Keita Koeda

Keita Koeda
University of the Ryukyus · Faculty of Science

Ph. D

About

78
Publications
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Introduction
Keita Koeda currently works at Kuroshio Biological Research Foundation. Keita does research in systematics (Taxonomy), biology and ecology on marine fish.
Skills and Expertise

Publications

Publications (78)
Article
To clarify the life cycles of two species of genus Pempheris around Okinawa-jima Island, age and growth were examined using sectioned otolith. Monthly changes in the appearance frequency of an opaque ring on the outer margin of the sagittal otolith indicated that ring formation occurred once a year from April to June in both species. Ages were dete...
Article
Pempheris familia sp. nov. is described on the basis of two specimens collected from the Ogasawara Islands, Japan. The new species is most similar to Pempheris japonica Döderlein in Steindachner and Döderlein 1883, endemic to Japanese and Korean waters, in having adherent scales with strong ctenii on the lateral and ventral surfaces of the body, ea...
Book
An annotated checklist of fishes of Yonaguni-jima island, Okinawa Prefecture, southern Japan, was compiled mainly from a field survey which was carried out at September 2015 by the authors belonging to five universities, as well as from results from two previous small-scale surveys. Additionally, all registered specimens previously recorded from Yo...
Article
Full-text available
Background Although the biomass of the nocturnal fishes is almost same as that of diurnal fishes, most of the ecological studies that examine feeding or reproductive behaviors are on diurnal fishes. Therefore, there is limited ecological information regarding the nocturnal fishes. This fact may be attributed to the difficulty in observing them duri...
Article
Rhynchobatus mononoke sp. nov. (Rhinopristiformes: Rhinidae) is described from mature male and female specimens from southern Japan. A juvenile specimen, newly born from a captive individual collected from Kagoshima, is also referenced (non-type). The new species can be distinguished from congeners by a combination of its obtusely wedge-shaped snou...
Article
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Several volcanic islands and submarine volcanoes exist in the sea connecting the Izu-Bonin Islands with the Mariana Islands, with trenches and islands formed by the submergence of the Pacific Plate under the Philippine Sea Plate. Although designated as a Marine Protected Area (MPA) in December 2020, the seamounts’ biodiversity has not been sufficie...
Article
Plectranthias kojii sp. nov. (Perciformes: Serranidae) is described from a single specimen [49.4 mm in standard length (SL)] collected from 150 m depth off Hamahiga-jima Island, near Okinawa-jima Island, Japan. Although the new species is most similar to Plectranthias ryukyuensis Wada, Suzuki, Senou and Motomura 2020, morphological characteristics...
Article
Priolepis duostella sp. nov. (Perciformes: Gobiidae) is described based on a single specimen of 28.8 mm in standard length collected from an artificial reef released established for 2.5 years in ca. 100 m depth off Kashiwa-jima Island, Kochi, southern Japan. Within the three species grades of the genus, the new species is included in the “Priolepis...
Preprint
COI-based DNA barcoding could be an efficient tool for species identification of deep-sea fishes and could lead to the discovery of cryptic species diversity. However, the availability of reference sequences of deep-sea fishes for DNA barcoding is limited, especially for fishes in the northwestern Pacific Ocean. In this study, we performed DNA barc...
Book
Full-text available
This book provide in total 4,000 color photographs of 1,406 fish species belonging to 231 families. At least 60 species in this book were described as new species during collection and investigation process, and more unidentified species expressed as “sp.” or “cf.” are undescribed species that need further study. In addition, at least 116 species i...
Article
The zooxanthellate scleractinian species Goniopora stokesi is widely distributed across the Indo-Pacific Ocean, and in Japan the northernmost records of this species are from Tatsukushi, Kochi on Shikoku, although these records are not associated with specimens deposited in museums. The species is unique among Goniopora in that it lives on soft bot...
