عنوان مقاله [English]
Due to the scarcity of sweet water resources in the aquaculture industry to increase production, quality parameters of growth and reproduction are among the measures a farmer can take. Using diets and magnetizing fish water will result in shorter market weight and lower production cost. The present study was aimed at investigating the effect of magnetization with different cell types on the physiology of the effective factors of fish Koi. In this study, the experiment was conducted in four groups and each group with three replications for 90 days using three different strains (0.015, 0.025, and 0.045) and 72 fish of different sexes. During the experimental period of 12 h light and 12 h dark feeding, every 12 h was fed a pellet feed containing 30% protein of 3% fish weight. Repeated effect of magnetic field on water of tanks was performed once every 48 h. No significant differences were observed between the groups in terms of cholesterol analysis and repeated weight changes. The sex hormone parameters and liver enzymes and tissues of liver, kidney, and sexual organs were not significantly different (p < 0.05). The hepatic enzymes SGOT and LDH were highest in the control group (0.025 Tesla) and SGPT and ALP in the control group. The cortisol hormone in the group (0.025 Tesla) and progesterone and testosterone in the group (0.015 Tesla) were significantly different from the other groups and the group (0.045 Tesla) had the least amount of parameters. According to the best results of performance given the magnetism and high quality of food in the experimental groups, it can be concluded that due to cell membrane structures and cell tolerance threshold, the highest tissue degradation was observed in group C that received the highest magnetization (0.045 Tesla). It can be concluded that the effect of different fields on the fish body was confirmed by the results of different fields on the physiology of the fishes tested. Determining the most appropriate field intensity for use in the aquaculture industry that can both increase and reduce aquaculture costs and have no detrimental effect on aquatic physiological factors and factors will require further research and testing.
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