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Volume 7 (1938 - 1939･･･
- Issue 6 Pages 313-
- Issue 5 Pages 251-
- Issue 4 Pages 191-
- Issue 3 Pages 131-
- Issue 2 Pages 61-
- Issue 1 Pages 1-
Volume 7, Issue 6
Displaying 1-10 of 10 articles from this issue
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Yositada TAKENOUTI1939 Volume 7 Issue 6 Pages 313-315
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (168K) -
Ituo KUBO1939 Volume 7 Issue 6 Pages 316-318
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSSince the establishment of the genus Puerulus(4) by ORTMANN (1897), two species of this genus have been known from the Indo-Pacific region. Three specimens were obtained with “Naname-ami” (a gill-net for flat-fish) off Kominato, Prov. Bôsyû at a depth of about 170 fathoms and kindly placed at my disposal through the courtesy of Mr. Syûya NAKAMURA. They proved to represent a new species of this genus.
I wish to express my gratitude to Prof. A. TERAO for his kind supervision and to Mr. Syûya NAKAMURA for his favour of the valuable specimens.View full abstractDownload PDF (974K) -
V. The Relation berween the Weight of Sinkers and the Deformation of Amber-fish Nets Subjected to Various CurrentsHideaki MIYAMOTO1939 Volume 7 Issue 6 Pages 319-323
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSBy the same method as used in the previous reports, the deformation of amber-fish keddle net and trap net under the various currents was examined with two models, to the foot of which sinkers of various weight were attached so as to reduce deformation due to currents. The photographs reproduced in Figs. 5 and 6 show how the deformation of the two nets under various currents was reduced by the adjustment of the weight of sinkers.View full abstractDownload PDF (1888K) -
Gorô OKABE1939 Volume 7 Issue 6 Pages 324-326
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSCompositions of scads fished about Kominato Bay, Tiba Pref., Were investigated, with respect to each of groups, into which the inlividuals have been classified according to several kind ?? of fishing implements and as several localities inside and outside the bay.View full abstractDownload PDF (109K) -
Kiyohide MIYOSI1939 Volume 7 Issue 6 Pages 327-328
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSOncorhynchus keta (WALB.) caught at ten localities along the coast of Kamchatka can be classified into three of the four-fold groups obtainable, if the first and the second winter rings on the scale are each classified into two kinds with respect to their structure, as shown in the photographs reproduced in Fig. 2.View full abstractDownload PDF (730K) -
Mituyo OKADA1939 Volume 7 Issue 6 Pages 329-334
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSIn order to substitute the differential equation for one-dimensional refrigeration of fish with a system of equations in terms of finite differences, suitable to numerical calculations, special attention was paid to the change in temperature during the interval of time, in which the freezing commences layer by layer, from the outermost surface of fish exposed to the cooling medium to the interior parts. Suppose a plate-like flesh of fish is divided into layers of finite small thicknesses. If the temperature distribution is given at the instant, when the i-th layer begins to freeze, the equations obtained give the drop in temperature at each layer, as well as the time taken, till the next i+1-th layer begins to freeze.View full abstractDownload PDF (289K) -
Yosimiti MIYAMA, Masanori MATUMOTO, Tosiro ABE, Morizô TERUYAMA1939 Volume 7 Issue 6 Pages 335-338
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSVarious mixtures were obtained by mixing cotton seed oil with oleic acid, and solid fatty acid and higher unsaturated fatty acid, both of which had been separated from tuna oil, in varying proportion. Each mixture was put in a lacquered tuna can and underwent ordinary canning processes such as sealing, heating, etc. Two weeks afterwards each can was opened and the conditions of the inside varnish were examined. Of the mixtures, those which have acid value more than 2•5 always caused falling off of the varnish to some extent. But those with acid value less than 1•4 kept the varnish intact.View full abstractDownload PDF (1034K) -
