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1- Department of Aquaculture, Faculty of Fisheries, Recep Tayyip Erdoğan University, Rize, Türkiye , mert.minaz@erdogan.edu.tr
2- Department of Aquaculture, Faculty of Fisheries, Recep Tayyip Erdoğan University, Rize, Türkiye
2- Department of Aquaculture, Faculty of Fisheries, Recep Tayyip Erdoğan University, Rize, Türkiye
Abstract: (97 Views)
The Danube sturgeon (Acipenser gueldenstaedtii), classified as an endangered species, is susceptible to pathogenic microorganisms in both aquaculture systems and natural habitats, potentially leading to fatal infections. This study investigated the physiological and pathological responses of juvenile Danube sturgeon to Aeromonas hydrophila infection. Fish were intraperitoneally injected with 0.1 mL of A. hydrophila suspension (1 × 10⁸ CFU/mL). The experiment was conducted with three replicates per group (infected and control), each containing 10 fish. Based on the challenge test results, mortality in the infected group began on day 3 and continued progressively until day 13. Additionally, swim bladder deflation, hyperemia, and hemorrhaging in the visceral organs were observed. Hematological analysis revealed that LYM, HGB, MCH, and MCHC values were significantly higher in the control group, whereas WBC and MCV levels were elevated in the infected group. Histopathological examination of liver tissues revealed prominent melanomacrophage centers and signs of necrosis. According to a semi-quantitative scoring model, regressive changes and inflammation were significantly higher in the infected group compared to controls (p < 0.01). In conclusion, Aeromonas hydrophila demonstrates a highly pathogenic potential for juvenile Danube sturgeon, inducing rapid systemic deterioration and significant tissue damage. The findings confirm that this bacterium is capable of causing disease and lethal outcomes within a week, emphasizing the urgent need for preventive strategies in conservation and aquaculture management of this endangered species.
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