巻号一覧
6 巻, 5 号
選択された号の論文の15件中1～15を表示しています
- |<
- <
- 1
- >
- >|
-
Masao KIMATA1938 年 6 巻 5 号 p. 219-222
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (231K) -
Itirô MIYAZAKI1938 年 6 巻 5 号 p. 223-232
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーIn recent years a method of oyster culture, i. e., the so-called raft- or hanging-method has become popular all over the coast of Japan. In the said method, as the name signifies, clusters of oysters to be cultured are hung and suspended in the sea by steel wire from the raft which is kept buoyant by some floats. While thus the oyster clusters are relaid in the sea, many kinds of sessile organisms settle and grow on the living oyster shell often as densely as they almost cover up the whole surface of the shell-flish. The condition that the oysters are continuously immersed in the water, not being given the chance of exposure to the air even in the receding tide is the chief cause of the fouling. The fouling organisms stand undoubtedly as food rivals to the oyster, because many of them are plankton feeders, and so it is quite certain that the fouling brings about the retardation of the growth of the oyster to some extent. Not only that, some organisms, such as compound ascidians and others encrust the shell surface as they grow and often almost choke the oyster. The oyster thus comes under the deleterious effect in many ways by the fouling. And moreover, the fouling organisms are a great nuisance to the oyster farm. When the season comes and the oysters are collected for marketing, it is the most tedious work to clean off the fouling organisms from the oysters. In some cases when the growth of the fouling organism is very heavy, the collected mass of the oyster s consists in greater part of fouling organisms, not of the oysters themselves. Such cases are not quite rare. Nevertheless, by virtue of the rich fouling the oyster culture farm of the raft-method makes good fishing place for edible fishes, as many of them gather under and around the raft where the oysters are suspended in the sea. The oyster clusters overgrown by fouling organisms give the fish its gool sheltering place on one hand and plenty supply of its food on the other.抄録全体を表示PDF形式でダウンロード (1551K) -
Mituyo OKADA1938 年 6 巻 5 号 p. 233-236
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (207K) -
Muneshige WATANABE, John Lawson HAPT1938 年 6 巻 5 号 p. 237-239
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (168K) -
宇田 道隆, 渡邊 信雄1938 年 6 巻 5 号 p. 240-242
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーThe materials were obtained from the report of the commercial fishing-boats in the fishing-season of skipper from September to December in 1936.
Figs. 1 and 2 show the distribution of catch and the displacement of the fishing-centre in addition to the tracks of cyclones. We can see at once that in late December and early October the fishing regions of bonito and of skipper are located in coupled positions face to face with each other off the east of Kinkazan, the former lying near the 20°C isothermal line and the latter near the 18°C isothermal line.
Owing to the pass of cyclones in autumn, the sea water is cooled rapidly almost 1°-2° in a few days and shows a conspicuous southward growth of Oyasio Cold Current (Figs. 4 and 5). Corresponding to this hydrographical change, fishing locality of skipper moves quickly to the SW (Fig. 3). Two offshore and coastal branches in early October are of skipper-fishing locality united into a coastal one in mid October, and at the same time the bonito fishing ends.抄録全体を表示PDF形式でダウンロード (234K) -
清水 房雄1938 年 6 巻 5 号 p. 243-244
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーThe present experiment ascertains that a cotton netting cord is cut by a single blow always at a constant loss of energy on the part of the acting body, irrespective of the mag-nitude of the exerted impulsive force.抄録全体を表示PDF形式でダウンロード (76K) -
三善 清旭1938 年 6 巻 5 号 p. 245-246
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーAn apparatus to record simultaneously both the thickness and the number of twist of a netting cord was newly constructed. It is ascertained that, from the degree of disuniformity of these quantities, the variation in breaking strength of a netting cord is roughly compu-table.抄録全体を表示PDF形式でダウンロード (612K) -
