The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L... more The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L or lower fish did not achieve a complete anesthesia state. At 150 mg/L, MS-222 induced anesthesia within 36 seconds and recovered from a 10 minutes period of anesthesia within 5.2 min. Higher concentrations (200, 250 and 300 mg/L) anesthetized fish in lesser times, with the offset of mortality (16.7 and 33.3%) at the 200 and 300 mg/L MS-222 doses, respectively. The only significant differences observed in the hematological parameters, was for the glucose values in fish anesthetized with 250 and 300 mg/L. From the results, the recommended dose of MS-222 for handling matrinxã juveniles is 150 mg/L.Investigou-se o uso de MS-222 como anestésico para juvenis de matrinxã. Concentrações de 100 mg/L ou menores não causam uma indução completa à anestesia. A 150 mg/L os peixes foram induzidos à anestesia após 36 segundos e se recuperam em 5,2 minutos após exposição ao anestésico durante 10 minuto...
Fig. 3. Net Ca2+ fluxes of Hoplosternum littorale transferred from black water (BW) to acidic bla... more Fig. 3. Net Ca2+ fluxes of Hoplosternum littorale transferred from black water (BW) to acidic black water pH 3.5 (ABW) or white water (WW) (a), and fish transferred from ABW to BW or WW (b) and fish transferred from WW to BW or ABW (c). The first bar in the left side of the figure represents the 2-4 h flux of the first exposure. Data expressed as mean ± SEM. Positive values indicate net influxes and negative values net effluxes. Asterisks (*) indicate significantly different from the same group 2 h after transfer by Kruskall- Wallis ANOVA and Mann-Whitney test (P <0.05). Crosses (+) indicate significantly different from the previous water condition by Kruskall-Wallis ANOVA and Mann-Whitney test (P <0.05).
Objetivou-se com este trabalho avaliar o efeito da ingestão de ractopamina nas concentrações 0 pp... more Objetivou-se com este trabalho avaliar o efeito da ingestão de ractopamina nas concentrações 0 ppm (controle), 10 ppm, 20 ppm e 40 ppm na ração, sobre os parâmetros fisiológicos e imunológicos, por meio da análise dos parâmetros hematológicos e da concentração sérica de cortisol e lactato, em 80 tilápias do Nilo (Oreochromis niloticus) da linhagem GIFT, com peso médio de 500 gramas, distribuídas aleatoriamente em 16 caixas d'água, com capacidade para 500 litros, com a densidade de 5 animais. Retirando-se ao dia 0 1 animal de cada caixa e cada 20 dias, 2 peixes por caixa, totalizando 8 peixes de cada tratamento. Coletaram-se amostras de sangue para dosagem de cortisol, lactato e parâmetros hematológicos (contagem de hemácias, leucócitos, proteínas totais - PPT, volume globular – VG, hemoglobina. O lactato apresentou uma diminuição significativa (p<0,05) nos dois tempos de coleta com 10 ppm (3,79 mmol/L aos 20 dias e 1,58 mmol/L aos 40 dias) e quando comparado ao controle (4,61...
Flooded areas of reservoirs and artificial lakes have been increasingly used for fish production;... more Flooded areas of reservoirs and artificial lakes have been increasingly used for fish production; however, the waste generated by aquaculture has become a concern for the sustainable development of this activity. One of the main strategies adopted by management and regulatory agencies is the use of hydrodynamic models that calculate the carrying or nutrient load capacity of a particular water body and the effect of fish farming. These models are precise in the development of optimal strategies for feeding and waste calculation. This review paper addresses this topic and describes the methodology developed for the analysis and simulation of the carrying capacity for fish production, based on the integration of the Fish‑PrFEQ nutritional bioenergetic model and the hydrodynamic model of Dillon & Rigler. This methodology allows evaluating the real contribution of aquaculture waste and assists in the planning and management of aquaculture in these aquatic environments, besides enabling a...
The facultative air breathing armoured catfishes of the Amazon drainage basin exhibit exceptional... more The facultative air breathing armoured catfishes of the Amazon drainage basin exhibit exceptional cardiac tolerance to anoxia and reoxygenation (Bailey et al., 1999). This observation is surprising, since air breathing can contribute up to 5 70 % of arterial O2 content during hypoxia (Val, 1995), uncoupling environmental and systemic oxygen debt (Brauner et al., 1995). Previous studies suggest that anaerobic heart function in these fish may be preserved by activation of ATP-sensitive K+ channels (MacCormack, T.J., Treberg, J., Almeida-Val, V.M.F., Val., A.L. and Driedzic, W.R., submitted for publication) and a high glycolytic capacity. In addition, the high levels of hexokinase (West et al., 1999), the first step in glucose utilisation, imply a high reliance on carbohydrates as a metabolic fuel when oxidative metabolism is impaired. Anecdotal evidence suggests that Glyptoperichthyes gibbiceps, a representative species of air breathing armoured catfish, has formidable hypoxia toleran...
