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An adult male of Argulus coregoni Thorell, 1864, was collected from the body surface of an ayu, Plecoglossus altivelis altivelis (Temminck & Schlegel, 1846), in the middle reaches of the Ani River, a tributary of the Yoneshiro River, Akita Prefecture, northern Honshu, Japan. The previous northernmost record of A. coregoni in Japan is from Fukushima Prefecture, and the present collection extends its geographical distribution from Fukushima Prefecture northward to Akita Prefecture in Japan.

これまでに北海道から報告されたチョウArgulus japonicus Thiele, 1900 には形態に関する情報が伴っていなかった．そこで，北海道余市町の一般家庭で飼育されていたコイ（ニシキゴイ）の体表から採集したチョウの形態を記載した．コイへの寄生は北海道内の観賞魚店で購入したキンギョをコイ飼育水槽に収容後に見られたため，キンギョに寄生していたチョウがコイに感染したと考えられた．また，北海道におけるチョウ属エラオ類の過去の記録を整理するとともに，1930 年に北海道南部の湖沼からカイアシ類として報告されたArgulus sp. はチョウであった可能性を示唆した．, Four females of the argulid branchiuran Argulus japonicus Thiele, 1900 were collected from the body surface of a koi carp, Cyprinus carpio Linnaeus, 1789, reared in a tank by a hobbyist in Yoichi, Hokkaido, northern Japan. Since A. japonicus was previously recorded from Hokkaido without any morphological information, the present note briefly describes the species based on the specimens collected. The infection of A. japonicus was recognized soon after goldfish, Carassius auratus (Linnaeus, 1758), purchased at a pet shop in Hokkaido were released into the tank where the koi carp was held, and it is very likely that A. japonicus from the goldfish parasitized the koi carp. The past records of A. japonicus and Argulus sp. from Hokkaido are reviewed, and the latter species reported in 1930 from lakes in southern Hokkaido is herein suggested to be A. japonicus from wild fishes.

Argulus coregoni Thorell, 1864 was collected from the body surface of ayu, Plecoglossus altivelis altivelis (Temminck & Schlegel, 1846), from six rivers in Gifu, Achi, Mie, and Shiga prefectures, central Honshu, Japan. The collection of A. coregoni from Mie Prefecture represents its new prefectural record. Salmonids have been regarded as the major hosts of A. coregoni in Japanese rivers, but the present collections suggest that ayu is also important as a riverine host of the parasite.

The lakeweed chub, Ischikauia steenackeri (Sauvage, 1883), was originally distributed in the Yodo River system including Lake Biwa, central Japan, and has recently established its populations as a domestic alien species in various inland waters in western and central Japan, including Kyushu. An adult female of Argulus japonicus Thiele, 1900 was collected from the body surface of a lakeweed chub in an irrigation canal connected to the Hase River, a tributary of the Nishi River within the Onga River system in Fukuoka Prefecture, northern Kyushu. This repersents a new prefectural and host records for A. japonicus. This parasite is considered not to have been introduced to the sampling site by I. steenackeri but to naturally occur in the river system.

An immature female of Argulus japonicus Thiele, 1900 was collected from the caudal fin of a freshwater minnow, Opsariichthys platypus (Temminck & Schlegel, 1846), in a brook, Kochi Prefecture, Shikoku, western Japan. This is the second record of A. japonicus from Shikoku and a new prefectural record for the species in Japan.

The argulid branchiuran Argulus coregoni Thorell, 1864 was collected from the body surface of wild anadromous and farmed fluvial individuals of Oncorhynchus masou ishikawae Jordan & McGregor, 1925 in Yamaguchi Prefecture, the westernmost prefecture of Honshu Island, Japan. These are the first records of A. coregoni from Yamaguchi Prefecture and extend its geographical distributional range in Japan from the neighboring Shimane and Hiroshima prefectures westward to Yamaguchi Prefecture. As fluvial individuals of O. masou ishikawae occur more widely and abundantly than anadromous ones in this prefecture, the former fish are considered to serve as the major host for A. coregoni in the rivers.

トウカイヨシノボリRhinogobius sp. TO は東海地方だけに分布する，わが国固有のハゼ科魚類である。愛知県内で採集したトウカイヨシノボリを調べたところ，カイアシ類のイカリムシLernaea cyprinacea Linnaeus, 1758とエラオ類のチョウ属の1種Argulus sp.の寄生を認めた。これらはトウカイヨシノボリに見出された最初の寄生虫であり，本魚種はそれら寄生虫の新宿主である。, The freshwater goby, Rhinogobius sp. TO, is endemic to Japan and occurs only in the Tokai District, central Honshu, Japan. The lernaeid copepod, Lernaea cyprinacea Linnaeus, 1758, and the argulid branchiuran, Argulus sp., were collected from specimens of this goby in Aichi Prefecture. These crustaceans are the first parasites found from Rhinogobius sp. TO.

