巻号一覧
21 巻, 9 号
選択された号の論文の17件中1～17を表示しています
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谷口 武夫1956 年 21 巻 9 号 p. 969-972
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーIn order to study how the difference of the area at the opening of a cod end affects on the resistance of the net, the author deduced a theoretical relation between R/(KSn) and x2/S for various pyramid type cod ends of which the area at the opening is changed when another resistance-factores are maintained constant (Eq. II-3). Where R denotes the total resistance of the cod end, K the resistance of the unit area of plane net fixed at right angle to the stream, Sn the total area of webbing, S the area at the opening and x the total length of the cod end.
Further, the author made series of experiments on the model net of cod ends of which the area of the opening are 162cm2., 200, 224, 392 and 578, and compared experimental results with the results calculated by the Eq. II-3 and is plotted in Fig. 11, from which the author make sure of the following fact:
In regard to the cod ends which are very short as compared with the area at the opening (e.i. 0<x2/S<5), the resistance is affected by the change of the area at the opening (e.i. the resistance decrease to about half of the resistance of the cod end which is zero in x2/S), but in regard to the cod ends which are moderately slender as are used in fractical trawl net (e.i. 5<x2/S<30), the resistance is hardly affected by the change of the area at the opening.抄録全体を表示PDF形式でダウンロード (223K) -
草間 秀俊, 近藤 仁, 鈴木 誠1956 年 21 巻 9 号 p. 973-974
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーThe most reasonable design of fishing nets is to obtain the average stress in the part. To design and operate and fishing nets, it is important to know the feature of the stress distributiion by various kinds of loading. In this experiment, we tried to take measure of the stresses which are propagated to all parts of the nets by using the strain gauge as shown in Fig. 1, when a concentrated load acts at the center of the net which was stretched by the circular ring (3 meters diameter).
From this experiment, the results obtained are as follows.
1. We know that the method by using the srain gauge can be applied to measure the stress.
2. The fundamental form of stress is nearly diamond shape as shown in Fig. 2.抄録全体を表示PDF形式でダウンロード (145K) -
草間 秀俊, 山口 芳男, 宮崎 芳夫1956 年 21 巻 9 号 p. 975-977
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーThe hauling machines of the fishing nets or lines are necessary to have the characteristics of shock absorb and reliable controle of the hauling speed, especially for the large ships of tuna fishing. However, none of old types have these two important characteristics.
The authors intended to reject these defects by the application of torque converter, and carried out the trial production.
By the experiments, we obtained as follows;
1. The charactersistics of the shock absorb and self control of hauling speed, can be obtained.
2. The considerable amount of temperature increasing of the casing occurs by the rotation of the rotors.抄録全体を表示PDF形式でダウンロード (230K) -
朴 龍俊1956 年 21 巻 9 号 p. 978-981
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーA series of experiments on a model of saury blanket net (Bôuke-Ami), the scale of which was reduced to 1/52 to the full scale according to TAUTI S principle, were made for the purpose of study the sweeping volume of the net and variations of the shape in the course of lifting when the weight of sinkers, their position, and lifting speed were varied in a still water. The float line of the net was supported by a bamboo float which was fixed at a definite position of water surface by two outriggers, then the lead line was pulled up by the lifting lines. Stroboscopic photographs of lifting movement of the net are shown in Plate 1.
According to the results obtained, the sweeping volume of the net seems to be larger with the weight of sinkers, when the lifting speed is kept constan ??, and to be larger with the lifting time when the weight of sinkers and its position are not altered, while the obvious diffrence due to the position of sinkers can not be recognized.抄録全体を表示PDF形式でダウンロード (1164K) -
羽生 功, 田村 保, 雨宮 育作, 二村 一雄, 藤木 進, 吉田 徳靱1956 年 21 巻 9 号 p. 982-990
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーAccording to the study on the deep-sea drag-net fishery which was operated in the depth of 100-500m of the Seas of Kumano and Ensyu already exploited grounds, the following results were obtained (1) The fishing effort of this fishery had increased rapidly after the period of reduced fishing in the wartime and then has become almost constant since 1949. 2) The average daily catch per boat, however, had decreased considerablly as the fishing effort had increased and became almost constant in the three years (Sep. 1951-May 1954).
