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Hematological varieties, histological changes, and immune responses in the early stage of infection with Vibrio parahaemolyticus in Black rockfish Sebastes schlegelii

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Abstract

Black rockfish (Sebastes schlegelii) is a marine fish with high financial value; however, the frequent occurrence of bacterial diseases has caused a production decline and economic losses. This study found that hyperemia, hemorrhage, and ascites were common in S. schlegelii during the V. parahaemolyticus infection. Inflammation, degeneration, and necrosis in the liver could be observed. The epithelial mucosal integrity, the intestine epidermis thickness, the villus heights, and the number of mucous cells in the intestine were decreased after infection. Apparent differences in most of the hematological parameters between the two groups were observed, such as the corpuscular volume (CV) and NaCl concentrations of the beginning hemolysis were decreased remarkably (P < 0.01) after infecting with V. parahaemolyticus. However, the white blood cell count (WBC), lysozyme (LZM), malondialdehyde (MDA), K+, Cl, and Ca2+ were increased significantly (P < 0.01) after infection. In addition, the mRNA expressions in four tissues (gills, liver, blood, spleen) of eleven immune-related genes were investigated. The results showed that C1r, C1s, and C1inh expression varied considerably among tissues. Caspase 10 expression was reduced in four tissues after infection, but MyD88, TNF receptor, TNF-α, BAFF, IL-1β, IL-8, and IL-10 showed increased expression profiles within 24 h after infection. In particular, IL-1β expression in the liver and spleen increased 123.67 and 104.94-fold at 6 hpi, respectively. Therefore, in addition to pathology, the hematological detection and gene expression profiles could be used in the evaluation of healthy status in fish, and this study provided a preliminary basis for the diagnosis of S. schlegelii infecting with V. parahaemolyticus.

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Funding

This work was supported by the Policy Guidance Program of Jiangsu Province (grant numbers (SZ-LYG202025] and (SZ-LYG202133)), the Open Research Fund of Jiangsu Key Laboratory of Marine Biotechnology (grant numbers (HS2020003)), the Scientific Research Foundation Program of Jiangsu Ocean University (grant numbers (KQ16032)), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Funding acquisition and project administration were done by Yingli Gao. Writing—original draft preparation data were written by Yingli Gao and Gaoshang Han. Methodology and writing—reviewing and editing were performed by Lu Qiang, Liyuan Zhang, and Ruiming Tan. All authors read and approved the final manuscript.

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Correspondence to Yingli Gao.

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All animal handling procedures were performed in strict accordance with the Guide for the Care and Use of Laboratory Animals Central of Jiangsu Ocean University, and the protocol was approved by the Institutional Animal Care and Use Committee of Jiangsu Ocean University.

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Gao, Y., Han, G., Qiang, L. et al. Hematological varieties, histological changes, and immune responses in the early stage of infection with Vibrio parahaemolyticus in Black rockfish Sebastes schlegelii. Aquacult Int 31, 381–399 (2023). https://doi.org/10.1007/s10499-022-00982-9

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  • DOI: https://doi.org/10.1007/s10499-022-00982-9

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