All issues
Volume 35, Issue 2
Displaying 1-16 of 16 articles from this issue
- |<
- <
- 1
- >
- >|
-
Kiyonori Nishida, Kazuhiro Nakaya1988 Volume 35 Issue 2 Pages 115-123
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDasyatis acutirostra sp.nov. is described on the basis of 21 specimens from the East China Sea and southern part of Japanese waters. The new species is characterized by having small eyeball (2.4-3.8% of disc width), long snout (36.9-43.9% of disc width), 129-135 pectoral radials, 23-28 pelvic radials, 121-139 prespine separate vertebral centra and 22-24 intestinal valve turns, the absence of oral papillae, and the presence of ventral tail fold. Lectotype and paralectotypes were designated for D. zugei (Müller et Henle, 1841). Taxonomic confusion among D. zugei and its allied species was worked out and D. cheni Teng, 1962 was synonymized with D. zugei.View full abstractDownload PDF (5658K) -
Waikhom Vishwanath, Chungkham Sarojnalini1988 Volume 35 Issue 2 Pages 124-126
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA new cyprinid fish Garra manipurensis is described from the Manipur River of Manipur State, India. The species differs from G. anuandalei Hora of Darjeeling Himalayas in the in-terorbital distance, number of rows of scales and position of vent. The fish is also different from G. lisssorhynchus (McClelland) of the Brahmapulra Drainage and the Assam Himalayas in the coloration of dorsal and caudal fins and scales on the belly.View full abstractDownload PDF (1565K) -
Masaru Shiogaki1988 Volume 35 Issue 2 Pages 127-132
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA new species of the genus Clariger was described on the basis of thirty-two specimens collected from the subtidal zone of Mutsu Bay, Aomori Pref. This species is distinguishable from other congeners in the following: body naked; a series of large white patches on the back, one on the nape passing through the pectoral fin base and axil part; fin rays of both the second dorsal and anal fins, I, 12-14; vertebrae, 34-35; a single free filamentous ray on the upper lobe of pectoral fin. A new key to all the known species of the genus Clariger is prepared.View full abstractDownload PDF (2384K) -
Kazuhiro Nakaya1988 Volume 35 Issue 2 Pages 133-141
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAdditional specimens of the rare Apristurtis herklotsi are reported, and the charac-teristic features of this species are discussed. A. herklotsi is concluded to be a distinct species, having a very long snout, a narrow distance between the nostrils, a long caudal fin, a short abdomen, numerous teeth on both jaws, and a low number of monospondylous vertebrae. A. herklotsi appears to be mature at about 44cm in total length.View full abstractDownload PDF (7005K) -
Walter Ivantsoff, Maurice Kottelat1988 Volume 35 Issue 2 Pages 142-149
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA review of Tirant's collections and examination of types has resulted in the reidentifica-tion of Haplocheilus argyrotaenia Tirant as Hypoatherina valenciennei (Bleeker) which is found throughout the southwestern Pacific and as far north as Japan. The taxonomic status of H. valenciennei is clarified and Bleeker's emendation of the original specific epithet valenciennei to valenciennesi is rejected. The systematic position of this species is difficult to determine since H. valenciennei shows affinities with both Hypoatherinaand Atherinomorus. In the light of the present knowledge, Bleeker's species appears to have greater affinities with Hypoatherina and is therefore placed in this genus.View full abstractDownload PDF (1275K) -
Hirokazu Kishimoto, Peter R. Last, Eiichi Fujii, Martin F. Gomon1988 Volume 35 Issue 2 Pages 150-158
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe monotypic uranoscopid genus Pleuroscopus Barnard, 1927, originally based on a description of the subadult holotype, is redescribed to include the adult form, which has been considered by some recent authors to be a separate species. An examination of additional material of P. pseudodorsalis from southern Africa and Australasia (242-559mm SL) has revealed the presence of two distinct post-juvenile growth forms, with a belated transition stage between them at about 270-365mm SL. Subadults display allometric growth and have greater rugosity and ornamentation of head bones and scales than adults. During the transformation period, growth becomes linear, scales become less obvious and their surfaces less ornamented, and prominent bony ridges of the head exfoliate.View full abstractDownload PDF (7945K) -
Morphometric and Meristic Variation in Ricefishes, Genus Oryzias: a Comparison with Cytogenetic DataHiroshi Uwa, Lynne R. Penti1988 Volume 35 Issue 2 Pages 159-166
