no obvious correlation between cardiac enzyme acti...
Bernardo Baldisserotto - One of the best experts on this subject based on the ideXlab platform.
-
High waterborne Mg does not attenuate the toxic effects of Fe, Mn, and Ba on Na+ regulation of Amazonian armored catfish tamoatá (Hoplosternum litoralle).
Environmental science and pollution research international, 2018Co-Authors: Rafael M. Duarte, Adalberto Luis Val, Ana Paula Benaduce, Luciano De Oliveira Garcia, Levy De Carvalho Gomes, Adriana Regina Chippari Gomes, Bernardo BaldisserottoAbstract:Formation water (FoW) is a by-product from oil and gas production and usually has high concentrations of soluble salts and metals. Calcium (Ca) and magnesium (Mg) have been shown to reduce the toxicity of metals to aquatic animals, and previous study showed that high waterborne Ca exerts mild effect against disturbances on Na+ regulation in Amazonian armored catfish tamoata (Hoplosternum littorale) acutely exposed to high Fe, Mn, and Ba levels. Here, we hypothesized that high Mg levels might also reduce the toxic effects of these metals on Na+ regulation of tamoata. The exposure to 5% FoW promoted an increase in Na+ uptake and a rapid accumulation of Na+ in all tissues analyzed (kidney
-
Morphometric parameters comparisons of the digestive tract of four teleosts with different feeding habits
Ciência Rural, 2010Co-Authors: Alexssandro Geferson Becker, J.f. Gonçalves, Everton Rodolfo Behr, Dominguita Luhers Graça, Mário Kurtz Filho, Luciano De Oliveira Garcia, Tessie Beck Martins, Bernardo BaldisserottoAbstract:The present study compared some morphometric parameters of the digestive tract of four teleosts with different feeding habits: traira (Hoplias malabaricus, carnivore), silver catfish (Rhamdia quelen, omnivore), hassar (Hoplosternum littorale, omnivore), and grass carp (Ctenopharyngodon idella, herbivore). The digestive tract was removed from fish collected from nature and fixed for some morphometric analyses, such as: intestinal quotient, intestinal area quotient, vilosity height, digestive somatic index, and hepatosomatic index. Grass carp showed the highest values of intestinal quotient and height vilosity. On the other hand, the intestinal area quotient was higher in traira than in the other species. The intestinal quotient can be used to estimate the feeding habit, and the intestinal area quotient, vilosity height and the relationships between digestive tract length and fish weight or digestive tract weight can provide important additional information to analyze the feeding habits.
-
Morphometric parameters comparisons of the digestive tract of four teleosts with different feeding habits Comparações de parâmetros morfométricos do trato digestório de quatro teleósteos com diferentes hábitos alimentares
Universidade Federal de Santa Maria, 2010Co-Authors: Alexssandro Geferson Becker, Jamile Fabbrin Gonçalves, Luciano Oliveira Garcia, Everton Rodolfo Behr, Dominguita Luhers Graça, Mário Kurtz Filho, Tessie Martins, Bernardo BaldisserottoAbstract:The present study compared some morphometric parameters of the digestive tract of four teleosts with different feeding habits: traira (Hoplias malabaricus, carnivore), silver catfish (Rhamdia quelen, omnivore), hassar (Hoplosternum littorale, omnivore), and grass carp (Ctenopharyngodon idella, herbivore). The digestive tract was removed from fish collected from nature and fixed for some morphometric analyses, such as: intestinal quotient, intestinal area quotient, vilosity height, digestive somatic index, and hepatosomatic index. Grass carp showed the highest values of intestinal quotient and height vilosity. On the other hand, the intestinal area quotient was higher in traira than in the other species. The intestinal quotient can be used to estimate the feeding habit, and the intestinal area quotient, vilosity height and the relationships between digestive tract length and fish weight or digestive tract weight can provide important additional information to analyze the feeding habits.O presente estudo comparou alguns parâmetros morfométricos do trato digestório de quatro teleósteos com diferentes hábitos alimentares: traira (Hoplias malabaricus, carnivoro), jundiá (Rhamdia quelen, omnivoro), tamoatá (Hoplosternum littorale, omnivoro) e carpa capim (Ctenopharyngodon idella, herbivoro). O trato digestório foi removido dos peixes coletados da natureza e em seguida fixado para algumas análises morfométricas, tais como: quociente intestinal, quociente da área intestinal, altura da vilosidade, índice digestivo somático e índice hepatossomático. Os maiores valores para o quociente intestinal e a altura das vilosidades foram encontrados em carpa capim. Por outro lado, o quociente da área intestinal foi maior na traira do que nas outras espécies. O quociente intestinal pode ser utilizado para estimar o hábito alimentar, e o quociente da área intestinal, a altura da vilosidade e as relações entre o comprimento do trato digestório e o peso do peixe ou peso do trato digestório podem fornecer importantes informações adicionais para analisar o hábito alimentar
