2015
DOI: 10.1590/1982-0224-20140148
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Oxidative stress parameters in juvenile Brazilian flounder Paralichthys orbignyanus (Valenciennes, 1839) (Pleuronectiformes: Paralichthyidae) exposed to cold and heat shocks

Abstract: The aim of this study was to determine oxidative stress parameters in the liver and gill of Brazilian flounder juveniles (307.0 ± 16.0 g and 30.0 ± 4.0 cm) submitted to different water temperature (17.1, 23.0 and 28.8ºC) for 72 h and maintained at salinity 25‰. After the acclimation of 7 days, in 23ºC, fish were transferred to 200 L tanks containing seawater (salinity 25‰) at 28.8°C (heat shock), 17.1°C (cold shock) or 23.0°C (control), five replicates (five fish tank -1 ). The sampled collection occurred in 0… Show more

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Cited by 15 publications
(5 citation statements)
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“…Our results showed an increasing trend of catalase activity in the gills for 3-and 6-hour exposure period (15°C and 35°C) as compared with the muscle (6 h), indicating that the temperature stress has induced a more stubborn defence in the gills than the muscles. Such a trend was also observed in Paralichthys orbignyanus from a transition of 23°C to 28.8°C (Garcia et al, 2015). In our study, catalase antioxidant activity outweighed the LPO levels of the muscles at both the experimental temperature-time levels indicating the surprising capacity of the fish to overcome stress in a short period.…”
Section: Discussionsupporting
confidence: 83%
“…Our results showed an increasing trend of catalase activity in the gills for 3-and 6-hour exposure period (15°C and 35°C) as compared with the muscle (6 h), indicating that the temperature stress has induced a more stubborn defence in the gills than the muscles. Such a trend was also observed in Paralichthys orbignyanus from a transition of 23°C to 28.8°C (Garcia et al, 2015). In our study, catalase antioxidant activity outweighed the LPO levels of the muscles at both the experimental temperature-time levels indicating the surprising capacity of the fish to overcome stress in a short period.…”
Section: Discussionsupporting
confidence: 83%
“…However, HSPs expression is fluctuating at both stresses according to fish species (Werner et al, 2005;Wilde, 1988). Glutathione S-transferases (GST), one of the oxidative stress-related genes, its expression associated with different kinds of stressors (Almroth et al, 2015;Garcia et al, 2015). Also, Metallothioneins (MTs) are a family of stress proteins.…”
Section: Introductionmentioning
confidence: 99%
“…This important action, performed mainly by GST in gills of fish that are exposed to heat thermal stress, may indicate protection from lipid damage and explains why the LPO level presented no variation. Garcia et al (2015) noticed an increase in CAT and GST activities as well as in the levels of thiobarbituric acid reactive substances (TBARS) in the gills of Paralichthys orbignyanus that were exposed to heat thermal stress, indicating that even with the activation of antioxidant defenses, this species failed to prevent oxidative damage. In the present study, the activation of antioxidant defenses was efficient and prevented an increase in TBARS levels.…”
Section: Gill Metabolism Changes Caused By Heat Thermal Stressmentioning
confidence: 99%