Article
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Although four species of the engraulid genus Thrissina (often regarded as Thryssa) have previously been recorded from waters around Taiwan, Thrissina encrasicholoides (Bleeker, 1852), known from the eastern Indian and western Pacific Oceans (north to the Philippines), has not been to date. However, two specimens (100.1 and 100.6 mm standard length)...
Article
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Gunnel species (family Pholidae), characterized by an elongated bar-like body and usually found in shallow coastal waters, are mostly restricted to temperate to subarctic waters in the Northern Pacific Ocean, although some in the Western Pacific are distributed southward to the northern East China Sea. Despite the absence of previous records from s...
Article
Full-text available
Liopropoma aragai Randall & Taylor 1988 is redescribed based on the holotype and non-type specimens from Japan and Taiwan. Diagnostic characters of the species and the status of Taiwanese specimens previously referred to L. aragai are reassessed. Liopropoma lemniscatum Randall & Taylor 1988, previously recorded only from the Pacific coast of Japan...
Article
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A new species of the triangular batfish genus Malthopsis Alcock, 1891 is described on the basis of 9 specimens collected from off Taiwan. The new species belongs to a species group with ventral surface covered by numerous small prickle-like bucklers. It differs from the members in this species group in having ventral surface entirely covered with t...
Article
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A new Portholefish, Diplophos vicinia sp. nov., is described on the basis of nine specimens collected from the western Pacific Ocean by commercial midwater trawl. The new species, currently known only from the South China Sea and north of Papua New Guinea, can be easily distinguished from six nominal congeners by the combination of the following ch...
Article
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Onuxodon albometeori sp. nov. (Ophidiiformes: Carapidae) is described from a single specimen collected by commercial trawl off southwestern Taiwan. The new species is most similar to the Indo-Pacific species Onuxodon fowleri (Smith 1955), both process a remarkably slender body, and higher precaudal vertebral counts and a longer pectoral fin, althou...
Article
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The barbeled dragonfish genus Eustomias in Taiwan is reviewed. Five species in three subgenera are recognized, including three new species, a new record, and an unidentified species. Eustomias (Dinematochirus) dendrobium sp. nov. can be distinguished from its congener by its unique barbel structure. Eustomias (Haploclonus) stamen sp. nov. has a uni...
Article
Full-text available
The rare squaretail Tetragonurus pacificus Abe 1953 was described on the basis of a single poor-condition specimen obtained from the stomach of a yellowfin tuna collected from west of the Solomon Islands. A fresh specimen of T. pacificus was recently collected from southwestern Taiwan and its morphology and the fresh coloration are herein described...
Article
Full-text available
A single, deep sea gadiform fish , Melanonus zugmayeri Norman, 1930 (Melanonidae) specimen (194.9 mm standard length) was captured off southwestern Taiwan. This species had been hypothesized to have a circumtropical or subtropical distribution, but o nly a handful of records exist. Since it had never before been reported in Taiwan, the morphology a...
Article
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A single specimen of Scombrolabrax heterolepis Roule, 1921, the sole member of the suborder Scombrolabracoidei, was collected off Dong gang in southwestern Taiwan. Although occurring in tropical a nd subtropical waters worldwide, the only region of the northwestern Pacific where it had previously been found was Japan. Accordingly, this specimen rep...
Book
Full-text available
This book provide in total 4,000 color photographs of 1,406 fish species belonging to 231 families. At least 60 species in this book were described as new species during collection and investigation process, and more unidentified species expressed as “sp.” or “cf.” are undescribed species that need further study. In addition, at least 116 species i...
Article
Twenty-eight species of the genus Scorpaenopsis (Scorpaenidae) have been recognized as valid in the Indo-Pacific Ocean, and 11 species of which having been recorded from Taiwan. Scorpaenopsis orientalis Randall et Eschmeyer, 2002 was originally described on the basis of type specimens collected from Miyazaki, and the Ogasawara Islands in Japan, and...
Article
A new scaleless dragonfish, Photonectes (Photonectes) banshee sp. nov., (Stomiiformes: Stomiidae: Melanostomiinae) is described from three specimens collected from off southwestern Taiwan. The new species can be distinguished from its congeners in the subgenus in having unique counts of photophores: IP, ventral series anterior to pectoral-fin base...
