Kazuya Nagasawa

Hiroshima University, Hirosima, Hiroshima, Japan

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Publications (151)100.47 Total impact

  • Shusaku Otake · Kaori Wakabayashi · Yuji Tanaka · Kazuya Nagasawa
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    ABSTRACT: Choniomyzon inflatus Wakabayashi, Otake, Tanaka & Nagasawa, 2013 (Copepoda: Siphonostomatoida: Nicothoidae), an associate of the scyllarid lobster Ibacus novemdentatus Gibbes, was found to pass through at least four developmental stages: nauplius, copepodid I (CI), copepodid II or later (CII+) and adult. Free-living nauplii were observed hatching from the ovisacs of adult females. CI was found on the body surface of both female and male hosts, whereas CII+ and adult were obtained from the female host’s egg masses. The life-cycle of this copepod is presumed to be as follows: (i) nauplius develops into CI in the water column; (ii) infective CI settles on body surface of host; (iii) CI moults into the following stage, changing its microhabitat from host’s body surface to egg masses; (iv) CII+ develops on egg masses of host until adult stage; and (v) adult female and male mate on the host’s egg masses.
    No preview · Article · Feb 2016 · Systematic Parasitology
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    ABSTRACT: Parasitic copepods, especially sea lice (Caligidae) are causing economic problems in both aquaculture and to wild fishes around the world, but their study in at least some of the southeastern Asian countries, is still scanty. Here we provide new information on the distribution of 11 known species of parasitic copepods collected from 11 marine fish hosts from Iloilo, central part of the Philippines. Two species of the genus Anuretes Heller, 1865 and nine species of the genus Caligus Müller, 1785 were found to infest these hosts, i.e. Anuretes branchialis Rangnekar, 1953 from Platax orbicularis (Forsskål, 1775); A. plectorhynchi Yamaguti, 1936 from P. orbicularis and Plectorhinchus pictus (Tortonese, 1936); Caligus absens Ho, Lin et Chen, 2000 from Priacanthus macracanthus Cuvier in Cuvier & Valenciennes, 1829; C. asymmetricus Kabata, 1965 and C. coryphaenae (Steenstrup & Lütken, 1861) from Auxis thazard thazard (Lacepède, 1800); C. bonito Wilson, 1905 from Coryphaena hippurus Linnaeus, 1758; C. cordyla Pillai, 1963 from Megalaspis cordyla (Linnaeus, 1758); C. cornutus Heegaard, 1962 from Sphyraena jello Cuvier in Cuvier & Valenciennes, 1829; C. epinepheli Yamaguti, 1936 from Scomberoides commersonnianus Lacepède, 1801; C. kanagurta Pillai, 1961 from Decapterus kurroides Bleeker, 1855, D. macarellus (Cuvier in Cuvier & Valenciennes, 1833) and C. hippurus; and C. rotundigenitalis Yü, 1933 from Scatophagus argus (Linnaeus, 1766). Attachment sites included the gill filaments and the body surface. Prevalence and mean intensity of caligids are provided in addition to an update on the checklist of caligids of the Philippines. Although reports on caligids in the Philippines are few, the published records indicate that sea lice are widely distributed throughout the archipelago.
    No preview · Article · Dec 2015 · Zootaxa
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    Daisuke Uyeno · Danny Tang · Kazuya Nagasawa

    Full-text · Article · Nov 2015
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    Hirotaka Katahira · Kazuya Nagasawa
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    ABSTRACT: A parasitic nematode from the stomach of Japanese eel Anguilla japonica Temminck et Schlegel in western Japan, previously identified as Heliconema longissimum (Ortlepp, 1922), was morphologically re-examined and compared with the previous descriptions. In addition, the third-stage larva of this nematode is described, based on the specimens of encapsuled larvae found in musculature of two crabs, Hemigrapsus sp. and Perisesarma bidens (De Haan), caught from the upper-intertidal zone of the same locality. As a result of the morphological observation, seven pairs of postcloacal papillae in adult males are confirmed. This matches with the character of H. longissimum, but the shape of the fifth postcloacal papillae differs between the present material and H. longissimum; the former possesses pedunculate papillae in the fifth pair whereas the latter has sessile papillae. Since the pedunculate papillae can be found in the original description and the syntype specimens of H. anguillae Yamaguti, 1935 that has been synonymised with H. longissimum, we thus here resurrect H. anguillae as an accepted species. For the life-cycle of the present nematode, littoral crabs, including the two infected species, are likely to be the source of infections for Japanese eels, acting as intermediate hosts.
