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Volume 20 (1973)
- Issue 4 Pages 193-
- Issue 3 Pages 135-
- Issue 2 Pages 61-
- Issue 1 Pages 1-
Volume 20, Issue 4
Displaying 1-9 of 9 articles from this issue
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Hiroaki Sorniya, Tamotsu Tamura1973 Volume 20 Issue 4 Pages 193-206
Published: December 31, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSVisual accommodation of 39 teleosts and 4 elasmobranchs were examined by means of the electrical stimulation of the excised eye.Photographs of the eyes were taken before and during the stimulation.From these photographs, the range of accommodation was estimated and compared among the fishes.In most of marine and some of freshwater teleosts, the accommodation was accomplished by the displacement of the lens position.It was found that these teleosts had the range of accommodation from the distance less than the standard length before their eyes to infinity.
Any lens movement due to the electrical stimulation was not observed in all species of elasmobranchs and 4 species of teleosts.Deformation of the eye globe was not observed in any fish species experimented.View full abstractDownload PDF (13853K) -
Kenji Mochizuki1973 Volume 20 Issue 4 Pages 207-210
Published: December 31, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSpecimens of a scombropid fish which is new to Japan were caught near Aoga-shima I., Japan, using vertical long lines.These specimens closely resemble Neoscombrops annectens from South Africa and are tentatively identified with that species. These specimens from Japan are presumably carnivorous, and the condition of the ovary suggests that the spawning season is winter.View full abstractDownload PDF (4084K) -
Teruya Uyeno1973 Volume 20 Issue 4 Pages 211-217
Published: December 31, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSKaryological information on 8 genera in 5 families of the teleostean fish order Osteoglossiformes are presented and compared.Among notopterids, Xenomystus nigri and Notopterus chitala have 42 acrocentric chromosomes in diploid number, whereas Papyrocranus afer has 34 including 4 non-acrocentrics.Two species of mormyrids, Gnathonemus petersii and Marcusenius brachistius have 48 chromosomes.Diploid chromosome numbers of other species examined are Hiodon alosoides, 50; Osteoglossum bicirrhosum, 56; Pantodon bucholzi, 48.Some comments are made on interpretations of their karyotypes.View full abstractDownload PDF (6252K) -
Takashi Iwamatsu1973 Volume 20 Issue 4 Pages 218-224
Published: December 31, 1973
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSOocytes of the orange-red type female of the medaka, Oryzias latipes were isolated 2-3 hours before the germinal vesicle breakdown.They were cultured in vitro in various media and germinal vesicle breakdown, ovulation, and development upon insemination were observed.The medium suitable for oocytes to acquire the developmental capacity was selected from various media.There appeared to be little effect of glucose (0.5-2 mg/ml) or sodium pyruvate (0.1-2 mg/ml) in the external medium on the oocyte maturation. Oocytes could mature in the presence of bovine serum albumin in Yamamoto's salt solution, although they failed to mature in Yamamoto's salt soultion without bovine serum albumin. Bovine serum albumin was dispensable for the medium which was finally selected for oocyte culture.Composition of salts in the most suitable medium was as follows: NaCl 6.5 mg/ml, KC1 0.4 mg/ml, CaCl2·2H2O 0.15 mg/ml, and adjusted by N/10 NaHCO3 to pH 7.3.View full abstractDownload PDF (920K) -
Fumio Kato1973 Volume 20 Issue 4 Pages 225-234
Published: December 31, 1973
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSThe ecology of the sea-run form of Oncorhynchus rhodurus Jordan and McGregor found in Ise Bay, Japan, has been studied.
October in one-year-old fish.The females outnumber the males in the smolt stage. In winter the smolts descend into Ise Bay, and there they grow up rapidly, feeding mainly on fishes, such as Salangichthys microdon and Limanda yokohamae.In the spring of the second year of their life (mostly in May) they ascend the river to spawn in the autumn. On the other hand, the fluviatile form of O.rhodurus lives in the upper stream of Nagara River, and matures mostly in the autumn of the second year of its life.It is presumed that the trouts living in Nagara River and Ise Bay belong to the same population of O. rhodurus.View full abstractDownload PDF (8818K) -
Ryo Suzuki1973 Volume 20 Issue 4 Pages 235-238
Published: December 31, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Hirokazu Kishimoto1973 Volume 20 Issue 4 Pages 239-241
Published: December 31, 1973
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSA young of Holacanthus tritnaculatus Lacépéde was kept alive for 104 days in an aquarium.The specimen was collected in Suruga Bay, Japan, on November 11, 1972.The specimen represents the first record of this species from Suruga Bay.The change in the color pattern with growth to described here first time for this species.
Some differences in characters are noted between the former description of this species by various authors (especially Fraser-Brunner, 1933) and 5 adult specimens collected in Japan.View full abstractDownload PDF (3308K) -
Kiyoshi Maruyama, Kenji Ono1973 Volume 20 Issue 4 Pages 242-244
Published: December 31, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA cetomimiform fish, Barbourisia rufa Parr were hitherto known from Gulf of Mexico, Madagascar, . and north-west Pacific (Kurile Islands and Hokkaido).A female specimen (193 mm in total length) was collected by a deep-trawling in the water 692-715 m drawn from 39°32.4': 142°23.7, to 39°48.8': 142°30.5'.The morphometric and meristic characters of the present specimen agree with those records.The locality where the fish was collected is southernmost in the waters of Japan; further southern extention of the record is anticipated.View full abstractDownload PDF (2056K) -
Koji Maekawa1973 Volume 20 Issue 4 Pages 245-247
Published: December 31, 1973
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe sea-run form of the Dolly Varden (Salvelinns malma) has not been recorded from Hokkaido, excepting two anadromous males (Flikita, 1962; Ishigaki, 1967).On April 23rd, 1972, a silvery specimen of the Dolly Varden, immature female and 153.1 mm in total length, was collected from the Shoji River in the Shiretoko Peninsula, northeastern Hokkaido. It was identified as a smolt of the Dolly Varden, and is a new record from Hokkaido. The tip of the dorsal fin was jet black and posterior margin of the caudal fin was faintly edged with black.
No significant differences were recognized.in the number of vertebrae, pored scales, pyloric caeca, and gill rakers, between the smolt and river resident form from the same district.
It was considered, from the point of geographical variation of the fish and geographical aspects of the Shiretoko district, that the fish might have hatched in the Shoji River.View full abstractDownload PDF (2300K)
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