日本水産学会誌
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ISSN-L : 0021-5392
1 巻, 1 号
選択された号の論文の7件中1~7を表示しています
  • 木村 喜之助
    1932 年 1 巻 1 号 p. 1-4
    発行日: 1932/06/15
    公開日: 2008/02/29
    ジャーナル フリー
    No investigation has been made on the scale and otolith of the tuna from the Seas of Japan with reference to the growth rate of the fish. In the present paper are given frequency histograms (Figs. 2 and 5) showing body-weight distribution of bluefin tuna (Thunnus orientalis Temminck & Schlegel) and yellowfin tuna (Neothunnus macropterns Temminck & Schlegel) from Sigedera fishing ground which is situated at north-eastern corner of the Suruga Bay (Fig. 1). The data were obtained from 1924 to 1931 inclusive, and can be divided into several age-groups as plotted in Figs. 4 and 6, in which solid circle indicates individual fluctuation of the body-weight and encircled dot shows the average body-weight of a large number of specimens which were caught there at the same time and nearly of the same weight. The curves are free-hand smoothing.
  • 島田 清, 木俣 正夫
    1932 年 1 巻 1 号 p. 5-6
    発行日: 1932/06/15
    公開日: 2008/02/29
    ジャーナル フリー
    It is customary to determine chlorine by the titration with silver nitrate, but it is almost impossible to find out the element in the tissues of organisms or in culture media by this method. The present paper embodies our determination of small amount of chlorine by a nephelometric method, chlorine being measured as silver chloride hereby.
    Experiment 1
    A varying amount of N/50000 NaCl solution was first acidified with HNO3, 0.2 c.c. of 10% AgNO3 solution was added, and finally distilled water was put to make the mixture 30 c.c. in volume. The chlorine content of this series of the mixtures was determined by a nephelometer in reference to a standard solution which consists of 20 c.c. of N/50000 NaCl solution, 0.2 c.c. of 10% AgNO3, solution, and 3 c.c. of HNO3. It may be mentioned that I c.c. of N/50000 NaCl solution contains 0.0007 mgr. of Cl.
    It is clear from the experiment that chlorine was almost exactly determined in the series within the range from 0.008 to 0.018mgr., the experimental error being ±0.001mgr.
    Experiment 2
    Firstly, 1 c.c. of a broth diluted to ten times was made 100 c.c. in volume with distilled water. Secondly, 1 c.c. of the broth diluted to ten times was mixed with 5 c.c. of N/2000 NaCl solution and then distilled water was added until 100 c.c. Two c.c. and 3 c.c. of each of these two solutions were acidified with HNO3, mixed with 0.2 c.c. of 10% AgNO3 solution, and made 30 c.c. with distilled water. The nephelometric determination of the samples was done with the satisfactory results
  • 大谷 武夫, 川口 武男
    1932 年 1 巻 1 号 p. 7-10
    発行日: 1932/06/15
    公開日: 2008/02/29
    ジャーナル フリー
    The production of SH2 from muscles by heating is of great importance for canning industry, especially in connexion with blackening of canned crabs, shrimps, clams, etc.
    The present paper deals with the relation between Ph values of the medium and production of SH2 from muscle of a crab, Portunus trituberculatus, by heating. Fresh muscle of the crab was heated in buffer solutions of different Ph values at 100°C for two hours, and the amount of SH2 thus produced was measured with p-amino-dimethylaniline, SH2-production from the material having been practically exhausted in 1-2 hours as shown in Table 1.
    Table 1
    Table 2 tabulates the results of our experiments.
    Table 2
    The results are summarised as follows:-
    1. The amount of SH, produced from the muscles of Portunus trituberculatus by heating at 100°C in media of different Ph-values was measured.
    2. The production of SH2 from the material is almost exhausted in two hours's heating.
    3. The greater Ph-value of the medium, the more the amount of SH2 produced by heating. At Ph 6.5 SH2 produced very slightly.
    4. The muscle of female carb produces SH2 more than that of male under the same experimental conditions.
  • 鐵本 總吾
    1932 年 1 巻 1 号 p. 11-17
    発行日: 1932/06/15
    公開日: 2008/02/29
    ジャーナル フリー
    The present communication deals with the sterilising action of mineral acids on Proteus vulgaris, Staphylococcus pyogenes aureus, Bac typhosus, and Vibrio cholerae. The results are summarized as follows:-
    (1) Sterilising action of strong mineral acids, HNO8, HCI, H2S04, and H3PO4, is determined by pH values of each solution, and has no relation with the kind of the acids.
    (2) Anions of the four strong mineral acids have no sterilising action
    (3) Sterilising action of chromic acid, HCNO, and osmic acid is mostly due to the action of acid molecules themselves.
    (4) Sterilising action of boric acid is chiefly due to pH values, but its degree is very slight.
  • 田内 森三郎, 三善 清旭
    1932 年 1 巻 1 号 p. 18-24
    発行日: 1932/06/15
    公開日: 2008/02/29
    ジャーナル フリー
    Using model fish-ways and some kinds of fishes, we studied the rate of ascent and obtained the following results.
    (1) The distribution of fishes in fish-ways is represented by the next formula (1): nk ?? ak, ……………………………………… (1) where nk is the number of fishes in the kth compartment of fish-way and a is a constant.
    (2) The percentage, pv, of the number of fishes which reach the top of a fish-way having v compartments in unit time is represented by the next equation (2): pv=p1av-1, …………………………………… (2) where p1 is the percentage of fishes which enter the first compartment of fish-way in unit time.
    (3) The temperature of water has a great influence upon the rate of ascent.
    (4) The slope of fish-way has a great influence upon the rate of ascent, and the rate of ascent decreases as the slope of fish-way increases.
    (5) The rate of ascent depends upon the ratio of size of fish to level-difference in adjacent two compartments.
    (6) The rate of ascent has a maxium value at a definite value of quantity of flow, and the quantity of flow giving the maximum rate of ascent much differs with the form of partition wall.
  • 吉田 裕
    1932 年 1 巻 1 号 p. 25-27
    発行日: 1932/06/15
    公開日: 2008/02/29
    ジャーナル フリー
    Chanos cans (Forskål) is one of the most available fish for cultivation in Formosa and Philippine districts. Very little is known about the breeding habits of this fish in Formosa. The distribution of the fry, about 12 to 26mm. in total length, found along sandy coasts, has been reported by previous authors as far northward as to Sou-Wan on the east coast and to Tansui on the west coast in Formosa.
    The specimen here described is a post-larva of 14.0mm. in total length, obtained from the Amami-Oshima which is north to the Riu-Kiu Islands. This specimen corresponds to the description of the fry of Chanos chanos from the Java Sea by H. Delsman (1929). I introduce here that the northern limit of the distribution of this fry is farther northward to the Amami-Ohima than ever has been known.
  • 殖田 三郎
    1932 年 1 巻 1 号 p. 28-32
    発行日: 1932/06/15
    公開日: 2008/02/29
    ジャーナル フリー
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