The results of the re??earches carried out in a new ground off Tokusima and Wakayama Prefecture from Mar. 1953 to Feb. 1954 showed that the species of the catches were all the same to those of the old grounds and the the average daily catch per boat of the new ground was much superier to that of the old grounds at present and even superior to that of the old grounds soon after the war.
Supposing that the average production per unit a??ea in the new ground is equal to that in the old ones, the number of the boats to be admited to the fishing in the new ground may be estimated at 40-46, with the aid of the extents of the new and old grounds and the number of the boats in the old ground, where the equilibrium between the fishery and its stock is supposed to be established, since both the fishing effort and the average catch are almost constant in the three years.抄録全体を表示PDF形式でダウンロード (702K) -
羽生 功1956 年 21 巻 9 号 p. 991-999
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーThe life history of the argentine, one of the most important fish of the deep-sea drag-net fishery, is little known yet. The present writer deals with the age and growth of the fish. Having examined the specimens taken from either Kumano-Nada, a well exploited ground, or off Kii-Suido, an almost untouched ground, he obtained the following results.
1) Left-side and right-side otoliths are symmetrical in every detail.
2) The 1st ring or clear band in the otolith is formed rather regularly in winter, while the 2nd ring formation in the same season is apparently not quite regular; the opaque growth zone outside the 2nd ring is usually indistinct.
3) The diameters of the 1st and 2nd rings are 2-5mm and 5-6mm respectively and their ranges hardly overlap each other.
4) Sometimes a pseudo-ring is formed, but it can be distinguished by its weak formation and its diameter.
5) By virtue of the above facts age determination by otolith is possible and growth can be traced. Argentine grows rapidly for several months after hatching, followed by later slower growth, and attains 130-150mm by the end of the 1st year, and 170-190mm by the end of the 2nd year. Since those fish which have more than one ring are few, it may be probable that the life span of the argentine is chiefly between one and two years.抄録全体を表示PDF形式でダウンロード (1266K) -
村上 子郎, 早野 孝教1956 年 21 巻 9 号 p. 1000-1006
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリー1. The interneural spines of the mackerels from Japanese waters which are counted from a to b in Fig. 1 vary from twelve to twenty-three in number. The number frequency distribution of them is distinctly bimodal (Fig. 2 and Table 1). Accordingly, the present fish are divided into two groups by the number of interneural spines, one bearing the spines less than sixteen, while the other, more than seventeen.
2. In the group which bears the interneural spines less than sixteen, the spots on the lateral median line are non, or if present, some of them are in contact with each other or with the coloured band on the dorsal side of body. While in the other group which bears them above seventeen, such spots are distinct and independent (Fig. 3 and Table 4). Judging from the characters of spots, the former corresponds to Pneumatophorus japonicus, while the latter to P. tapeinocephalus.
3. The relation between the number of interneural spines and that of spinous rays of 1 ?? dorsal fin shows that it is inadequate to divide the mackerels into two species by the latter, namely to treat those which bear nine or ten spinous rays as P. japonicus and those which bear eleven or twelve ones as P. tapeinocephalus (Table 5-7).抄録全体を表示PDF形式でダウンロード (1063K) -
マイワシの生長曲線について吉田 陽一1956 年 21 巻 9 号 p. 1007-1010
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーPrevious investigations have shown that the quantity of the plankton fed by the sardine is nearly proportional to the square of body length and that the straining velocity for plankton is proportional to the surface of the gill-rakers of the sardine. In this paper, using these results and assuming that the sardine follows the proportional growth, I tried to obtain the growth curve of the sardine.
Since the energy e1 taken by the sardine is proportional to surface, if the energy consumed by Maintenance Metabolism (e2), Work Metabolism (e3) and Reproduction Metabolism (e4), except Growth Metabolism (e5), is proportional to weight, or is divided into two parts, viz. one is proportional to surface and the other to weight, the change of the body weight w of the sardine is given by:
dw/dt=e5/δ=1/δ(e1-e2-e3-e4)=1/δ(βw2/3-γw).
In words : e is the taken or consumed quantity per unit time of the free energy which is used by the sardine; δ is the energy per unit weight used for construction of the increased portion of body, and δ=e5/w', when w' is the increased weight per unit time of body; δ, β and γ are constants.
