جستجوی مقالات مرتبط با کلیدواژه « ماهی شانک زرد باله » در نشریات گروه « شیلات »

Mercury causes oxidative stress in the body by producing oxygen free radicals and destroying antioxidant sources. The most important application of selenium is its role in the construction of antioxidant enzymes such as glutathione peroxidase, the function of which is to eliminate free radicals and reactive oxygen species. The aim of this study was to investigate the antioxidant effect of selenium nanoparticles and sodium selenite on biochemical parameters and antioxidant defense in Acanthopagrus latus in the presence of mercury chloride. A total number of 300 fish (25±3 g) were randomly distributed in five groups according to diet: control, nanoSe and sodium selenite (1 and 1.5 mg/kg). Fish were fed with experimental diets for six weeks. They were then exposed to a sublethal dose of HgCl2 for two weeks. At the end of the feeding period and after exposure, blood and liver samples were taken from all treatments and the activity of liver enzymes and antioxidants were measured. After six weeks of feeding the results showed that the form of selenium nanoparticles improved growth performance, increased the activity of antioxidant enzymes GPX and CAT and reduced the content of MDA, AST and ALT (p<0.05). The results showed that the form of selenium nanoparticles was more effective than the inorganic form of selenium during the period of exposure in increasing the activity of the antioxidant enzymes GPX and CAT. Decreased MDA content in the liver of fish fed selenium nanoparticles indicated a reduction in lipid peroxidation and a reduction in oxidative stress. The activity of ALT, AST and ALP enzymes increased more in the groups fed with selenium sodium than in the groups fed with nanoparticles (p<0.05). This study showed that the addition of selenium nanoparticles to the basic diet was more effective in terms of growth and antioxidant indices in yellowfin porgy (A. latus) after exposure to mercury chloride.

In this study, the effects of both mineral and nanoparticles selenium were investigated on growth performance, liver enzymes, and antioxidant status of yellowfin porgy, Acanthopagrus latus. A total number of 300 fish (average weight = 25±3 g) were randomly distributed in five groups according to according to diet: control (basal diet), nanoSe (1 and 1.5 mg/kg -supplemented diet) and sodium selenite (1 and 1.5 mg/kg -supplemented diet). Fish were fed with experimental diets for six weeks. At the end of the experiment, liver and blood samples obtained to assay the liver and antioxidant enzymes activities. The results showed that addition of 1 and 1.5 mg/kg nanoSe to the diet promoted growth, as weight gain increased significantly in A. latus fed by nanoSe (p<0.05). Also, the highest glutathione peroxide and catalase activity were recorded in treatment containing nanoSe (p<0.05). While the lowest ALT activity were seen in 1.5 mg/kg nanoSe (p<0.05). The lowest level of Malondialdehyde (MDA) was in the liver of fish fed by nanoSe, while there were no significant differences with the control and Sodium Selenite groups (p>0.05). Our findings showed that Selenium nanoparticles had beneficial effects on growth performance and antioxidant defense system of A. latus.

The present study investigated effects of starvation on growth, body chemical composition and non-specific immune parameters in yellow fin seabream. In this study, 120 fish with a mean length of 8.05± 0.98 cm and weight of 7.46± 1.07 g (was referred as size A) and 120 fish with a mean length of 11.05 ± 0.86 cm and weight of 18.01± 3.07 g (was referred size B) were used with each size was comprised of those fed and starved with three replicates (20 fish per replicate) in a 60- L plastic tanks. The specimens were sampled at 10, 20 and 30 days of food deprivation. The results showed that in starved group of size A, specific growth ratio (SGR), condition factor (CF), final weight, increased weight gain (IWG), hepatic- somatic index (HSI), decreased significantly (P

L- carnitine has been recognized as a new and important dietary supplementation, essential for human and animal nutrition. This study was conducted to evaluate the use of dietary l- carnitine supplementation and its effects on the growth (body final weight, daily growth rate (DGR), feed efficiency (FE), feed conversion ratio (FCR), daily feed intake (DFI), protein efficiency ratio (PER), lipid efficiency ratio (LPE), protein productive value (PPV), lipid productive value (LPV), body compositions (crude protein, crude lipid, ash and moisture), body fatty acid profile and IGF-1 activity in yellowfin seabream. In this study, a number of 240 fish with a mean weight of 3.23± 0.46 g were randomly allocated into four groups (three replicates, 20 fish per tank) in 60-L plastic tanks and fed with four experimental diets having carnitine with the concentrations 0, 400, 800, and 1200 mg kg-1 diet (referred as C0, C400, C800 and C1200 respectively). After 9 weeks of the feeding trial, there was a significant increase in growth performance (except for DGR), carcass quality (crude protein and crude lipid), muscle fatty acid and IGF‑1 activity in the fish fed C800 diet compared to those fed the other diets. Also a positive correlation was detected between plasma IGF-1 activity and DGR except for C1200 diet. The diet containing 800 mg kg-1 dietary L‑carnitine can have marked effects on growth yield, carcass quality, IGF-1 activity and lipid metabolism of yellowfin seabream