NDLI: Myxosporean and microsporidian infections in cultured Pacific bluefin tuna Thunnus orientalis in Japan

Content Provider	Springer Nature Link
Author	Zhang, Jinyong Meng, Fei Yokoyama, Hiroshi Miyahara, Jiro Takami, Ikuo Ogawa, Kazuo
Copyright Year	2010
Abstract	During the parasitological survey of cultured juvenile Pacific bluefin tuna (PBT) Thunnus orientalis in 2007 and 2008, two myxosporeans and one microsporidian were found. Morphological and molecular analysis showed that the heart-infecting and brain-infecting myxosporeans are identified as Kudoa shiomitsui and K. yasunagai, respectively. This is a new host record for both species. High prevalence of infection (77–100%) with K. shiomitsui was observed in October to December (1–2 months post-transfer to sea cages), whereas only a few fish were infected with K. yasunagai. A microsporidian observed as white “cysts” in the trunk muscle of PBT had a resemblance to Microsporidium seriolae, the causative parasite of beko disease in yellowtail. Phylogenetic analysis showed that the microsporidian from PBT is closely related to but distinct from several other muscle-infecting species such as M. seriolae, Microsporidium sp. RSB, and Microsporidium sp. SH. Additionally, the spore dimension (2.7 × 1.5 μm on average) was remarkably smaller than the others. These results suggest that the present microsporidian is an undescribed species and designated Microsporidium sp. PBT. Prevalence and intensity of infection with Microsporidium sp. PBT reached a maximum of 100% and 20 cysts/fish, respectively. Although pathogenic effects of the two Kudoa species on fish health remain unknown, the microsporidian could be of concern to PBT aquaculture due to unsightly cysts in the musculature, reducing the market value of the fish.
Starting Page	981
Ending Page	990
Page Count	10
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	76
Issue Number	6
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2010-09-04
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Kudoa shiomitsui Kudoa yasunagai Microsporidium Pacific bluefin tuna Thunnus orientalis Myxosporean Microsporidian Food Science Freshwater & Marine Ecology Fish & Wildlife Biology & Management
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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