New host records of monacanthid fish for three kudoa spp. (k. septempunctata, k. thyrsites, and k. shiomitsui) prevalent In the olive flounder (paralichthys olivaceus), with the description Of k. parathyrsites n. sp. from a black scraper (thamnaconus modestus)
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Date
2016
Journal Title
Journal ISSN
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Publisher
Springer
Abstract
Kudoa septempunctata (Myxosporean:
Multivalvulida) is known as a cause of foodborne disease
associated with consumption of raw flesh of the olive flounder
(Paralichthys olivaceus). Knowledge of its life cycle, particu-
larly alternate annelid hosts and reservoirs or susceptible fish
hosts in natural waters, may facilitate disease control in aqua-
culture farms. Our recent survey of myxosporean infection in
monacanthid fish in natural waters around Japan revealed in-
fection with three kudoid species prevalent in the olive floun-
der, i.e., K. septempunctata, Kudoa thyrsites, and Kudoa
shiomitsui. Of the 51 black scrapers (Thamnaconus modestus)
examined, five fish were infected: two fish with
K. septempunctata and three with K. thyrsites. One of the fish
infected with K. septempunctata was also infected with a
K. thyrsites-like species. One of the 17 threadsail filefish
(Stephanolepis cirrhifer) and two of four unicorn
leatherjackets (Aluterus monoceros) were parasitized with
K. shiomitsui. Three modest filefish (Thamnaconus
modestoides) had no kudoid infection. K. septempunctata
from a black scraper fished in the Inland Sea of Japan off
Yamaguchi had 6–8 (predominantly 7) shell valves/polar cap-
sules, whereas K. septempunctata found in another black
scraper from the Sea of Japan off Tottori had 5 or 6 (predominantly 6). However, the two isolates displayed iden-
tical 18S and 28S ribosomal RNA gene (rDNA) nucleotide
sequences, which were also identical to the isolates from the
olive flounder. K. thyrsites from the Inland Sea of Japan off
Yamaguchi and Sea of Japan off Tottori and K. shiomitsui
from the Sea of Japan off Shimane and western Pacific
Ocean off Kochi were also morphologically and genetically
characterized. They were found to be coincident with the pre-
vious reports from olive flounders. Furthermore, the
K. thyrsites-like species found in a black scraper from the
Inland Sea of Japan off Yamaguchi was morphologically
and genetically characterized; a new species, Kudoa
parathyrsites n. sp., is erected for this species. The relation-
ships of the new species with K. thyrsites and related species
as well as those of K. shiomitsui with Kudoa pericardialis and
related species parasitizing the pericardium are briefly
discussed.
Description
Journal Article
Keywords
Kudoa septempunctata, Kudoa thyrsites, Kudoa parathyrsites n. sp, Kudoa shiomitsui, Kudoa pericardialis, Thamnaconus modestus, Stephanolepis cirrhifer, Aluterus monoceros, Multivalvulida