-
Calcium fluxes in Hoplosternum littorale (tamoatá) exposed to different types of Amazonian waters
Neotropical Ichthyology, 2009Co-Authors: Bernardo Baldisserotto, Levy De Carvalho Gomes, Carlos Eduardo Copatti, Edsandra Campos Chagas, Richard Philip Brinn, Rodrigo RoubachAbstract:Os peixes que vivem na Amazonia sao expostos a varios tipos de agua: aguas pretas, contendo grande quantidade de carbono orgânico dissolvido, aguas brancas, com concentracao de Ca2+ dez vezes maior que as aguas pretas e pH neutro, e aguas claras, com concentracao de Ca2+ duas vezes maior que as aguas pretas e pH tambem neutro. Dessa forma, o objetivo deste trabalho foi analisar o fluxo de Ca2+ no peixe de respiracao aerea facultativa Hoplosternum littorale (tamoata) exposto a diferentes tipos de aguas amazonicas. Os peixes foram aclimatados em agua de poco artesiano (semelhante a agua clara) e depois colocados individualmente em câmaras para medir o fluxo de Ca2+. Apos 4 h, a agua das câmaras foi trocada por um tipo diferente de agua. A transferencia do tamoata das aguas pobres em ions agua preta e preta acida ou da agua branca, rica em ions, para as aguas preta e preta acida, pobres em ions, resulta em uma perda de Ca2+ apenas nas duas primeiras horas de experimento. Entretanto, a transferencia da agua preta e preta acida, para a agua branca resulta em um influxo de Ca2+. Os resultados obtidos nos permitem concluir que a transferencia do tamoata para as aguas preta e preta acida, pobres em ions, leva a uma temporaria perda de Ca2+, e a quantidade de Ca2+ na agua branca, rica em ions, e adequada para prevenir sua perda apos a transferencia. Sendo assim, a transferencia do tamoata entre as aguas estudadas nao resulta em serios disturbios no Ca2+.
Vera Maria Fonseca De Almeida-val - One of the best experts on this subject based on the ideXlab platform.
-
The Role of Size in Synchronous Air Breathing of Hoplosternum littorale
Physiological and biochemical zoology : PBZ, 2009Co-Authors: Katherine A. Sloman, Vera Maria Fonseca De Almeida-val, Richard D. Sloman, Gudrun De Boeck, Graham R. Scott, Fathima I. Iftikar, Chris M. Wood, Adalberto Luis ValAbstract:Abstract Synchronized air breathing may have evolved as a way of minimizing the predation risk known to be associated with air breathing in fish. Little is known about how the size of individuals affects synchronized air breathing and whether some individuals are required to surface earlier than necessary in support of conspecifics, while others delay air intake. Here, the air‐breathing behavior of Hoplosternum littorale held in groups or in isolation was investigated in relation to body mass, oxygen tensions, and a variety of other physiological parameters (plasma lactate, hepatic glycogen, hematocrit, hemoglobin, and size of heart, branchial basket, liver, and air‐breathing organ [ABO]). A mass‐specific relationship with oxygen tension of first surfacing was seen when fish were held in isolation; smaller individuals surfaced at higher oxygen tensions. However, this relationship was lost when the same individuals were held in social groups of four, where synchronous air breathing was observed. In isolati...
-
Anoxic cardiac performance in Amazonian and north-temperate-zone teleosts
Canadian Journal of Zoology, 1999Co-Authors: John R. Bailey, Adalberto Luis Val, Vera Maria Fonseca De Almeida-val, William R. DriedzicAbstract:Amazonian fish face periodic conditions of hypoxic water not commonly encountered by most other species. We examined the impact of simulated anoxia on cardiac performance of Amazonian species relative to north-temperate-zone species to assess whether the ability to maintain anoxic heart performance is related to either respiratory strategy or geographic location. Four Amazonian species (acara-acu (Astronotus ocellatus), acari-bodo (Lipossarcus pardalis), tambaqui (Colossoma macropomum), and tamoata (Hoplosternum littorale)) and four north-temperate-zone species (American eel (Anguilla rostrata), bullhead (Ictalurus punctatus), yellow perch (Perca flavescens), and rainbow trout (Oncorhynchus mykiss)) were studied. The Amazonian species display a range of respiratory modes from obligate gill-breather to facultative air-breather. The performance of isolated ventricular strips under conditions of impaired oxidative phosphorylation was monitored under the same conditions of temperature (25°C) and contraction f...