長野県大桑村を流れる木曽川水系伊奈川の支流，ケサ沢で採集したヤマトイワナの体表にチョウモドキ Argulus coregoni が寄生していた．採集場所は標高1075mで，本種が自然分布する最高標高地点である．本報告では，この採集記録に加えて，わが国の高い標高の河川・湖沼から報告された魚類寄生虫の記録も収録し，カイアシ類のイワナナガクビムシ Salmincola carpionis と線虫類の Rhabdochona oncorhychi が標高1500mから採集されていた．, An adult female of the argulid branchiuran Argulus coregoni Thorell, 1864 was collected from the body surface of a yamato charr, Salvelinus leucomaenis japonicus Oshima, 1961, in the Kesa-zawa Stream, a tributary of the Ina River within the Kiso River system, at an altitude of 1075 m in Ookuwa Village, Nagano Prefecture, Honshu, central Japan. This collection represents the highest altitude record for the natural distribution of A. coregoni in Japan. This paper also compiles the past records of fish parasites collected in high-altitude water bodies of Japan: the lernaeopodid copepod Salmincola carpionis (Krøyer, 1837) and the rahbdochonid nematode Rhabdochona oncorhychi (Fujita, 1921) have been recorded from salmonids at an altitude of 1500 m.

An adult male of the argulid branchiuran Argulus coregonis Thorell, 1864 was collected from the body surface of a torrent catfish Liobagrus reinii Hilgendorf, 1878 (Siluriformes: Amblycipitidae) in the Aga River, a tributary of the Agano River, Fukushima Prefecture, central Honshu, Japan. This is the first record of A. coregoni infecting the amblycipitid fish as well as a new host record for the species. This collection also extends the distributional range of A. coregoni from Tochigi Prefecture northward to Fukushima Prefecture and is the first record of the species in the Tohoku Region of Japan.

島根県高津川水系匹見川の支流，石谷川で採集したイシドンコOdontobutis hikimiusの体表からチョウモドキArgulus coregoni Thorell, 1864の雌成体を得た。イシドンコはチョウモドキの新宿主である。また，チョウモドキはイシドンコから見出された最初の寄生虫である。, An adult female of the argulid branchiuran Argulus coregoni Thorell, 1864 was collected from the body surface of a recently described, rare odontobutid Odontobutis hikimius (called “ishidonko”) in the Ishitani River, a tributary of the Hikimi River within the Takatsu River system, Shimane Prefecture, Japan. This collection represents a new host record for A. coregoni. This branchiuran is the first species of parasite found from O. hikimius.

京都府北部を流れる由良川の源流部支流，知見谷川において手網内で魚体から離れたと思われるチョウモドキArgulus coregoni Thorell, 1864を採集した。また，大阪府高槻市にある芥川緑地資料館で飼育されていたコイCyprinus carpioの体表からチョウArgulus japonicus Thiele, 1900を採集した。チョウモドキは京都府から，チョウは大阪府から，それぞれ2度目の採集記録となる。, A male specimen of Argulus coregoni Thorell, 1864 was collected by a hand net in the Chimidani River, a tributary of the Yura River, in Miyama Town, Kyoto Prefecture, central Japan, on 16 September 2005. The specimen most likely detached from an unidentified fish (probably a fluvial amago salmon Oncorhynchus masou ishikawae) caught in the net. Specimens of Argulus japonicus Thiele, 1900 were collected from the body surface of a freshly dead common carp (Cyprinus carpio) in a rearing pond at Aquapia-Akutagawa in Takatsuki City, Osaka Prefecture, central Japan, on 26 August 2011. These collections represent the second records of A. coregoni and A. japonicus from Kyoto and Osaka prefectures, respectively.