Takayosi HASEGAWA1939 Volume 7 Issue 6 Pages 339-341
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe flesh cubes of Thunnus orientalis (T. & S.) of the same size were immersed each in 14•0 15•4, 17•9, 19•0, 21•6 and 25•2 percent pure salt solutions and kept at 20-25°C. Each time before and after curing, weight and water content of each cube were observed, and salt content was measured at intervals, as shown in Figs. 1-4 and Table 1. The penetration of salt into the cubes was indicated by an empirical formula:-
q=Q1(1-e-a1t)+Q2(1-e-a2t), Q=Q1+Q2,
where Q is concentration of brines, q salt concentration in the tunny cube at time t, and α1, and α2 are coefficients. These results are shown in Figs. 5-6 and Table 2.View full abstractDownload PDF (164K) -
Tikayosi MATUDAIRA1939 Volume 7 Issue 6 Pages 342-344
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSAccording to F. FRITZ (1935) the sinking of some plankton is acceralated by the death of its cells, while it is the established fact that suspensoids such as blood corpuscles in the fluid, muddy particles in the water etc. settle down by the addition of minute quantity of salts. The author studied the mechanism of the sinking of phytoplankton, Scenedesmus obliquus, and directed his attention to the effect of metallic salts upon the sinking. The result is shown in Tables 1 and 2, and Fig. 1.View full abstractDownload PDF (192K) -
Rinzô TANAKA1939 Volume 7 Issue 6 Pages 345-357
Published: March 15, 1939
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSAs the material of experiments the author has chosen Salmo irideus GIBBONS and Oncorhynchus masou (BREVOORT). The first method adopted was to select a parent fish and keep it for several hours or several days in a weak solution of lactic acid (0•0025-0•015%) or of soda (0•15-0•3%). Subsequently, taking the female or male generative matter out of it, the normal male or female generative matter was matched, as follows:- ?? (acid)× ?? (normal); ?? (acid)× ?? (acid); ?? (normal)× ?? (acid); ?? (soda)× ?? (normal); ?? (soda)× ?? (soda); ?? (normal× ?? sodia); ?? (acid)× ?? (soda); ?? (soda)× ?? (acid). The second method was that, at the time of fertilization, the female or male generative matter was soaked in a solution of acid (lactic acid 0•005-0•1%) or of alkali (soda 1-2%) for 17-50 seconds, and then the normal male or female generative matter was matched with it in the 8 different combinations as above referred to.
In the above experiments the author has, for convenience' sake, termed the cases of ?? (acid)× ?? (normal), ?? (normal)× ?? (acid), and ?? (acid)× ?? (acid) the acid participation; ?? (soda)× ?? (normal), ?? (normal)× ?? (soda), and ?? (soda)× ?? (soda) the alkaline participation, and ?? (soda)× ?? (acid) and ??(acid)× ?? (soda) the inter-acid and alkaline participation.
The result of the above experiments is summarized hereunder:-
(1) In 19 cases of regular fertilization experiments, excess of male over female always occurred, the sex ratio of 4, 348 fry being on the average ?? 48•4% to ?? 51•6%.
(2) In various kinds of fertilization experiments, in which the acid solution participated, the influence brought to bear upon the newly-hatched fry was generally in favour of the female fry. Out of 48 cases, those scoring over 50% of female fry were 35, and the average sex ratio of 13, 268 fry was ?? 50•9% to ?? 49•1%.
(3) In various kinds of fertilization experiments, in which the alkaline solution participated, the influence upon the fry was generally in favour of male ones. In 47 cases of experiments, those scoring below 50% of female fry were 43, and the sex ratio of the 10, 779 fry was ?? 46•4% to ?? 53•6%, showing a remarkable excess of male over the other sex.
(4) In 16 cases of fertilization experiments, in which the inter-acid and alkaline solution participated, the influence was in favour of the male sex, as will be instanced by the fact that out of the 16 cases there were only 6 cases which scored over 50% for the female fry. It was further shown that in the 3, 416 fry the average sex ratio was ?? 47•5% to ?? 52•5%, male fry being far in excess of the female ones.View full abstractDownload PDF (1783K)
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