巻号一覧
7 巻, 5 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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Mituyo OKADA, Tomozirô OGAWA1939 年 7 巻 5 号 p. 251-256
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (402K) -
Itirô MIYAZAKI1939 年 7 巻 5 号 p. 257-261
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (274K) -
谷 正二, 袖山 禮治1939 年 7 巻 5 号 p. 262-264
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーFat-content of red salmons, Oncorhynchus nerka (WALB.), shows different seasonal variations between the shoals caught with drift nets off the coast of East Kamchatka and those caught with keddle nets on the same coast during the same fishing season. With the records obtained in the fishing season of 1937 as basis, such variations were analysed statistically with reference to the simultaneous variations in the weight of gonads, which were proved to be differently correlated with fat-content for the two kinds of shoals mentioned above.抄録全体を表示PDF形式でダウンロード (169K) -
田内 森三郎1939 年 7 巻 5 号 p. 265-268
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーThe intensity was studied with UNO'S data of observation on drift-net skipper in the north-eastern waters of Japan.抄録全体を表示PDF形式でダウンロード (167K) -
宇野 道夫1939 年 7 巻 5 号 p. 269-270
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーBy the same method as used in the four previous reports, 1, 592 individuals of the samples for 1937 were analysed with similar results.抄録全体を表示PDF形式でダウンロード (72K) -
II.再び三面川より得たる材料に就て久保 伊津男1939 年 7 巻 5 号 p. 271-275
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーTwo different stocks of dog salmon, viz., “common” and “silvery, ” were preliminarily reported(2) by the present author from Miomote River, Niigata Prefecture. For the distinction between them, Chi-square tests were done on the following items: thickness of scale, head length, length from snout to posterior margin of base of dorsal-fin, depths of body on anterior margin of base of dorsal and anal fins, length of caudal peduncle, depth of caudal peduncle and total length except head length, with the results given in this paper.
326 “common” and 179 “silvery” specimens ranging from 2 to 5 years old were obtaincd from the same river during a period from December 14th to 21th inclusive, 1937. But female specimens of four-year old only (102 in common; 117 in silvery) were used for the purpose, because the material of other year classes were too scarce (Table, 1).
The results of Chi-square test applied to the data pointed to the conclusion that the two groups are really differentiated samples distinct in such characters as thickness of scale, head length, length from snout to posterior margin of base of dorsal-fin and depth of body on anterior margin of base of dorsal-fin (Table, 3).抄録全体を表示PDF形式でダウンロード (223K) -
久保 伊津男1939 年 7 巻 5 号 p. 276-280
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーWith regard to the yields, namely, Mactra sachalinensis SCHREZCK (A); Pecten (Patino-peeten) yessoensis JAY (B); Anadara inflata (REEVE) (C); Paphia (Ruditapes ?) philippinarum (ADAMS et REEVE) (D)Oyster, mostly Ostrea (Grassostrea) gigas THUNBERG (E); Ear-shell (F); Octopus (G); Sagittated calamary, mostly Ommastrephes sloani pacificus (STEENSTRUP) (H); Sea cucumber (K) and Tangle (Laminaria) (L). from coastal waters of Hokkaidô, a statistical study was made mainly basing on the yearly records issued from the Government Department of Agriculture and Forestry for 26 years from 1911 to '36 (of A and C for 16 years: 1921-'36).
Let α and β represent certain yields (or index number of yiel??) respectively, then the percentage: α/α+β × 100 or β/α+β × 100 was calculated in every combination of any two of the ten products and the results are plotted in curves (Fig. 2). In the combinations A and B, A and D, and B and K, the curves are almost horizontal, showing conjoint propagation of those organisms.
