著者

出羽 優凪 寺井 俊二 本村 浩之

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.21-020, (Released:2021-09-17)

参考文献数

15

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The triplefin genus Ceratobregma Holleman, 1987 includes two valid species, the Spotted Spiny-eye Triplefin C. acanthops (Whitley, 1964) and Helen’s Triplefin C. helenae Holleman, 1987. Both are characterized by the first dorsal fin having 3 spines, the anal fin 2 spines, and the pelvic fin with one spine and 2 rays, in addition to discontinuous lateral lines (upper series of tubular pored scales and lower series of notched scales), well developed lateral ethmoids, 3 or 4 spines on the anterior margin of the orbit in males, and a scaleless opercle and pectoral-fin base. Ceratobregma acanthops is known only from the Coral Sea, whereas C. helenae is widely distributed in the eastern Indian and western Pacific oceans. A single specimen (KAUM–I. 146836, 24.3 mm standard length) of C. helenae collected from Kume-jima Island, Okinawa Islands, Ryukyu Archipelago, Japan in October 2020 possessed the following characters: first spine of 1st dorsal-fin shorter than that of 2nd dorsal-fin; caudal peduncle narrow; sides of body with orange vertical bands; and 2nd dorsal fin with a basal series of orange spots. Previous records of the species from Japan include a single specimen (BPBM 8723, 29.6 mm standard length) collected from Taketomi-jima Island, Yaeyama Islands in 1968, and underwater photographs (as Ceratobregma sp.) taken at Irabu-jima and Miyako-jima Islands, Miyako Islands, in 2002 and 2004, respectively. The two Japanese specimens were examined, that from Kume-jima Island (described in detail) representing the northenmost record for the species. The new standard Japanese name “Mikan-hebigimpo” is proposed for C. helenae on the basis of the Kume-jima specimen, “Mikan-hebigimpo-zoku” serving for the genus Ceratobregma.

著者

永江 栞奈 高橋 弘明 遠藤 広光

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.21-007, (Released:2021-07-30)

参考文献数

23

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Mating behavior and early development of Cobitis sp. (BIWAE type D, TosaShima-dojo) were observed in the laboratory by inducing spawning of females with human chorionic gonadotropin (HCG). Subsequently, laboratory bred individuals were compared with spawned eggs and larvae obtained from the field. Mature adults, naturally spawned eggs, and larvae were collected from a river in eastern Kochi Prefecture, Shikoku Island, Japan, and a natural spawning ground adjacent to the river. Mating behavior was observed 15 times at night, and distinguished into four stages: phase 1, tracking; phase 2, approaching; phase 3, amplexus; and phase 4, spawning. Egg diameters after water absorption were 2.1–2.3 mm, the spherical, demersal eggs having a light-yellow yolk, no oil droplets, and slight viscosity. Newly hatched larvae [3.3–4.9 mm in total length (TL)] had 46 (32 + 14) myomeres, two pairs of outer gill filaments on the cheek, and melanophores on the head. Notochord flexion started at 6.0–7.2 mm TL (wild individuals at 6.0–6.3 mm TL) and was completed at 8.8 mm TL (6.6 mm TL). The formation of membranous fins and full fin-ray complements were attained in the fin order pectoral, caudal, dorsal, anal, and pelvic, and caudal, dorsal, anal, pectoral, and pelvic, respectively. Some individuals (7.0–8.0 mm TL at the flexion stage) had free neuromasts, each with a short cupula, laterally on the caudal region. In addition, following the postflexion stage, some morphological differences between artificially bred and wild individuals were observed but could not be quantified due to the small sample size.