Therefore, I could obtain “Exponential-type Curve” as the linear growth curve and “Sigmoid Curve” as the weight growth curve. Although these formulae have been proposed by BERTALANFFY trying to establish relations between growth and total metabolism, there are some differences in the interpretation. For instance, I have used the free energy as indicator, by introduction of the conception of δ, as mentioned above.抄録全体を表示PDF形式でダウンロード (264K) -
本間 義治1956 年 21 巻 9 号 p. 1011-1015
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーIn this report the writer described on the remarkable thyroid gland of the tuna, Thunnus thynnus (LINNÉ). They pos ?? large, compact masses of thyroid gland, which can be removed easily free from the other tissues and organs.
1. The thyroid of the tuna extends on the bifurcated region of the 1st and the 2nd afferent branchial arteries. These soft masses are consisted of a anterior small lobe and a posterior large one, and their coloration are dark orange or dark reddish brown.
2. Ratio of fresh wet weight of the tuna thyroid 1kg. of body weight, is 29.19mg, aceton dry weight is 5.01mg, and also anterior ?? ote/posterior lobe is 16.72/83.28.
3. The histological observation of the tuna thyroid showed similarity to the organs of higher vertebrates rather than that of the other common teleosts. The small number of giant follicles (400-700 μ in size) uniformly scattered in the ground of common follicles (about 100 μ), In some places the nearly spherical follicles were grouped and they showed a figare of obvious hyperactivity with very high columnar epithelial cells.
4. In the epithelium of exhausted or spent follicles the homogeneous wedge-form substances were observed here and there, however they were perceived in the anterior lobe only in the specimen fixed by Boum's solution. The writer thought that this substances are not described yet in other vertebrate thyroid. They are deeply stained by haematoxylin, negative to Fe ?? lgen's reaction, and not like to Golgi's apparatus or mitochondria. This undecided substances may be artefact produced by RNA referable substances, further investigation will be continued.抄録全体を表示PDF形式でダウンロード (1279K) -
本間 義治1956 年 21 巻 9 号 p. 1016-1018
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーIn the present paper the writer reported on the thyroid gland of the sailfish, Histiophorus orientalis (TEMMINCK et SCHLEGEL). They have a large, discre ?? e compact masses of thyroid, which can be thyroidectomized without difficulty from the other surrounding tissues.
1. The thyroid gland of the sailfish lies on the dorsal cephalic end of the thick ventral aorta, and extends on the bifurcated region of the 1st and the 2nd afferent branchial arteries. So that these spherical soft masses are consisted of a anterrior lobe and a posterior lobe.
2. Ratio of fresh wet weight of the sailfish thyroid/1kg of body weigt is 21.44mg and also aceton dry weight is 4.85mg. There is no remarkable unbalance between the weight of the both lobes.
3. The histological observation of the sailfish thyroid showed obvious hype ?? activity with columnar epithelium and lack of colloid. The lumea of the follicles filled with granular substances or rather reticular fibers.
4. The writer thought that the figure of this preparation revealed the exhaution of the colloid, namely, the secretion of thyroid hormones.抄録全体を表示PDF形式でダウンロード (878K) -
本間 義治1956 年 21 巻 9 号 p. 1019-1021
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーIn this report the writer described on the thyroid gland of two related species of Seriola.
1. The thyroid gland of Seriola. which consisted of a anterior lobe and a posterior lobe, lies on the dorsal cephalic end of the ventral aorta, and extends on the bifurcated region of the 1st and the 2nd afferent branchial arteries. In the fresh materials the coloration of this gland is brownish orange, and these soft masses can be removed easily free from the surrounding tissues and organs.
2. Ratio of fresh wet weight of the thyroid of S. quinqueradiata/1kg. of body weight is 22.73mg. and also S. aureovittata is 34.70mg. There is no remarkable unbalance between the weight of the an ?? erior lobe and the posterior lobe, as ?? een in the tuna thyroid.