The influence of water temperature on the amount of the catch of Oyster was statistically analysed; since such organism exists in the critical zone of its distribution in Hokkaidô, it sometimes is enormously influenced by environmental factors. The result proved that the water temperature confines the catch to its rather narrow range.抄録全体を表示PDF形式でダウンロード (123K) -
大夫 武夫, 薄井 與兵衞, 木俣 正夫, 石川 龜好1939 年 7 巻 5 号 p. 281-287
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーThe present study aims to make contributions to our knowledge, now rather scanty, of various effects of chemicals in the medium on pisces and mollusca living in. Cyprinus carpio L., Anguilla japonica and Meretrix meretrix (L.), were kept in water in which various chemical substances were dissolved with varying concentrations, and their responses were observed. According to the degree of the responses, the chemical substances employed may be arranged in discending order as follows: metallic salts (such as cupper sulphate, zinc sulphate and lead nitrate), acids and alkalis (such as sulphuric acid, sulphurous acid, ammonia and sodium carbonate) and the others (neutral salts such as salts of alkali metals and alkali earth metals).抄録全体を表示PDF形式でダウンロード (1170K) -
IV. 二三の給餌條件が魚體蛋白の増生量に及ほす影響右田 正男, 花岡 資1939 年 7 巻 5 号 p. 288-296
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリー1. The rate of growth of fish can be taken for constant till increase in body weight amounts to 60% of the initial, even when the fish is kept daily on the same ration.
2. Divide the whole feeding period during which fish grows with constant velocity in n equal intervals, and let the increase of body protein for unit initial body weight in the first interval be p1 and that in the whole period be p and the increase of body protein, in an arbitrary i-th interval for unit body weight at the beginning of this interval be p1. Then we have the following relations.
1/Pi=1/p1+(i-1)k (1)
in which k is a constant which denotes the ratio of body protein to body weight, and p1 is expressed as already proved*, in the following formula:
p1=e-a1-b1x(x-x0) or p1=A1e-b1x(x-x0),
where x is the feeding amount of protein in the first interval and x0 is that equivalent to maintenance protein. p=np1=nA1e-b1x(x-x0) (2)
If during the whole period fish grows with constant velocity even on the same daily ration, we can rewrite the formula (2) into “the equation of accumulation of body protein” which represents the relation between the amount of food protein and the accumulation of body protein. p=A1e-b1/n(nx)(nx-nx0) (3)
3. Let the equation of accumulation of body protein when a given amount of food protein is divided equally to each day and administered in a certain unit period be p1=Ae-blx(x-x0). Now suppose that the same amount of protein is given in a period of n units, and that the rate of growth of fish remains still unchanged, then the accumulation of body protein pn will be pn=A1e-b1/nx, /suo(x-nx0) (4)
The value of pn is maximum when
n=1/2x0(√b12x02+4b1x0-b1x0)x. Denote this value of n by n0, then n0 is proportional to the total amount of food protein x. Therefore, under the above conditions the daily amount of food protein which gives the maximum growth is independent of x. Putting the value of n0 into (4), we have
pn0=A1e-b1x0/B(1-B)x=Kx, where B=1/2(√b12x02+4b1x0-b1x0).
It is seen that if food protein, of which total amount is given, is administered in the optimum period, accumulation of body protein is proportional to the given amount of food protein.
4. Suppose that under the conditions that the rate of growth of fish is constant even with the same daily ration, both the total amount of food protein, 2α, and the feeding period are given. If the given period is divided equally and the feeding amounts of protein in both intervals are a-ε and a+ε respectively, the total increase of body protein p will be, p=Ae-b(a-α)(a-α-x0)+Ae-b(a+α)(a+α-x0),
where x0 is the feeding amount of, protein equivalent to the maintenance protein in the half period.抄録全体を表示PDF形式でダウンロード (594K) -
酒向 昇1939 年 7 巻 5 号 p. 297-301
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーThe material obtained in Ibaraki Prefecture during a period from May to July, 1938 shows that the fish of that region attains sexual maturity when it is about 16 cm long and one year old. Several peaks observed in the ferquency distribution curve of the body length of the fish of the same age point to the existence of several separate spawning seasons.抄録全体を表示PDF形式でダウンロード (234K) -
和田 憲夫1939 年 7 巻 5 号 p. 302-304
発行日: 1939/01/15
公開日: 2008/02/29
ジャーナル フリーMatukawaura is very shallow (nearly 50 cm) lagoon along the Pacific coast of Hukusima Prefecture. There are two big inflowing rivers at the northwestern shore of the lake. The communication of the water in the lagoon with the sea is going on through an artificially constructed canal at its northern end. Hydrographical observations were made on July 31 and Aug. 1, 1938. The water of the northern part is cool, high in chlorinity and dissolves sufficient salts such as nitrate and phosphate which are supplied by the rivers. On the other hand, the water of the southern part is warm, low in chlorinity and poor in nutrient salts. Porphyra tenera which is cultured in abundance at the northern part of the lagoon is corresponding with the richness of nutrient salts there.抄録全体を表示PDF形式でダウンロード (190K)
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