    Preview · Article · Jun 2015 · Folia parasitologica
  • Hirotaka Katahira · Kazuya Nagasawa
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    ABSTRACT: Five helminths, including a new echinorhynchid acanthocephalan Acanthocephalus longiacanthus n. sp., are described based on specimens from the giant mottled eel Anguilla marmorata Quoy & Gaimard caught in a small river, western Japan. The new acanthocephalan is distinguished from the other congeners in terms of hook arrangement (8-9 longitudinal rows with 5-6 hooks per row) on proboscis, maximum length of hook blade (81-95 μm in male, 150-190 μm in female), lemnisci being longer than proboscis receptacle, and small-sized eggs (80-83 μm). Two monogeneans, Pseudodactylogyrus anguillae (Yin & Sproston, 1948) and P. bini (Kikuchi, 1929), and two acanthocephalans, Acanthocephalus gotoi Van Cleave, 1925 and Southwellina hispida (Van Cleave, 1925), were also found; this new material is described. The monogeneans are notorious as invasive parasites spreading worldwide via anthropogenic transportations of anguillid eels, but in Japanese waters A. marmorata appears to be an indigenous host for these parasites. Anguilla marmorata is a new host record for the acanthocephalans A. gotoi and S. hispida.
    No preview · Article · May 2014 · Systematic Parasitology
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    ABSTRACT: A redescription of the caligid copepod Lepeophtheirus acutus Heegaard, 19436. Heegaard , P. 1943. Some new caligids from the Gilbert Islands. Ark Zool., 34: 1–12. View all references is provided based on mature adults of both sexes collected from two new elasmobranch hosts, the Alfred manta Manta alfredi (Krefft, 1868) and the whale shark Rhincodon typus Smith, 1828, held in sea pens off Okinawa-jima Island, Japan. Lepeophtheirus acutus can be distinguished from other congeners by a combination of adult female characters that includes: (1) abdomen about one-third length of cephalothorax; (2) sternal furca with long, apically pointed tines; (3) leg 2 endopod with a row of large denticles and a spiniform projection on the distolateral corner of the first and second segments, respectively; (4) leg 3 endopod with six setae on the distal segment; and (5) leg 4 exopod with an armature of I-0; III. This report also confirms the observation of previous workers that L. acutus is a pathogen of elasmobranchs held in captivity.
    Full-text · Article · Mar 2013 · Journal of Natural History
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    Kazuya Nagasawa · Danny Tang · Daisuke Uyeno · Ione Madinabeitia
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    ABSTRACT: This note reviews the work done by Ju-shey Ho, currently Professor Emeritus at California State University, Long Beach, CA, USA, on the systematics of symbiotic copepods from aquatic animals in Japanese waters. Since 1980, he has reported 110 species of symbiotic copepods from Japanese fish and marine invertebrates, including those representing one new family, seven new genera and 41 new species, and has greatly contributed to clarifying the symbiotic copepod fauna of Japan. Research using symbiotic copepods as bioindicators of the phylogeny and evolution of host animals was conducted by him for the first time in Japan. He also made significant contributions to the taxonomy and biology of caligid copepods, a group that poses a serious threat to the aquaculture industry, found on farmed fish in Japan.
    Full-text · Article · Feb 2013 · Journal of Natural History
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    Kaori Wakabayashi · Shusaku Otake · Yuji Tanaka · Kazuya Nagasawa
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    ABSTRACT: A new species of parasitic copepod, Choniomyzon inflatus n. sp., is described based on specimens collected from the external egg masses of the smooth fan lobster Ibacus novemdentatus Gibbes captured in the North Pacific Ocean off Ainan, Ehime Prefecture, western Japan. The new species differs from its congeners in having a globular to ovoid prosome, in bearing asymmetrically arranged denticles at a rounded apex of both the terminal segment of the antenna and the maxilliped, and in lacking serrate lobes on the basis of legs 1 and 2. The species is similar in size and shape to the host's eggs, which may be interpreted as egg mimicry. The new species is the first member of Choniomyzon Pillai, 1962 from subtropical regions.
