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The Growth Impact Of Extremely Low Frequency Electromagnetic Fields On Tilapia And Its Mechanism Analysis

Posted on:2013-12-12Degree:MasterType:Thesis
Country:ChinaCandidate:B X RuFull Text:PDF
GTID:2230330392456279Subject:Ecology
Abstract/Summary:PDF Full Text Request
In order to explore the extremely low frequency electromagnetic fields on biologicaleffects and its mechanism of action of the fish, tilapia juveniles, are designed forextremely low frequency electromagnetic field exposure of laboratory tests. In thelaboratory experiment, tilapia juveniles exposed to different intensities of extremely lowfrequency electromagnetic field environment in feeding (the magnetic field strengthrespectively0μT,30μT100μT,200μT), extremely low frequency electromagnetic fieldsaround the clock exposure, observation of fish behavior, in the10d,20d30d and stopexposuring according to the15d, the measurement of the body of the tilapia, a totallength, body height, weight, Condition factor, and specific growth rate targets, andtilapia pepsin activity and intestinal protease activity were measured and Tilapia behaviorobserved during the experiment. Experimental results show that: the performance of theexposed tilapia group’s behavior is calm and fond of staying in the bottom of the aquariumto maintain a normal feeding behavior, no difference in food intake with the control group;Extremely low frequency electromagnetic fields have inhibition on the growth of tilapiajuveniles and digestive enzyme activity, in which100μT extremely low frequencyelectromagnetic fields’ inhibition is largest,30μT followed,200μT’s inhibition is thesmallest, suggesting that extremely low frequency electromagnetic fields existing"window " feature on tilapia biological effect; It was found that the physiological effectsof ELF on the impact of tilapia show earlier in the growth effect, analysis of therelationship between the tilapia growth indicators and the activities of digestive enzymesduring extremely low frequency electromagnetic field exposure, founding a significantcorrelation between them, we believe that extremely low frequency electromagnetic field’inhibition on the growth is due to its digestive protease activity reduction, especially dueto reduction of pepsin activity. The experiments also showed that tilapia digestive enzyme activity can be restored after30~200μT extremely low frequency electromagnetic fieldexposure stopped.
Keywords/Search Tags:Extremely low frequency electromagnetic fields, Tilapia, Biological effects, Growth index, Digestive protease activity
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