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Vertebral abnormality in Hatchery-reared River puffer, Takifugu obscurus fingerlings  

Park, Sung-Woo (Department of Aquatic life Medicine, Kunsan National University)
Kang, Kook-Hee (Department of Aquatic life Medicine, Kunsan National University)
Publication Information
Journal of fish pathology / v.20, no.2, 2007 , pp. 129-137 More about this Journal
Abstract
Skeletal deformity in hatchery-reared river puffer (Takifugu obscurus) fingerlings occurred. The vertebral abnormality was recognized with naked eyes 80 days after hatching. Affected fish had a good appetite but no clinical signs were found except the vertebral abnormality. As more than 90% of the hatchery-reared fish exhibited vertebral abnormality, the fingerlings could not be used for commercial seeds any more. Morphological changes in the vertebrate and the swim bladder were observed with a soft X-ray. Histopathological changes on the caudal muscle around the deformed vertebrae, gill, and spleen were also examined to clarify the cause of the deformity. Spinal curvature occurred between vertebrae 10 and 12, but any malfunction of the swim bladder was not found. The diameters of the muscle fibers around the deformed vertebrae were much smaller and more irregular than those in normal fish, and the gabs between the fiber bundles were greatly enlarged. No evidence of inflammation response was found in the muscle layer. In the hatchery, feed was putting at the position of water inflow, which might attract the fingerings to move toward the feed in spite of incomplete development of their caudal muscle fibers. From these results, it is suggested that the high speed of water current in rearing aquaria might be associated with the development of vertebral abnormality.
Keywords
River puffer; Takifugu obscurus; Vertebral abnormality; Histopathology;
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Times Cited By KSCI : 2  (Citation Analysis)
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