    Full-text · Article · Feb 2013 · Systematic Parasitology
  • Daisuke Uyeno · Kazuya Nagasawa
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    ABSTRACT: Four new species of the genus Hatschekia Poche, 1902 (Copepoda: Siphonostomatoida: Hatschekiidae) are described based on female specimens collected from pufferfishes (Tetraodontiformes: Tetraodontidae) caught in coastal waters off the Ryukyu Islands, Japan: H. longiabdominalis sp. n. on Arothron hispidus (Linnaeus), H. geniculata sp. n. on A. hispidus (type host) and A. stellatus (Bloch et Schneider), H. ellipsocorpa sp. n. on A. mappa (Lesson), and H. boonah sp. n. on A. nigropunctatus (Bloch et Schneider) (type host) and A. meleagris (Schneider). Hatschekia longiabdominalis sp. n. and H. boonah sp. n. differ from all other congeners by sharing an unusual, projected abdomen and a fusiform trunk with posterior lobes; these two species are differentiated from each other by the shape of the dorsal chitinous frame on the cephalothorax. Hatschekia geniculata sp. n. can be distinguished by the combination of the following morphological characters: a rhomboidal cephalothorax with a pair of lateral conical protrusions, a cylindrical trunk with posterior lobes and a bent abdomen with a dorsal protrusion. Hatschekia ellipsocorpa sp. n. resembles H. pholas (Wilson, 1906) but can be distinguished from the latter by the possession of one distal and one inner setae on the terminal endopodal segment of legs 1 and 2. Hatschekiapholas is also redescribed based on female specimens from the tetraodontid A. stellatus. At present, 44 nominal species of the genus have been reported from Japan, including four new species described in this paper; 38 of them have been described originally from Japan.
    No preview · Article · Feb 2013 · Folia parasitologica
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    ABSTRACT: Multiple paternity within the same clutch has been detected in all sea turtle species. However, no study to date has addressed the likelihood of sperm storage across years in any sea turtle species in the wild because of the logistical difficulties associated with investigating the same individual females across breeding seasons. Here we provide paternity data from captive loggerhead turtles (Caretta caretta) during 2–4 successive breeding seasons and behavioral information to estimate sperm storage duration in this species. Data from interseasonal comparisons for individual females showed that paternity was identical between two successive breeding seasons. However, females were observed to copulate with males, which were sire of their hatchlings of the previous breeding season, just prior to the nesting period of the next breeding season. Therefore, it is appropriate to regard the consistency in paternity across two successive breeding seasons as a result of re-mating with a sire from the previous season. Conversely, paternity was entirely different from that in the previous season if copulatory behavior occurred just prior to the next season with a male that was not a sire of the female's hatchlings from the previous season. Furthermore, a female that had laid fertile eggs in the previous breeding season but was not observed to successfully copulate with any male during the next breeding season laid no fertile eggs during that next season. Taking these data into consideration, it appears that sperm storage across breeding seasons did not occur in this study of captive Caretta.