著者

村﨑 謙太 甲斐 嘉晃 遠藤 広光 福井 篤

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.20-044, (Released:2021-05-10)

参考文献数

23

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Snailfishes (Cottoidei: Liparidae) are a large, morphologically diverse group of marine fishes, comprising about 32 genera with over 430 species worldwide. Among them, Osteodiscus Stein, 1978 is primarily distinguished from other genera in having a unique skeletal pelvic disk covered only by thin skin. Three species of the genus are currently known: Osteodiscus cascadiae Stein, 1978 from the eastern North Pacific; Osteodiscus andriashevi Pitruk and Fedorov, 1990 from southern Sea of Okhotsk; and Osteodiscus rhepostomias Stein, 2012 from southeast of New Zealand. During a taxonomic study of snailfishes, a single female specimen of Osteodiscus (150.3 mm in standard length) collected off Iwate in a depth of 1,997–2,108 m, was discovered in the fish collection of the National Museum of Nature and Science, Japan (NSMT). The specimen, characterized by 60 vertebrae (total), 54 dorsal- and 49 anal-fin rays, a horizontal mouth, simple blunt teeth on both jaws, some teeth with lateral cusps on the tip, an unnotched pectoral fin, and the presence of epipleural ribs and a reduced epural, was identified as O. andriashevi, previously known only from the holotype and three paratypes. The present specimen represents the first record of Osteodiscus from Japanese waters and the southernmost record of O. andriashevi. The new standard Japanese names “Hariban-kusauo-zoku” and “Choja-hariban-kusauo” are proposed for the genus and species, respectively. Based on the present specimen, the species diagnosis was partly revised.

著者

中野 寛 小針 統 山口 敦子 久米 元

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.20-030, (Released:2020-10-02)

参考文献数

28

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The diet of the critically endangered Ryukyu-ayu Plecoglossus altivelis ryukyuensis in the middle reaches of the Kawauchi, Sumiyo, and Yakugachi Rivers, Amami-oshima Island, southern Japan was examined by gut content analysis and inferred from stable isotope signatures. No clear differences in diet composition were apparent among the rivers. Microalgae, such as diatoms and cyanobacteria, generally considered as important food, were only rarely observed in gut contents, whereas detritus was almost exclusively found. However, stable isotope signatures indicated that detritus was not directly utilized as a nutritional source, indicating that food availability was an issue for P. a.ryukyuensis.

著者

川路 由人 瀬能 宏 武藤 望生 本村 浩之

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.66, no.2, pp.137-154, 2019

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<p>A comparison of 68 specimens of <i>Plectranthias</i> (Serranidae: Anthiadinae) from Japanese waters with 85 Indo-Pacific specimens, all characterized by the fourth dorsal-fin spine longest, no branched pectoral-fin rays, two antrorse spines on the lower preopercular margin, the lateral line incomplete with fewer than 22 pored scales, and scales absent from the maxilla, revealed the former to include <i>P. longimanus</i> (Weber, 1913) [23 specimens, 8.5–28.4 mm standard length (SL)], <i>P. nanus</i> Randall, 1980 (38, 10.6–32.3 mm SL), and <i>P. winniensis</i> (Tyler, 1966) (7, 24.1–38.6 mm SL). Among the Japanese specimens, <i>P. longimanus</i> was similar to <i>P. nanus</i> in overall body appearance, but differed from the latter in having modally 12 pectoral-fin rays [vs. 13 in <i>P. nanus</i>], 15 gill rakers (vs. 17), 14 pored lateral-line scales (vs. 18), 26 or 27 scale rows in the longitudinal series (vs. 28), 8 scale rows below the lateral line (vs. 9), 3 interopercular spines (vs. spines absent), and 2 or 3 subopercular spines (vs. spines absent), a maximum body depth 34.1% (mean) of SL (vs. 28.6%), and a vertical band absent near the base of the caudal fin (vs. band present in both fresh and preserved specimens). Japanese <i>P. winniensis</i> clearly differed from the other two species, having 16 or 17 soft rays in both the dorsal and pectoral fins (vs. fewer than 15 rays in the latter two species), modally 16 pored lateral-line scales (vs. 14 in <i>P. longimanus</i>, 18 in <i>P. nanus</i>), subopercular spine absent (vs. 1–4 present in <i>P. longimanus</i>), and a greenishred body without dark blotches or bands (vs. reddish-brown body, mottled with dark blotches and bands). In addition, analyses of 12S ribosomal RNA and cytochrome c oxidase subunit I gene sequences indicated that the three species were genetically distinct from each other. In Japanese waters, <i>P. longimanus</i> has been recorded from the Izu Peninsula and the Izu Islands to the Koshiki Islands, mainland Kagoshima, and the Ryukyu Islands, <i>P. winniensis</i> having a similar distribution pattern, i.e., from the Izu Islands south to the Ryukyu Islands. <i>Plectranthias nanus</i> has been recorded only from island groups, including the Ogasawara, Ryukyu, and Daito islands.</p>