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMorphometric and meristic data from type and other material of ricefishes of the genus Oryzias, particularly on O. latipes and O. curvinotus, were retaken to compare relationships of ricefishes indicated by morphological data with the relationships indicated by the cytogenetic analyses (Uwa, 1986). Along with morphometric and meristic characters traditionally used, two morphometric characters are useful for the classification of this genus: the relative length of the abdominal part and the relative position of the dorsal-fin origin. External anatomical data mostly agree with a classification of ricefishes based on karyology; although, like the cytogenetic data, they are not sufficient to distinguish all species, or to define monophyletic groups. Oryzias latipes is widespread in eastern Asia. Oryzias curvinotus, a name applied to ricefish from Hainan Island, is distributed more widely in southern China, including Hainan, Guangdong, Hong Kong, and Hanoi.View full abstractDownload PDF (1055K) -
Akihiro Kijima, Nobuhiko Taniguchi, Akira Ochiai1988 Volume 35 Issue 2 Pages 167-175
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSGenetic distance and the relationships among 15 species of genera Trachurus, Decapterus, Selar, and Selaroides were estimated from 18 electrophoretically detectable isozyme genes. Es-timates of genetic distance (D) between every pair of species within the genus Trachurus ranged from 0.005 to 0.560 with a mean of 0.322, and from 0.484 to 1.868 with a mean of 1.022 within the genus Decapterus. Between species of different genera, estimates of D ranged from 0.786 to 2.863 with a mean of 1.784. From these results, Decapterus species could be considered as having evolved over a long period while Trachurus is a newly arisen genus. A relationship among species suggests that the Decapterus species are expanded to offshore and deep area after being divided into some groups, and that the Trachurus species are divided presumably into at least two groups, one group of which is coastal and the other of which is offshore. Trachurus japonicus and Trachurus novaezelandiae could be considered subspecies on the basis of allelic distribution and genetic distance.View full abstractDownload PDF (3276K) -
Tadashi Andoh, Akira Goto1988 Volume 35 Issue 2 Pages 176-183
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAn electrophoretic study on the biochemical genetics of two sibling river-sculpins Cottus amblystomopsis and C. nozawae was undertaken with the primary objective of clarifying the reproductive isolation between the sympatric populations in three rivers around Cape Erimo of Hokkaido, where their distributions overlap widely along the river courses. At the 3 loci Acp, Ldh and 6Pgd, out of 20 examined loci, evident displacement of alleles were observed between the two species. In addition, no genetical evidences for hybridization between the two species were detected in the three rivers examined. These results strongly suggest that the two species are reproductively isolated from each other even when they are distributed sympatrically and their distributions overlap widely along the course of a river.View full abstractDownload PDF (1186K) -
Noritaka Mochioka, Osame Tabeta, Tadashi Kubota1988 Volume 35 Issue 2 Pages 184-188
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSOne specimen of leptocephalus larva, measuring 16.0mm in total length, was collected from the northern part of Suruga Bay (34°56'N, 138°39'E) by the T/V Bosei Maru II of Tokai University on November 7, 1982. This larva is identified as Conger myriaster because of having melanophores under the eye, simple gut with melanophores, 142 total number of myomeres and the position of the last vertical blood vessel at the 52nd myomere. Judging from the body length, appearances of teeth and fins, and disposition of the anus, the present larva belongs to the pre-leptocephalus stage. The presence of this early larva in this area suggests that one of the spawn-ing grounds of C. myriaster exists in or near Suruga Bay in autumn.View full abstractDownload PDF (684K) -
J. Michael Fitzsimons, William H. Legrande, Jeffrey W. Korth1988 Volume 35 Issue 2 Pages 189-193
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSBagre marinus has a diploid complement of 54 chromosomes composed of 12 meta-centrics, 8 submetacentrics, and the remainder with terminal or near-terminal centromeres. Karyotypes for three species of ariid catfishes (Arius dussumieri, A. felis, and Bagre marinus) in-dicate the same diploid number, but each species has a different arm number. Data for 132 species in 14 families of catfishes show a predominance of 56±2 chromosomes in the diploid set. This range in diploid number is most common in the Ariidae, Bagridae, Ictaluridae, and Pime-lodidae, which, together with the Doradidae (no karyotypes available), have been suggested, from osteology, as forming a group close to ancestral stock from which living catfishes evolved.View full abstractDownload PDF (619K) -
Hiroshi Arai, Shiro Fujita1988 Volume 35 Issue 2 Pages 194-202