    Full-text · Article · Jan 2013 · Journal of Experimental Marine Biology and Ecology
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    Ione Madinabeitia · Danny Tang · Kazuya Nagasawa
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    ABSTRACT: This study describes four new species of Colobomatus Hesse, 1873 and redescribes Colobomatus collettei Cressey, 19773. Cressey , RF. 1977. Two new species of Colobomatus (Copepoda: Cyclopoida) parasitic on Pacific fish. Proc Biol Soc Wash., 90: 579–583. [CSA]View all references and Colobomatus pupa Izawa, 197410. Izawa , K. 1974. On three new species of Colobomatus (Cyclopoida: Philichthyidae) parasitic on Japanese fishes. Publ Seto Mar Biol Lab., 21: 335–343. View all references based on females collected from the sensory canals of seven finfish species from off the Ryukyu Islands, southern Japan. Colobomatus pteroisi sp. nov. from Pterois volitans is unique in having a mid-lateral pair of cephalic processes; Colobomatus acanthuri sp. nov. from Acanthurus olivaceus possesses a short neck between the head and first pair of thoracic processes and tiny spinules and three claws apically on the cephalic, thoracic and genital processes; Colobomatus gymnocranii sp. nov. from Gymnocranius griseus has an anterior pair of papillose thoracic processes that are twice as long as the posterior pair of spinulose processes; Colobomatus absens sp. nov. from Pterocaesio digramma is unique in lacking a posterior pair of thoracic processes. New host and locality records for C. collettei and C. pupa are also reported herein. http://www.zoobank.org/urn:lsid:zoobank.org:pub:BEB140D5-8936-4B47-B8B9-738BFABF37E1
    Full-text · Article · Dec 2012 · Journal of Natural History
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    Ione Madinabeitia · Kazuya Nagasawa
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    ABSTRACT: An alternative approach for the recovery of parasitic copepods from finfishes is proposed herein by applying double-netting (DN) after visual scanning (VS). Double-netting consists of double-filtering the dislodged debris after washing and shaking all dissected parts visually scanned previously. During DN, two different sized hand-nets (≤200 μm in mesh size) are used simultaneously. The debris entangled in the first net is recovered by washing the first net in the second one. A total of 1448 copepods were recovered from nine sparid finfish species by applying DN, accounting for 25% of the total. The most abundantly recovered copepods were bomolochids and philichthyids. Our double-sieving method is efficient in recovering overlooked copepods by VS, providing more accurate results in diversity and quantitative studies. Additional advantages of DN include its simplicity (small size and weight), low price (less than US$ 3), and convenience (easy to transport and apply directly in the field).
    Full-text · Article · Dec 2012 · Journal of Natural History
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    ABSTRACT: The loggerhead turtle (Caretta caretta) is listed as an endangered species in the International Union for Conservation of Nature Red List, and this is critical for the maintenance of future genetic diversity. For the conservation of this species, it is important to understand the relationships between sexual selection and gene flow in the evolution of biodiversity. It is, however, virtually impossible to study sexual selection in such an oceanic species in the field. We investigated the relationships between mate preference and genetic relatedness of reproductively active loggerhead turtles (n = 7) kept in a tank at an aquarium using 4 different estimators of pairwise genetic relatedness (r) based on the genotypes at 23 microsatellite loci. Although relationships between total number of courtship behavior and r were not significant in the 4 estimators, there were significant and consistent inverse relationships between cumulative duration of mountings and r in all of the estimators. In addition, significant or marginally significant relationships were found between mean r for each female and number of sires in her successive clutches in 3 of the 4 estimators. However, we found no evidence that more distantly related pairs produced more offspring than the assumption of random mating except for 1 estimator or any relationship between r of parents and their reproductive success (hatchability). Based on these results, the most parsimonious explanation is that loggerhead turtles in the tank tend to prefer their mate(s) according to genetic relatedness but that the extent of female mate selection and the relationship between mate selection and fitness still remain debatable.
    Full-text · Article · Dec 2012 · Chelonian Conservation and Biology
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    Danny Tang · George W. Benz · Kazuya Nagasawa
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    ABSTRACT: This report provides the first description of the male of Prosaetes rhinodontis (Wright, 1876) (Copepoda, Siphonostomatoida, Cecropidae) based on specimens collected from two whale sharks (Rhincodon typus Smith) held in sea pens off the west coast of Okinawa-jima Island, Japan. We argue that the morphology of P. rhinodontis contributes significantly to the blurring of familial limits between Cecropidae Dana, 1849 and Pandaridae Milne Edwards, 1840 and based on our detailed consideration of this matter we recommend that Cecropidae be recognized as a junior synonym of Pandaridae. Accordingly, we transfer P. rhinodontis, along with species of Cecrops Leach, 1816, Luetkenia Claus, 1864, Philorthagoriscus Horst, 1897, Orthagoriscicola Poche, 1902, and Entepherus Bere, 1936, to the Pandaridae. In addition, our critical evaluation of the morphological features of the adult female and copepodid I of Amaterasia amanoiwatoi Izawa, 2008 indicated that the establishment of Amaterasidae Izawa, 2008 to hold the species was unfounded because A. amanoiwatoi can be accommodated within Pandaridae. Thus, we transfer A. amanoitwatoi to Pandaridae and consider Amaterasidae to be a junior synonym of Pandaridae. Lastly, our comparisons of morphological and ecological attributes of A. amanoiwatoi, specimens of “Nesippus costatus? Wilson, 1924” (Pandaridae) reported by Lewis in 1964, and other pandarids (Pandaridae) revealed the first two taxa to be strikingly similar and suggested them to be congeners. Based on those results we propose Lewis’ specimens represent a new species, which we name Amaterasia lewisi n. sp. Within the Pandaridae, Amaterasia spp. seem to belong to the Dinemoura-group based primarily on their similarity to some Nesippus spp., while representatives of Prosaetes, Cecrops, Luetkenia, Philorthagoriscus, Orthagoriscicola, and Entepherus are more confidently considered members of the Dinemoura-group based on their shared possession of a narrow third pedigerous somite and dorsal plates on the fourth pedigerous somite in the adult female and a modified leg 3 terminal endopodal segment in the adult male.