著者

松沼 瑞樹 山川 武 星野 和夫

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.19-003, (Released:2019-07-24)

参考文献数

18

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Previous Japanese records of Chelidoperca margaritifera Weber, 1913 (Perciformes: Serranidae) were reviewed, and all available Japanese specimens previously reported as that species found to be either C. santosi Williams and Carpenter, 2015 or C. tosaensis Matsunuma, Yamakawa and Williams, 2017. No evidence was found of C. margaritifera occurring in Japanese waters, the species instead being known solely from the holotype, collected off New Guinea. Chelidoperca santosi is characterized by three scale rows between the lateral line and middle of the spinous dorsal-fin base; two pairs of dark spots on the snout; a pair of dark spots on the lower jaw tip; the interorbital scales just reaching or extending slightly beyond mid-orbit but not reaching level with the posterior nasal pores; scales on the mandibular ventral surface extending anteriorly onto the dentary; and enlarged canine-like teeth on both jaws, thereby being distinguished from all Japanese congeners [C. hirundinacea (Valenciennes in Cuvier and Valenciennes, 1831), C. pleurospilus (Günther, 1880) and C. tosaensis]. The standard Japanese name “Minamihimekodai” should be applied to C. santosi.

著者

山根 英征 横山 正 長田 芳和 山田 卓三

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.51, no.2, pp.135-147, 2004-11-25 (Released:2010-06-28)

参考文献数

18

被引用文献数

5

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The reproductive ecology and early life history of the bagrid catfish, Pseudobagrus nudiceps, were investigated in the field and laboratory. The species reproduced between late June and early August in a tributary of the Kinokawa River, Wakayama Prefecture. During the reproductive period, large mature males maintained a territory around crevices along shoals and banks. Mating behavior was observed there and in an aquarium, the field observations being the first for any Asian bagrid. When a female visited a male's territory, a series of behavioral activities, including courting, embrace and egg-stirring by the female were observed. Females (115-137mm SL) produced 1200-3000 developed ovarian eggs, apparently spawning in the nests of several males. Parental males cared for the eggs by fanning and cleaning, using the pectoral and pelvic fins, and displayed aggressive behavior against fish approaching the nest. Spawned eggs were adhesive and between 2.5-2.7mm in diameter. The eggs hatched 2.5-3 days after fertilization at an average water temperature of 26°C. At 2 days posthatching, the larvae began to move at night, leaving the nest after 7 days. Brood parasitism by the Japanese minnow, Pungtungia herzi, was frequently observed in the nests of Pseudobagrus nudiceps.

著者

綱川 孝俊 白井 厚太朗

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.18-009, (Released:2018-06-30)

参考文献数

62

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The migratory histories of individual masu salmon Oncorhynchus masou collected from the Naka River, Tochigi, Japan were clarified from otolith strontium (Sr) and calcium (Ca) concentrations using X‒ray electron microprobe analysis. Mapping and line analysis indicated three migratory types of the species. In addition to the conventional types, such as freshwater resident and typical anadromous (spending one year in marine waters), a new migratory pattern of short marine term anadromous (remaining in marine waters for several months) was apparent. Detailed life histories of short marine term anadromous individuals were estimated from otolith Sr fluctuations and ageing, from both scale and otolith daily increments. Consequently, more than half of the Naka River population was estimated to migrate to a marine environment upon reaching a total length of 178‒252 mm (one year old) in December‒January, thereafter staying in marine waters for approximately five months, before returning to the river in May‒July at 345‒463 mm total length. These findings may help establish an enhancement method for this species as a recreational fishery stock. Future investigations, including tagging, verification of age evaluation methods, and gene analysis are necessary to confirm the existence of the short marine term anadromous form.