The parasites of 45 Serrasalmus rhombeus (Linnaeus, 1776) were collected during the dry season in six floodplain lakes of the Solimões River. The prevalence was 73.3%, the mean intensity 20.5 and the mean abundance 15 crustaceans. Three species of crustaceans parasitized S. rhombeus. Two species of Copepoda infected the gill filaments, Ergasilus yumaricus Malta, 1995 and Myracetyma piraya Malta & Varella, 1993 and one of Branchiura infected the pectoral fin and gill cavity, Argulus chicomendesi Malta & Varella, 2000. Ergasilus yumaricus was the dominant species (92.3%) and the only one that showed significant differences in their abundance among the six lakes sampled. The fishes from Baixio Lake had the highest mean abundance (H = 11.2986, p = 0.04). There was a positive correlation between abundance and the total length of S. rhombeus. There was no correlation between the number of parasites and sex of S. rhombeus., Foi estudada a fauna de parasitos de 45 Serrasalmus rhombeus (Linnaeus, 1776) coletados na estação de seca em seis lagos de várzea do rio Solimões. Aprevalência foi 73,3%, a intensidade média 20,5 e a abundância média de 15 crustáceos por peixe. Três espécies de crustáceos ocorreram parasitando S. rhombeus. Duas de Copepoda parasitando os filamentos branquiais, Ergasilus yumaricus Malta, 1995 e Myracetyma piraya Malta & Varella, 1993 e uma de Branchiura parasitando a nadadeira peitoral e a cavidade branquial, Argulus chicomendesi Malta & Varella, 2000. Ergasilus yumaricus foi a espécie dominante (92,3%) e a única que apresentou diferenças significativas em suas abundâncias entre os seis lagos amostrados. Os peixes do lago Baixio apresentaram a maior média de abundância (H=11.2986; p= 0,04). Houve correlação positiva entre a abundância e o comprimento total de S. rhombeus. Não houve correlação entre o número de parasitas e o sexo de S. rhombeus.

高知県を流れる仁淀川の支流，土居川で採捕されたアユPlecoglossus altivelis altivelisの体表からエラオ類のチョウモドキArgulus coregoni Thorell, 1864を採集した。これは，四国におけるチョウモドキの初記録である。, A male specimen of Argulus coregoni Thorell, 1864 was collected from the body surface of an ayu (Plecoglossus altivelis altivelis) (Salmoniformes: Plecoglossidae) collected in the Doi River, a tributary of the Niyodo River, Kochi Prefecture, Shikoku, Japan, on August 14, 2010. This collection represents the first locality record for A. coregoni in Shikoku, one of the four major islands of Japan.

相模湾産シマアジの体表から得られたチョウ属標本を調査したところ, マツイウミチョウArgulus matuii Sikama, 1938 に同定された. この発見は本寄生虫の第3例目の記録になる. 過去に報告された本種の標本が失われているため, 今回得られた標本を用いて, 本種を再記載した., Four specimens of a poorly known argulid crustacean, Argulus matuii Sikama, 1938, were collected from body surface of the striped jack Pseudocaranx dentex (Bloch & Schneider, 1801) caught in a set net installed in the coastal waters of Sagami Bay (western North Pacific) off Manazuru, central Japan. This finding represents the third record of A. matuii. Since no specimens previously reported exist, the species is redescribed and illustrated using the newly collected specimens.

1992年6月に大分県佐伯市大入島白浜地先の佐伯湾（豊後水道）で養殖されていたヒラメ Paralichthys olivaceus 1尾の尾鰭と尾柄部にエラオ類の1種が4個体寄生していた。それらエラオ類の標本は紛失したが，写真に記録された外部形態から，これらはマツイウミチョウArgulus matuii Sikama, 1938に同定された。これは，マツイウミチョウの2度目の記録であると同時に，養殖海産魚からのマツイウミチョウの初記録である。ヒラメは新宿主である。1980～1997年の18年間に大分県沿岸で実施された魚病診断で57種8,165尾の養殖海産魚を検査したが，エラオ類の寄生は本例を含む3例のみであった。このことから，大分県の養殖海産魚ではエラオ類は極めて稀な寄生虫であると示唆された。, Four specimens of crustacean parasite were collected from the caudal fin and caudal peduncle of a bastard halibut Paralichthys olivaceus (Temminck and Schlegel) cultured in Saiki Bay, the western Bungo Channel (western North Pacific), off Shirahama, Oh-nyu Island, Saiki, Oita Prefecture, Japan in June 1992. The specimens were lost but one of them was identified as the argulid branchiuran Argulus matuii Sikama, 1938, based on its morphological characters recorded on a photograph of the whole body. This finding represents the first record of A. matuii from farmed marine fishes. P. olivaceus is a new host for A. matuii. A total of 8,165 specimens belonging to 57 species of marine fishes cultured in coastal waters of Oita Prefecture were examined for parasitic diseases for 18 years from 1980-1997, but only three cases of argulid infection, including the present case, were found, indicating that argulids are very rare parasites in finfish mariculture in this prefecture.