    Full-text · Article · Dec 2012
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    Daisuke Uyeno · Kazuya Nagasawa
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    ABSTRACT: Four new species of splanchnotrophid copepods are described based on specimens collected from 5 species of doridacean nudibranchs from coastal waters of Japan. They belong to 3 genera, one of which, Majimun gen. n., is new. The parasites and their hosts are as follows: Ceratosomicola japonica sp. n. ex Hypselodoris festiva (A. Adams); Splanchnotrophus helianthus sp. n. ex Thecacera pennigera (Montagu); Splanchnotrophus imagawai sp. n. ex Trapania miltabrancha Gosliner & Fahey; and Majimun shirakawai gen. et sp. n. ex Roboastra luteolineata (Baba) and Roboastra gracilis (Bergh). Ceratosomicola japonica sp. n. is the fifth species of Ceratosomicola and is characterized by the shape and armature of the prosome in females. Both Splanchnotrophus helianthus sp. n. and Splanchnotrophus imagawai sp. n. are differentiated from 4 known congeners by the absence of posterolateral processes or lobes on the prosome in females, and the females of these 2 new species are separated from each other by the shape and armature of the genito-abdomen, the mandible, and the swimming legs. Majimun gen. n. is distinguished from other splanchnotrophid genera by the segmentation of the antennule as well as the combination of the following characters in females: 2 postgenital somites and the shape of the antenna, the mandible and the swimming legs.
    Preview · Article · Nov 2012 · ZooKeys
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    Daisuke Uyeno · Kaori Wakabayashi · Kazuya Nagasawa
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    ABSTRACT: A new species of copepod, Sarcotretes umitakae sp. n., of the siphonostomatoid family Pennellidae is described based on female specimens from the rattail Coelorinchus jordani Smith and Pope (Actinopterygii: Gadiformes: Macrouridae) caught in the East China Sea. This species is characterized by exhibiting the following characters: the large proboscis projects strongly; the head bears paired lateral processes which are bulbous and taper into a slender horn; the twisting neck is significantly longer than the trunk; and the trunk bears an anterior constriction with a reduced abdomen.
    Full-text · Article · Nov 2012 · ZooKeys
  • Hirotaka Katahira · Kouki Mizuno · Tetsuya Umino · Kazuya Nagasawa
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    ABSTRACT: With technological improvements in otolith microchemical analysis, the flexible use of habitat from coastal marine to fresh waters has been discovered in Japanese eels Anguilla japonica. We examined the occurrence of 3 congeneric gill monogeneans-Pseudodactylogyrus anguillae, P. bini, and P. kamegaii-on wild Japanese eels, in relation to the host's flexibility. From April 2008 to October 2009, 114 eels were collected from a brackish-water cove and 2 rivers flowing into the cove in Ehime Prefecture, western Japan. Based on otolith microchemical analysis, the eels were discriminated according to the following 4 types of habitat use: freshwater residents (Type I), individuals utilizing low-salinity habitats (Type II), downstream habitat-shifters (Type III), and cove residents (Type IV). P. anguillae occurred mainly on Type I and II eels, while P. bini was primarily found on Type I eels. In contrast, P. kamegaii occurred mainly on Type III and IV eels. Thus, we conclude that species composition and infection levels of Pseudodactylogyrus spp. clearly differed with habitat-use patterns of Japanese eels. Also, since P. anguillae was scarcely found on either Type III or IV eels, this study suggests that previous identifications of monogeneans collected from European brackish-water localities as P. anguillae may require verification.
