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Volume 39, Issue 1
Displaying 1-15 of 15 articles from this issue
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Kunio Sasaki1992 Volume 39 Issue 1 Pages 1-7
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTwo new species of the sciaenid genus Nibea are described; N. squamosa from northern Australia and Papua New Guinea and N. microgenys from northern Australia. Both species differ from all known congeners in having a small, inferior mouth, with the lower jaw teeth uniform in size. N. squamosa is distinguished from N. microgenys by a higher number of lateral line scales (57-60 vs. 48-50), the last pleural rib on the 11th vertebra (vs. 10th), and a longer and more slender caudal peduncle (length 25.9-30.4%SL, depth 6.3-7.9% SL vs. 21.5-26.3, 8.0-10.3). N. squamosa exhibits hyperostosis in some elements, such as the frontals and dorsal and anal pterygiophores.View full abstractDownload PDF (1128K) -
Shigeru Shirai, Soichi Hagiwara, Kazuhiro Nakaya1992 Volume 39 Issue 1 Pages 9-16
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA new catshark, Scyliorhinus tokubee sp.nov., is described based on specimens from the coast of Shirahama, eastern Izu Peninsula, southern Japan. The present species is distinguished from other congeners in having a particular coloration with dark saddles, blotches and numerous small light spots, a wide oral cleft, the anterior nasal flap not reaching the oral cleft, a short interspace between the dorsal fins, developed clasper hooks, and some meristic characters (number of vertebrae, jaw teeth, and spiral valve turns). This species has been bred under captivity for several years in Shimoda Floating Aquarium.View full abstractDownload PDF (2738K) -
Shoou-Jeng Joung, Che-Tsung Chen1992 Volume 39 Issue 1 Pages 17-23
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTwo forms of the lanternshark, Etmopterus, reported from Taiwan waters under the name Etmopterus lucifer were reexamined. E. lucifer sensu Teng (1959), Chen (1963) and Shen and Ting (1972) does not conform to the original description of E. lucifer Jordan et Snyder, 1902. One form described by Shen and Ting (1972) conforms to E. splendidus Yano, 1988, whereas another form reported by Teng (1959) and Chen (1963) agrees well with E. molleri (Whitley, 1939). These were identified based on a combination of the following characters: shape and length of the flank and caudal markings, position of the posterior end of flank markings, shape of the upper teeth, distributional patterns of dermal denticles on the second dorsal fin and preoral area, and length of the caudal peduncle.View full abstractDownload PDF (4165K) -
Midori Kobayakawa1992 Volume 39 Issue 1 Pages 25-36
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe shape and development of bony elements of the neurocranium and suspensorium were studied in three species of Japanese catfish (Silurus) from the viewpoint of comparative morphology. In S. asotus and S. biwaensis the order of appearance of the bony elements was similar, but the ossification of most elements was delayed in S. lithophilus. The neurocranium and suspensorium of adult S. lithophilus retain juvenile features compared with the other two species. On the other hand, in the skull of S. biwaensis the sagittal crest of the supraoccipital, the ridge of the pterotic, and the hyomandibular process are more developed than in the other two species.View full abstractDownload PDF (1385K) -
Kazuhiro Nakaya, Shigeru Shirai1992 Volume 39 Issue 1 Pages 37-48
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe deep-benthic chondrichthyan fishes collected by 584 hauls of otter-trawl from the Okinawa Trough, Kyushu-Palau Ridge, Pacific continental slope off northern Honshu Island (“Tohoku Slope”) and continental slope of Okhotsk Sea off Hokkaido (“Okhotsk Slope”) were analyzed. Sixty-one species were recorded from 200 to 1, 520m in depths; 37 species from the Okinawa Trough, 10 from the Kyushu-Palau Ridge, 18 from the Tohoku Slope, and nine from the Okhotsk Slope.
The Okinawa Trough has the most varied composition, with many species of the Squalidae, Scyliorhinidae, and Rajidae (genus Raja). The Kyushu-Palau Ridge has a relatively high number of squalid species, but no species of the Rajidae or Chimaeriformes. The Tohoku Slope fauna is relatively varied, comprising six families, of which the Rajidae (genus Bathyraja) is the most numerous, followed by the Squalidae. The Okhotsk Slope has the least number of species, and is characterized by a remarkable dominance of the Rajidae (genus Bathyraja).
In addition, the Japan Sea was included in the analyses, based on literature records, enabling coverage of all the main regions around the Japanese Archipelago.
