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Volume 22, Issue 4
Displaying 1-10 of 10 articles from this issue
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Jack T. Moyer, Hitoshi Ida1976 Volume 22 Issue 4 Pages 189-194
Published: March 31, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSChromis miyakeensis is described as a new species in the family Pomacentridae.Although this fish is rather common in the waters of Miyake Island and locally along the Izu Peninsula, it has previously been mistaken for Chromis notata, from which it differs in having pointed soft dorsal and anal fins instead of rounded fins as in C.notata, a deeper body (50% of standard length), and by blue margins to the fins and a blue tinge to the anterior ventral surface, all lacking in C.notata.View full abstractDownload PDF (7800K) -
Osame Tabeta, Toru Takai, Isao Matsui1976 Volume 22 Issue 4 Pages 195-200
Published: March 31, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe numbers of predorsal, ano-dorsal, preanal, abdominal, caudal, and total vertebrae in and shortly after the elver stage of 9 species and subspecies of eels from the various areas in the world were counted.The numbers of vertebrae in such sections are useful for the specific identification when the ranges of variations do not overlap between the respective species.A key to the species was given based on the sectional counts of vertebrae.Moreover, the graphic representations of the correlation between the number of vertebrae in respective sections facilitate the identification of most species.View full abstractDownload PDF (821K) -
Kunio Amaoka1976 Volume 22 Issue 4 Pages 201-206
Published: March 31, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFive postlarvae were caught off south west Japan.They are identified as Psettina iijimae, P.tosana, and P.gigantea on the basis of combinations of dorsal and anal ray counts.Descriptions and figures of the postlarvae of the three species are presented, and those of the latter two species are given here for the first time.View full abstractDownload PDF (947K) -
Lori J. Bell1976 Volume 22 Issue 4 Pages 207-211
Published: March 31, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAt Miyake-jima, Amphiprion clarkii spawns from May to September.Nesting frequency was 6-8 times per year.Incubation period varied from 6 1/2-13 1/2 days depending on water temperature.Fecundity was estimated 1, 100-2, 500 eggs per spawning and 8, 000-17, 500 per year.About 95% of nests were successful (eggs hatched).View full abstractDownload PDF (856K) -
Akira Chiba, Sumio Yoshie, Yoshiharu Honma1976 Volume 22 Issue 4 Pages 212-220
Published: March 31, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe endocrine and internal organs of stranded specimens of the triggerfish, Canthidermis rotundatus, were studied histophysiologically.The specimens of medium size used were stranded on the beach of Niigata facing the Japan Sea.As they were lightly starved, not so severe changes were detected in the digestive tube, exocrine pancreas, kidney, and spleen with the exception of a large amount of fat deposition in the liver.In the endocrine pancreas, i.e., the Brockmann body, three types of cells (A, B, and D cells) were identified.The ovary was crowded with a number of oocytes in the early growth stages, whereas a considerably large portion of the testis was occupied by spermatogonia in addition to a small number of elaborate spermatozoa.The amount of Gomori positive neurosecretory material produced in the cells of the nucleus preopticus varied considerably according to each specimen.On the other hand, moderate amount of this material was deposited in the pars nervosa.The acidophil neurosecretory material stored in the cells of the nucleus lateralis tuberis was scanty.Seven types of glandular cells were demonstrated in the adenohypophysis: among them, the basophils diagnosed as gonadotrophs contained only a small amount of granules.Therefore, it seemed probable that the triggerfish carried by the northward Tsushima Warm Current in winter were the immature fish in the process of abortive migration.View full abstractDownload PDF (10373K) -
Jin Hattori1976 Volume 22 Issue 4 Pages 221-226
Published: March 31, 1976
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe present study on archaeological materials is concerned particularly with 110 pieces of pharyngeal bones of parrotfishes.They were excavated together with many other fish remains from the shell-mounds located at Ushuku in Amami-Oshima, Omonawa in Tokunoshima, Kagoshima Prefecture, and Shimashihyahma in Kutakajima, Okinawa Prefecture, Japan (Fig.1).The age of the shell-mounds is considered to be the late “Jomon” age (about 3, 000-2, 500 B.P.).There bones were identified by comparison with those of the living species found in the region (Figs.2 and 3).
The characters of the upper pharyngeal which were used to distinguish species of the parrotfishes are: arrangement and number of raws of teeth, and position and shape of each tooth.Those of the lower pharyngeal are: shape of dentigerous surface, number of teeth of a transversal row, arrangement of rows of teeth, and relative height between surface of lateral process and dentigerous surface.
The archaeological specimens identified belonged to three genera and ten species: namely, Scarops rubroviolaceus (Bleeker), Bolbometopon bicolor (Rüppell), Scarus gibbus Rüppell, S.lunula (Snyder), S.sordidus Forsskål, S.taeniurus Valenciennes, S.bowersi (Snyder), S.dimidiatus Bleeker, S.ghobban Forsskål, and S.aeruginosus Valenciennes.View full abstractDownload PDF (6261K) -
Eiichi Fujii, Teruya Uyeno1976 Volume 22 Issue 4 Pages 227-233
Published: March 31, 1976
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSThree species of Notoscopelus: N.japonicus, N.resplendens, and N.caudispinosus were found in Japan.The last species is first time recorded from the western North Pacific, and the second species is recorded here for the second time from Japan.These three species are described and compared with specimens from other parts of the world.The type specimen of N.japonicus was found to be in Field Museum of Natural History, Chicago, with the catalogue number FMNH 80459, and errors in the original description on numbers of various photophores are corrected in this report.View full abstractDownload PDF (4524K) -
Hiromu Kobayasi1976 Volume 22 Issue 4 Pages 234-240
Published: March 31, 1976
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSCytological observations on the nuclei of the ripe egg cells just after spawing were carried out in two kinds of fishes, the kinbuna (Carassius auratus subsp.) and the ginbuna (C.auratus langsdorfii);both were collected from Kasumigaura.The egg cells of the kinbuna contained nuclei at metaphase of the second maturation division and had a first polocyte, while those of the ginbuna showed nuclei at metaphase of a single maturation division without a first polocyte.The mean diameter of the nuclear plates of 20 egg cells was 6.32 μ it for the kinbuna and it was 12.28 μ, a for the ginbuna.The nuclear plate in the ginbuna was twice larger than that in the kinbuna in diameter.Judged from Kobayashi et al. (1970), it is obvious that the ginbuna here used was triploid or tetraploid specimens and the kinbuna was diploid ones.
The developmental process of the oocytes was carefully observed in the ovaries of two triploid lines of the ginbuna (offsprings from 3n ginbuna _??_).At the ripe egg stage, the majority of the oocytes contained metaphase nuclei derived from a single maturation division.Tripolar spindle formation at the first maturation division was not found in the present observation, contrary to the result in Carassius auratus gibelio by Cherfas (1966, 1972).
Based on the present observations, it is considered that the triploid lines of the ginbuna are unisexual and may make triploid egg cells throughout a single homoeotype division during maturation period.View full abstractDownload PDF (13537K) -
Ryoichi Arai, Kazuo Nagaiwa, Yukio Sawada1976 Volume 22 Issue 4 Pages 241-242
Published: March 31, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Yozaburo Sato1976 Volume 22 Issue 4 Pages 243-244
Published: March 31, 1976
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe yellow or white skin-flap was observed on the lower margin of the gill cover of Limanda yokoliamae.The flaps have various size and shape They are flattering in some and not so in others.Its function is not obvious, but may serve to lure small organisms near the mouth of the flounder.The similar structure was also observed in some other species of floundes.View full abstractDownload PDF (2481K)
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