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Volume 5 (1956 - 1957･･･
- Issue 3-6 Pages 71-
- Issue 1-2 Pages 1-
Volume 5, Issue 1-2
Displaying 1-8 of 8 articles from this issue
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Masamitsu OSHIMA1956 Volume 5 Issue 1-2 Pages 1-11
Published: January 30, 1956
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSKuma River of the Kumamoto Prefecture is famous in producing “ayu, ” Plecoglossus altivelis, of good quality, due to the suitable environmental conditions. Quite recently, however, utilization of the stream for the sake of generation of electricity necessitated to erect the darn of 34 meter high at the down stream in order to construct water reservoir. The Prefectural Government started the works last year and the dam. which is not provided any fish ways has been completed on 10 th of December, 1954, shutting up completely the passway of the anadromous fishes especially.
Consequently, complains of fishermen and inhabitants of the upper streams opposing to the policy of the Government paying no attention for fish culture, especially to keep good name of Kuma River in “ayu” fishing, became furious. In order to solve this hard problems, viz, electricity nor fishing industry, authorities of the Government promissed to liberate large number of “ayu” fry in the upper streams per year, to meet the both ends.
This attempts has been fulfilled for the first time in the spring ot the present year since, fries of sea-run form caught at the estuary of Kuma River and other parts in Kiushu as well as dwarf land-locked form of the Lake Biwa and Ikeda being libertated in the main and branch streams of Kuma River.
In the present paper are shown morphological differences between sea-run form of “ayu, ” grown at the both sides of the dam; effect of suitable baits upon development of land-locked dwarf form of “ayu” originated in the Lake Ikeda ; distinction between sea-run form and land-locked form of “ayu” after fattening, from the stand-point of scale figurations, etc.View full abstractDownload PDF (15040K) -
Yoshitake SUZUKI1956 Volume 5 Issue 1-2 Pages 12-14
Published: January 30, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe scythe fish (Pseudogobio esocinus T. et S.) is a bottom-feeding fish and has very broad queer lips. The present report deals with the histological study of them. On the lips are found many granular processes in which numerous taste-buds can be observed. Although they are numerous in number, they are distributed mainly about the apex of each process and comparatively few in other places, becoming less and less until they are none at the bottom. Their shape and structure are nearly similar to that of barbels of the mud leach which have been reported to have a flask-like shape and slender sensory cells comparatively closely set by MIYADI (1929) and SATO (1936, 37), and also similar to that of the skin of Rita rita H. by AHSAN-UL-ISLAM (1951).
It may be inferred from above mentioned facts that the granular processes on the scythe fish lips play an important role when finding food.View full abstractDownload PDF (379K) -
Tamezo MORI1956 Volume 5 Issue 1-2 Pages 15-18
Published: January 30, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (677K) -
Nagao ASANO1956 Volume 5 Issue 1-2 Pages 19-51
Published: January 30, 1956
Released on J-STAGE: June 28, 2010
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Yoshiichi MATSUI, Sajiro MAKINO, Yoshio OJIMA1956 Volume 5 Issue 1-2 Pages 52-58
Published: January 30, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSWhen kept under a confined condition, the carp (Cyprinus carpio) and the funa (Carassius carassius) mate and can produce hybrids. Reciprocal crosses are also possible with similar results. The hybrids grow regularly with no observed anomalies in their developmental course. They rank intermediate between the parent species in several characters. The hybrid males are completely sterile. Their testes generally lack spermatogenetic activity. The chromosomes as observed in spermatogonial division are 99 in number, being the total sum of the haploid numbers of the parents, 52 for carp and 47 for the funa. Meiosis in the hybrid testes is highly disturbed, being arrested at early stages of the meiotic prophase. Most of germ cells undergo pycnotic degeneration during the period from late leptotene to pachytene, and no spermatozoa are produced. In some hybrid specimens, the gonads show mosaic structures composed of testicular and ovarian elements, an evidence suggesting that sterility is associated with intersexuality, caused by the genetic unbalance between the parents.View full abstractDownload PDF (1515K) -
[in Japanese]1956 Volume 5 Issue 1-2 Pages 59-60
Published: January 30, 1956
Released on J-STAGE: June 28, 2010
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Masao OKA, Tsuneo AOYAMA, Tadatoshi KAWASAKI1956 Volume 5 Issue 1-2 Pages 61-64
Published: January 30, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSOn October 23, 1954, the authors operated artificial insemination of Talus tuinifrons (TEMMINCK et SCHLEGEL) in the Sea of Goto, and observed the development of egg.
The egg is colorless, buoyant and spherical, measuring 0.9-0. 93 mm in diameter with an oil-globule measuring about 0.19 mm in diameter and coloured pink slightly.
The hatching takes place in about forty hours at the water temperature 23°C.
The newly hatched larva is 1.9 mm in total length, having two brown-yellow blotches on the head behind the eye and a large yellow blotch on the. tail. The largest diameter of the yolk is 1 mm. The oil-globule is situated in the rear end of the yolk.View full abstractDownload PDF (1992K) -
Keisuke MARUYAMA1956 Volume 5 Issue 1-2 Pages 65-69
Published: January 30, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAccording to SCHULTZ (1938), the fishes of the genus Argyropelecus Cocco represent 7 species throughout the world, and one species, A. sladeni REGAN, was found from of southern Japan. And according to MATSUBARA (1955) another species, A. hemigymnus Cocco is known from Myojinsho. But the other species seem not to have been recorded from Japanese waters.
Recently I have examined the specimens of deep-water fishes gathered by me, and found two additional species of this genus.
I am much obliged to Dr. T. ABE of the Tokai Regional Fishe ies Research Laboratory for the loan of his valuable reprints. I also wish to thank Mr. S. YAJIMA of the Tokai Regional Fisheries Research Labo a pry, who has given various facilities. Fu ther my thanks are due to Mr. M. WATANABE who has assisted me in photographing.View full abstractDownload PDF (2400K)
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