著者

河野 博

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.31, no.3, pp.268-286, 1984-11-20 (Released:2010-06-28)

参考文献数

50

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ウロコマグロの骨格系を記載した. それに基づいて, スズキ目に属する9科との比較を行い, ウロコマグロの系統的位置を考察した.ウロコマグロはサバ科魚類の特徴とみなされた13形質のうち12形質を保有していた.これに対して, サバ科以外のスズキ目魚類では, ウロコマグロとだけ共有されている形質はシイラ科の節骨以外に見出すことはできなかった.さらに, ウロコマグロには15の特異な形質が認められた.これらの形質は主に頭部に集中しており, これらの形質に基づいて単一の科を提唱することは本質的ではないと判断した. 以上のことから, ウロコマグロはサバ科に属すると結論した.ウロコマグロと他のサバ科魚類を比較すると, ウロゴマグロにはサバ科の原始的・派生的形質がモザイク状に分布していることが判明した. 先に述べた15の特異形質とサバ科魚類の形質状態がモザイク状に分布していることから, ウロコマグロは早い時期にサバ科の主幹から分化して独自の特化方向へむかったものと推論した.

著者

櫻井 真 広瀬 純 四宮 明彦

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.50, no.2, pp.165-168, 2003-11-25 (Released:2011-07-04)

参考文献数

8

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Abstract We conducted underwater observations on courtship and spawning be-haviors of the tetrarogidid fish, Hypodytes rubripinnis in Kyushu Island, Japan. The reproductive behavior and seasonal changes of gonad somatic index on col-lected specimens showed that spawning occurred from late April to early August. Individuals of various sizes in both sexes reproduced in the study area. About 90 min before sunset, a male courted a female actively with several patterns of be-haviors such as male's lying by a female in a side-by-side position, display of his lateral side around a female, and male's riding on a female back. Finally, the pair swam toward 20 to 100 cm above the bottom to release gametes. Spawning time was around sunset. The average egg number in each spawning was about 1600. Upward rush of the pair to the middle water occurred very quickly. Frequent sneaking behavior by another male was also observed.

著者

仲谷 一宏 中野 秀樹

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.42, no.3-4, pp.325-328, 1995-11-25 (Released:2010-06-28)

参考文献数

9

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南大西洋で漁獲されたツノザメ目ツノザメ科のオジロザメScymnodalatias albicauda の1尾の妊娠個体から発生中の59個体の胎仔を見いだした.胎仔の性別はオス33個体, メス26個体で, オス: メスの性比は1: 0.79, 大きさは全長157mmから192mmであった.本個体はマグロ延縄で漁獲されたが, 捕獲時の記録によると, いくつかの胎仔が総排出腔より海中に落ちたという.したがって, 60個体以上の胎仔をもっていたと推測される.サメ類の1腹の胎仔数は種類や個体の大きさにより様々であるが, ツノザメ類で知られている1腹の胎仔数は36個体までで, 大部分は20個体以下である.本研究ではオジロザメから1腹59個体の胎仔を見いだしたが, これは今までのツノザメ類の記録をはるかに上回る数で, ツノザメ類では最多, サメ類全体からみてもヨシキリザメ (135個体), カグラザメ (108個体) に次ぐ3番目の胎仔数である.なお, 各胎仔は大きな外卵黄嚢をもち, 腹腔内の3分の2の長さにおよぶ内卵黄嚢が形成されていた.内卵黄嚢は腸の始部 (十二指腸部) に直接開口し, 腸内にも卵黄物質が見られた.生殖方法は卵胎生 (卵黄物質にのみ依存する非胎盤性の胎生) であると考えられる.

著者

清水 長 山川 武

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.26, no.2, pp.109-147, 1979-09-15 (Released:2010-06-28)

