巻号一覧
15 巻, 7 号
選択された号の論文の11件中1～11を表示しています
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土井 長之1949 年 15 巻 7 号 p. 301-305
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーThe Stock of Blue shark (Prionace glauca), whose age can not be estimated from scale or vertebral bone because of a cartilaginous fish, has been investigated statis ically from distribution curves of length and weight of fin measured at Tokyo Fish Market since October, 1947. Though size of samples, collected till June, 1948, is too small to obtain the survival rate exactly, it is approximately estimated at about 0.5-0.6.抄録全体を表示PDF形式でダウンロード (197K) -
土井 長之1949 年 15 巻 7 号 p. 306-310
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーThe age composition of fish Stock is considered to be expressed as ρχ, where ?? is age and ρ the survi al rate. Therefore logarithm of number of individuals (y) varies linearly with age (x). ρ equals 10b, where b is coefficent of linear regression. The estimated value of b is calculated from the scatter diagram of the sample by the following equation; ?? =co-variance/variance of χ. The significance and confidence interval of ?? can'be obtained by t-distribution.抄録全体を表示PDF形式でダウンロード (216K) -
花岡 資, 島津 忠秀1949 年 15 巻 7 号 p. 311-317
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーThe samples of Mactra sulcataria were caught at 6 regions, Hommoku, Urayasu, Goi, Banzu, Futtsu and Takeoka in Tokyo Bay, in the year of 1942 to '43, and we measured total weight (W), shell length (L), height (H) and breadth (B) to study morphometry and rate of growth. The results obtained are as follows.
1. Growth. Based on 2, 388 specimens, caught in 21 times in the duration of Sept. 5, 1942 to Oct. 20, 1943 at Urayasu, we found that they grow very rapidly shown as in Fig. 2.
2. Relation between W and L, H and B. As the results of measuring and statistical treatment the following equation was found to express it properly (Fig. 3 & Table 1). W=aKb, where K was calculated for L, H and B and a and b for each respective case. The ratio between L, H and B against W changes (Fig. 4), since the value of b varies in each case.
As to the growth of shells (Fig. 5) in general, the individuols with rapid growth (r) and those with retarded growth (r') are seen in the following relations: Lr' < Lr', Hr> Hr'and Br < Br'. In the light of these facts (Fig. 4 & 5) it seems that Urayasu is suitable to the growth of young Mactra and Futtsu to that of adult.
3. Formation of the marked rings. In the present species the marked rings were found to develope, in addition to other less distinct rings, in certain particular time of the year. It seems that these marked rings are formed when the natural environment-may be salinity, water temperature and other multiple factors-changes in a short period. However, it was seen that all individuals dwelling the same region grow the marked rings simaltaenously (see Fig. 6 and Table 2).抄録全体を表示PDF形式でダウンロード (328K) -
井上 明1949 年 15 巻 7 号 p. 318-322
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーDealing with a number of specimens of Leander serrifer Stimpson obtained monthly, an ecological study has done as to the following items: growth, and weight-length relationship of the shrimp; number of eggs produced by the female. The result taken is that the female grows fast during periods from April to May and from Nov. to Dec., the male from April to May. Breeding season ranges from July to early in October. Young appears from Oct. to Nov. Most of the mother females disappear after spawning, consequently it may be said that the animal in qusstion is of one age. The number of eggs attached to pleopods vary considerably with difference of size of mother shrimp. It is, on average, 330, 542 in the shrimps ranging 0.0-0.5g, 0.5-1.0g in weight respectively. The weight-length relationship of the female may be expressed as follows: W=0.00000886 L3.257, that of male similar to this.抄録全体を表示PDF形式でダウンロード (255K) -
高岡 道夫, 石原 義雄, 角谷 龍生, 小川 周三, 西野 一彦1949 年 15 巻 7 号 p. 323-326
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (223K) -
須山 三千三1949 年 15 巻 7 号 p. 327-331
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (234K) -
江草 周三1949 年 15 巻 7 号 p. 332-336
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーCell diameter of Skeletonema and Biddulphia occurring in A tsumi Bay were studied with special reference to their changes over seasonal range.
Results of the study are shown in Figs. 1, 2 and 3.