-
Activity levels of enzymes of energy metabolism in heart and red muscle are higher in north-temperate-zone than in Amazonian teleosts
Canadian Journal of Zoology, 1999Co-Authors: J. L. West, Adalberto Luis Val, John R. Bailey, Vera Maria Fonseca De Almeida-val, B. D. Sidell, William R. DriedzicAbstract:Fish living in the Amazon basin typically have body temperatures of about 30°C, whereas freshwater fishes of the north-temperate zone are eurythermal, with typical body temperatures of 10-20°C in summer. Enzyme activity levels in heart and red muscle of Amazonian species, which display various physiological mechanisms for dealing with hypoxic conditions, were compared with those in north-temperate-zone species. Five Amazonian species (acara-acu (Astronotus ocellatus), acari-bodo (Lipossarcus pardalis), tambaqui (Colossoma macropomum), tamoata (Hoplosternum littorale), and pirarucu (Arapaima gigas)) and four north-temperate-zone species (American eel, bullhead, yellow perch, and rainbow trout) were studied. The Amazonian species included obligate and facultative air breathers. Activities of key indicator enzymes associated with carbohydrate metabolism, fatty acid metabolism, the citric acid cycle, and the electron-transport chain were determined. There was no obvious correlation between cardiac enzyme acti...
Indar W. Ramnarine - One of the best experts on this subject based on the ideXlab platform.
-
Dry Season Spawning in the Cascadu Hoplosternum littorale
Living World Journal of the Trinidad and Tobago Field Naturalists' Club, 2002Co-Authors: Indar W. RamnarineAbstract:Hoplosternum littorale (Hancock 1828) is a neotropical armoured catfish belonging to the family Callichthyidae. While the cascadu, as the fish is known locally, spawns in the rainy season, from June to November, nests of the cascadu were observed during February 2002 in a pond at the Bamboo Grove Fish Farm, Valsayn.
-
Hatching trials with eggs of the armoured catfish Hoplosternum littorale (Hancock)
Aquaculture, 2001Co-Authors: Indar W. RamnarineAbstract:The armoured catfish Hoplosternum littorale (Hancock) is commercially cultured in Trinidad and Tobago, Guyana and Suriname. In some culture systems, fingerlings are collected from the wild, but more commonly the fingerlings are hatchery produced. Hatching success is a key problem. In initial hatching trials with low hatching success, the culture water was found to contain high populations of the bacterium Aeromonas hydrophila and the fungus Saprolegnia sp. In subsequent trials, the egg masses were treated with antibiotics and anti-fungal agents. While the anti-fungal treatment of intact egg masses had little apparent effect on hatching success, the antibiotic treatment resulted in an increase from 52.2% to 60.5%. When egg masses were broken into smaller pieces and treated with antibiotics and anti-fungal agents, hatching success increased from 50.0% to 81.8%. This suggests that treatment of the egg masses with antibiotics and anti-fungal agents is more effective with smaller egg masses.
-
Induction of nest building and spawning in Hoplosternum littorale
Journal of Fish Biology, 1995Co-Authors: Indar W. RamnarineAbstract:Sexually mature neotropical armoured catfish, Hoplosternum littorale were induced to build nests and spawn by reducing the conductivity of the water. Simulation of rain and increasing water level without a reduction in conductivity had no effect.
-
Larval culture, development and growth of the cascadu, Hoplosternum littorale (Hancock 1828; Callichthyidae)
Aquaculture, 1994Co-Authors: Indar W. RamnarineAbstract:Abstract Egg masses of the cascadu, Hoplosternum littorale were hatched after being treated with antibiotic and antifungal agents. Larvae produced were fed initially with washed brine shrimp nauplii, and gradually weaned onto a high-protein pelleted ration. After a period of 61 days, the juveniles had a mean length of 41.8 mm ± 2.3 s.d. and weighed 1.77 g ± 0.42 s.d. Total mortality was 14% and was highest 2 to 4 days after hatching, when the larvae were switching from endogenous to exogenous nutrition, and at 12 to 15 days, when they were switching from branchial to bimodal respiration. Twelve larval stages were identified and described, and the juvenile stage was attained at an age of 29 days at a temperature of 26°C ± 2°C.
Gerard Hostache - One of the best experts on this subject based on the ideXlab platform.
