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Volume 33, Issue 2
Displaying 1-15 of 15 articles from this issue
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Tyson R. Roberts1986 Volume 33 Issue 2 Pages 95-109
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSBurma and Thailand are inhabited by 14 species of Mastacembelidae, eight Macrognathus and six Mastacembelus. Two new species of Macrognathus are described from Thailand, one with rostral toothplates and one without. Mastacembelus dayi, known only from Burma, is a valid species related to M. alboguttatus; Mastacembelus favus, from Thailand and Western Malaysia, is distinct from its close relative M. armatus.View full abstractDownload PDF (5900K) -
Helen K. Larson, Peter J. Miller1986 Volume 33 Issue 2 Pages 110-118
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTwo new species of the tropical Indo-Pacific gobiid genus Silhouettea, S. evanida and S. hoesei, are described from Darwin and Queensland, and the Cobourg Peninsula, N.T., respectively. S. evanida occurs in pools on intertidal sand flats along beaches and sandy creek mouths, and S. hoesei more sublittorally at 5-6 m on silty sand. A key to western Pacific and Australian species is included.View full abstractDownload PDF (1284K) -
Toru Taniuchi, J. A. F. Garrick1986 Volume 33 Issue 2 Pages 119-134
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSScymnodalatias albicauda sp.nov. is described from two specimens taken at high latitudes (45°S and 49°S). It is distinguished from S. sherwoodi, only known species of the genus, by having white markings on the caudal fin, the second dorsal posterior tip almost reaching the upper caudal fin, shorter snout and head, smaller eye and larger fins. Relationships of Scymnodalatias to the genera Scymnodon, Centroscymnus, and Zameus are discussed, based chiefly on dermal denticle structure. Scymnodalatias and Zameus uniquely share transverse ridges on their dermal denticles, and on this character they are treated as sister-groups. Comments on the above genera, Z. squamulosus and some species of Scymnodon are made to clarify their systematic status. As a result, it is proposed that Scymnodon includes ichiharai, macracanthus, plunketi, and ringens, that Centroscymnus includes coelolepis, crepidater, cryptacanthus, and owstonii, and that Zameus includes squamulosus.View full abstractDownload PDF (4980K) -
Hiroshi Kohno1986 Volume 33 Issue 2 Pages 135-144
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSLarval developments of Pempheris xanthoptera and P. japonica were described on 31 (6.45-22.40 mm SL) and 5 (10.35-35.70mm SL) specimens, respectively, with particular attention to cartilaginous development. Comparison between the two species indicated that P. xanthoptera was discriminated from P. japonica by the following key characters: two supracleithral spines (one in P. japonica); longer pectoral fin; shorter ventral fin; and absence of melanophore on mid-ventral part of lower jaw and anterolateral region of trunk, and web of ventral fin.View full abstractDownload PDF (3945K) -
Hin-kiu Mok, Hung-junn Chang1986 Volume 33 Issue 2 Pages 145-150
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe pelvic spine articulation in 88 non-squamipinne acanthopterygian species belonging to 59 families and 8 orders was examined. For most acanthopterygians, the pelvic bone lacks a foramen for the attachment of the pelvic spine flanges and this structural condition is considered a primitive acanthopterygian state. Only in Caproidae, Leiognathidae, and Polynemidae among the examined species do the pelvic spine flanges fuse through a foramen in the pelvic bone and this articulation is considered most derived. In the remaining acanthopterygians examined, the pelvic spine flanges butt against each other through the pelvic foramen. However, these flanges do not fuse. This structure is considered an intermediate state. The possible phylogenetic implication of these articulating states regarding acanthopterygian phylogeny is discussed.View full abstractDownload PDF (853K) -
Akihiro Kijima, Nobuhiko Taniguchi, Akira Ochiai1986 Volume 33 Issue 2 Pages 151-161
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThree types of mackerel, Scomber species, the typical spotted, non-spotted and their intermediate types collected from three locations in the adjacent waters of Japan were analyzed by starch gel electrophoresis and examined for some morphometric and meristic characters. Clear genetic differences between the typical spotted and non-spotted were observed at six loci, i.e. αGpd-B, Idh-A, Ldh-A, Sod, Hem-1 and Hem-2, out of the 23 loci examined. The intermediate individuals genetically belong to either the spotted or non-spotted type and a genetical hybrid possessing both kinds of allele from the two typical types was not observed at all. These three types could be divided into two groups. Average genetic distances for intra-or inter groups were estimated as 0.006 and 0.414, respectively. Two morphological characters, the length of separated anal spine and the number of interneurai spines associated with the first dorsal fin spine, were found to be significant character separating the two groups. From the above results, the two groups of mackerel were clearly divided into two separate species, Scomber australasicus and S. japonicus.View full abstractDownload PDF (5100K) -
Tsuguo Otake, Kazuhiro Mizue1986 Volume 33 Issue 2 Pages 162-167
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe fine structure of the intra-uterine epithelium of the pregnant blue shark, Prionace glauca, was examined. The intra-uterine epithelium was bilaminar and the underlying epithelial cell was extremely reduced in cytoplasm. Two cytological characteristics were shown in the outer epithelial cell; open inter-cellular spaces closed in the apical portion by a junction complex and, numerous mitochondria distributed in the basal and lateral portions of the cytoplasm. Secretive characteristics were not recognized in the outer epithelial cell, although few regions composed only of mucous cells were seen. The flattened endothelium of the capillary lay closely beneath the epithelium. These structures are thought to facilitate the water-solute transport and gaseous exchange. It suggests that the intra-uterine epithelium is involved in the osmoregulation of the uterine fluid and the exchange of respiratory gases between mother and fetus.View full abstractDownload PDF (7764K) -