参考文献数

115

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今日までに目本から知られているすべての種, 西太平洋産の2種, さらに日本産の1新種を含むイットウダイ亜科2属18種の分類学的研究を行い, 各種のシノニムを詳細に論じた.この亜科には, イットウダイ属Adioryxとウケグチイットウダイ属Flammeoの2属が知られ, 両者は背鰭第11棘の位置で区別される。この棘は, イットウダイ属では第10棘と背鰭第1軟条との中間に位置し, ウケグチイットウダイ属では背鰭第1軟条に極めて近く位置する。イットウダイ属の分類には計数的形質のほかに, 鼻骨後部の棘, 鼻孔の棘および第1眼下骨上縁の棘もしくは鋸歯の有無が有効な形質である.本属の日本産10種, ハナエビスA.furcatus, トガリエビスA.spinifer, クラカケエビス (新称) A.caudinaculatus, スミツキカノコA.cornutus, イットウダイA.spinosissimus, アヤメェビスA.ruber, ホシエビスA.lacteoguttatus, アオスジエビスA.tiere, ニジエビスA.diadena, テリエビスA.itiodaiおよび1新種バラエビスA.dorsomaculatusの記載が与えられた.この新種は鼻孔の後縁 (時には前縁にも) に小棘をもつ, 第1眼下骨上縁に鋸歯をもっ, 鼻骨後部は平滑で棘をもたない, 側線鱗数32-35, 体色は全体に赤色で背鰭第1棘から第3棘の問の鰭膜の下方部に黒斑をもつなどの特徴により他のいずれの既知の種とも区別される.日本以外からのスミレエビス (新称) A.violaceus, ヒメエビスA.microstomus, サクラエビス (新称) A.tiereoidesの3種を含めて, 西太平洋産イットウダイ属14種の実用的検索が作製された.ウケグチイットウダイ属4種は, 背鰭第11棘の長さ, 側線上方鱗数, 胸・臀鰭条数および背鰭棘部鰭膜上の黒色斑紋の有無と形により容易に識別される.これら4種の記載と検索が与えられた.

著者

松本 瑠偉 内田 詮三 戸田 実 仲谷 一宏

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.53, no.2, pp.181-187, 2006-11-25 (Released:2010-06-28)

参考文献数

18

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The bull shark, Carcharhinus leucas (Müller and Henle, 1839), previously reported from Japanese waters but without voucher specimens, is herein reported and its status as a Japanese species confirmed, from 33 specimens, including three from a riverine habitat, collected from Okinawa and Iriomote Islands, Okinawa Prefecture, Japan.

著者

藤岡 康弘

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.60, no.1, pp.57-63, 2013-04-25 (Released:2015-05-05)

参考文献数

46

被引用文献数

8

著者

明仁親王 目黒 勝介

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.22, no.2, pp.63-67, 1975-12-15 (Released:2010-06-28)

参考文献数

8

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ゴマハゼPandaka lidwilliに類似する小型のハゼの新種Pandaka trimaculataを記載し, ミツボシゴマハゼの和名を附した.本種は沖縄県石垣島と西表島およびフィリピンのミンダナオ島で採集された.ミツボシゴマハゼとゴマハゼの相違は縦列鱗数と腹部の斑紋にある.ゴマハゼの属名として用いられたBerowraはPandaka属との類似のため, Pandaka属のシノニムとした.

著者

多部田 修

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.17, no.2, pp.80-81, 1970-07-15 (Released:2010-06-28)

参考文献数

6

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ペルーの沖合で採集された大型のレプトセファルス幼生にっいて, 予報的にその形態と採集の記録を報告した.この幼生は全長74.7cmで, 糸状の尾部をもち, 腹鰭と発達した背鰭がなく, Leptocephalus giganteus Castle, 1959によく似ているが, 色素配列が異なる.この種はSmith (1970) によればNotacanthiformのものと考えられている.また, 今回の標本にはL.giganteusには記載のない肉質小突起が体側下縁に認められる.採集地は8°22'S: 79°56'W (水深218m) で, トロールネットによって, かなり上層と思われるところから採集された.

著者

木村 克也 津田 裕一 中山 直英

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.22-019, (Released:2022-11-14)