安田 秀明1938 年 6 巻 5 号 p. 247-248
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーIt is examined in the present experiment how the mentioned effect is influenced by the number of twist per unit length of the cord, with cotton, ramie and Manila hemp cords, just the same method as in the report (I) being employed. The results are summarised as fol-lows: - (1) Any cord, irrespective of the number of twists, in both dried and wetted states shortens gradually to a final definite length. (2) In the case of cord of soft-twist constructed by soft-fibres the final length is longer in the wetted state than in the dried, while in the case of cord of hard-twist it is shorter in wetted than in dried state. On the contrary, a cord constructed by hard-fibres does not show such a change with the number of twists.抄録全体を表示PDF形式でダウンロード (130K) -
I. 年齢組成、全長及び體重松原 喜代松1938 年 6 巻 5 号 p. 249-250
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーIt is customary in Hokkaidô to separate the landings of the cod, Gadus macrocephalus, as to whether the fishing ground is a bank or an offing. With a view to study this problem statistically, the author examined 189 specimens from bank and 764 from off-shore regions. As shown in Table 1 and Figs. 1-2, the landing from the former consisted of 2-to 6-year. classes, of which 3-and 4-year ones form the majority. On the other hand, the latter represented 3 to 6 year classes, by far 4 and 5 year ones. The former was on the average greater than the latter of each corresponding year class in total length and body weight.抄録全体を表示PDF形式でダウンロード (137K) -
(第二報) サケ(Oncorhynchus keta) (WALB)佐藤 六治1938 年 6 巻 5 号 p. 251-261
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーFourteen fishes traversed new migratory courses. One fish, tagged at Nachika in Karaginskii District, was recaptured at Suribati Bay of Paramusiro Is. One, tagged at Gulf of Kamchatskii, was recaptured at south Kishika on the west coast of Kamchatka. Of the three fishes tagged at Cape Kronotskii, 2 were recaptured in Gulf of Kamchatskii and one at Ozernaya. Of the 8 fishes tagged at Tirihoi Is. in the Middle Kurile Islands, 7 fishes were recaptured at Mitoka, Muisovaya, Vorovskaya, Krutogorova and Oblukovina, on the west coast of Kamchatka and one at Tavisk in Okhotskii District. The last one tagged at Tomarisaki of Paramusiro Is, was recaptured at Avekov in Giziginskii District.抄録全体を表示PDF形式でダウンロード (747K) -
I. 三面川より得たる材料に就て久保 伊津男1938 年 6 巻 5 号 p. 262-265
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーOf 192 specimens obtained from the Miomote River, Niigata Prefecture, during a period from November 20th to 28th inclusive, 1936, 170 were “common” dog salmons, ranging from 2 to 6 years in age. The 3 -year and 4-year classes are predominant, the latter representing more than the half of the catch (Fig. 2, D). The remaining 22 specimens are called “silvery” and may be distinguished from the “common” by having silvery colour of the body, the deciduous scales and more reddish colour of the flesh. But paucity of the material does not enable one to draw up strict distinctions between the “common” and “silvery” so far as the measurements of body length, depth of body, body weight, ratio of depth of body to body length, and number of scales go (Figs. 1-2, Tables 1-3).抄録全体を表示PDF形式でダウンロード (957K) -
矢部 博1938 年 6 巻 5 号 p. 266-268
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーNo clupeoid fish of Japan has yet been known to spawn in the river. In the lowermost part of the River Kin which discharges into the Yellow Sea, a considerable amount of Ilisha elongata is captured in June. In this season the fish comes from the sea into the lower part of the river for spawning, gravid with matured reproductive elements. The spawning ground extends from the river mouth to about 15 km upward. The salinity at. the river mouth was 23.7‰ at the high tide and about 12.0‰ at the low (June 23, 1937). The egg is pelagic, sphe-rical in shape, and measures 2.22 