All issues
Volume 32, Issue 1
Displaying 1-16 of 16 articles from this issue
- |<
- <
- 1
- >
- >|
-
Jørgen G. Nielsen, Yoshihiko Machida1985 Volume 32 Issue 1 Pages 1-5
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSBarathronus maculatus Shcherbachev, 1976 was until now known by two records only, both from off Southeast Africa.Three additional specimens, two of which are from off Japan and one from off Madagascar, are treated here.A redescription with illustrations of e.g.the characteristic copulatory apparatus is given.View full abstractDownload PDF (634K) -
Kaoru Kido1985 Volume 32 Issue 1 Pages 6-17
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFive species of liparidid fishes, Careproctus canus sp.nov., C.zachirus sp.nov., C.simus, C.bowersianus and C.pycnosoma, are described or redescribed from the Bering Sea.C.canus is distinguished by its trilobed teeth, gill opening wholly located above pectoral fin, 18-24 pyloric caeca, pale peritoneum and stomach, absence of postocular pore, and one suprabranchial pore.C.zachirus is characterized by its long upper pectoral fin lobe, 28-31 pectoral and 11 caudal fin rays, one suprabranchial pore, and coloration of each fin.Second records of C.bowersianus, C.simus and C.pycnosoma are reported.C.pycnosoma described here is the first record from the Bering Sea.View full abstractDownload PDF (1688K) -
William F. Smith-Vaniz, Tetsuo Yoshino1985 Volume 32 Issue 1 Pages 18-27
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTwo new jawfishes, Opistognathus decorus and O.liturus are described from Okinawa and Shirahama-cho, Wakayama Prefecture, respectively.They are readily distinguished from all other species of Opistognathus having 11 or 12 segmented dorsal fin rays by the possession of prominent, irregular dark blotches on the head.Opistognathus decorus differs from O.liturus most notably in having more gill rakers on the first gill arch, 41-44 (versus 31), smaller orbit diameter, 7.9-9.0% SL (vs.12.3), wider bony interorbital, 3.8-4.3% SL (vs.1.9), fewer cephalic sensory pores and differently shaped infraorbital bones.A key, diagnoses and synonymies are given for all Japanese species of Opistognathus.View full abstractDownload PDF (3100K) -
Nobuhiro Suzuki, Nobuhiko Akiyama, Takashi Hibiya1985 Volume 32 Issue 1 Pages 28-34
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe development of eggs and larvae, and minute tubercles on the skin surface of larvae of Rhodeus uyekii were observed.The egg and larval development, and minute tubercles on the skin surface of larvae of this species were relatively similar to those of two subspecies, R.atremius atremius and R.atremius suigensis.This species in larval development is characterized by having a yolk sac, which is laterally slender and convex downward at the posteriormost portion, and numerous vestigial minute tubercles on the skin surface except for the wing-like yolk projection.View full abstractDownload PDF (6739K) -
Masanobu Matsuoka1985 Volume 32 Issue 1 Pages 35-51
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe developmental process of all osteological elements except the scale in the red sea bream, Pagrus major, was described from prelarvae to late juveniles.The larvae at first-feeding stage exhibited only some elements of head skeleton and pectoral fin-supports, which were mostly cartilaginous structures except the maxillary and cleithrum.The completion of osteological structures was characterized by the formation of accessory cartilages 7 and 8 of the caudal skeleton and the ossification of middle radials of dorsal and anal fin-supports.Reared and wild specimens reaching this stage seemed to be different in size.An attempt to summarize the osteological development was made on the basis of the counts of considerable changes, e.g., the initial appearance of cartilage, the full complement of cartilages, the beginning of ossification and the full complement of ossified structures for respective elements.A histogram of those counts against total length consisted of several peaks suggesting the ontogenetic intervals in this species.View full abstractDownload PDF (2491K) -
Tsuguo Otake, Kazuhiro Mizue1985 Volume 32 Issue 1 Pages 52-59
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe fine structure of the placenta of the blue shark, Prionace glauca, was observed.The placenta was divided into distal and proximal portions.In the distal portion, an egg-capsule was not present, and maternal and fetal epithelia lay side by side.In the distal portion, the maternal epithelial cells contained many granules, lipid droplets, mitochondria, and developed RER and Golgi complexes.Fetal epithelial cells were covered with microvilli and possessed many small tubular structures and coated vesicles in the apical region.The space between maternal and fetal epithelia was filled with high electron dense and PAS-positive materials which seemed to be derived from maternal epithelium.In the proximal portion, the epithelium was characterized by expanded intracellular spaces.Many mitochondria were scattered in the basolateral portion of epithelial cells.From these morphological observations, it is thought that the fetus obtains its nutrients including macromolecular materials through the placental tissue and through the exchange of water-solute and gases between the uterine fluid and the epithelium of the proximal portion of the placenta or the gill, at least at full-term.Ovoid cells which seemed to be macrophage cells were observed in the intracellular spaces of the fetal placenta.View full abstractDownload PDF (12405K) -
