바이오플락 환경에서 넙치(Paralichthys olivaceus)의에드워드병에 대한 항생제 치료 효과
Effect of antibiotics treatment for edwardsiellosis of olive flounder Paralichthys olivaceus in biofloc environment
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초록
In biofloc culture for olive flounder, Paralichthys olivaceus, the possibility of antibiotics treatmentwas investigated against edwardsiellosis. After inducing edwardsiellosis by immersion in Edwardsiellatarda 1.2 × 105/mL suspension, the survival trends on various biofloc water management and somephysiological changes were observed. For biofloc water management, six types of water treatmentswere carried out, which were no exchange without antibiotics as negative control, the exchange tostored biofloc water, the exchange to stored biofloc water with 20% flow-through, the exchange tofresh biofloc water, half fresh biofloc water and half sea water, and the complete flow-through. Therewas no significant physicochemical change on water qualities in any type. The exchange to freshbiofloc water was shown the highest survival ratio as 72.3%, and in case of stored biofloc waterwith 20% flow-through, the survival ratio was also significantly high as 62%. Plasma glucose, cholesterol,total protein, calcium, and magnesium were analyzed as physiological index. Mostly, there wasno significant change, but plasma cholesterol showed an initial decrease in low survival group, andan initial increase with high survival group. Consequently, antibiotic treatment against a bacterialdisease during biofloc culture is possible as long as the biofloc water management follow alongproperly.
Abstract
In biofloc culture for olive flounder, Paralichthys olivaceus, the possibility of antibiotics treatmentwas investigated against edwardsiellosis. After inducing edwardsiellosis by immersion in Edwardsiellatarda 1.2 × 105/mL suspension, the survival trends on various biofloc water management and somephysiological changes were observed. For biofloc water management, six types of water treatmentswere carried out, which were no exchange without antibiotics as negative control, the exchange tostored biofloc water, the exchange to stored biofloc water with 20% flow-through, the exchange tofresh biofloc water, half fresh biofloc water and half sea water, and the complete flow-through. Therewas no significant physicochemical change on water qualities in any type. The exchange to freshbiofloc water was shown the highest survival ratio as 72.3%, and in case of stored biofloc waterwith 20% flow-through, the survival ratio was also significantly high as 62%. Plasma glucose, cholesterol,total protein, calcium, and magnesium were analyzed as physiological index. Mostly, there wasno significant change, but plasma cholesterol showed an initial decrease in low survival group, andan initial increase with high survival group. Consequently, antibiotic treatment against a bacterialdisease during biofloc culture is possible as long as the biofloc water management follow alongproperly.
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