Article
Full-text available
Species of the genus Oxymetopon (Gobioidei: Microdesmidae) have never been recorded from Taiwanese waters. The main objective of this paper is to document the presence of this genus in the waters of Taiwan. A single specimen (99.2 mm standard length) of genus Oxymetopon was collected from south-western Taiwan in 2017. The morphology and fresh color...
Article
Full-text available
Six species of the genus Pterocaesio (Caesionidae) have previously been recorded from Taiwanese waters. Although Pterocaesio tessellata Carpenter, 1987 is known from the eastern Indian to the western Pacific oceans north to the Philippines, it has not previously been reported from Taiwan. The main objective of this paper is to document the presence...
Article
Full-text available
The distributional range of Xeniamia atrithorax Fraser and Prokofiev, 2016, previously recorded only from central Vietnam, is extended northward to Taiwan on the basis of seven specimens (20.5–31.1 mm standard length). A detailed description is provided for the specimens, including fresh coloration, which was previously unknown for the species.
Article
Radiicephalus kessinger sp. nov. (Lampridiformes: Radiicephalidae), described from a single specimen collected off southwestern Taiwan, represents a formerly monotypic and rarely collected family, known almost entirely from the eastern Atlantic Ocean, although some unsupported larval records exist from the north and eastern Pacific oceans. Radiicep...
Article
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In total, 31 species of genus Parupeneus are recognized, and 13 of these have been recorded from Taiwanese waters. Although the long-barbel goatfish, Parupeneus macronemus (Lacepède, 1801) has been previously known from western Pacific Ocean north to Philippines without voucher specimens, no records were reported from Taiwan. The main objective of...
Article
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Twelve species of the genus Plectorhinchus have been recorded from Taiwanese waters. Although Plectorhinchus polytaenia (Bleeker, 1853) is known from Indo–West Pacific north to Philippines, it has not previously been reported from Taiwan. The main objective of this paper is to document the presence of this species in the waters of Taiwan. Three spe...
Article
Full-text available
Specimens of the razorback scabbardfish Assurger anzac (963-2200 mm standard length) were collected from off Okinawa and Daito islands, and Uchinoura Bay in southern Kyushu. The species had previously been recorded only from the mainland of Japan. In addition, the morphology of this species is poorly known especially in small individuals, and thus...
Article
Heteroconger fugax sp. nov. (Congridae: Heterocongrinae) is described from a single specimen collected from Amami-oshima island, Japan. The new species is most similar to Heteroconger tomberua Castle & Randall 1999, known from Fiji and New Caledonia, in having a remarkably slender body with numerous small spots and a vertebral count close to 200. H...
Article
A new species of damselfish, Abudefduf nigrimargo (Pomacentridae), is described on the basis of six specimens (91.8–119.5 mm standard length; SL) from Taiwan. Although similar to A. caudobimaculatus Okada and Ikeda 1939, A. saxatilis (Linnaeus 1758), A. troschelii (Gill 1862) and A. vaigiensis (Quoy and Gaimard 1825) in having five dark bands on th...
Article
Uropterygius Rüppell, 1838 (Muraenidae) currently includes 21 valid species, six (one unidentified) having been recorded from Japanese waters, mostly off the Pacific coast of southern Japan to the Ryukyu Archipelago. The genus is characterized by a moderately elongate, laterally compressed body, the median fins restricted to the tail tip, and a sma...
Article
The third specimen of a rare velvetfish Cocotropus possi Imamura and Shinohara, 2008, previously known only from two type specimens from the Okinawa Islands, was collected at a depth of 15 m from Taira-jima island, Tokara Islands, Ryukyu Archipelago, Japan. The specimen represents the northernmost record for the species. Because the species was ori...