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSpecimens of Canthigaster rivulata (Temminck et Schlegel) were collected from Kominato and Hayama, central Japan, from May, 1985 to October, 1986. On the basis of the gonadosomatic index, gonadal histology and results of artificial fertilization of these specimens, the spawning season is considered to extend from late June to mid-September. The specimens exhibited the following dimorphic differences associated with sex: 1) The male is larger than the female. 2) Ventral side of the body is brownish orange in the male with vermiculated or reticulated patterns of bright violet, while it is white in the female. 3) The male has a well-developed skin fold along the mid-dorsal and mid-ventral lines, which is greatly elevated during courtship; whereas the female's skin folds are not or slightly developed and conspicuous only during courtship.In an aquarium with the water temperatures of 22 to 26°C, a pair of fish spawned every four days late in the morning for three consecutive months. Courtship and spawning occurred in a pair. The male swam in front of the female, and elevated the skin folds both dorsally and ventrally, fully spreading the unpaired fins, with the ventral side of the body flashing bright blue and the dorsal side turning dark. Both fish swam in a circular fashion, elevating the skin folds. The male followed the female nudging her abdomen with his snout. Both fish turned upward, and released gametes. The eggs are spherical, 0.53-0.73mm in diameter, demersal, adhesive, transparent, and pale yellowish orange in color, and contain a cross-shaped or asteroid cluster of oil globules. The egg membrane was thick and consisted of about 14 concentric layers. The incubation period ranged from 73.5 hours at 28.2-28.5°C to 145.0 hours at 22.1-22.4°C. The newly hatched larvae were 1.38-1.98mm in total length (TL) with 8+11-13=19-21 myomeres. The yolk was absorbed when the larvae attained 1.49-2.22mm TL, three days after hatching. The larvae were fed on oyster larvae, blue mussel larvae, sea-urchin larvae and rotifers, but all of them died in 16 days. During the embryonic and early larval stages, the only pigment cells that appeared on the body were the black chromatophores.View full abstractDownload PDF (7792K) -
Osamu Katano, Kenji Saitoh, Akio Koizumi1988 Volume 35 Issue 2 Pages 203-211
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSReproductive behaviour of the catfish, Silurus asotus was studied in temporary waters around paddy fields. Spawning occurred nocturnally during the first week from the initiation of irrigation. In reproductive activities, a male first energetically pursued a female with its head near to the female's belly (chasing) and then began to cling to the female's body from the side, bending its tail or head (clinging). Finally the male enfolded the female's body, with its anus near to the female's (enfolding). In some cases, 2-4 males pursued a single female and two males enfolded a female at the same time. Although no aggressive behaviour was evident between males, it was always the largest male that could most frequently approach and enfold the female. The mating pair moved a long distance in a ditch, paddy field and/or creek, performing reproductive activities. It is thought that the spawning site and period of spawning of the fish enable the larvae to avoid the danger of predation and to efficiently feed, firstly on plankton and later on larvae of other fishes which become abundant during the irrigation period. Although some eggs and larvae may die due to the drying out or high water temperatures of such unstable temporary waters, scattering eggs may reduce the incidence of the annihilation of the young.View full abstractDownload PDF (1183K) -
Shigeyuki Kawahara, Yuji Uozumi, Harumi Yamada1988 Volume 35 Issue 2 Pages 212-214
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSStephenson and Robertson (1977) confirmed two species of jack mackerels in New Zealand waters: Traehurus declivis and T. novaezelandiae. Both species are common in northern New Zealand waters, and only the former extends its distribution southwards to Stewart Island. Recently, a few unusually large jack mackerel were found among T. declivis caught in southern New Zealand waters. They seemed to be T. murphyi, which is known to occur only off Chile and Peru (Shaboneyev, 1980).
To clarify taxonomy and distribution of the unfamiliar jack mackerel, samples were collected during the Japan/New Zealand joint trawl survey by the R/V Shinkai Mani in 1986. The survey covered southern and eastern New Zealand waters excluding the Campbell Plateau. Specimens of the unfamiliar jack mackerel were compared with the description for T. murphyi by Berry and Cohen (1974) who reexamined the putative type specimen of Nichols (1920). Comparative specimens from Chile were also measured to supplement their description which is insufficient for proportional measurements. Methods for counts and measurements followed Berry (1968) basically. Fused scales at the posterior end of lateral line were not counted.
Finally, specimens of the unfamiliar jack mackerel were identified with T. murphyi, which is new to New Zealand waters. All the specimens are deposited at Far Seas Fisheries Research Laboratory (FSFRL).View full abstractDownload PDF (2208K) -
Takashi Asahida, Hitoshi Ida, Toshihiro Inoue1988 Volume 35 Issue 2 Pages 215-219
Published: September 20, 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
1988 Volume 35 Issue 2 Pages 225
Published: 1988
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (20K)
- |<
- <
- 1
- >
- >|