to 2.48 mm in diameter. The perivitell:ne space is large. The yolk is 1.71 to 1.87 mm in diameter, transparent and vesicular structure, provided with a single yellowish oil-globule measuring 0.38 to 0.42 mm (Fig. 2, a). The newly hatched larva, 51 mm in total length, retains the oil-globule at the posterior end of the ellipsoid yolk-sac. The anus opens under the 40th myotome. Melanophores are found on the dorsal side of the head and nape, on the dorsal half of the oil-globule and in front of the rectum (Fig. 2, b). The number of the myotomes was enumerated as 39+19=58 in a larva of 2 days old. Hat-ching seems to take place about 30 hours after being spawned at temperatures ranging from 23° to 26°C.抄録全体を表示PDF形式でダウンロード (261K) -
吉田 裕1938 年 6 巻 5 号 p. 269-273
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーA tropical sardine-like fish “ ?? ul ?? anji” (Korean name) is distributed along the south and west coasts of Korea. Based upon the statistical analysis of the specific characteristics, the author has ascertained that “ ?? ul ?? anji” of Korea hitherto recorded, and many specimens before him altogether, are referable to Thrissa purava (Hamilton), but not to Thrissocles grayi BLEEKEh(=Th. hamiltoni (Gray)) as has been thought. The smallest post-larva or “white fish” whicR the author could trace back is 11.5mm in total length. There are 47 myotomes in the body, the anus lying under the 28th myotome. In the anal fin 35 rays has appeared, with a space behind it for 6-7 more rays. The origin of the anal fin is situated slightly behind below the posterior end of the dorsal base. As a characteristic of the post-larvae, the anus is situated a little anteriorly to that of the post-larvae of Clupeidae or nearly allied groups. During growth the anus and the dorsal fin shift forward, while the ventral fin scarcely changes its ori-ginal situation. The body gradually increases in height and becomes compressed. The maxillary end tapers to stretch backward. At a length about 35.0-40.0mm, the surface of the body becomes wholly scaled and silvery, the relative position of the fill and the anus is settled, and maxillary end scarcely extends beyond the base of pectoral fin. Thus the post-larval “white fish” stage is passed over. The post-larva of the present species can be distinguished from those of the nearly allied and concurrent species of Korea, i. e., Engraulis japonicus TEMMINCK& SCHLEGEL, Stolephorus koreanus (KISHINOUYE), and Setipinna gilberti JORDAN & STARKS, by the number of anal fin rays and myotomes in the body.抄録全体を表示PDF形式でダウンロード (383K) -
柳川 鐵之助1938 年 6 巻 5 号 p. 274-276
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーMucilagenous extracts from 30 species of red-algae (Florideae) were treated with 2% NaOH solution in boiling water and the influences were studied.
From the results as shown in tables 1 and 2, we know: 1) that, the relative viscosity is generally degraded; 2) that, the jellifying power of mucilagenous extracts from 3 species (Pterocladia tennis OKAM., Gracilaria covfervoides GREV. and Gracilaria gigas HARV.), are much increased ; and 3) that, the content of combined sulphuric acid group is generally decreased.抄録全体を表示PDF形式でダウンロード (223K) -
蛋白消化率に及ぼす脂肪溶劑の影響大谷 武夫, 町田 佐一1938 年 6 巻 5 号 p. 277-281
発行日: 1938/01/15
公開日: 2008/02/29
ジャーナル フリーA certain quantity of sardine meal of an inferior quality was purposely used as the control which contained 5.04% of ether-extractable matter and its odour was of an unpleasant character. This material was found, contrary to the results of other investigators, superior to the material, which had been.treated with ether, in the digestibility of protein when tested in vitro (Table 1) but similar to the latter on the point in question when tested in vivo (Table 2). It may be mentioned that the meal which had not undergone extraction by ether was eaten by white mice when given together with polished rice much less than the meal extracted by ether and mixed with polished rice. This fact mainly accounts for the slackening of the growth of white mice fed with untreated sardine meal (Fig. 1, C and D).抄録全体を表示PDF形式でダウンロード (352K)
- |<
- <
- 1
- >
- >|