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Crustacean Research 49 BODY LENGTH VARIATION in CYMOTHOID

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Crustacean Research 49 BODY LENGTH VARIATION in CYMOTHOID Crustacean Research 2020 Vol.49: 57–60 ©Carcinological Society of Japan. doi: 10.18353/crustacea.49.0_57 Body length variation in the marine fish ectoparasite Ceratothoa oxyrrhynchaena (Isopoda: Cymothoidae) in relation to host body size Kazuya Nagasawa Abstract.― The cymothoid isopod Ceratothoa oxyrrhynchaena Koelbel, 1879 was collected from the buccal cavity of yellowback sea-bream, Dentex hypselosomus Bleeker, 1854, in the southern Sea of Japan. There was a linear positive relationship between isopod body length (female, 22.6–35.0 mm; male, 9.6–17.0 mm) and fish standard length (115–249 mm). Body lengths of paired female and male isopods were also correlated with each other. These results indicate that isopods parasitized smaller fish than those examined and grew steadily as their hosts grew. This paper also sug- gests that the isopod can stay over three years in the buccal cavity of fish. Key words: isopod, cymothoid, buccal cavity, growth, yellowback sea-bream, Dentex hypselosomus The cymothoid isopod Ceratothoa portant to understand how cymothoids can oxyrrhynchaena Koelbel, 1879 is a buccal par- grow and reproduce in a female-male pair in asite of marine fishes in the Northern and such a space-limited habitat. Recently, we ex- Southern Hemispheres, including the western amined as many as 289 individuals of yellow- Pacific (Japan, Australia), the Red Sea (Gulf of back sea-bream, Dentex hypselosomus Bleeker, Suez), the Mediterranean Sea (Italy, France, 1854 (Perciformes: Sparidae), for determining Tunisia, Algeria, Croatia), and the eastern body length variation in C. oxyrrhynchaena in North Atlantic (Mauritania) (see Horton, 2000; relation to host body size. The fish species has Yamauchi, 2009; Martin et al., 2013, 2015 for been reported as one of the hosts serving for C. the literature). The species was originally de- oxyrrhynchaena in Japanese waters (Hata et al., scribed from Japan (Koelbel, 1879). Our 2017; Yamauchi & Kashio, 2018; Nagasawa, knowledge of the biology of C. oxyrrhynchaena 2020). is quite limited because previous works have The yellowback sea-bream examined were focused on its taxonomy using a few speci- caught on 24–25 April 2011 in bottom trawls at mens taken from infected fishes or loaned from depths of 110–120 m in the southern Sea of Ja- museums. For better understanding of the oc- pan (34°–35°N, 129°–130°E) off the Tsushima currence and biology of the species, it is neces- Islands, Nagasaki Prefecture, and immediately sary to quantitatively examine many individu- deeply frozen on board. These fish were sent to als of hosts from various locations and to study the laboratory of Hiroshima University, Hi- isopod specimens of various body sizes. gashi-Hiroshima, Hiroshima Prefecture, where The growth of cymothoids parasitic in the they were thawed, measured for standard fish buccal or branchial cavity is known to be length (SL, mm), and examined for the occur- related to the body size or age of hosts (e.g., rence of C. oxyrrhynchaena in the buccal cavi- Maxwell, 1982; Colorni et al., 1997; Parker & ty. Fish identification was confirmed based on Booth, 2013; Pawluk et al., 2015; Vignesh- Iwatsuki et al. (2007). Isopods were removed, waran et al., 2019; Kottarathil et al., 2019; counted, and fixed in 70% ethanol. Later, at the Welicky et al., 2019). This information is im- Aquaparasitology Laboratory, Kusanagi, Received: 28 Jan 2020. Accepted: 19 Apr 2020. Published online: 21 May 2020. 57 KAZUYA NAGASAWA Shizuoka Prefecture, individual isopods were females (as a single individual) from five fish; measured (to the nearest 0.1 mm) for body and four males (as a single individual) from length (BL, from the anterior end of the cepha- four fish. Females were larger (22.6–35.0 [29.0] lon to the posterior extremity of the pleotelson) mm BL, n＝31) than males (9.6–17.0 [13.6] and sexed. As statistical analyses, normality of mm BL, n＝30), and females were all oviger- the data of host SL and isopod BL was first ex- ous. Infection by a single isopod (female or amined using the Shapiro-Wilks test, and these male) on the nine fish is probably due to dis- data were found not to be normally distributed. lodgement of isopods from the buccal cavity Thus, the association between host SL and iso- during and after trawl fishing (see Robinson, pod BL and between isopod female and male 1982). BLs was determined using the Spearman’s rank There was a positive linear relationship be- correlation coefficient. The statistical software tween female isopod BL and fish SL (r＝0.608, R was used for all these analyses. Voucher P＝0.0002) and between male isopod BL and specimens of C. oxyrrhynchaena (five oviger- fish SL (r＝0.719, P＜0.0001) (Fig. 1). Paired ous females and five adult males preserved in female and male isopod BLs were weakly but 70% ethanol) have been deposited