Introducao. Impactos da aquicultura na qualidade de agua de reservatorios. O processo de eutrofiz... more Introducao. Impactos da aquicultura na qualidade de agua de reservatorios. O processo de eutrofizacao. Particularidades dos ciclos biogeoquimicos em reservatorios. O fosforo nas aguas. Dinâmica do nitrogenio nos ecossistemas aquaticos. Parâmetros de qualidade de agua, periodicidade e pontos de coleta para monitoramento da aquicultura em reservatorios continentais segundo a legislacao. Processos hidrodinâmicos em reservatorios continentais. Metodologia para avaliacao da area de influencia de atividade aquicola - Estudo de Caso do Reservatorio da PCH Lagoa Grande. Coletas de Agua em Campo. Analises laboratoriais. Interpretacao de dados de qualidade de agua da aquicultura em reservatorios continentais. Analise Temporal de Qualidade de Agua. Analise Espacial de Qualidade de Agua. Indices de qualidade de agua comumente utilizados para reservatorios. Indice de Estado Trofico - IET. Indice de Qualidade de Agua para Reservatorios ? IQAR. Indice da Comunidade Zooplanctonica para Reservatorio...
Estrutura dos tanques-rede flutuantes. Realidade amazonica. Testes com material natural disponive... more Estrutura dos tanques-rede flutuantes. Realidade amazonica. Testes com material natural disponivel na regiao. Testes com tela de alambrado revestido de PVC. Difusao de tecnologia e adocao por pequenos produtores rurais.
The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L... more The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L or lower fish did not achieve a complete anesthesia state. At 150 mg/L, MS-222 induced anesthesia within 36 seconds and recovered from a 10 minutes period of anesthesia within 5.2 min. Higher concentrations (200, 250 and 300 mg/L) anesthetized fish in lesser times, with the offset of mortality (16.7 and 3 3 . 3 % ) at the 200 and 300 mg/L MS-222 doses, respectively. The only significant differences observed in the hematological parameters, was for the glucose values in fish anesthetized with 250 and 300 mg/L. From the results, the recommended dose of MS-222 for handling matrinxã juveniles is 150 mg/L. Key-words: Brycon, matrinxã, anesthesia, MS-222, aquaculture. Dosagem Apropriada de Tricaína Metanosulfonada (MS-222) para a Indução de Anestesia em Juvenis de Matrinxã, Brycon cephalus. RESUMO Investigou-se o uso de MS-222 como anestésico para juvenis de matrinxã. Concentrações de 100 mg/...
The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L... more The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L or lower fish did not achieve a complete anesthesia state. At 150 mg/L, MS-222 induced anesthesia within 36 seconds and recovered from a 10 minutes period of anesthesia within 5.2 min. Higher concentrations (200, 250 and 300 mg/L) anesthetized fish in lesser times, with the offset of mortality (16.7 and 33.3%) at the 200 and 300 mg/L MS-222 doses, respectively. The only significant differences observed in the hematological parameters, was for the glucose values in fish anesthetized with 250 and 300 mg/L. From the results, the recommended dose of MS-222 for handling matrinxã juveniles is 150 mg/L.Investigou-se o uso de MS-222 como anestésico para juvenis de matrinxã. Concentrações de 100 mg/L ou menores não causam uma indução completa à anestesia. A 150 mg/L os peixes foram induzidos à anestesia após 36 segundos e se recuperam em 5,2 minutos após exposição ao anestésico durante 10 minuto...
Fig. 3. Net Ca2+ fluxes of Hoplosternum littorale transferred from black water (BW) to acidic bla... more Fig. 3. Net Ca2+ fluxes of Hoplosternum littorale transferred from black water (BW) to acidic black water pH 3.5 (ABW) or white water (WW) (a), and fish transferred from ABW to BW or WW (b) and fish transferred from WW to BW or ABW (c). The first bar in the left side of the figure represents the 2-4 h flux of the first exposure. Data expressed as mean ± SEM. Positive values indicate net influxes and negative values net effluxes. Asterisks (*) indicate significantly different from the same group 2 h after transfer by Kruskall- Wallis ANOVA and Mann-Whitney test (P <0.05). Crosses (+) indicate significantly different from the previous water condition by Kruskall-Wallis ANOVA and Mann-Whitney test (P <0.05).
Objetivou-se com este trabalho avaliar o efeito da ingestão de ractopamina nas concentrações 0 pp... more Objetivou-se com este trabalho avaliar o efeito da ingestão de ractopamina nas concentrações 0 ppm (controle), 10 ppm, 20 ppm e 40 ppm na ração, sobre os parâmetros fisiológicos e imunológicos, por meio da análise dos parâmetros hematológicos e da concentração sérica de cortisol e lactato, em 80 tilápias do Nilo (Oreochromis niloticus) da linhagem GIFT, com peso médio de 500 gramas, distribuídas aleatoriamente em 16 caixas d'água, com capacidade para 500 litros, com a densidade de 5 animais. Retirando-se ao dia 0 1 animal de cada caixa e cada 20 dias, 2 peixes por caixa, totalizando 8 peixes de cada tratamento. Coletaram-se amostras de sangue para dosagem de cortisol, lactato e parâmetros hematológicos (contagem de hemácias, leucócitos, proteínas totais - PPT, volume globular – VG, hemoglobina. O lactato apresentou uma diminuição significativa (p<0,05) nos dois tempos de coleta com 10 ppm (3,79 mmol/L aos 20 dias e 1,58 mmol/L aos 40 dias) e quando comparado ao controle (4,61...