Article
Full-text available
Until recently, eleven species of the genus Cephalopholis (Serranidae) have been recorded from Taiwanese waters. Although Cephalopholis cyanostigma (Valenciennes, 1828) was previously known from the western Pacific Ocean north to Philippines, no records have been reported from Taiwan. The main objective of this study was to document the presence of...
Article
A comprehensive list of fishes from Amami-oshima Island, the Ryukyu Islands, Japan, is reported for the first time on the basis of collected specimens and literature surveys. A total of 1615 species (618 genera, 175 families and 35 orders) are recorded with specimen registration numbers (if present), localities and literature references. Preliminar...
Article
Abudefduf caudobimaculatus Okada and Ikeda, 1939 recently resurrected as a valid species distinct from A. vaigiensis (Quoy and Gaimard, 1825) under which it had been synonymized, is characterized by a series of distinct morphological and color features, including a pair of black spots on the caudal-fin base, a diagnostic character. However, examina...
Article
Full-text available
Previous surveys of fishes of Yonagunijima Island, the westernmost island of Japan, have recorded a total of 603 fish species (104 families). Field sampling was recently carried out at the island resulting in an additional 30 species recorded from Yonaguni-jima Island for the first time, plus a further 7 species now represented by voucher specimens...
Article
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Three specimens (88.9-155.2 mm standard length) of the Banana fusilier Pterocaesio pisang (Caesionidae) were recently collected from waters around southern Taiwan. Although evident in some previous underwater photographs, this western Pacific Ocean species had not conclusively documented north of the Philippines. Therefore, the present samples repr...
Article
Full-text available
A single individual of the halfbeak Hemiramphus archipelagicus Collette & Parin, 1978 (Hemiramphidae) was recently collected off the southwestern coast of Taiwan, representing the first Taiwanese specimen and, furthermore, the northernmost record of this species; it was previously thought to only extend as far north as the Philippines. It is also t...
Article
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A total of 53 specimens of Pempheris oualensis Cuvier, 1831 was collected from Tanega-shima, Yaku-shima, Kuchierabu-jima, Nakano-shima, Amami-oshima, and Tokuno-shima islands in the Satsunan Islands, Kagoshima Prefecture, southern Japan. The species has previously been recorded in Japanese waters only from the Yaeyama Islands, Okinawa-jima island,...
Article
Two specimens (304.0-441.4 mm total length) of Uropterygius fasciolatus (Regan, 1909) were collected from Yonaguni- jima island, the westernmost island in Japan. This species was previously known from Indonesia, Papua New Guinea, the Solomon Islands, Palau, the Tokelau Islands, and the Phoenix Islands. Therefore, the present specimens represent the...
Article
Two specimens (304.0–441.4 mm total length) of Uropterygius fasciolatus (Regan, 1909) were collected from Yonaguni-jima island, the westernmost island in Japan. This species was previously known from Indonesia, Papua New Guinea, the Solomon Islands, Palau, the Tokelau Islands, and the Phoenix Islands. Therefore, the present specimens represent the...
Article
Full-text available
A single specimen (30.4 mm standard length) of Pseudoplesiops immaculatus Gill & Edwards, 2002 (Pseudochromidae) was collected from Taira-jima island in the Tokara Islands, Ryukyu Archipelago. This species had been previously known from voucher specimens from the eastern Indian Ocean and the Pacific Ocean north to Taiwan. Therefore, the present spe...
Article
2017. First specimen-based records of the Blackcheek Moray Gymnothorax breedeni from Yonaguni-jima island, Japan. Japan. J. Ichthyol., 64(1): 31-35. Abstract The genus Gymnothorax Bloch, 1795, a highly speciose group belonging to the family Muraenidae, currently comprises 126 valid species from tropical to temperate areas. Most of the 37 species al...
Article
Full-text available
Six species of family Pempheridae, Parapriacanthus ransonneti, Pempheris adusta, Pe. japonica, Pe. oualensis, Pe. schwenkii, and Pe. ufuagari, were collected from the Ogasawara Islands on the basis of a field survey. Of these, four species represent the first specimen-based records from the islands. Parapriacanthus ransonneti, Pempheris japonica an...
