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Volume 21, Issue 4
Displaying 1-11 of 11 articles from this issue
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Tetsushi Senta1975 Volume 21 Issue 4 Pages 175-182
Published: March 15, 1975
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESST.cristatus, which has not been reported since Klunzinger (1884) first recorded the fish from the Red Sea, commonly occurs in the South China Sea and the Straits of Malacca.A developed cranial crest characterizes the fish.Other taxonomically important characters are: caudal absent, dorsal spines 5, pyloric caeca 11-13, vertebrae on trunk 45-48, pectoral fins short not reaching lateral line, ventral fins situated below 9-12th dorsal ray, anal origin below 47-50th dorsal ray, 2nd infraorbital present.The biological minimum size seems to be around 30 cm in total length.Small fishes constitute a main food category of the species, followed by small-sized crustaceans and squids.View full abstractDownload PDF (1375K) -
Keikichi Hamada1975 Volume 21 Issue 4 Pages 183-190
Published: March 15, 1975
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA histological examination of the thyroid glands of the threespine stickleback was carried out through various stages from the fry just hatched to the young kept for 110 days.The glands were highly active as judged from the histological criterion in the juveniles kept for about 20 days in freshwater.The juveniles survived in sea water began to have deposited guanine in the skin.In freshwater, the epithelial wall of the thyroid in the stickleback at the age of one month was irregular in shape and folded up irregularly.Then the fish which were transferred into sea water developed a heavy coat of guanine crystals.The thyroid follicles of the specimens kept continuously in freshwater beyond one month or more were excessively enlarged, and the interstitial connective tissue had markedly decreased in amount.Nucleus -like bodies and colloid-like droplets were often found in the granulated and eosinophilic colloid of the follicular lumen.The colloid-like droplets were stained pink with eosin and orange or brownish orange with Mallory's triple stain.Although small follicles were scattered in the branchial arch, the larger follicles were united with one another.
When the fish were transferred into sea water, a spontaneous involution of the enlarged thyroid occured.View full abstractDownload PDF (17651K) -
Fumio Kato1975 Volume 21 Issue 4 Pages 191-197
Published: March 15, 1975
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSIt was concluded that the salmonid fish found in Ise Bay, the Inland Sea, Tokai district, Kinki district, and Shikoku district (Figs.1-2, Table 1) is the sea-run form of“Amago”, Oncorhynchus rhodurus Jordan and McGregor which is widely distributed in the freshwater of southwestern Japan.It was shown that the sea-run form is morphologically different from the salmonid fish“Biwamasu”in Biwa Lake which has been considered to be conspecific with O.rhodurus.View full abstractDownload PDF (6535K) -
Keizou Takeda1975 Volume 21 Issue 4 Pages 198-202
Published: March 15, 1975
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSIn Onaga-tani (Fig.1.B) and Sutani River (Fig.1.C) in the upper reaches of Ane River and Echi River of Lake Biwa water system, the author collected specimens which seem to be the char, Salvelinus leucomaenis having zigzag marks, instead of parr-marks, on their body side.Since such specimens are not known, the author describes their form (Table 1), localities, and habitats.
Specimens with atypical color patterns may be variation of Salvelinus leucomaenis (Pallas), and not hybrids between other salmonids and the char.Japanese name “6 nagaremon -iwana” is proposed for these variants.View full abstractDownload PDF (5313K) -
Shigeharu Kudo, Dan Kurosawa, Issei Kunimine, Kunihiro Nobusawa, Shige ...1975 Volume 21 Issue 4 Pages 203-212
Published: March 15, 1975
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSUltrastructure of IPN virus, a pathogen of the fingerling rainbow trout (Salmo gairdneri Richardson), was examined by the ultracvtochemical techniaues.
Mature virions are unenveloped and hexagonal or round in profile, having an average diameter of approximately 66 mμ (size range of 65-68 mμ) after phosphotungstic acid (PTA) or ethanol-phosphotungstic acid (E-PTA) staining technique.These techniques revealed that five capsomeres were sharply present on a capsid edge of the hexagonal virions on the ultrathin sections, suggesting that the IPN virus capsid is made up of 162 capsomeres.Probably, IPN virus may be unenveloped icosahedra and a member of the reovirus group.The capsomeres are often penta-or hexa-gonal on the ultrathin sections, and at each apex small units with an average diameter of approximately 21Å.are located.
