Spinal curvature of cultured Japanese mackerel Scomber japonicus associated with a brain myxosporean, Myxobolus acanthogobii

Diseases of Aquatic Organisms

Mark A. Freeman Naoki Itoh Yutaka Fukuda¹  Hiroshi Yokoyama¹ 

关键词: Myxozoa;    Myxobolus;    Spinal curvature;    Parasite;    Mackerel;    Scomber japonicus;   

DOI  :  10.3354/dao066001

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Skeletal deformities were found in the cultured Japanese mackerel Scomber japonicus. External and radiographical observations showed the deformed fish to exhibit a dorso-ventral spinal curvature (kyphosis) without fracture or dislocation of the vertebrae. Numerous myxosporean cysts, ca. 0.3 to 1.0 mm in diameter, formed in the 4th ventricle, the cavity of the optic tectum, the surface of the olfactory lobe and bulb, the optic lobe and the inferior lobe of the brain. Spore morphology and molecular analysis of the small subunit ribosomal RNA gene sequence identified the myxosporean parasite as Myxobolus acanthogobii, a parasite which also causes scoliosis in yellowtail Seriola quinqeradiata. Histopathological observation showed that the myxosporean cysts were encapsulated within the host’s collagenous layer although some had disintegrated to disperse mature spores into the cranial cavity. Occasionally, lymphocytic infiltration and local granulomatous inflammation were found to be associated with spore dispersion.

【 授权许可】

Unknown