in the Crus- positively correlated with each other (r＝0.422, tacea (Cr) collection of the National Museum P＜0.05) (Fig. 2). These results indicate that of Nature and Science, Tsukuba, Ibaraki Pre- individuals of C. oxyrrhynchaena parasitized fecture, Japan (NSMT-Cr 27416). smaller fish than those examined and grew In total, 61 individuals of C. oxyrrhynchaena steadily together with their hosts. Similar sug- were collected from 35 (12.1%) of the 289 yel- gestions have been proposed for some other lowback sea-bream examined (115–249 [mean, cymothoid species occurring in the buccal or 151] mm SL, n＝289): 52 individuals (26 fe- branchial cavity, based on a linear relationship males and 26 males in pairs) from 26 fish; five between body size of cymothoid isopod and its fish host (see the second paragraph for the lit- erature). The smallest infected fish found in this study was 123 mm SL, and this individual corre- sponds to an age 1–1.5 fish, based on a rela- tionship between fork length and age of yel- lowback sea-bream (as Dentex tumifrons, see Fig. 1. Relationship between standard length of yellowback Fig. 2. Relationship between body lengths of female and sea-bream (Dentex hypselosomus) and body length of female male Ceratothoa oxyrrhynchaena. (top) and male (bottom) Ceratothoa oxyrrhynchaena. 58 Crustacean Research 49 BODY LENGTH VARIATION IN CYMOTHOID Iwatsuki et al., 2007, for synonymy) from the Marine Biology, 164: 105. DOI 10.1007/ neighboring East China Sea (Oki & Tabeta, s00227-017-3138-5. 1998). The largest female isopod (34.5 mm Horton, T., 2000. Ceratothoa steindachneri BL) was collected from a fish of 220 mm SL, (Isopoda: Cymothoidae) new to British wa- whose age is estimated to be 4–4.5 years old. It ters with a key to north-east Atlantic and is thus reasonable to suppose that at least age Mediterranean Ceratothoa. Journal of the 1–4.5 fish are infected by C. oxyrrhynchaena Marine Biological Association of the United in the surveyed region. Because individuals of Kingdom, 80: 1041–1052. the isopod are suggested herein to grow with Iwatsuki, Y., Akazaki, M., & Taniguchi, N., 2007. their host (Fig. 1), they are likely capable of Review of the species of the genus Dentex (Perciformes: Sparidae) in the Western Pa- staying over three years for growth and repro- cific defined as the D. hypselosomus com- duction in the buccal cavity of the fish. A simi- plex with the description of a new species, lar, three- to four-year life span has been sug- Dentex abei and a redescription of Evynnis gested for Cymothoa borbonica Schioedte & tumifrons. Bulletin of the National Museum Meinert, 1884, a cymothoid found in the buccal of Nature and Science, Tokyo, Series A, cavity of largespot pompano, Trachinotus bolta Supplement, 1: 29–49. (Shaw, 1803) (Perciformes: Carangidae), in Koelbel, C., 1879. Über einige neue Cymothoiden. South African waters (Parker & Booth, 2013). Sitzungsberichte der Mathematisch- For determining the exact life period of C. Naturwissenschaftlichen Klasse der Kaiserli- oxyrrhynchaena, it is desirable to conduct an chen Akademie der Wissenschaften, 78: 401– experimental infection of yellowback sea- 416. bream by juvenile isopods and to monitor their Kottarathil, H. A., Sahadevan, A. V., Kattamballi, growth on such fish held in tanks for years. R., & Kappalli, S., 2019. Norileca indica I thank the staff of the Shimonoseki Marine (Crustacea: Isopoda, Cymothoidae) infects Science Museum, Shimonoseki, for their assis- Rastrelliger kanagurta along the Malabar tance and cooperation to obtain the fish sample Coast of India̶seasonal variation in the examined in this study. I am also grateful to an prevalence and aspects of host-parasite anonymous reviewer for constructive com- interactions. Zoological Studies, 58: 35. ments to improve the manuscript. doi:10.6620/ZS.2019.58-35. Martin, M. B., Bruce, N. L., & Nowak, B. F., ■ Literature Cited 2013. Redescription of Ceratothoa carinata (Bianconi, 1869) and Ceratothoa oxyr- Colorni, A., Trilles, J.-P., & Golani, D., 1997. rhynchaena Koelbel, 1878 (Crustacea: Isop- Livoneca sp. (Flabellifera: Cymothoidae), an oda: Cymothoidae), buccal-attaching fish isopod parasite in the oral and branchial parasites new to Australia. Zootaxa, 3683: cavities of the Red Sea silverside Atherino- 395–410. morus lacunosus (Perciformes, Atherinidae). Martin, M. B., Bruce, N. L., & Nowak, B. F., Diseases of Aquatic Organisms, 31: 65–71. 2015. Review of the fish-parasitic genus Hata, H., Sogabe, A., Tada, S., Nishimoto, R., Ceratothoa Dana, 1852 (Crustacea: Isopoda: Nakano, R., Kohya, N., Takeshima, H., & Cymothoidae) from Australia, with descrip- Kawanishi, R., 2017. Molecular phylogeny tion of two new species. Zootaxa, 3963: of obligate fish parasites of the family Cy- 251–294. mothoidae (Isopoda, Crustacea): evolution Maxwell, J. G. H., 1982. Infestation of the jack of the attachment mode to host fish and the mackerel, Trachurus declivis (Jenyns), with habitat shift from saline water to freshwater.
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