Flooded areas of reservoirs and artificial lakes have been increasingly used for fish production;... more Flooded areas of reservoirs and artificial lakes have been increasingly used for fish production; however, the waste generated by aquaculture has become a concern for the sustainable development of this activity. One of the main strategies adopted by management and regulatory agencies is the use of hydrodynamic models that calculate the carrying or nutrient load capacity of a particular water body and the effect of fish farming. These models are precise in the development of optimal strategies for feeding and waste calculation. This review paper addresses this topic and describes the methodology developed for the analysis and simulation of the carrying capacity for fish production, based on the integration of the Fish‑PrFEQ nutritional bioenergetic model and the hydrodynamic model of Dillon & Rigler. This methodology allows evaluating the real contribution of aquaculture waste and assists in the planning and management of aquaculture in these aquatic environments, besides enabling a...
The facultative air breathing armoured catfishes of the Amazon drainage basin exhibit exceptional... more The facultative air breathing armoured catfishes of the Amazon drainage basin exhibit exceptional cardiac tolerance to anoxia and reoxygenation (Bailey et al., 1999). This observation is surprising, since air breathing can contribute up to 5 70 % of arterial O2 content during hypoxia (Val, 1995), uncoupling environmental and systemic oxygen debt (Brauner et al., 1995). Previous studies suggest that anaerobic heart function in these fish may be preserved by activation of ATP-sensitive K+ channels (MacCormack, T.J., Treberg, J., Almeida-Val, V.M.F., Val., A.L. and Driedzic, W.R., submitted for publication) and a high glycolytic capacity. In addition, the high levels of hexokinase (West et al., 1999), the first step in glucose utilisation, imply a high reliance on carbohydrates as a metabolic fuel when oxidative metabolism is impaired. Anecdotal evidence suggests that Glyptoperichthyes gibbiceps, a representative species of air breathing armoured catfish, has formidable hypoxia toleran...
Introducao. Impactos da aquicultura na qualidade de agua de reservatorios. O processo de eutrofiz... more Introducao. Impactos da aquicultura na qualidade de agua de reservatorios. O processo de eutrofizacao. Particularidades dos ciclos biogeoquimicos em reservatorios. O fosforo nas aguas. Dinâmica do nitrogenio nos ecossistemas aquaticos. Parâmetros de qualidade de agua, periodicidade e pontos de coleta para monitoramento da aquicultura em reservatorios continentais segundo a legislacao. Processos hidrodinâmicos em reservatorios continentais. Metodologia para avaliacao da area de influencia de atividade aquicola - Estudo de Caso do Reservatorio da PCH Lagoa Grande. Coletas de Agua em Campo. Analises laboratoriais. Interpretacao de dados de qualidade de agua da aquicultura em reservatorios continentais. Analise Temporal de Qualidade de Agua. Analise Espacial de Qualidade de Agua. Indices de qualidade de agua comumente utilizados para reservatorios. Indice de Estado Trofico - IET. Indice de Qualidade de Agua para Reservatorios ? IQAR. Indice da Comunidade Zooplanctonica para Reservatorio...
Estrutura dos tanques-rede flutuantes. Realidade amazonica. Testes com material natural disponive... more Estrutura dos tanques-rede flutuantes. Realidade amazonica. Testes com material natural disponivel na regiao. Testes com tela de alambrado revestido de PVC. Difusao de tecnologia e adocao por pequenos produtores rurais.
The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L... more The use of MS-222 as an anesthetic for matrinxã juveniles was investigated. At dosage of 100 mg/L or lower fish did not achieve a complete anesthesia state. At 150 mg/L, MS-222 induced anesthesia within 36 seconds and recovered from a 10 minutes period of anesthesia within 5.2 min. Higher concentrations (200, 250 and 300 mg/L) anesthetized fish in lesser times, with the offset of mortality (16.7 and 3 3 . 3 % ) at the 200 and 300 mg/L MS-222 doses, respectively. The only significant differences observed in the hematological parameters, was for the glucose values in fish anesthetized with 250 and 300 mg/L. From the results, the recommended dose of MS-222 for handling matrinxã juveniles is 150 mg/L. Key-words: Brycon, matrinxã, anesthesia, MS-222, aquaculture. Dosagem Apropriada de Tricaína Metanosulfonada (MS-222) para a Indução de Anestesia em Juvenis de Matrinxã, Brycon cephalus. RESUMO Investigou-se o uso de MS-222 como anestésico para juvenis de matrinxã. Concentrações de 100 mg/...
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