Impact of Parasitic Isopod Cymothoa indica (Schioedte and Meiert, 1884) on Blood Parameters of the Wild Population of Host Fish Mystus gulio (Hamilton, 1822) Collected from Bahuda Estuary, Odisha, India
摘要
The catfish species Mystus gulio (Hamilton, 1822), commonly known as the long-whiskered catfish, holds significant commercial value in Asian countries due to strong market demand. The species is well-suited for aquaculture in both fresh and brackish water environments, owing to its adaptability as a euryhaline species. This study investigated the effects of the cymothoid isopod Cymothoa indica (Schioedte and Meiert, 1884) on the blood parameters of the wild population of host fish M. gulio from the Bahuda estuary, Southern Odisha, India, during 2023–24. The findings revealed significant reductions (P < 0.05) in red blood cell count, hemoglobin, hematocrit, and mean corpuscular hemoglobin concentration in infected M. gulio compared to non-infected counterparts, indicating potential respiratory complications. Although no significant differences (P > 0.05) were observed in mean corpuscular hemoglobin, mean corpuscular volume, white blood cell count, lymphocytes, and monocytes, there was a notable increase in eosinophils and neutrophils (P < 0.05) in the infected fishes, suggesting an immune response to parasite-induced inflammation. These results provide the first insights into the impact of C. indica on the hematological parameters of wild host fish M. gulio, which would aid aquaculture industries in managing the health of host fishes affected by parasitic isopods.