-
influence de la temperature d incubation sur le rapport mâle femelle chez l atipa Hoplosternum littorale hancock 1828
Canadian Journal of Zoology, 1995Co-Authors: Gerard Hostache, Michel Pascal, Christian TessierAbstract:Sixteen batches of eggs collected immediately after spawning from five atipa (Hoplosternum littorale, (Hancock, 1828), Siluriformes, Callichthyidae) nests have been incubated at temperatures ranging from 22.5 to 32 °C. After a growing period of 8 months allowing all the fishes to express totally all secondary sexual characteristics, the sex of 9756 fishes was determined. The sexing criteria based on the color and length of the first ray of the pectoral fins are very reliable, and may lead to an error for only 0.3% of the fishes. For the 16 batches, the male sex ratio (ratio between the number of males and the total number of fishes) varies from 46.4 to 98.5% and is always greater than 50% with one exception. An overall analysis of the results shows no marked correlation (r2 = 0.312) between the proportions of males and the thermic conditions during incubation of eggs. But within each set of eggs from the same nest, this ratio systematically increases with increasing temperatures. The very low probability ...
-
biologie de la reproduction de l atipa Hoplosternum littorale teleostei siluriforme callichthyidae
1994Co-Authors: Gerard HostacheAbstract:L'Atipa, Hoplosternum littorale, Siluriforme a plaques osseuses de la famille des Callichthyidae, est un poisson qui peuple les marais hypoxiques d'une aire de repartition qui s'etend de Trinidad au Paraguay. Son comportement reproducteur est original: la ponte de une ou plusieurs femelles est deposee dans un nid de bulles et de debris vegetaux construit et garde durant toute la duree des incubations par le mâle. Les travaux presentes dans cette these ont ete realises en milieu naturel et en etang. L'observation du comportement reproducteur, le denombrement et la localisation des nids construits en etang, l'evaluation du poids des pontes individuelles ou collectives, l'enregistrement de l'evolution des valeurs du Rapport Gonado-Somatique au cours du cycle annuel et de celui de la temperature dans les nids, ont permis: ― La mise en evidence d'un choix de la localisation du nid et de l'heure de la ponte au cours du cycle nycthemeral. ― Une description du cycle annuel de reproduction de l'espece en pisciculture, et la confrontation de ses caracteristiques a celles etablies en milieu naturel. ― Une tentative de quantification des performances de ponte et d'evaluation de l'investissement parental au cours d'une saison de reproduction. ― Une caracterisation des parametres thermiques de l'incubation en milieu controle et dans les nids construits en etang. ― La mise en evidence de l'influence des conditions thermiques durant l'incubation sur la valeur du sexe-ratio. Ces resultats, conduisent a proposer une vision de la strategie de reproduction de l'Atipa, a evaluer l'interet du modele biologique que constitue ce poisson pour l'etude de l'influence des conditions thermiques durant l'incubation sur les variations du sexe-ratio et a evoquer les applications piscicoles qu'ils suggerent
-
temperature et incubation chez l atipa Hoplosternum littorale teleostei siluriforme
Aquatic Living Resources, 1992Co-Authors: Gerard Hostache, M. Kernen, Michel Pascal, Christian TessierAbstract:Deux series d'experiences ont ete menees, les unes en etang de pisciculture, les autres en laboratoire, pour determiner la relation entre conditions thermiques et duree de l'incubation chez l'Atipa [Hoplosternum littorale (Hancock, 1828)]. En milieu controle, 36 °C constituerait la limite superieure de la temperature d'incubation permettant la survie des œufs. La temperature minimum testee, 24 °C, ne constitue pas la limite inferieure permettant la survie des œufs. La duree minimale d'incubation, evaluee a 36 heures, serait obtenue pour une temperature d'incubation de 33,6 °C. La quantite minimum d'energie fournie par l'environnement pour obtenir l'eclosion est exprimee en degres-heures et s'eleverait a 1 201 °C × h pour la temperature d'incubation de 31,3 °C. Une typologie du developpement embryonnaire de l'espece, directement inspiree de celle de Ballantyne (1930), a ete calee sur une echelle exprimee en °C × h. En etangs, les conditions de temperature au sein de la ponte, plus elevees que celles de l'air, sont sensiblement identiques a celles de l'eau environnante et relativement stables d'une experience a l'autre (27 a 29 °C en moyenne). Le temps d'incubation observe sur l'ensemble des 9 nids equipes de capteurs varie de 47 a 54 heures. A temps d'incubation egal, le nombre de degres-heures necessaires pour obtenir l'eclosion est plus important en etang qu'en milieu controle. La discussion porte sur le role du nid dans la reproduction de l'espece.
