日本水産学会誌
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ISSN-L : 0021-5392
36 巻, 4 号
選択された号の論文の13件中1~13を表示しています
  • 精巣の季節的変化
    高橋 延昭, 高野 和則
    1970 年 36 巻 4 号 p. 337-344
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    北海道八雲産ウバガイの精巣の周年変化について組織学的研究を行ない次の結果を得た。
    1. 雄性生殖細胞の成熟過程はその細胞学的特徴により5期に区分でぎた。(1) 精原細胞期, (2) 第一次精母細胞期,(3) 第二次精母細胞期, (4) 精細胞期, (5) 精子期。
    2. 精巣の成熟度はそれを構成する生殖細胞の細胞学的特徴および成熟精子の量に基いて6期に区分し得た。(1) 放精終期, (2) 休止期, (3) 成長前期, (4) 成長後期, (5) 成熟期, (6)放精期。
    3. 本種の精巣は9月から11月まで休止期にあるが, 12月から精原細胞の増殖分裂が起り成長前期に入る。2月から4月中旬まで成長後期の精巣が認められ, 4月下旬から成熟期に入つて成熟精子が急速に生産され, 5月下旬より6月上旬にかけての放精期に至る。その後残存精子等の吸収が行われる放精終期が8月まで続ぐものと思われる。
  • 卵巣の季節的変化
    高橋 延昭, 山本 喜一郎
    1970 年 36 巻 4 号 p. 345-352
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    1. Seasonal changes in the ovary of the surf clam, Spisula sachalinensis, collected in Yakumo, southern Hokkaido, were examined histologically. The process of the development of female germ cells was classified into (1) oogonium stage, (2) synaptic stage, (3) early yolkless stage, (4) late yolkless stage, (5) early yolk-formation stage, (6) late yolk-formation stage, and (7) maturation stage. Cytological characteristics of the female germ cells of each stage are described, especially concerning the formation of yolk and chorion in germ cells.
    2. On the basis of cytological characteristics of female germ cells and of per cent ratio of oocytes of each stage, maturational processes of the ovaries were classified into (I) spent stage, (2) recovery stage, (3) early growing stage, (4) late growing stage, (5) maturing stage, and (6) spawning stage.
    3. In the ovary, germ cells of the oogonium stage and of the synaptic stage are present embedded in the germinal epithelium throughout the year. In early October, oocytes of the yolkless stage begin to appear and grow gradually until December. Yolk formation in the oocytes begins in January, which causes a rapid growth of the ovary during the successive months. The ovary reaches its maximum size mostly in late April, but actual spawning is carried out during the period from late May to early June. The spawning is followed by a period of degeneration and disappearance of the remaining oocytes, which continues for one to two months, and then the ovary enters a period of gradual recovery for the next crop of oocytes.
    4. An egg membrane appears at first at the place where the oocytes are protruded from the germinal epithelium, and no membrane can be found at the basal part of the oocyte buried in the germinal epithelium. At the early yolk-formation stage yolk globules make their appearance at first in the cytoplasm of the egg stalk and then are found distributed evenly throughout the whole cytoplasm of the oocyte.
  • 代田 昭彦
    1970 年 36 巻 4 号 p. 353-368
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    Studies on the mouth size of larval fishes have not yet been fully made. The author measured the mouth size of various larval fishes which had absorbed yolk and just begin to take natural live food, and studied the relationship among mouth size, food size and growth of fish. Total body length of the material fishes ranged from 10 to 20mm.
    The results obtained are as follows.
    1. No definite relationship was found between the mouth size and the total body length at the time of commencement of feeding.
    2. The mouth size of various larval fishes at the time of commencement of feeding ranged from 200 μ to 1.000 μ and was observed to have a close relationship to the size of their natural foods: That is, larval fishes having small mouth sizes, such as Hypomesus, Plecoglossus, Ammodytes, Sillago, Konosirus and Oplegnathus take only phytoplankton, protozoa and the nauplii of small copepods, but larval fishes having big mouth sizes, such as Thunnus, Katsuwonus, Seriola, Girella, Mugil, Lateolabrax and Clupea were found to easily take large copepods at the time of commencement of feeding.
    3. Although the body size at the time of commencement of feeding, in fishes of rapid growth such as Thunnus, Katsuwonus, Seriola and Scomber, was much smaller (about 1/2) than that of Clupea, their mouth size was equal to or larger than that of Clupea.
    4. It was made clear that the quicker the growth of fish, the greater is the mouth size at the time of commencement of feeding.