The distributional characteristics of the major taxonomic groups, i.e. Scyliorhinidae, Squalidae, Rajidae and Chimaeriformes, were discussed, and the Shichito-Iojima Ridge, which runs from the Izu Peninsula southward to the Ogasawara Islands and Iojima Islands, was proposed as an effective barrier for deep-benthic chondrichthyan fishes at least, especially for those of the northern regions.View full abstractDownload PDF (3128K) -
Jinnie R. Mamhot, Takakazu Ozawa, Yasuji Masuda1992 Volume 39 Issue 1 Pages 49-58
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSRegular collections of ichthyoplankton were made with a larva net at 9-14 stations from Oct. 1983 to Dec. 1988 in Kagoshima Bay, totalling 817 collections from 66 cruises. A total of 2172 bregmacerotid larvae obtained from 195 collections of 33 cruises were identified as B. atlanticus (2001), B. neonectabanus (169), B. macclellandii (1) and B. nectabanus (1, tentative identification). The peaks of mean densities of larvae collected occurred in autumn for B. atlanticus and B. neonectabanus. The larvae of B. atlanticus occurred throughout the bay, and their densities and frequency of occurrence were lower in the northern part of the bay. In the southern part of the bay, stations in its southwest quadrant showed higher densities than the others. The larvae of B. neonectabanus occurred only in the southern part of the bay in which stations in the northwest quadrant showed higher densities than the others.View full abstractDownload PDF (1366K) -
Yoshioki Oozeki, Pung-Pung Hwang, Reijiro Hirano1992 Volume 39 Issue 1 Pages 59-66
Published: June 15, 1992
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSLarval development of laboratory reared Japanese whiting, Sillago japonica, was described according to morphological and histological observations of the development of organ systems. The development of larvae from hatching to the early phase of the juvenile period was classified into ten stages. These ten stages were grouped into three phases that were characterized by the marked development of certain organ systems: Phase I-the digestive organs, Phase II-the locomotor and respiratory organs, and Phase III-other morphological features that are characteristic of adult fish. These phases corre-sponded to yolk-sac larval stage, larval stage and transformation stage, respectively. Dry weights and six specified linear dimensions of the larvae were measured throughout the larval period. A power function best described the relationship between the total length and the dry weight from day 5 to day 27. This detailed serial description of the stages of larval development should be useful for future experimental studies on the Japanese whiting.View full abstractDownload PDF (1113K) -
Kazunari Yano, Akira Nakamura1992 Volume 39 Issue 1 Pages 67-83
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe behavior of chum slamon, Oncorhynchus keta, was studied using ultrasonic telemetry in the waters off the Okhotsk coast of Hokkaido from 1979 to 1981. Thirty-six adult fish were outfitted with a 50KHz ultrasonic transmitter provided with either a depth sensor, depth/illumination sensors, or depth/temperature sensors. Twenty-one of the experimental fish were used as controls and left intact. Of the remaining fish, six had their sight destroyed, seven had their olfactory nerves severed or their nares filled with wax, one had both senses destroyed, and one had a sham operation, but had only a shallow transverse cut made in the skin over the olfactory nerves. Control fish and the fish with the sham operation initially swam in a horizontal zigzag pattern while fish with an obliterated sense swam in a similar pattern but to a reduced extent. The horizontal and vertical speeds of the intact fish were faster than those of the fish with a destroyed sense. Amplitude of vertical movements of the intact fish stretched from surface to bottom, while fish with destroyed vision tended towards midwater. Fish without an olfactory sense tended to be at the surface or near the bottom. Regular vertical movement would be effective in refreshing olfactory epithelia which might become acclimated when exposed to one odor. The vertical movements can be found in the horizontal zigzag movements in coastal and near shore migrations, as well as in the stream phase of homing. The zigzag movements, both horizontal and vertical, allow the fish to sense the water masses and locate the correct tributary.View full abstractDownload PDF (1878K) -
Tadahisa Seikai1992 Volume 39 Issue 1 Pages 85-92
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTwo groups of larvae of the Japanese flounder, Paralichthys olivaceus, were reared in the laboratory. The survivors of the first group (normal) showed normal pigmentation, and the second group (albinic) exhibited nearly complete pseudoalbinism after metamorphosis. The process of pigment cell differentiation on the left and right sides was observed mainly by transmission electron microscope (TEM) in relation to metamorphosis.
In the normal group, chromatoblasts in the left side skin differentiated successfully, but those in the right side skin showed shrinkage and collapse during metamorphosis. Mucus cells are known as typical cells of ocular side skin in flatfish. The ratio of mucus cell density (left side/right side) increased from the onset of metamorphosis. These results suggest, some components of skin changed asymmetrically in process of metamorphosis before differences in fine structures of chromatoblasts were detected between the left and right sides of the normal group.However, in the albinic group, the same process of chromatoblast collapse occurred on the left and right sides, and there was no change in the ratio of mucus cell density during metamorphosis.View full abstractDownload PDF (10436K) -
Nalini Agrawal, Ajay Kumar Mittal1992 Volume 39 Issue 1 Pages 93-102
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn Rita rita the upper lip is associated with the rostral cap and the lower lip with a skin fold. The epithelia of the lips, which are modified with respect to the peculiar feeding behaviour of the fish, are mucogenic. The superficial layer of epithelial cells, in addition to the mucous cells, are involved in active secretion of mucopolysaccharides. Mucus, apart from its diverse functions, as in fish epidermis, lubricates the epithelia giving protection against possible mechanical injury during the searching and catching of prey from bottom debris. Furthermore, the epithelia are thick, an adaptation to their mucogenic nature, so as to provide additional protection. The contents of the club cells are proteinaceous, which correlates with the helical filaments reported in similar cells in fish epidermis. Characteristic ridges on the surface of the lips are considered to be an adaptation to assist in manipulation during the procuring of food. Mucus secreted in the grooves between them reduces friction and prevents the deposition of foreign matter. The skin fold facilitates an increase in gape. The taste buds and ampullary organs, which on the lips and the rostral cap are associated with the localization of prey and triggering of a pick-up reflex, are not located on the skin fold, as the latter often remains concealed between the lower lip and the ventral head skin. The importance of histochemical analysis as a supplement to histological studies is emphasised.View full abstractDownload PDF (8572K) -
Tetsuji Nakabo, Akihisa Iwata, Yuji Ikeda1992 Volume 39 Issue 1 Pages 103-106
Published: June 15, 1992
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESS -
Kiyoshi Fujita1992 Volume 39 Issue 1 Pages 107-109
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Yasunori Sakurai, Kaoru Kido1992 Volume 39 Issue 1 Pages 110-113
Published: June 15, 1992
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
1992 Volume 39 Issue 1 Pages 134b
Published: 1992
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSDownload PDF (74K) -
1992 Volume 39 Issue 1 Pages 134a
Published: 1992
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSDownload PDF (74K)
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