e-journal
The role of a specific antibody against Flavobacterium psychrophilum infection in ayu sweetfish, Plecoglossus altivelis altivelis (Temminck & Schlegel, 1846)
Flavobacterium psychrophilum is the causative agent of bacterial cold-water disease (BCWD) and causes severe loss of aquaculture production of ayu sweetfish Plecoglossus altivelis altivelis (Temminck & Schlegel, 1846) in Japan (Wakabayashi, Toyama & Iida 1994). The characteristics of BCWD in ayu are different from those of BCWD in salmonid fishes. BCWD in ayu generally occurs when water temperature is 16 to 18 °C (Miwa & Nakayasu 2005), whereas that in salmonid fishes most frequently occurs in 4–10 °C (Shotts & Starliper 1999). Clinical signs of BCWD in ayu are anaemia and ulcerative lesions on the caudal
peduncle (Iida & Mizokami 1996). However, erosion of fins and tail loss, which are typical clinical signs of BCWD in salmonid fishes (Nematollahi et al. 2003), are not observed in ayu.
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