B.B. Jana, A.K. Manna1985 Volume 32 Issue 1 Pages 60-65
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSHue-discriminatory capacity has been tested in three air-breathing teleosts, Channa punctatus, Clarias batrachus and Heteropneustes fossilis.Channa with well-developed eyes and efficiency of vision was successfully trained to discriminate red from green, blue, yellow, grey.and violet.It also distinguished violet from blue, green and grey as well as green from blue.The colour vision mechanism in this fish is mediated through trichromasy.The mud dwellers Clarias batrachus and Heteropneustes fossilis with markedly reduced eyes, showed poor colour-discrimination capacity, and perhaps barbels were evolved in these fishes to compensate their poor power of vision.View full abstractDownload PDF (694K) -
Muderhwa Nshombo, Yasunobu Yanagisawa, Makoto Nagoshi1985 Volume 32 Issue 1 Pages 66-73
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSScale-eating behaviour of Perissodus microlepis was observed in its natural habitat and the stomach contents of individuals at various developmental stages were examined.Young guarded by the parents fed on zooplankters, and juveniles exploited a wide variety of food items: zooplankters, phytoplankters, benthic animals and scales of other fishes.Adults subsisted primarily on scales.Adult P.microlepis removed scales from diverse fish species, most intensively from algae-eating cichlids larger than themselves and with flat bodies.Most of their attacks were delivered from near the substrate.They sometimes ambushed their prey using the underside or crevice of a rock as cover.Fishes engaging in feeding, territorial attacking or courtship display were often attacked.View full abstractDownload PDF (1032K) -
Noritomo Komada1985 Volume 32 Issue 1 Pages 74-78
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe dentition of the ayu, Plecoglossus altivelis, changes during young stages (Matsui, 1938;Chapman, 1941;Suehiro, 1942;Iwai, 1962;Komada, 1980a).In this paper, the development of teeth on the upper jaw are described to be compared with the developmental pattern of teeth on the lower jaw.The present study was based upon about 100 specimens from Lake Biwa (Kohokucho, Shiga Pref.) and about 180 hatchery-reared specimens, measuring from 24 to 60mm in standard length (SL).In the histological examination of jaws, some specimens were serially sectioned at a standard thickness of 8μm.The sections were mostly stained with hematoxiryn-eosin and some stained with azan.The other specimens were stained with alizarin red S.
The first indication of the formation of comb-like teeth is observable at 70 day old specimen (about 24mm SL).At about 32mm SL, 100 day old, a thin stratum of dentine appeared between the ectodermal columnar cells and odontoblast.Then the number of tooth groups on the upper jaw was about seven and about three on the lower jaw.Each tooth group consists of 10 to 20 separated denticles.The teeth constituting the tooth group is roughly in rod shape on the lower jaw and small canine like teeth on the upper jaw.On the upper jaw, teeth located at the anterior part of each tooth group are ankylosed with the pre-maxillary and maxillary, and, they erupt at this stage.The primordia of comb-like teeth are laid externally and separated from the dentary on the lower jaw.At about 40mm SL, teeth on the upper jaw are rod-shaped and they are separated from the pre-maxillary and maxillary.At this stage, the form and arrangement of teeth consisting the comb-like teeth on the upper jaw are similar to that on the lower jaw.These results suggest that the comb-like teeth on the upper jaw are usable to catch micro-crustaceans at the juvenile stage.View full abstractDownload PDF (4692K) -
Yoshikazu Nagata1985 Volume 32 Issue 1 Pages 79-89
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe spawning period and migration of the rose bitterling, Rhodeus ocellatus (Kner) in a small pond, Shimizu-ike, Osaka Prefecture, were investigated from November 1973 to December 1975.
It was suggested that the population was composed mainly of 0-to 3-year-old fish, and the sex ratio was comfirmed to be one.The spawning period was assumed to be from March to September.Means of both ovipositor length and the proportion of individuals possessing ripe eggs of 2-and 3-year-old females took the highest value from April to the end of May, and that of 1-year-old fish was the highest in late July.The minimum size for reproduction was 23-24mm in body length.
In spawning season, males migrated toward the shore where bivalves were distributed in a high density, and matured females migrated several times between the offshore and the near shore, i.e., after they laid eggs into bivalves at the shore they returned to the offshore.View full abstractDownload PDF (1116K) -
Jack T. Moyer, Mitsuhiko Sano1985 Volume 32 Issue 1 Pages 90-92
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
John E. Randall, Greg J. Stroud1985 Volume 32 Issue 1 Pages 93-99
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Keisuke Takata, Akira Goto, Keikichi Hamada1985 Volume 32 Issue 1 Pages 100-103
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Midori Kobayakawa1985 Volume 32 Issue 1 Pages 104-106
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Hitoshi Ida, Izuo Sato, Nobuhiro Miyawak1985 Volume 32 Issue 1 Pages 107-111
Published: May 30, 1985
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
1985 Volume 32 Issue 1 Pages 128
Published: 1985
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSDownload PDF (85K)
- |<
- <
- 1
- >
- >|