Fish Pathology
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
Studies on the Pathogenic Fungus Associated with Black Gill Disease of Kuruma Prawn, Penaeus japonicus—I.
Isolation and Identification of the BG-Fusarium
Kishio HATAIKouhei FURUYASyuzo EGUSA
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1978 Volume 12 Issue 4 Pages 219-224

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Abstract

Black gill disease of pond-cultured kuruma prawn, Penaeus japonicus was first reported by EGUSA and UEDA (1972). They demonstrated that a fungus belonged to the genus Fusarium was the causative agent and gave the fungus a temporary designation, BG-Fusarium. Since their report the disease has often broken out among pond cultured kuruma prawn in various districts.
The present authors investigated a taxonomical position of the BG-Fusarium isolated from gill lesions of kuruma prawn with black gill disease. As the result, the BG-Fusarium was identified as Fusarium solani according to BOOTH (1971, 1977) from the characteristics of the fungus on Potato Sucrose Agar.
The number of fungal elements (conidia, chlamydospore, mycelium, etc.) per g of wet sand in ponds in which black gill disease had broken out were 3.0×10-8.0×102, among which number of fungus as element of BG-Fusarium were 2.0×10-8.0×102. BG-Fusarium was not isolated from the sand of ponds in which the disease was not occurred. This fact may suggest that the sources of infection lie in the sand of culturing ponds.
BG-Fusarium was also isolated from the bottom sand of ponds which were emptied for 2 months. This fact suggested that BG-Fusarium was capable of surviving for long time in wet sand.

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© The Japanese Society of Fish Pathology
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