著者
中村 智幸
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.65, no.3, pp.434-440, 1999-05-15 (Released:2008-02-01)
参考文献数
30
被引用文献数
16 14

1996年10月から1997年3月にかけて, 利根川水系鬼怒川の小支流において, イワナの人工産卵場の造成と産卵状況調査を行った。10月中旬に, 丸太, 石, 礫を材料に, 幅2m, 長さ6mと9mの産卵場を早瀬に1カ所ずつ造成した。造成の翌日から11月中旬にかけて, 人工産卵場と自然の産卵場でイワナの産卵行動が観察された。1月初旬に産卵場を掘り返し, 2カ所の人工産卵場で計51卵室と8101粒の卵, 10カ所の自然の産卵場で12卵室と2119粒の卵をそれぞれ確認した。発眼率の平均値は人工産卵場78.0%, 自然の産卵場60.1%で, 人工産卵場のほうが有意に高かった。3月中旬には人工産卵場, 自然の産卵場ともにふ化仔魚を確認した。以上の結果から, イワナの増殖に対して人工産卵場の造成は有効な手段のひとつになると考えられた。
著者
山羽 悦郎 水野 寿朗 松下 健 長谷部 優
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.65, no.4, pp.709-717, 1999-07-15 (Released:2008-02-01)
参考文献数
39
被引用文献数
15 17

キンギョの胚操作の指標となる嚢胚期以前の発生段階を, 組織学的, 細胞学的, 発生遺伝学的な視点から検討を加えた。20℃の培養下で同調卵割から非同調卵割への移行(中期胞胚期遷移)は, 9回の同調卵割の後の受精約6時間に起こり, この時期以降を中期胞胚期と定めた。中胚葉分化の指標となるgoosecoidとno tailの発現は受精後8時間に観察され, この時期以降を後期細胚期と定めた。胚盤周囲の卵黄多核層の形成と深層細胞の運動は中期胞胚期に, 胚盤中央部の卵黄多核層の形成と深層細胞の自律的な混合は, 被いかぶせ運動以前の後期胞胚期に観察された。
著者
坂野 博之 淀 太我 HIROYUKI SAKANO TAIGA YODO (独)水産総合研究センター中央水産研究所 (独)水産総合研究センター中央水産研究所 National Research Institute of Fisheries Science Fisheries Research Agency National Research Institute of Fisheries Science Fisheries Research Agency
出版者
日本水産學會
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.70, no.3, pp.313-317, 2004-05-15
参考文献数
29
被引用文献数
3 6

ブルーギルの食性と動物プランクトンに対する餌選択性を明らかにするため, 二つのため池において動物プランクトン種組成とブルーギルの胃内容物組成を明らかにした。両池のブルーギルの胃内容物には動物プランクトンが頻繁に認められた。二つのため池に共通して生息するオナガケンミジンコは一方の池で選択的に摂餌されていたものの, 他方の池ではほとんど摂餌されておらずハリナガミジンコが選択的に摂餌されていた。
著者
今田 千秋 西本 真一郎 原 三郎
出版者
公益社団法人日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.67, no.1, pp.85-89, 2001-01-15
参考文献数
17
被引用文献数
2 3

海洋細菌Alteromonas sp. B-10-31株が生産するプロテアーゼインヒビター(PI)の魚肉粗プロテアーゼに対する阻害効果を調べた。その結果, マイワシ由来のすり身に高い阻害効果が認められたがスルメイカには認められなかった。他の市販PIをマイワシ由来のものに添加しその併用効果を調べた結果, 放線菌由来のロイペプチンが最も効果的であった。海洋細菌由来のPIをDEAE-cellulofineカラムクロマトグラフィーで分画し, 二つの活性画分を得, その各々をマイワシすり身に添加してその効果を調べたところ, 後から溶出する画分(糖タンパク質)にすり身のゼリー強度と弾力性を増加させる効果があったことから魚肉すり身への応用が期待される。
著者
濱野 龍夫 松浦 修平
出版者
日本水産學會
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.52, no.5, pp.787-794, 1986
被引用文献数
3 11

Examination of the stomach contents of the Japanese mantis shrimp <i>Oratosguilla oratoria</i> showed that this species is a very intensive predator on the Macrura which is a principal component of the benthic megalofaunal community. Thus, the mantis shrimp, by feeding largely on the Macrura, may have a major influence on this community structure in Hakata Bay. The shrimp was also revealed to be an intensive predator on the Pelecypoda despite underestimation of preda-tion intensity, based on the stomach contents, because of its shell-smashing behaviour. Further-more, this study showed that many Macrura were captured during September and November by the mantis shrimp and that female shrimp of reproductive sizes also consume many Pelecypoda, As a prey species, mantis shrimp themselves were found infrequently in the digestive tracts of other predators.
著者
坪井 潤一 高木 優也
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.82, no.1, pp.12-17, 2016 (Released:2016-02-03)
参考文献数
27
被引用文献数
4 5

