Faculty of Agricultural Science, Guangdong Ocean University, Zhanjiang, China.
These authors contributed equally to this work *Address for correspondence: Hiroshi Sato, Laboratory of Parasitology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan. E-mail:
Folia Parasitol (Praha). 2024 Oct 15;71:2024.018. doi: 10.14411/fp.2024.018.
Multivalvulidan myxosporeans (Multivalvulida) of the genera Unicapsula Davis, 1924 and Kudoa Meglitsch, 1947 are mostly causative agents of latent and imperceptible infection in marine fishes. However, they are sometimes incriminated in causing post-mortem myoliquefaction or unsightly cyst formation in commercial fish. Despite the great commercial impacts of multivalvulidan infection, the biodiversity, host range and epidemiology of multivalvulidan species remain to be explored further, including infection of alternative annelid hosts. Therefore, this study aimed to identify multivalvulidan species and their host and/or distribution records in commercial fishes in China. Multivalvulidan infection was detected in ten commercial fish species of seven families from the South and East China Seas (Northwest Pacific Ocean) and the Eastern Central Atlantic Ocean (an imported Dagetichthys lusitanicus [de Brito Capello]). Based on morphological and molecular-genetic analyses of their small and large subunit of ribosomal RNA genes, five new host and/or geographical distribution records for five fish species are presented, and three new species in five fish species are described, namely Kudoa neoscomberomori sp. n. in Scomberomorus commerson (Lacépède); Kudoa pilosa sp. n. in Helicolenus hilgendorfi (Döderlein) (type host) and Sebastiscus tertius (Barsukov et Chen); and Kudoa tumidisporica sp. n. in Photopectoralis bindus (Valenciennes) (type host) and Nuchequula nuchalis (Temminck et Schlegel). This study provides new data on multivalvulidan diversity in the ocean ecosystem.
多瓣型粘孢子虫（Multivalvulida）的属 Unicapsula Davis，1924 和 Kudoa Meglitsch，1947 主要是海洋鱼类潜伏和不可察觉感染的病原体。然而，它们有时也被归咎于导致商业鱼类死后肌肉液化或难看的囊肿形成。尽管多瓣型粘孢子虫感染具有巨大的商业影响，但多瓣型粘孢子虫物种的生物多样性、宿主范围和流行病学仍有待进一步探索，包括替代环节动物宿主的感染。因此，本研究旨在鉴定中国商业鱼类中的多瓣型粘孢子虫物种及其宿主和/或分布记录。在中国南海和东海（西北太平洋）和东中大西洋（进口的 Dagetichthys lusitanicus [de Brito Capello]）的七个科的十种商业鱼类中检测到多瓣型粘孢子虫感染。基于小亚基和大亚基核糖体 RNA 基因的形态和分子遗传分析，提出了五个新的宿主和/或地理分布记录，描述了五个鱼类物种中的三个新物种，即 Scomberomorus commerson（Lacépède）中的 Kudoa neoscomberomori sp. n.； Helicolenus hilgendorfi（Döderlein）（模式宿主）和 Sebastiscus tertius（Barsukov et Chen）中的 Kudoa pilosa sp. n.；以及 Photopectoralis bindus（Valenciennes）（模式宿主）和 Nuchequula nuchalis（Temminck et Schlegel）中的 Kudoa tumidisporica sp. n.。本研究为海洋生态系统中的多瓣型粘孢子虫多样性提供了新的数据。
