A Study on Serotyping of Cytophaga psychrophila Isolated from Fishes in Japan.

Wakabayashi, Hisatsugu; Toyama, Takashi; Iida, Takaji

doi:10.3147/jsfp.29.101

Cited by 114 publications

(87 citation statements)

References 4 publications

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“…In Japan, local and farmed ayu fish (Plecoglossus altivelis) [2,24], salmonid fish [23] and other freshwater fish are affected by cold water disease. This manifests in ayu fish as severe skin erosion and ulcers on the trunk and peduncle, and hemorrhages on the gill cover and lower jaws [12].…”

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confidence: 99%

Protection against Flavobacterium psychrophilum Infection (Cold Water Disease) in Ayu Fish (Plecoglossus altivelis) by Oral Administration of Humus Extract

Nakagawa

Iwasaki

Kodama

2009

The Journal of Veterinary Medical Science

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ABSTRACT. Humic substances are formed during the decomposition of organic matter in humus, and are found in many natural environments in which organic materials and microorganisms have been present. In the present study, oral administration of humus extract to ayu fish (Plecoglossus altivelis) induced effective protection against experimental Flavobacterium psychrophilum infection (cold water disease). Mortality of fish and development of skin lesions, such as erosion and hemorrhages on the skin, gill cover or mouth, were significantly suppressed in fish treated with 10%, 5% or 1% humus extract adsorbed on dry pellets. Although F. psychrophilum was not re-isolated from gills and erosion lesions of the skin of dead fish, bacterial gyrB DNA could be amplified in these specimens from dead fish and surviving control fish using the polymerase chain reaction. The protective effect of the extract was not the results of direct killing of bacteria or antibiotic activity of the extract since no obvious reduction in the bacterial number was observed at 5 times to 5,000 times dilution of the humus extract having pH 5.45 to 7.40. These results clearly show that treating fish with humus extract is effective in preventing cold water disease.

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Protection against Flavobacterium psychrophilum Infection (Cold Water Disease) in Ayu Fish (Plecoglossus altivelis) by Oral Administration of Humus Extract

Nakagawa

Iwasaki

Kodama

2009

The Journal of Veterinary Medical Science

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“…BCWD was first recorded in cultured ayu in 1987 (Wakabayashi et al, 1994) and later the dis ease was reported in wild ayu and pale chub Zacco platypus in 1993 (Iida and Mizokami, 1996). The dis ease has been spreading throughout Japan and causing serious damages among ayu in both farms and rivers (Inouye, 2000).…”

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Differences in Susceptibility to Flavobacterium psychrophilum among Three Stocks of Ayu Plecoglossus altivelis

Nagai¹,

Tamura

Iida³

et al. 2004

Fish Pathol.

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“…In Japan this pathogen was first isolated from ayu Plecoglossus altivelis in 1987, and has spread throughout most prefectures (Wakabayashi et al, 1994). Recently, bacterial coldwater disease has caused high mortality of ayu in farms and natural waters and is con sidered to be one of the most serious fish diseases in Japan.…”

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Efficacy of Oil-adjuvanted Vaccine for Coldwater Disease in Ayu Plecoglossus altivelis.

Rahman

Ototake²,

Iida³

et al. 2000

Fish Pathol.

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ABSTRACT--We investigated the potency of two oil adjuvants, Montanidae ISA 763A (763A) and a squalene emulsion (Squalene), to enhance the response of ayu Plecoglossus altivelis to a forma lin-killed bacterin (FKB) made from the coidwater disease etiologic agent, Flavobacterium psychrophilum.Ayu were challenged 4 wk after vaccination by an intramuscular injection with live pathogenic F. psychrophilum.Mortalities of fish injected with FKB of F. psychrophilum combined with either adjuvant showed that the adjuvanted vaccines had significantly higher (P<0.05) poten cies than the FKB vaccine alone or sterile distilled water. Moreover, both adjuvanted vaccines pro duced significantly higher antibody titers than the FKB vaccine without adjuvant.From these investigations it is concluded that the use of Squalene and 763A adjuvants provides enhanced pro tection against coldwater disease in ayu compared to the use of FKB alone.

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A Study on Serotyping of Cytophaga psychrophila Isolated from Fishes in Japan.

Cited by 114 publications

References 4 publications

Protection against Flavobacterium psychrophilum Infection (Cold Water Disease) in Ayu Fish (Plecoglossus altivelis) by Oral Administration of Humus Extract

Protection against Flavobacterium psychrophilum Infection (Cold Water Disease) in Ayu Fish (Plecoglossus altivelis) by Oral Administration of Humus Extract

Differences in Susceptibility to Flavobacterium psychrophilum among Three Stocks of Ayu Plecoglossus altivelis

Efficacy of Oil-adjuvanted Vaccine for Coldwater Disease in Ayu Plecoglossus altivelis.

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