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Volume 1, Issue 4
Displaying 1-7 of 7 articles from this issue
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Sumio MINAMORI1951 Volume 1 Issue 4 Pages 215-225
Published: February 28, 1951
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESS1) Morphological and ecological differences amongtwelve local races of spinous loaches from western Japan were described.
2) More than seventeen kinds of hybfids were produced among eleven local races collected from eight rivers and one lake.
3) When the local races were classified according to IKEDA's opinion, the males and females of all interspecific and intersubspecific hybrids were almost completely sterile. A simlar sterility was also found among some intrasubspecific hybrids.
4) From the standpoint of the physiological isolation, the Japanese spinous loaches may be divided into several species, differing from the classification by IKEDA.View full abstractDownload PDF (1949K) -
Hisao KOBAYASI1951 Volume 1 Issue 4 Pages 226-237
Published: February 28, 1951
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSI am pursuing the comparative studies of scale character in fresh-water fishes and some marine fishes in East Asia. In the course of these studies, I have found that scale character shows definitely a certain affinity, at least, between genera, families, or larger groups, apart from the small problem of its indication of the characteristics of the grou3 to which a fish belongs and of its reference to species. This has l-s me to study the affinity between fresh-water fishes in4 Japan and their near related ones in the adjacent continent.View full abstractDownload PDF (2499K) -
Reizo ISHIYAMA1951 Volume 1 Issue 4 Pages 238-250
Published: February 28, 1951
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn the present paper the writer gave a detailed analysis and comparison of the bones, especially of the cranium and some of the visceral skeletons in 5 species of the Japanese mugilid-fishes referred to three genera, Mugil, Liza and Chelon. By this study it was found that the osteological characters provide more clear specific and generic criteria and also more reliable indication of phyletic relation than the older schemes which based essentially on the external features.
In determining the relationship of the genera one another, the following characteristics are especially taken into consideration ; 1) presence or absence, and degree of differentiation, if present, of the basisphenoid;2) shape and degree of developement of parasphenoid, especially in the middle and posterior portions; 3) with or without the posterior opening of myodome; 4) presence or absence, and shape, if present, of the basioccipital process; 5) presence or adsence of elongated posterior-zygapophysis of the second vertebra; 6) form of the urohyal; 7) configulation of the post-temporal; 8) form of ethmoid region: and 9) form of preorbital.
The diversities of these organs have been simply divided into two categor-iies, viz, plus and minus, in each element, (Table 1 and 2). As indicated in these tables, the genus Chelon is, as a whole, most undifferentiated representative of the mugilids, although this fish having the remarkable basioccipital processes and peculiar shape of premaxillary. The genus Mugil is unquestionably more differentiated than the others in lacking both the basi-sphenoid and the posterior opening of the myodome, in having well developed parasphenoid and ethmoid, a pair of long posterior projection of urohyal, and three remarkable articular processes on post-temporal.
The genus Liza also more specialized than the genus Chelon at least in having peculiarly elongated posterior-zygapophysis in second vertebra, well developed ethmoid, three articular process on post-temporal, and in lacking the posterior opening in myodome, although premaxillary less developed than in the latter.
It is interesting to note that the genus Chelon, despite mostly generalized in the mugilid-fishes, provided with a few remarkably specialized characters as aforementioned. Is it not very reasonable, therefore, to think that the genus Chelon is rooted very deep in phylogeny within this group?View full abstractDownload PDF (1850K) -
Kiyomatsu MATSUBARA, Akira OCHIA1951 Volume 1 Issue 4 Pages 251-259
Published: February 28, 1951
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSIn 1938, MATSUBARA made a statistical observation based upon 44 specimens belonging to the genus Synaphobranchus taken in Japanese waters, and suggested that the group of the genus represents a single species, Synaphobranchus pinnatus (GRONOW). In that study, however, he did not touch upon the vertebral counts.
On the other hand, BRUUN (1937) and NORMAN and TREWAVAS (1939) did really sound and comprehensive research in the taxonomy of this group.BRUUN classified the larval form of this group into several species besed upon the differences in counts of myotomes. NORMAN and TREWAVAS reexamined all the types of this group either directly or indirectly and classified them into i. number of species mainly based upon the differences in counts of vertebrae and the general forms of the scales on sides of body.
We have had of late an opportunity to examine 60 specimens of this group taken in various parts of Japan and have found that the specimens used in his previous study by MATSUBARA (1938) agree well with S. kaupii JOHNSON and that our present specimens can be distinguished into three species, S. kaupii JOHNSON, S. affinis GÜNTHER and S. brevido-rsalis GÜNTHER respectively, mainly by the differences in counts of vertebrae and general forms of both scales and upper pharyngeal teeth.View full abstractDownload PDF (1515K) -
Hiroshi YABE1951 Volume 1 Issue 4 Pages 260-263
Published: February 28, 1951
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSConcerning the larva of the swordfish, Lütken (1880) described them of about 35 mm found in the Atlantic Ocean, but there is no report on the existence in the neighbouring seas of Japan. The author caught three larvae of total length 11.0-27.4 mm in Kuroshio Region (the ocean current sweeping the southern coast of Japan) in May, 1949 and March, 1950. In this report their external appearance is described, and it is stated that they are similar to the adult of Istiophoridae except that they have no ventral fin in the larval stage.View full abstractDownload PDF (753K) -
Hiroshi NAKAMURA, Tadao KAMIMURA, Yoichi YABUTA, Akira SUDA, Shoji UEY ...1951 Volume 1 Issue 4 Pages 264-271
Published: February 28, 1951
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1666K) -
With some additions to the previous reports of the present seriesTokiharu Abe1951 Volume 1 Issue 4 Pages 272-283
Published: February 28, 1951
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSDownload PDF (2215K)
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