Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
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First report of gill thelohanellosis from common carp (Cyprinus carpio) fingerling in Korea

  • Mariem BESSAID (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Ki Hong Kim (Department of Aquatic Life Medicine, Pukyong National University)
  • Received : 2023.09.04
  • Accepted : 2023.09.26
  • Published : 2023.12.31
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Abstract

Myxosporeans are widespread cnidarian endoparasites in marine and freshwater ecosystems and several species were reported to be a threat to cultured fish causing serious diseases with mass mortality. In the present study, we found a myxosporean species in the genus Thelohanellus from the gills of the cultured common carp (Cyprinus carpio) fingerling for the first time in Korea. The morphological observation showed 500 ㎛ ~ 1 mm size, oval to circular shaped plasmodia containing spores which are pyriform at the anterior end and round at the posterior end (average size 20.1 ㎛ × 9.1 ㎛), with 5 to 6 turns of a single polar filament located in the polar capsule with an average size of 10 ㎛ × 4.6 ㎛. The 18S rRNA sequence was closest to the sequence of T. wangi among Thelohanellus species infecting gills but was not completely identical. Based on the morphological characteristics and molecular analysis results, we classified the present myxosporean parasite as Thelohanellus sp., temporarily. The prevalence and infection intensity of Thelohanellus sp. in the common carp fingerling were very high, which was thought to be the main cause of high mortality.

Keywords

Acknowledgement

This work was supported by a Research Grant of Pukyong National University (2023).

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