PTA, E-PTA, ruthenium red, and lanthanum staining techniques revealed a positive reaction on the capsomeres of IPN virus, suggesting the presence of polysaccharides. The ruthenium red staining technique was applied to penetrate into small pancreatic tissue by means of mechanical damage.Further, PTA and E-PTA staining techniques revealed fine particles with the positive reaction on the outer surface and in the interior of tubular structures (or rod-like bodies) often located near the virions of various numbers.
Among IPN virions within cytolysomes small particles with an average diameter of approximately 210A appeared often singly or in beads-like chains.They consisted of a group of a few capsomeres and appeared penta-or hexagonal in profile.It is not clear what is the meaning of small particles.View full abstractDownload PDF (22056K) -
Susumu Umeda, Akira Ochiai1975 Volume 21 Issue 4 Pages 213-219
Published: March 15, 1975
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSTo obtain fundamental information on the early critical period of larvae of the yellowtail, Seriola quinqueradiata, they were reared in the laboratory tanks during 10 days after hatching, with or without food.In the larvae of the starved group, the digestive organs were normal in histological structure and digestive function on 4th day, but strikingly degenerated on 6th to 9th day after hatching.It is interesting that larvae of the fed group receiving rotifers (3-5individuals per ml sea water) as food from 4th day are classified into 3 types: the starved-, semistarved-and normally feeding types.Larvae of the starved type possessed the same histological features as the larvae of starved group.The semistarved type had histologically normal digestive tract, but sotifers were not seen in the intestinal lumen.Starved larvae were 70% and the semistarved type were 0% at 6th day, 46% and 27% at 7th day, 5% and 39% at 9th day, respectively.This suggests that the unfavorable feeding condition in the early period, 4th-6th day after hatching, appears to be a main cause of the intensive death for the yellowtail larvae reared in the laboratory tanks.View full abstractDownload PDF (6279K) -
Yoshinobu Konishi, Nobuhiko Taniguchi1975 Volume 21 Issue 4 Pages 220-222
Published: March 15, 1975
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
John E. Randall1975 Volume 21 Issue 4 Pages 223-226
Published: March 15, 1975
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Prince Akihito, Katsusuke Meguro1975 Volume 21 Issue 4 Pages 227-230
Published: March 15, 1975
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSThe following three species of the genus Glossogobius have been recorded from Japan: G.olivaceus (Temminck and Schlegel), G.biocellatus (Valenciennes) and G.giuris (Hamilton). Three specimens of the fourth species which well agree with the syntypes of Gobius celebius Valenciennes (Fig.4) have been collected in Iriomotejima (Fig.1).They were compared with nine specimens of G.celebius from Australia and the Philippines and twenty two specimens of G.giuris.It was found that G.celebius can be distinguished from G.giuris by the number of predorsal scales (13-15 in G.celebius and 17-22 in G.giuris);the number of spines on the gill-raker (4 and 12 on the fifth from the uppermost gill-raker on the lower limb in two specimens of G.celebius;0 and 1 in six specimens of G.giuris);eye diameter (6.6-9.2%, mean 8.0%, of standard length in twelve speci mens of G.celebius;3.8-6.4%, mean 5.0%, in twelve specimens of G.giuris);the two small additional pores between G and H on the oculo scapular sensory canal (Fig.3A);and the uniserial pit organ lines without a group of short pit organ lines on the lower part of the opercle (Fig.3A).View full abstractDownload PDF (2694K) -
Prince Akihito, Katsusuke Meguro1975 Volume 21 Issue 4 Pages 231-232
Published: March 15, 1975
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSFive specimens of Cryptocentroides insignis (Seale) collected from Ishigakijima, Okinawa Prefecture are described here with a new Japanese name, “hasujimahaze”.The specimens examined well agree with the, description and the figure by Seale (1910: 116, pl.2, fig.1) and the description by Herre (1927: 234).View full abstractDownload PDF (3118K) -
Kiyoshi Mauyama, Kenji Ono1975 Volume 21 Issue 4 Pages 233-234
Published: March 15, 1975
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThree specimens of Ectreposebastes imus Garman were collected from off Kamaishi (dept 710-895 m) Iwate Prefecture, Japan.These specimens have some characters which fall outside of ranges of variations reported by Eschmeyer and Collette (1966).Previously this species was reported only wice from Japan: one specimen from off Kesennuma, Miyagi Prefecture and one from Suruga Bay, off Heta, Shizuoka Prefecture.View full abstractDownload PDF (1944K)
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