本州西部からチョウ属エラオ類の2種，チョウArgulus japonicus Thiele, 1900とチョウモドキA. coregoni Thorell, 1864を採集した。本地域からチョウは初記録，チョウモドキは2度目の記録になる。チョウは兵庫・島根・山口3県のコイCyprinus carpioに加えて，兵庫県の不明宿主から得られた。また兵庫県の一河川では遊泳中の個体が採集された。チョウモドキは兵庫・広島両県のアマゴOncorhynchus masou ishikawaeから得られた。, Specimens of Argulus japonicus Thiele, 1900 and A. coregoni Thorell, 1864 were collected in western Honshu, Japan. This is the first documented record of A. japonicus and the second record of A. coregoni from this region. Argulus japonicus was found to be parasitic on common carp (Cyprinus carpio) in Hyogo, Shimane and Yamaguchi prefectures and an unknown fish in Hyogo Prefecture. A swimming specimen of A. japonicus was taken in a river in Hyogo Prefecture. Argulus coregoni was sampled from river-resident and reared amago salmon (Oncorhynchus masou ishikawae) in Hiroshima and Hyogo prefectures, respectively.

1900-2009年に出版された文献に加えて,滋賀県立琵琶湖博物館に保管されている標本と栃木県中禅寺湖産ブラウントラウトから得られた標本の観察結果に基づき,以下の日本産チョウ属9種と未同定種に関する情報(異名リスト,宿主,寄生部位,地理的分布)を種ごとに整理した:マルミチョウ(新称) Argulus americanus, ホソウミチョウ Argulus caecus, チョウモドキ Argulus coregoni, チョウ Argulus japonicus, クサフグウミチョウ Argulus kusafugu, ツワモノチョウ(新称) Argulus lepidostei またはその類似種, マツイウミチョウ Argulus matuii, オノダウミチョウ Argulus onodai, ウミチョウ Argulus scutiformis, 淡水産未同定種 Argulus spp., 海産未同定種 Argulus spp. 本目録でブラウントラウト(サケ科)とコクレン(コイ科)をそれぞれわが国におけるチョウモドキとチョウの新宿主として追加した., Based on the literature published between the years 1900 and 2009 and an examination of argulid specimens deposited at Lake Biwa Museum and collected in Lake Chuzenji, a synopsis is compiled for the following 9 named species and unspecified species in Japan, which belong to the genus Argulus: A. americanus, A. caecus, A. coregoni, A. japonicus, A. kusafugu, A. lepidostei or its similar species, A. matuii, A. onodai, A. scutiformis, Argulus spp. (freshwater) and Argulus spp. (marine). Of these species, A. americanus and A. lepidostei or its similar species were introduced from the U.S.A to aquaria in Japan. This synopsis contains information for each species on its habitat (freshwater or marine), species of host(s), attachment site(s) and known geographical distribution in Japanese waters. Brown trout Salmo trutta (Salmonidae) and bighead carp Aristichthys nobilis (Cyprinidae) are recorded herein as new hosts in Japan for A. coregoni and A. japonicus, respectively.

島根県吉賀町の立河内・蓼野両地区を流れる高津川最上流部の立河内川と無名沢で採集したゴギSalvelinus leucomaenis imbrius 8尾のうち，1尾の頭部背面からエラオ（鰓尾）類チョウ科のチョウモドキArgulus coregoniの成体雄1個体を採集した。これは西日本におけるチョウモドキの初記録である。これまでにゴギからチョウモドキが採集された記録はなく，ゴギは新宿主となる。ゴギは中国地方の一部の河川にのみ生息し，調査河川でゴギ個体群は陸封・分断されており，他のサケ科魚類の放流が過去にないことから，チョウモドキはそこにもともと分布していたと考えられた。これは，チョウモドキは「多分欧州から魚の体表について移入されたものであろう」とする過去の見解を支持しない。, An adult male of Argulus coregoni Thorell, 1864 was collected from the skin of a gogi charr Salvelinus leucomaenis imbrius Jordan and McGregor (Salmoniformes: Salmonidae) in the uppermost reaches of the Takatsu River in Yoshiga, Shimane Prefecture, Japan. This finding represents the first record of A. coregoni from western Japan. Salvelinus leucomaenis imbrius is a new host for A. coregoni. This salmonid is endemic to rivers in part of the Chugoku Region, western Japan, and small isolated populations of the fish occurred at the sampling sites. No other salmonids had been stocked there. These facts indicate that A. coregoni is native to the river, which does not support the view put forward in the 1960’s that A. coregoni had been probably introduced from Europe into Japan.