    No preview · Article · Aug 2012 · Diseases of Aquatic Organisms
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    ABSTRACT: The nematode Anguillicoloides crassus is one of the many threats hanging over anguillid eels, now known to infect six Anguilla species worldwide. It was first described in Japan, in 1974, and is commonly thought to natively stem from East Asia. Here our primary objective was to critically evaluate this long-held statement. We first retraced the factual history of this global invader, to later investigate the pros and cons for an East Asian origin. After exploring the alternative scenarios for the joint origin of the two anguillicolid parasites occurring in this area, we concluded that the geographic zone covering the natural range of the local eel A. japonica is still the most probable origin (in the absence of another identified candidate host and area). However, we cannot exclude that A. crassus may have been previously introduced along with exotic eel species, at some early stages of aquaculture in Japan. We call for caution when dealing with the native origin of this and other parasitic invaders in provenance of East Asia, a region to be regarded as a major crossroads for fish and parasites of the world. We finally identified the need for a possible resolution of the question, which includes a deeper sampling effort in the Indo-Pacific zone and the further development of molecular phylogeographic studies of all five anguillicolid species and their hosts.
    Full-text · Article · Aug 2012 · Aquatic Invasions
  • Daisuke Uyeno · Kazuya Nagasawa
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    ABSTRACT: Two new species of Hatschekia Poche, 1902 (Siphonostomatoida: Hatschekiidae) are described based on specimens collected during the KUMEJIMA 2009 Expedition carried out at Kumejima Island, Ryukyu Islands, an area getting strong Kuroshio current influence in the East China Sea, Japan. Female Hatscekia triannuli n. sp. and female and male H. sumireyakko n. sp. were removed from Centropyge heraldi Woods & Schultz and C. venusta (Yasuda & Tominaga), respectively. The two new species shares a unique dorsal frame on the cephalothorax that is absent on other congeners. These two species can be differentiated from each other by the shape and proportion of the cephalothorax, trunk, and leg 2.
    No preview · Article · Jul 2012 · Zootaxa
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    Takeo Yamauchi · Kazuya Nagasawa
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    ABSTRACT: Nerocila japonica Schioedte & Meinert, 1881 is redescribed based on the holotype and specimens from various localities in Japanese waters. The following fishes are recorded as new hosts: Tribolodon hakonensis (Cyprinidae), Mugil cephalus, Liza affinis, Chelon haematocheilus (Mugilidae), Lateolabrax japonicus, L. latus (Lateolabracidae), Acanthopagrus latus, A. schlegelii schlegelii (Sparidae), Rhyncopelates oxyrhynchus (Terapontidae), Ditrema viride, D. temminckii temminckii (Embiotocidae), Chaenogobius gulosus, Acanthogobius flavimanus (Gobiidae), Pseudolabrus sp. (Labridae) and Aluterus monoceros (Monacanthidae). Specimens previously recorded as 'Nerocila acuminata' from Toyama Bay (the Sea of Japan) were examined, when available, and re-identified as N. japonica. As there has been no reliable record of N. acuminata Schioedte & Meinert, 1881 from off Japan, reports of this species in Japanese waters are considered to represent N. japonica.
    Full-text · Article · Feb 2012 · Systematic Parasitology

Publication Stats

836 Citations
100.47 Total Impact Points

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  • 2006-2015
    • Hiroshima University
      • • Graduate School of Biosphere Sciences
      • • Department of Bioresource Science
      Hirosima, Hiroshima, Japan
  • 1998-2010
    • Academy of Sciences of the Czech Republic
      Praha, Praha, Czech Republic
  • 1993-2009
    • National Research Institute of Far Seas Fisheries
      Sizuoka, Shizuoka, Japan
  • 2007
    • Virginia Institute of Marine Science
      Gloucester Point, Virginia, United States
  • 2001-2005
    • Fisheries Research Agency
      Yokohama, Kanagawa, Japan
    • California State University, Long Beach
      • Department of Biological Sciences
      Long Beach, California, United States
  • 2004
    • Southeast Asian Fisheries Development Center (SEAFDEC)
      Iloilo Proper, Western Visayas, Philippines
  • 2000
    • London Natural History Society
      Londinium, England, United Kingdom