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Jun Nagata, Sayo Morimoto, Makoto Ameno, Keito Yamaguchi, Ken-ichi Wat ...原稿種別: Short Communication
2024 年 59 巻 3 号 p. 91-94
発行日: 2024/09/15
公開日: 2024/10/07
ジャーナル 認証ありEffect of povidone-iodine (PVI) treatment on the viability of Renibacterium salmoninarum, the causative agent of bacterial kidney disease (BKD) was investigated in vitro. A novel dilution plating for Tok46 strain revealed that WOAH's shortest recommended treatment for hardened eggs (100 ppm available iodine for 10 min) achieved 4.6-log reduction in the colony-forming units. Treatment with higher concentrations of available iodine achieved further reduction. The effectiveness at 100 ppm was validated across two additional strains by turbidity measurements. The disinfection using the conventional procedures likely reduces transmission risk of BKD while those with higher concentration of PVI will be more effective.
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Shotaro Izumi原稿種別: Short Communication
2024 年 59 巻 3 号 p. 95-98
発行日: 2024/09/15
公開日: 2024/10/07
ジャーナル 認証ありNumerous blackish-brown foreign bodies of varying sizes were found in the abdominal cavity of a wild surge grouper Epinephelus socialis caught by angling in the Ogasawara Islands, Tokyo, Japan, in June 2023. These contained ellipsoidal to pyriform microsporidian spores, with a mean length of 5.9 μm and a width of 2.7 μm. Sequencing of the small subunit rRNA gene of the spores revealed a close phylogenetic relationship with Glugea microsporidia, including Glugea epinephelusis, G. nagelia, G. arabica, G. serranus, and G. eda. This suggests that the microsporidia belong to the genus Glugea and that the foreign bodies within the surge grouper's abdominal cavity were Glugea cysts. This study represents the first report of Glugea sp. parasitizing surge grouper.
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長澤 和也, 安信 秀樹原稿種別: 情報
2024 年 59 巻 3 号 p. 99-101
発行日: 2024/09/15
公開日: 2024/10/07
ジャーナル 認証あり2023年夏季に兵庫県内のヤマメ養殖場の飼育魚にエラオ類の寄生が見つかった。このエラオ類標本の形態学的特徴を調べ，チョウモドキに同定した。また，聞き取り調査に基づき，このヤマメ養殖場におけるチョウモドキの発生状況と対策に関する情報を記述した。チョウモドキと近縁種のチョウは養殖魚に寄生して問題になることがあるものの，形態が酷似して同定が難しいので，両種の識別法についても言及した。
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