Considerations on the relationship between the cell diameter of these diatoms and some of the physical environmental factors, viz. temperature, specific gravity and viscosity of sea-water, have provided a view which, differing from that rendered by preceding authers (cf. Matsue, 1936. Wimpenny, 1936.), shows that planktonic diatoms do not tend to vary their forms and dimensions in accordance with the conditions of sea-water on the basis of adaptation of their floating activity to immedia e surroundings.抄録全体を表示PDF形式でダウンロード (361K) -
石川 安太郎1949 年 15 巻 7 号 p. 337-342
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーIn the previous paper, we reported that the proteolytic activity of the sperm whale pancreas was extremely poor, as compared with that of cattle's. But the fact is not generallised, since it was only one example. Furthermore it is not improbable that the enzyme was destroyed to some extent, because of warm season (October).
In the present paper, we repo ?? t the results of experiments, which carried out by using samples prepared from six sperm whales, in colder season (December).
The enzymatic activities of these pancreases were measured by means of the Pancreatin Test (Par. 6, Japan Pharmacopoeia), with the powdered pancreases dried by acetone, and with the soluions extracted from minced pancreases by 30% aeetone.
The results are as follows:
(1) These dried samples, as such, had no proteolytic action. But in case to these was added intestine powder (1/4 part of their wt.) of sperm whale and the mixture in water was allowed to stand at 40° for 30min. they digested 8.3-10 times casein of their wt.. The results from six samples were practically the same, thus, individual difference was scarcely noticed.
(2) On the other hand, samples, each of which consisted of minced pancreas and the same amounts of 30% acetone, were preserved over several monthes at room temp. and digesting powers of the supernatant liquid of the samples were measured from time to time. Thus the relation between their activation and preserving time was investigated.
At the start of the experiments, the digesting pewer of each sample showed large difference. But after about a month, the digesting powers of all samples with only one exception, reached to a definite value. The digesting power is shown with cc. numbers of the supernatant liquid sufficient to digest 0.01gr. of casein. At this case, the value reached to 1/100. The activities did not change even after about two monthes from the start. It is concluded from this value, that the dry substances of these samples are able to digest ca. 7 times casein of their wt., assuming that dry matter of the fresh pancreas is 25%.抄録全体を表示PDF形式でダウンロード (358K) -
元田 茂, 佐藤 重勝1949 年 15 巻 7 号 p. 343-353
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーThe stomachs of spring atka-fish caught with seine net at the fishing grounds around Rumo, Hokkaido, are principally distended with microcrustaceans, Calanus plumchus. In addition, some of the stomachs contain a considerable quantity of Euphausia lanei and herring eggs. However, at the latest period of the fishing season more diverse forms of diet are found in the stomachs. The fish aggregate in a crowd in order to feed on Calanus plumchrus when the latter is densely crowded into a patch. When the northerly curren prevails, Calanus is abundantly concentrated along the border line of the tidal current, and successful catch of atka-fish by seine net is expected under such circumstances.抄録全体を表示PDF形式でダウンロード (617K) -
(III)マクサ發芽體の後期成長に就て殖田 三郎, 片田 實1949 年 15 巻 7 号 p. 354-358
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリーThe germination and the initial debelopment af this alga have been reported by the authors in their previous papers. And ofterward they pursued the postembryonal stage of the alga by the cultures of the sporelings in laboratory and in natural condition at sea.
As a rule sporelings rise up vertically, and then secondary shoots sprout from the basal part of the main axia. In one case allmost all secondary shoots rise up erectly and they form an upright bush, in the other case all the lateral buds sprout horizontary and grow creeping stlons, emitting new upright buds and rhizoids (Fig. 2).
Young plants grow very slowly at the begining, from summer till winter, and then they begin to grow rapidly (Fig. 5).
The young plants are damaged by dense covering of another small algae or feeding of Gastropoda.抄録全体を表示PDF形式でダウンロード (1092K) -
片田 實1949 年 15 巻 7 号 p. 359-362
発行日: 1949/11/25
公開日: 2008/02/29
ジャーナル フリー1) The process of the germination of Gelidium Amansii Lmx. was studied by the indoor culture under the various conditions of water temperature, specific gravity of water (used for the cultivation) and wave-length of light.
2) The optimum temperature for the germination was about 25-26°C, above which the sporelings were unhealthy in general, while below which very healthy. (Table 1, )
3) The growth of the sporelings were observed in the sea-water with specific gravity as small as 1.0105. But the length of primary rhizoids was remarkably affected by specific gravity of the water. (Table 2, 3)
4) The growth was delayed by monochromatic light at the begining of the germination, while when the germination was a little advanced, blue-green light made it grow more rapidly and strongly than white light. (Fig. 1, 2)抄録全体を表示PDF形式でダウンロード (237K)
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