Effect of Zeolite on the Reduction of Cadmium Toxicity in Water and a Freshwater Fish, Oreochromis mossambicus

James, R; Sampath, K

doi:10.1007/s001289900863

Cited by 40 publications

(25 citation statements)

References 6 publications

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“…In this study, a signifi cant reduction in the RNA-DNA ratio was found in the CBZ treatment group with the highest concentration (E3 group) after 42 days' exposure. These results are in agreement with the previous studies carried out in fi sh that found a depressed RNA-DNA ratio after chronic exposure to metal and organic contaminants (Barron and Adelman, 1984;James and Sampath, 1999;Varo et al, 2007). However, some other studies have also suggested that the application of RNA-DNA ratio to evaluate the eff ects of toxicants on fi sh is questionable, because they did not fi nd any relation between the RNA-DNA ratio and the changes in environmental contaminants (Mckee et al, 1989;DeBoeck et al, 1997;Kim and Kang, 2004).…”

Section: Energy Metabolic Parameterssupporting

confidence: 91%

Physiological condition status and muscle‐based biomarkers in rainbow trout (Oncorhynchus mykiss), after long‐term exposure to carbamazepine

Li¹,

Žlábek²,

Velíšek³

et al. 2009

J of Applied Toxicology

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Recently, residual pharmaceuticals are generally recognized as relevant sources of aquatic environmental pollutants. However, the toxicological effects of these contaminants have not been adequately researched. In this study, the chronic toxic effects of carbamazepine (CBZ), an anticonvulsant pharmaceutical commonly present in surface and ground water, on physiological condition status and muscle-based biomarkers of rainbow trout were investigated. Fish were exposed at sublethal concentrations of CBZ (1.0 microg l(-1), 0.2 mg l(-1) and 2.0 mg l(-1)) for 42 days. Compared with the control, there was a significant lower (P < 0.05) condition factor in fish exposed at the highest concentration of CBZ (2.0 mg l(-1)), but the hepatosomatic indices in all groups were not significant changes. At lower CBZ concentration (1.0 microg l(-1), 0.2 mg l(-1)), the antioxidant enzyme activities were induced slightly, except catalase, while at the highest concentration (2.0 mg l(-1)) oxidative stress was apparent as reflected by the significant higher lipid peroxidation and protein carbonyls in the fish muscle, associated with a significant inhibition of antioxidant enzymes activities. Moreover, energy metabolic parameters (RNA-DNA ratio, Na(+)-K(+)-ATPase) were significantly inhibited in muscle of the fish exposed at the highest concentration (2.0 mg l(-1)), compared with the control. In short, CBZ-induced physiological and biochemical responses in fish were reflected in parameters measured in this study, which suggest that these biomarkers could be used as potential indicators for monitoring residual pharmaceuticals present in aquatic environment.

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Section: Energy Metabolic Parameterssupporting

confidence: 91%

Physiological condition status and muscle‐based biomarkers in rainbow trout (Oncorhynchus mykiss), after long‐term exposure to carbamazepine

Li¹,

Žlábek²,

Velíšek³

et al. 2009

J of Applied Toxicology

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“…The water parameters and quality were measured at the beginning and daily at the end of the experimental period. The fish were fed ad libitum with tropical fish chow (Purina Ltda, Campinas, SP, Brazil) with optimal protein concentration (38%) for Oreochromis (James & Sanpath, 1999). The animals were fed daily (3% of body mass) in the morning (at 9:00 to10:00 h) and the unfed diet remains were collected after 30 min and dried to constant weight.…”

Section: Methodsmentioning

confidence: 99%

“…In fish groups kept under 1.24 and 20.48 mg Cd/L, the mortality was 20% and 40%, respectively. A concentrated solution of cadmium was prepared by dissolving CdCl 2 in one liter of distilled water, and this mixture was diluted with tap water to obtain the desired concentration for the experiment (James & Sanpath, 1999). Fish were exposed to cadmium for 15 days.…”

Section: Methodsmentioning

confidence: 99%

Oxidative stress biomarkers and aggressive behavior in fish exposed to aquatic cadmium contamination