Makoto Endo, Shuichi Uchida1986 Volume 33 Issue 2 Pages 168-173
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSArterio-arterio and arterio-venous vasculatures in the gills of eel Anguilla japonica, carp Cyprinus carpio, and yellowtail Seriola quinqueradiata were examined by resin-replica method. Their ampullae and anastomotic capillaries of secondary lamellae exhibited species differences in the structural features. In the infusion of resin into the eel gills for 2, 5, and 10 min, the replica of afferent companion vessels, central venous sinus, efferent companion vessel, and afferent artery was produced, but that of the capillaries in secondary lamellae and efferent artery was not recognizable. This finding suggests more abundant blood circulation in the arterio-venous vasculature than in the arterio-arterio one.View full abstractDownload PDF (9057K) -
Akira Chiba, Yoshiharu Honma1986 Volume 33 Issue 2 Pages 174-179
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSStrange granulated cells in the hypothalamic-hypophyseal ventricle and neurohypophysis of the hagfish, Paramyxine atami, were examined under light and electron microscope. Based on pleomorphic electron dense granules scattered in the entire cytoplasm and eccentrically shifted nucleus, the cells in question were diagnosed as the extravascular granulocytes.View full abstractDownload PDF (9177K) -
Hiroya Takahashi, Yukio Maeno1986 Volume 33 Issue 2 Pages 180-185
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe structure of the testis-sperm duct system of the topmouth gudgeon, Pseudorasbora parva, was examined histologically. In almost all of the young and adult males examined, a cavity was found to exist between the dorsomedian side of the testis and the opposed peritoneal wall. The testicular cavity was generally flat in shape and ran along the entire length of the testis, with a blind end at the level of the common sperm duct. It appeared that the testicular cavity was not implicated in the transport and storage of spermatozoa in the fish. By studying the process of differentiation and development of gonads in juvenile fish, it was confirmed that some germ cells in differentiating testes underwent oogenesis in many cases, and that the cavity was formed by fusion of the distal edge of the testes with the peritoneal wall in quite the same manner as the ovarian cavity. Thus, the testicular cavity of the topmouth gudgeon is homologous with the ovarian cavity and is apparently a preserved vestige of juvenile intersexuality occurring in this species of cyprinid teleosts.View full abstractDownload PDF (8540K) -
Development of Eggs, Larvae and Juveniles of the Puffer, Takifugu chrysops, Reared in the LaboratoryShiro Fujita, Masaaki Shinohara1986 Volume 33 Issue 2 Pages 186-194
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe artificial fertilization of the puffer, Takifugu chrysops (Hilgendorf), was carried out at Sajima in Yokosuka City on May 22, 1984. Hatched larvae were reared for a period of about 150 days. The spawning period seems to extend from mid to late May in the eastern part of Sagami Bay. The eggs were spherical, pale milky white and semitransparent, demersal and adhesive in nature, measuring 1.32±0.04mm in diamter, and with a cluster of small oil-globules.The incubation period was about 162 hours at a water temperature of 17.4 to 21.8°. During embryonic development, the only pigment cells that appeared on the embryo were the black chromatophores. The newly hatched larvae measured from 2.72 to 3.06mm TL, averaging 2.87±0.1mm TL, and 22-23 (9+13-14) myomeres. At yolk absorption, 4days after hatching, the larvae attained 3.64-3.79mm TL. On the 11th day, postlarvae averaged 4.69±0.24mm TL. Larval finfolds disappeared and rudimental dorsal, anal and caudal fins were formed. There were two large clusters of melanophores, one on the back, exteding from the mid-base of the dorsal fin to the caudal peduncle region, the other along the anal fin base. The color of the body began to turn pale green to brownish-orange and spinelike scales appeared on the belly. Eighteen days after hatching (7.02±0.27mm TL), the caudal notochord began to turn up and a “constriction” appeared on the posterior margin of the caudal fin membrane. This notch moved upwards as the notochord upturning advances. The larvae attained full fin ray counts and reached the juvenile stage at 9.1-9.5mm TL, 24 days after hatching. Characteristic black blotches on the back and specific brownish orange body color appeared at the stage of 20mm TL, 24 days after hatching.
The growth during the larval stage and early juvenile stage (24 to 51 days after hatching) were expressed by the following equations, where y is total length (mm) and x is days after hatching.
y1=2.8424×1.0509x (0≤x≤24)
y2=3.7872×1.0372x (24≤x≤51)View full abstractDownload PDF (3463K) -
Tetsuji Nakabo, Sang-Rin Jeon1986 Volume 33 Issue 2 Pages 195-196
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
W. Vishwanath, H. Tombi Singh1986 Volume 33 Issue 2 Pages 197-199
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Toru Takita, Katsuyuki Nakamura1986 Volume 33 Issue 2 Pages 200-203
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Tatsuyoshi Hirata, Akira Goto, Keikichi Hamada1986 Volume 33 Issue 2 Pages 204-207
Published: August 15, 1986
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe frequency distribution of the fork length of 0+ aged masu salmon, Oncorhynchus masou, changed from unimodal to bimodal distribution in autumn of the years from 1982 to 1984 in the Mogusa River of southern Hokkaido, Japan. The bimodal distri-bution consists of two (upper and lower) modal groups. These two groups resulted from a difference in growth rate of 0+ aged individuals in autumn. Fish belonging to the upper modal group are assumed to be potential 1+ smolts. Whether 0+ aged parr transform into smolt or remain as parr in the following spring may be related to the growth rate of fish in the first autumn.View full abstractDownload PDF (482K)
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