Article
Full-text available
Two specimens (304.0–441.4 mm standard length) of the species of genus Lophotus were recently collected from the southwestern Taiwan at the Dong-gang Fish Market. Although all of the valid species of genus Lophotus were estimated to be distributed circumglobal, substantiated records were unknown from Taiwan. Therefore, morphology and fresh colorati...
Article
Full-text available
Specimens of two scabbardfish (Trichiuridae), Evoxymetopon poeyi Günther, 1887 and Evoxymetopon taeniatus Gill, 1863, were recently collected from waters of southern Taiwan. Neither species has been recorded frequently in Taiwan, and their morphology is poorly documented. Therefore, detailed descriptions of both species are provided herein based on...
Article
Full-text available
Specimens of the Orange Goatfish, Mulloidichthys pflugeri, were collected from off Amami-oshima and Yonaguni-jima islands in the Ryukyu Archipelago, Japan. Previously M. pflugeri has been recorded in Japanese waters only from Okinawa-jima island and the Ogasawara Islands. Therefore, the present specimens are the first distributional records from ea...
Article
Three specimens (31.6-38.2 mm standard length) of Cypho zaps Gill, 2004 (Pseudochromidae), previously known from voucher specimens only from Indonesia, the Philippines, and southern Taiwan, were collected off Yonaguni-jima island, Yaeyama Islands, southern Ryukyu Islands. They were clearly distinguished from the only known other congener, C. purpur...
Article
Full-text available
A single specimen (577.0 mm standard length) of the genus Epinephelus was collected from off Tokashiki-jima Island in the Kerama Islands, Ryukyu Archipelago. This specimen is herein identified as Epinephelus radiates (Day, 1867), as it has 11 dorsal-fin spines, 14 dorsal-fin soft rays, 3 anal-fin spines, 8 anal-fin soft rays, 18 pectoral-fin rays,...
Article
Full-text available
2 個体が採集された。これら の標本は、体側後半部に繊毛域があること、背鰭が 5 棘 24 軟条であること、体側後半部の 体色が暗色とならないこと、光彩が黄色いことなどキイロハギ Zebrasoma flavescens (Bennett 1828)の識別的特徴を多くもっていた。しかし、両標本は、体色が一様に黄色であるという キイロハギにおける通常の特徴と著しく異なり、左右の体側および鰭に広い白色域が、背鰭 起部付近に黒色域が、それぞれみられた。ただし、2 個体の白色域のパターンが同一でない こと、2 個体とも左側と右側の体色パターンに変異がみられること、およびその他の識別的 特徴が先行研究で示された本種の特徴と一致したことから、両標本はキイロハギの色彩変 異個体であると判断した。 キーワー...
Article
The fresh water species Green Swordtail Xiphophorus heller Heckel, 1848, endemic to central and northern America, was introduced to Japanese waters in the 1960’s, established populations being recorded on Kume-jima island and Okinawa-jima island (Okinawa Prefecture), and in Yamanashi Prefecture. A single specimen (39.9 mm SL) of Green Swordtail, co...
Article
Field sampling has never been performed in Yoro-jima and Uke-jima islands in the Amami Islands, Ryukyu Archipelago, southern Japan. 172 species (50 families) and a single species have previously been reported from Yoro-jima and Uke-jima islands, respectively, but these records (except for a single species from Uke-jima island) were based on visual...
Article
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Two specimens of the Pughead Pipefish, Bulbonaricus brauni, were collected from shallow water of Amami-oshima island, central Ryukyu Archipelago, Japan. Previously B. brauni has been recorded in Japanese waters from the Yaeyama Islands, Okinawa-jima island, and the Ogasawara Islands. Therefore the present specimens represented the first record from...
Article
Full-text available
Five specimens of the Spotbase Burrfish, Cyclichthys spilostylus, were collected from the waters around Okinawa-jima Island, Ryukyu Archipelago, Japan. The species had only been recorded from Ishigaki-jima Island in the Yaeyama Islands, Tosa Bay in Shikoku, as well as from Toyama Bay and Sadoga-shima Island in the Sea of Japan in Japanese waters. T...
