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Volume 21, Issue 3
Displaying 1-8 of 8 articles from this issue
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Hitoshi Ida, Jack T. Moyer1974 Volume 21 Issue 3 Pages 113-128
Published: December 28, 1974
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS27 species of apogonid fishes were collected from southern Japan, of which ten species are new to Japanese waters.The widest extention of range among these new records is shown by Apogon semiornatus hitherto unknown east of the Seychelles.Most of the others have previously been known north to the Philippines.Their occurence in Japanese waters is believed to accentuate the homogeneity of the Indo-West Pacific as a whole in fish distribution.The vicinity of Miyake-jima seems to be the northern limit for the establishment of some of the tropical apogonids.Ecology and diagnostic features of several apogonids are discussed and a new species in the genus Apogon from Ishigaki-jima is described.View full abstractDownload PDF (10498K) -
Yasuhiko Taki1974 Volume 21 Issue 3 Pages 129-136
Published: December 28, 1974
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA new cyprinid species, Scaphognathops mekongensis, is described from the Lao Mekong and its tributaries.The new species is distinguished from its only congener, S.stejnegeri, primarily by its much wider lower jaw, less developed lower lip, broader interorbital space, fewer numbers of branched rays in the dorsal and anal fins, and more numerous gill-rakers.On the other hand, S.mekongensis agrees with S.stejnegeri in the basic formation of the snout and mouth, structures of the principal simple dorsal and anal rays, squamation, shape and arrangement of the pharyngeal teeth, number of the vertebrae, and principal body proportions.These similarities clearly indicate their close relationship, and seem sufficient to recognize the new species as congeneric with S.stejnegeri.Status of the genus Scaphognathops still remains obscure.On the basis of similarities in the features of the mouth region and simple dorsal rays, the genus appears related to the Southeast Asian genus Scaphiodonichthys.Scaphiodonichthys acanthopterus is also recorded from Laos.View full abstractDownload PDF (3668K) -
John E. Randall, Richard C. Wass1974 Volume 21 Issue 3 Pages 137-144
Published: December 28, 1974
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCentropyge multicolor is described from the Marshall Islands and Tahiti.It is white dorsally on the body, becoming yellow on the caudal peduncle and fin;the lower head and thorax are yellow, shading through orange to brown on abdomen and lower posterior part of body;there are alternating bars of black and bright blue on the nape.
C.aurantius is described from Samoa.It is distinctive in its deep body (depth about 1.7 in SL), pelvic fins which reach to soft portion of anal fin, fine serrations on preopercle and preorbital, and its predominately orange color with irregular dark bars.View full abstractDownload PDF (3794K) -
Toru Taniuchi1974 Volume 21 Issue 3 Pages 145-152
Published: December 28, 1974
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThree species of hammerhead sharks are distributed in the southwestern waters of Japan.They are Sphyrna mokarran (Rüppell), S.zygaena (Linnaeus), and S.lewini (Griffith and Smith).A key to the Japanese species of Sphyrna is presented.In the surveyed areas catch records show that S.lewini is most abundant whereas S.mokarran is least in number.The density distribution expressed as hook rates by small statistical quadrates indicates that the distribution of these species is almost confined to the west of lines connecting southern Kyushu, the Nansei Islands, and Formosa.They rarely occur far out at sea.The density distribution also shows that they do not make south-north migrations on an extensive scale.Main populations of these species appear to dwell within the East China Sea.View full abstractDownload PDF (2754K) -
Kunio Amaoka1974 Volume 21 Issue 3 Pages 153-157
Published: December 28, 1974
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSA postlarva at the early metamorphic stage was taken from off southern Japan.It was identified as Arnoglossus tenuis Günther on a combination of meristic and other characters.A description and figure of the postlarva are presented.View full abstractDownload PDF (2332K) -
Koichi UENO1974 Volume 21 Issue 3 Pages 158-164
Published: December 28, 1974
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTwo populations of Pseudobagrus aurantiacus (Temminck and Schlegel) are discontinuously distributed in Kyushu and the districts from Kanto north.These two geographically isolated populations were analyzed karyologically as well as biochemically.
Distinct differences in the karyotypes were observed between two populations indistinguishable in the morphological characters.The karyotype of the Kyushu population has a diploid number of 48 consisted of 10 metacentrics, 6 submetacentrics and 8 telo-and subtelocentrcs.While, the karyotype of northern population invariably has 56 chromosomes including 12 metacentrics, 6 submetacentrics and 10 telo-and subtelocentrics.
Lactate dehydrogenase was separated into five major components in the respective population.The results of subunit-dissociation and recombination test with salt solution indicated that the five Isozymes are tetramers composed of two subunits encoded in two different loci, A and B.The electrophoretic mobilities of LDH-B isozymes were clearly different between the two populations, the northern population has a markedly fast anodally migrating LDH-B isozyme.Also, esterase of each population is different in the number of components, activity, and mobility.View full abstractDownload PDF (8215K) -
Akira Ochiai, Hajime Masuda1974 Volume 21 Issue 3 Pages 165-167
Published: December 28, 1974
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn February 10, 1974, a strange hawkfish, 47.0 mm in standard length, 56.5 mm in total length, referred to Oxycirrhites typus Bleeker, which has not previously been reported from Japan was taken at a depth of 40 meter on the coast of Izu, Shizuoka Prefecture.The fish is characterized by having peculiar pectoral fin, the lower several rays of which are unbranched and thickened, elongated snout, well-serrated preopercle and the slender body with reddish fretwork.The specimen examined here agrees with Bleeker's holotype and other specimens of the species obtained from some tropical seas of the Indo-Pacific except for larger eye (4.8 in head length for the present specimen, 5.5 to 6.4 for others), fewer serrations of the preopercle (8 instead of 11 to 23), and moderately forked caudal fin (slightly forked fin in the holotype).View full abstractDownload PDF (2519K) -
Muneo Okiyama, Tetsuo Kawaguchi1974 Volume 21 Issue 3 Pages 168
Published: December 28, 1974
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSA hermaphroditic specimen of mackerel, Scomber japonicus, measuring 35cm in fork length, was collected from off San'in district, the Japan Sea. Its gonad was described with illustration and compared with the known hermaphroditic case in the same species.Histological observation revealed that both testis and ovary might have been functional in this specimen with clear protandric trend.View full abstractDownload PDF (1650K)
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