et al. 2009

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The objective of this study was to investigate the possible link between cadmium exposure, hepatic markers of oxidative stress and aggressive behavior in Nile tilapia (Oreochromis niloticus). Fish were first exposed to 0.75 mg/L CdCl 2 for 15 days (12 isolated fish for each group) and afterward a behavioral test was performed. Fish from the control and cadmium-exposed groups were paired for 1 h (6 pairs of fish per group) for determination of aggressiveness parameters. Immediately after the behavioral test, the animals were sacrificed and the liver was used to determine biochemical parameters. Cadmium decreased aggression in Nile tilapia. Subordinate animals exposed to cadmium showed decreased glutathione peroxidase (GSH-Px) activity compared to dominant ones. No alterations were observed in selenium-dependent glutathione peroxidase Se-GSH-P and Cu-Zn superoxide dismutase activities, but total superoxide dismutase activity was increased in subordinate animals exposed to cadmium compared to subordinate control. Catalase activity was increased in cadmium-exposed fish. Lipoperoxide concentrations also increased in cadmium exposed fish indicating that cadmium toxicity may affect oxidative stress biomarkers in Nile tilapia. Social stress induced lipoperoxidation in Nile tilapia, and subordinate animals exposed to cadmium responded with lower activities of liver antioxidant enzymes compared to dominant fish. The present study shows that cadmium exposure is capable of inducing changes in the social status and oxidative stress parameters in this species.O objetivo deste estudo foi investigar a possível relação entre a exposição ao cádmio, os marcadores hepáticos de estresse oxidativo e o comportamento agressivo em tilápia do Nilo (Oreochromis niloticus). Os peixes foram primeiramente expostos à concentração de 0,75 mg/L de CdCl 2 durante 15 dias (12 peixes isolados em cada grupo), após o qual o teste de comportamento foi aplicado. Peixes do grupo controle e do grupo exposto ao cádmio foram pareados durante 1 hora (6 pares de peixes por grupo) para determinação de parâmetros de agressividade. Imediatamente após o teste comportamental, os animais foram sacrificados e o fígado foi coletado para as determinações bioquímicas. O cádmio diminuiu a agressão em tilápias do Nilo. Animais subordinados e expostos ao cádmio mostraram uma redução na atividade da enzima glutationa peroxidase (GSH-Px), quando comparados aos dominantes. Nenhuma alteração foi observada na atividade da glutationa peroxidase dependente de selênio (Se-GSH-P) e na superóxido dismutase Cu Zn, mas a atividade total da superóxido dismutase aumentou em animais subordinados e expostos ao cádmio, quando comparado ao controle subordinado. A atividade da catalase aumentou em peixes expostos ao cádmio. As concentrações de lipoperóxido aumentaram em peixes expostos ao cádmio, indicando que a toxicidade deste pode afetar os biomarcadores de estresse oxidativo em tilápias do Nilo. O estresse social induziu lipoperoxidação em tilápia do Nilo e animais subordinados e expo...

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“…Each fish was fed daily at 14:00 h throughout the experiment, except during the fasting period, with commercial dry pellets for tropical fish (Purina ® Ltda., Campinas, SP, Brazil) corresponding to the optimal protein diet (38%) for Oreochromis, as suggested by James and Sampath (26). The quantity of food provided to each fish was 5% of their biomass (27).…”

Section: Experimental Design and Specific Proceduresmentioning

confidence: 99%

Sex-specific compensatory growth in food-deprived Nile tilapia

Barreto

Moreira

Carvalho

2003

Braz J Med Biol Res

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Female Nile tilapia incubate fertilized eggs in their mouth until they are released as alevins. Consequently, the female may not eat during this period. Thus, it would be expected that female Nile tilapia are more adapted to recovering from fasting than males, which do not display this behavior. To test this hypothesis we conducted an experiment with two groups of fish consisting of 7 males and 7 females each, with one fish per aquarium. The experiment was divided into three phases involving adjustment of the animals to experimental aquaria (0-15th day), fasting (16th-27th day), and refeeding (27th-42nd day). Compensatory growth performance was assessed by specific growth rate, weight, food conversion efficiency and food intake. Food conversion efficiency increased after fasting with a similar rate for both sexes. However, specific growth rate, food intake and weight gain (%) were significantly higher in males than in females in the refeeding phase. Thus, we conclude that male Nile tilapia can compensate for a fasting period more efficiently than females, refuting our hypothesis. A possible mechanism involved in the greater male compensation is that they presented greater hyperphagia than females, concomitantly with a similar rate of food conversion efficiency for both sexes during refeeding, which would probably be provoking greater growth in males.

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Effect of Zeolite on the Reduction of Cadmium Toxicity in Water and a Freshwater Fish, Oreochromis mossambicus

Cited by 40 publications

References 6 publications

Physiological condition status and muscle‐based biomarkers in rainbow trout (Oncorhynchus mykiss), after long‐term exposure to carbamazepine

Physiological condition status and muscle‐based biomarkers in rainbow trout (Oncorhynchus mykiss), after long‐term exposure to carbamazepine

Oxidative stress biomarkers and aggressive behavior in fish exposed to aquatic cadmium contamination

Sex-specific compensatory growth in food-deprived Nile tilapia

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