Fish Pathology
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
Pathological Changes in the Branchial Chamber Wall of Stingrays, Dasyatis spp., Associated with the Presence of Juvenile Gnathiids (Isopoda, Crustacea)
Yoshiharu HonmaAkira Chiba
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1991 Volume 26 Issue 1 Pages 9-16


Infestation of juvenile gnathiids, Gnathia sp., on the branchial chamber wall of two species of stingrays, Dasyatis akajei and D. matsubarai, caused proliferative inflammation of dermal tissue, and a heavy disruption of epithelia and smooth muscles. In addition to congestion of hemolytic blood cells, a prominent aggregation of heterophils, macrophages engaged in active phagocytosis, and plasma cells was also seen. It is of interest to note that evidence of a remarkable propagation of bacilli was encountered on the surface of the gnathiids and on the injured mucosal coat of the host fish. Besides a lot of blood sucking by gnathiids, bacterial infection might be one of the causes of host fish death or debility.

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© The Japanese Society of Fish Pathology
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