3. In the histology of the Seriola thyroid the size and the form of the follicles varies a great deal. There preparations showed similarity to the thyroid of lower teleosts. In general the major follicles showed a figure of mildly or inactivity with flatte ?? ed epithelium and dense colloid. On the contrary, the follicles found in the peripheral region of the thyroid revealed a figure of active condition with columnar epthelium and granulated colloid. These histological preparations may be in restored stage after broeding.抄録全体を表示PDF形式でダウンロード (1058K) -
餌料の粒子組成と量の影響中村 中六, 笠原 正五郎1956 年 21 巻 9 号 p. 1022-1024
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーAs a part of a series of experiments to determine how and why the shoot carp occur, carp fry a few days after hatching were reared with food of different particle size and of different quantity. Their body length distribution was analyzed with the following results:
(1) Body length distribution is approximately symmetrical in the batch of fry fed with small-particle food (cladocerans passing through the 400 μ mesh), but skewed conspicuously in the batch fed with larger particles (cladocerans and mosquito larvae), indicating the occurrence of the shoot carp.
(2) When comparative batches of fry are given the same food in different quantity, the shoot carp occur, i.e. the length distribution is skewed with the mode in smaller length, more conspicuously in the batch fed with “defi ?? ent” quantity of food than in those given “moderate” or “plentiful” quantity.
These results seem to indicate that competition for food between the individual fry within a batch is an important causative factor of the occurrence of the shoot carp.抄録全体を表示PDF形式でダウンロード (253K) -
コイ筋肉の鮮度によるmyosin区-ATPase活性と関連成分の變化について齋藤 要, 日高 富男1956 年 21 巻 9 号 p. 1025-1028
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーThe Present paper deal the post mortem changes in the apparent amount of myosin fraction, .ATP, free SH group and ATPase activity of carp muscle stored at 25°C.
(1) It was observed generally that the longer was the lapse of time after death, the lower the amount of myosin A fraction ?? and ATPase activity became. While the former seemed to increase for a precarious time, and then separation of its fraction became eventually difficult at about 20 hours after death.
(2) Immediately after death, the amount of ATP in the muscle increased rather rapidly, disappearing at about 6-8 hours. And in the myosin fraction, obtained from the ATP-exempt muscle, an ATPase activity was still observed.
(3) The amount of SH group in the muscle decrea ?? ed gradually with the progress of rigor mortis, but it began to increase when the spoilage of the muscle ?? et in. The mode of change of SH group in myosin A fraction was found to be different from that of muscle.抄録全体を表示PDF形式でダウンロード (392K) -
福田 博業, 熱田 寮1956 年 21 巻 9 号 p. 1029-1033
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーAntiseptic treatment with D. H. A. for the preservation of “Kamaboko” are employed, and some effects are obtained. Brayed fish meat, “Kamaboko”, is mixed with D. H. A. and dipped into warm solution of D. H. A. after steaming, and then packed with moistened cellophan with solution of D. H. A. These treatmets are combined and preserved the “Kamaboko” in eatable state for more than 10 days at 25-30°C and full moisture.抄録全体を表示PDF形式でダウンロード (335K) -
Amylolytic Enzyme (Part 1)Yoshiro HASHIMOTO, Shizumasa KIJIMA1956 年 21 巻 9 号 p. 1034-1040
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (426K) -
北洋ナガス鯨胃中のCalanus cristatus佐伯 誠道, 森 高次郎1956 年 21 巻 9 号 p. 1041-1044
発行日: 1956/01/25
公開日: 2008/02/29
ジャーナル フリーCalanus cristatus, collected in the stomach of fin whale caught at the Northern Pacific Ocean, was extracted by alcohol, acetone and ether, and reddish brown oil was obtained. The content of oil of the specime ?? was 58.63 pe ?? cent. in dry matter, and the amount of unsaponifiable matter of the oil was 43.1 per cent.
The mixed fatty acids of this lipid are composed of 16% saturated acids (myristic 9%, palmitic 7% and trace of C18) and 84% unsaturated acids (C14 3%, C16 10%, C18 14%, C20 29% and C22 28%). The observed existence of large amount of unsaturated C20 and C22 acids is noteworthy.
Our results indicates that the Calanus cristatus which feed on diatoms and other marine phytoplankton having a fat containing a relatively small amount of unsaturated C20, and only a little of C22 acids, comes to possess a fat having significant amounts of unsaturated C20 and C22 acids.抄録全体を表示PDF形式でダウンロード (244K) -
1956 年 21 巻 9 号 p. 1045
発行日: 1956年
公開日: 2008/04/22
ジャーナル フリーPDF形式でダウンロード (52K)
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