参考文献数

26

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The stomiid snaggletooth genus Astronesthes Richardson, 1845, including 49 valid species distributed in tropical to temperate waters of all oceans, is characterized by the following combination of characters: anal fin with 11–22 rays; maxillary teeth comblike, closely spaced, and slanting rearward; and photophores in the ventral series arranged in regular intervals. To date, 13 species of the genus have been reported from Japanese waters. A single specimen of Astronesthes (111.9 mm in standard length) was collected in December 2020, during a mid-water trawl survey conducted by R/V Shunyo-Maru in the vicinity of the Ogasawara Islands, Japan. Subsequently identified as Astronesthes gemmifer Goode and Bean, 1896, the specimen clearly differed from all congeners in having the following combination of characters: four premaxillary fangs in the main row (vs. 5–6); the posteroventral part of the terminal bulb of the chin barbel black (vs. usually not black or terminal bulb absent); and the last six VAV (photophores from the inner-pelvic space to the end of the row posterior to the anal-fin origin) located above the anal fin (vs. 1–4). Although A. gemmifer has been often recorded from the North Atlantic, records from the South Atlantic, Indian, and Pacific oceans are sparse. In the Pacific Ocean, the species has been recorded in Hawaiian waters from O‘ahu to the Hancock Seamounts, but not previously reported from Japanese waters, the present specimen representing the first Japanese record of A. gemmifer. The new standard Japanese name “Sumitsuki-tokagehadaka” is proposed for the species.

著者

禮宮文仁

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.36, no.1, pp.113-119, 1989-06-28 (Released:2011-02-23)

参考文献数

10

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パンガシウス科メコンオオナマズPongasianodon gtgasは, 両顎と口蓋の歯及び下顎のひげを欠き, 眼が低位にあることによりパンガシウス属Pangasiusより分けられていた.しかし, メコンオオナマズの稚魚では, 顎歯, 口蓋歯と下顎のひげはよく発達し, 眼も高位にあることが確認された.さらに尾骨の形質では, ある種のPangosusは同属の他種よりも, むしろメコンオオナマズと共通していた.これらの形態的共通性は, Pangasi-onodonがPangasiusと極めて近縁であることを示している.

著者

内藤 大河 山川 武 遠藤 広光

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.64, no.2, pp.139-143, 2017-11-25 (Released:2018-06-19)

参考文献数

12

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A single specimen [226 mm in standard length (SL)] of a haemulid fish collected from Iriomote-jima Island, Okinawa Prefecture, Japan, in 2012, was identified as Diagramma melanacrum Johnson and Randall, 2001, characterized by the following combination of characters: third dorsal-fin spine longest; first dorsal-fin spine length 45 % of second dorsal-fin spine length; pelvic-fin length 23.9 % SL; 57 lateral-line scales; and dorsal 3/4 of caudal fin yellow with many dark spots, and pelvic, anal and remainder of caudal fin black when fresh. The species has been recorded previously from the Philippines, Malaysia, Indonesia (Kalimantan and Bali to West Papua), the Timor Sea and Japan (Miyako-jima and Ishigaki-jima Islands, Okinawa). However, because both Japanese records were based on photographs, the Iriomote-jima Island specimen represents the first reliable, specimen-based record of D. melanacrum from Japan, an extension of its known northernmost range. The new standard Japanese name “Hireguro-korodai” is proposed for the species.

著者

佐藤 真央 長嶋 祐成 日比野 友亮

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.21-039, (Released:2022-04-28)

参考文献数

30

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A specimen (39.1 mm standard length) of the genus Ostorhinchus Lacepède, 1802, collected from Ishigaki-jima Island, the Ryukyu Archipelago, southern Japan, was identified as Ostorhinchus hartzfeldii (Bleeker, 1852). The specimen showed characteristic coloration of the species, including the following features: four slightly wavy longitudinal silver lines on the head and body, the dorsalmost running along the dorsal body margin to the caudal fin base, and the others terminating on the trunk or caudal peduncle; the entire body base color brown; all fins slightly reddish, transparent; a dark spot on the caudal fin base, of similar size to the pupil. Ostorhinchus hartzfeldii is similar to Ostorhinchus cookii (Macleay, 1881), Ostorhinchus nigrofasciatus (Lachner, 1953), and Ostorhinchus taeniophorus (Regan, 1908), but differs from them by having only the dorsalmost longitudinal silver line reaching the caudal fin base (vs. three or four lines reaching the fin base in the other three species) and absence of a longitudinal silver line on the ventrolateral aspect of the trunk (vs. present). Ostorhinchus hartzfeldii is distributed in the western Pacific, from the South China Sea to Australia, but had not previously been recorded from Japanese waters. A photographic record of the species from Ishigaki-jima Island is also included. The new standard Japanese name “Sazanami-ishimochi” is proposed, a reference to the slightly wavy silver lines that disappear with growth, based on the specimen collected from Ishigaki-jima Island.