  • アマノリの干出時の光合成能と生長
    今田 克, 斎藤 祐一, 前木 樹
    1970 年 36 巻 4 号 p. 369-376
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
  • ウニ体液におけるたん白濃度とたん白および粘液多糖類の電気泳動パターンの季節的変動
    清水 幹博
    1970 年 36 巻 4 号 p. 377-384
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
  • 北御 門学, 山本 宏
    1970 年 36 巻 4 号 p. 385-390
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    Hyaluronidase of crude extract from mackerel gastric mucosa was concentrated by ammonium sulfate precipitation and Sephadex G-100 filtration up to about 30 fold purity. This purified preparation was completely free from β-glucuronidase. Analysis of the reaction products demonstrated that the principal products by the preparation were a series of even numbered oligosaccharides which have N-acetylhexosamine end group, and this enzyme was a β-endo-N-acetylhexosaminidase. Transglycosylation activity of the preparation was also demonstrated by the fact that the higher oligosaccharide was produced by the action of the enzyme on tetra-or hexasaccharide.
  • 石田 祐三郎, 藤井 建夫
    1970 年 36 巻 4 号 p. 391-396
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    There are a large number of halophilic and halotolerant bacteria(2.4-4.8×105 cells per g of salt) in solar salt. The dominant strains isolated have been considered to belong to the genera Flavobacterium and Brevibacterium-those unable to grow in the absence of salts-, and the genus Micrococcus-those able to grow in the absence of salts.
  • 石田 祐三郎
    1970 年 36 巻 4 号 p. 397-401
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    Incubation temperature was shown to have an effect on the optimal concentration of NaCl in forty-eight strains isolated from solar salt. Of these, twenty-one strains did not grow in 5% NaCl at 35°C, but grow at 27°C and 22°C. These mainly belonged to the genus Flavobacterium. The remaining six strains were unable to grow in less than 10% NaCl at 35°C, in spite of growing in 10% NaCl at 27°C and 22°C. These belong to the genus Brevibacterium. The optimal concentration of NaCl in some strains among the Brevibacterium and Flavobacterium was found to decrease with lowering temperature.
  • 解凍中の色変について
    尾藤 方通
    1970 年 36 巻 4 号 p. 402-406
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    The discoloration of frozen tuna meat blocks during defrosting in water or air at different temperatures (0, 2, 10, 20 and 30°C) was examined.
    1. When defrosted in water, the rates of discoloration of 3×5×8cm blocks (about 135g each) were about the same, irrespective of defrosting temperatures, while those of 5×6×11cm blocks (about 350g each) were slightly lower at 10°C and 20°C than at 0°C and 30°C (Figs. 2 and 3).
    2. The rates of discoloration of 5×6×11cm blocks (about 350g each) defrosted in air of temperatures from 2°C to 30°C were lowest at 20°C (Fig. 4).
    3. When 6×8×14cm blocks (about 700g each) were defrosted in running water at 7°C, for about 4 hrs, the change of meat color was very slight, while the discoloration of the blocks was rather marked when defrosted in air at 2°C, for about 44 hrs. The blocks which were first defrosted in running water and then kept at 2°C for a further 40 hrs, showed intermediate discoloration rates (Fig. 6).
    4. Based on the above results, it is suggested that the length of time required for the frozen meat block to pass the temperature range from -5°C to -1.5°C may be responsible for the discoloration: The longer the length of time, the more the discoloration.
  • アミノ酸飼料による飼育実験
    青江 弘, 増田 績, 阿部 勲雄, 斎藤 孝士, 豊田 俊子, 北村 佐三郎
    1970 年 36 巻 4 号 p. 407-413
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    By repeated feeding experiments, amino acid test diets after the formulae both for salmonoid fishes and for channel catfish were found to be unable to sustain the growth of young carp.
    The hydrolyzates of casein after treatment with trypsin could not replace casein itself. A higher level of cellulose flour or agar-agar was effective in controlling the retention time of amino acid test diet in the intestine to the extent of that of the casein-gelatin test diet, but the growth of young carp was improved not at all. These results suggest that there is a specific aspect in the protein nutrition of young carp.
  • 魚およびウサギ筋肉たん白質のゲルろ過による溶出パターン
    梅本 滋, 神名 孝一
    1970 年 36 巻 4 号 p. 414-420
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
  • コイの腸内における微生物によるビタミンB12の生産
    柏田 研一, 手島 新一, 金沢 昭夫
    1970 年 36 巻 4 号 p. 421-424
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
    After cultivating carp with several test diets for 10 days, the amount of B12 in the intestinal contents was determined by the micro-bioassay method using Lactobacillus leichmannii.
    A considerable amount of B12 was observed in the intestinal contents of the fish fed on B12-free diets. Moreover, a remarkable increase of B12 was observed when the excised intestinal canal was incubated in vitro for 6 hours at 25°C. The addition of sulfanylamide to the diet did not always cause the decrease of B12 in the intestinal contents.
    These results indicate the production of B12 by microorganisms in the intestinal canal of carp.
  • 橋本 芳郎, 神谷 久男
    1970 年 36 巻 4 号 p. 425-434
    発行日: 1970/04/25
    公開日: 2008/02/29
    ジャーナル フリー
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