Article
A single specimen (25.8 mm standard length) of a serranid fish, Liopropoma tonstrinum Randall and Taylor, 1988, was collected from Minami-daito Island in the Daito Islands, southern Japan. This species was previously known based on specimens from Christmas Island in the eastern Indian Ocean, and various islands in the Pacific Ocean, including the S...
Article
Full-text available
Single specimens of two lutjanid species, Lutjanus madras and L. dodecacanthoides, were recently purchased from Okinawa-jima Island, Ryukyu Archipelago, Japan. Both species had only been previously recorded from Iriomote-jima Island and the Yaeyama Islands in Japan, and were never subsequently reported after these first Japanese records. Thus, thes...
Article
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The reproductive characteristics of Pempheris adusta were studied in 233 specimens collected from May 2006 to October 2010 on Okinawa Island, Japan. The main spawning season was estimated during April to June, but spawning occurred year round. Standard length at first maturity occurred at ca. 110mm in both sexes. Batch fe-cundity of P. adusta was c...
Article
Four species of the fish genus Pempheris are recognized for the Red Sea: P. adusta Bleeker, 1877; P. mangula Cuvier, 1829; P. nesogallica Cuvier in Cuvier & Valenciennes, 1831; and a new species P. tominagai. All are wide-ranging in the western Indian Ocean, and P. mangula has migrated via the Suez Canal to the eastern Mediterranean Sea. Morphologi...
Article
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A single specimen of Photoblepharon palpebratum (Boddaert, 1781), formerly limited to the tropical western Pacific, was collected from Okinawa Island, Japan at a depth of 1 m. The specimen was characterized by the following combination of characters: single dorsal fin with 3 spines; a black shutter lifting to cover the subocular organ; a large whit...
Article
The diagnostic morphological characters of Pempheris adusta Bleeker, 1877 (Perciformes, Pempheridae) are redescribed based on specimens collected from the Pacific Ocean. The Japanese name Ryukyu-hatanpo has been commonly used for the species in the Ryukyu Archipelago, and is a factor in the taxonomical confusion with Japanese Pempheris. This Japane...
Article
Pempheris ufuagari sp. nov. is described based on 10 specimens, 143.9-196.8 mm in standard length, collected from Mi-nami Daito Island and Ogasawara Islands, which are oceanic islands of Japan. Pempheris ufuagari is characterized by a distinct black spot on the pectoral fin base, a bright yellow dorsal and caudal fin, and a blackish band on the out...
Article
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Adult fish of Pempheris japonica, 1883 collected from western coast of Okinawa Island for first time, on the basis of three specimens. This is the southern record of P. japonica. This species is distinguishable from all other congeners by following combination of characters: scales adherent, and divided to basal and distal halves; 10-11 dorsal soft...
Article
The reproductive biology of Pempheris schwenkii, one of the most common nocturnal fishes in Okinawan waters, was studied using a total of 1834 specimens (3.1-125.9 mm standard length, SL) collected around Okinawa I. The spawning season was estimated to occur from Jan. to June, with a peak from Feb. to May, based on monthly changes in the gonadosoma...
Article
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Six specimens of Pempheris vanicolensis Cuvier, 1831 were collected at Tudumari Beach on Irio-mote Island. This species, P. schwenkii Bleeker, 1855 and P. oualensis Cuvier, 1831 are unique among the genus in possessing the following characters: surface scales cycloid or weakly ctenoid, deciduous, not divided into basal and distal halves, and scaled...
Preprint
Full-text available
Five specimens of Pempheris oualensis Cuvier, 1831 collected from the Yaeyama Islands were purchased at Wholesale Fish Market in Naha, Okinawa Island, Japan. This species and P. schwenkii Bleeker, 1855 are unique among the genus in the following characters: surface scales cycloid or weakly ctenoid, deciduous, not divided into basal and distal halve...

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