English: The Soetdoring Nature Reserve is situated on the banks of the Modder River northwest of Bloemfontein. The Krugersdrift Dam forms part of the reserve and supplies water to farmers in the lower reaches of the Modder River. Twelve fish species occur in the Modder River, of which two are introduced species. Specific objectives of the study was to determine the fish parasite diversity, and to establish if any introduced fish parasites are prevalent on the fishes from the Soetdoring Nature Reserve. During monthly surveys to the Soetdoring Nature Reserve from March 2001 to March 2002 fish were collected from three different localities in the reserve. A total of eight fish species were collected, although in low numbers. The parasites collected included ciliophorans, monogeneans and parasitic crustaceans. Six known species of mobiline ciliophorans were collected from fishes, i.e. Trichodina centrostrigeata Basson, Van As & Paperna, 1983, T. heterodentata Duncan, 1977, T. mutabilis Kazubski & Migala, 1968, Tripartiella /echridens Basson & Van As, 1987, T. /eptospina Basson & Van As, 1987 and Trichodinella epizootica (Raabe, 1950). Two species of sessiline ciliophorans were also collected, namely Apiosoma sp. A and Apiosoma sp. B. Representatives of the Monogenea collected included three new species, which were described as Dacty/ogyrus freistatensis n. sp., Dogie/ius capensis n. sp. and Paradip/ozoon modderensis n. sp. as well as two known species, i.e. Dactylogyrus extensus (Mueller & Van Cleave, 1932) and Quadriacanthus aegypticus EI-Naggar & Serag, 1986. The parasitic crustaceans included one branchiuran species, Argulus japonicus Muller, 1785, and one parasitic copepod, Lamprog/ena c/ariae Fryer, 1956. This study was first to examine the whole spectrum of ectoparasites found associated with fish., Afrikaans: Die Soetdoring Natuurreservaat is op die oewers van die Modderrivier noordwes van Bloemfontein geleë. Die Krugersdriftdam vorm deel van die reservaat en voorsien water aan boere in die laer streke van die rivier. Twaalf visspesies kom in die Modderrivier voor, waarvan twee ingevoerde spesies is. Spesifieke doelstellings van die studie was om die diversiteit van visparasiete vas te stel, asook om te bepaal of ingevoerde vis parasiete enigsins op die visse van die Soetdoring Natuurreservaat voorkom. Tydens maandelikse opnames is vis van drie verskillende lokaliteite by die Soetdoring Natuurreservaat vanaf Maart 2001 tot Maart 2002 versamel. Agt visspesies is versamel waarvan die getalle min was. Parasiete wat versamel is, sluit die volgende in: verteenwoordigers van die Ciliophora, Monogenea en parasietiese Crustacea. Ses bekende spesies van die mobiele siliofore is versamel, nl. Trichodina centrostrigeata Basson, Van As & Paperna, 1983, T. heterodentata Duncan, 1977, T. mutabilis Kazubski & Migala, 1968, Tripartiella /echridens Basson & Van As, 1987, T. /eptospina Basson & Van As, 1987 en Trichodinella epizootica (Raabe, 1950). Twee spesies van sessiele siliofore is ook versamel, nl. Apiosoma sp. A en Apiosoma sp. B. Verteenwoordigers van die Monogenea sluit drie nuwe spesies in, nl. Dacty/ogyrus freistatensis n. sp., Dogie/ius capensis n. sp. en Paradip/ozoon modderensis n. sp., asook twee bekende spesies, nl. Oacty/ogyrus extensus (Mueller & Van Cleave, 1932) en Quadriacanthus aegypticus EI-Naggar & Serag, 1986. Verteenwoordigers van die parasietiese crustasieërs sluit die visluis, Argu/us japonicus Muller, 1775 en 'n verteenwoordiger van die parasietiese Copepoda, Lamprog/ena clariae Fryer, 1956 in. Die studie was die eerste om die voorkoms van die hele spektrum van ektoparasiete wat met visse geassosieer is te bestudeer., National Research Foundation (NRF)

In June, 2010 ectoparasite Argulus coregoni was found in the middle section of the Kazanka River, left tributary of the Kuybyshev Water Reservoir (Republic Tatarstan, Russia). Paper deals with issues of the geographic distribution of the species, paths of its penetration and conditions, enabling occurrence of the parasite in the river. © 2014 Begell House, Inc.

In June, 2010 ectoparasite Argulus coregoni was found in the middle section of the Kazanka River, left tributary of the Kuybyshev Water Reservoir (Republic Tatarstan, Russia). Paper deals with issues of the geographic distribution of the species, paths of its penetration and conditions, enabling occurrence of the parasite in the river. © 2014 Begell House, Inc.