全国 13 水系 25 地点において潜水目視によるアユの個体数カウントおよび環境計測を行った。解析の結果,放流量に関係なく,⑴川幅が狭い川ほど,⑵河床に占める長径 25 cm 以上の石の比率が高い川ほど,⑶浮き石の比率が高い川ほど,アユの観察個体数が多いことが明らかになった。また,那珂川において行った調査では,アユの観察個体数と友釣りによる釣獲個体数に正の相関が認められたため,潜水目視で得られたアユの観察個体数は,友釣りの対象となるアユ資源量の指標として有効であることが明らかになった。
著者
鳥羽 光晴
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.83, no.6, pp.914-941, 2017 (Released:2017-12-22)
参考文献数
267
被引用文献数
15 18

1980年代以降の我が国のアサリ漁獲量の減少について,主要5海域の実態と原因に関する議論を再点検した。減少には埋め立てと乱獲が関与した可能性があったが,貧酸素,河川出水,冬季の波浪減耗,食害生物,病虫害,餌料環境等の関与が指摘され,最終的に原因が特定されている海域はなかった。漁獲量に影響する要因は時間とともに変化しているため,過去の減少と現在の回復不全の要因は異なる可能性があり,減少時期を特定した議論が重要と思われた。原因の特定には各要因の影響を定量的に評価した上での比較検討が必要であろう。
著者
吉村 研治 北島 力 宮本 義次 岸本 源次
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.60, no.2, pp.207-213, 1994-03-25 (Released:2008-02-29)
参考文献数
9
被引用文献数
12 14

In order to investigate the factors inhibiting the growth of rotifer (S-type) in high density cultivation, a series of experiments were conducted, cultivating rotifer in 30l and 1kl vessels by feeding condensed Chlorella. Although there was no difference in the maximum population of rotifer in the culture experiments at different temperatures of 24, 28, and 32°C, the growth rate increased as the culture temperature increased. In the cultivation system supplied with air, the maximum rotifer population did not exceed 4, 000-5, 000 individuals/ml because oxygen levels were restricted due to the accumulation of undissociated ammonia. Feeding oxygen gas to the rotifer culture system enabled high density cultivation with a population of 20, 000 individuals/ml. In such an oxygen-rich culture system, the concentration of undissociated ammonia is considered to be the main factor inhibiting the growth of rotifer.
著者
阪本 俊雄
出版者
日本水産學會
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.42, no.1, pp.1-11, 1976
被引用文献数
2 5

The relationship between age and growth of the ribbon fish, <i>Trichiurus lepturus </i> L<sub>INNE</sub>, which is most common among the bottom fishes in the Kii Channel in recent yearss, have been studied. The study was based on 3, 739 specimens of otoliths and asize composition analysis of 10, 591 specimens from randomly sampled fish, caught by small type trawlers between April, 1972 and August, 1974.<br> The results are summarized as follows:<br> 1) Ribbon fish schools in the Kii Channel usually consist of fishes from two broods, the spring-born and the autumn-born.<br> 2) The annual ring marks on otolith are formed in the spawning season in spring from April to June<br> 3) Hence the radius of the first ring (<i>r</i><sub>1</sub>) in the autumn-born group are smaller than that of the spring-born group. Thus, by the size of the first ring radius, the ribbon fish schools are divided into two groups of spring-born (<i>r</i><sub>1</sub>&ge;2.3mm) and au-tumn-born (<i>r</i><sub>1</sub><2.3mm).<br> 4) The growth equation for spring-born group is estimated as follows;<i>BL</i><sub>1</sub>=568.3{1-exp[-0.261(<i>t</i>+0.6435)]}<br> Because of inadequate number of specimens for the autumn-born group, the growth equation is not estimated here.<br> 5) The calculated values of body length from thsi equation are larger by one age than those body lengths discribed in the former studies.
著者
太田 冬雄
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.19, no.11, pp.1061-1064, 1954
被引用文献数
1

The lustrous particles in epidermis of hair-tail has been utilized as a principal source of pearl essence in making imitation pearl in Japan. In the process of refining the raw particles, first necessaries, of coures, will be to know the content and properties of impurities in the particles. But, little satisfactory analysis of the raw material was found out. Then, the writer attempted to investigate the chemical constituents of raw particles. In this paper, some peculiarities of them were reported. The results obtained were summarized as follows:<br> 1) The particles contained co siderable amount of ash and fat besides nitrogenous compounds which hold the greater part of moisture free particles.<br> 3) The nitrogenous compounds of particles were almost insoluble in water and soluble in the solution of acid and alkali as in the case of guanine which was already identified as a chief constituent of partcles. Most of the nitrogenous compounds of particles dissolved in both acidic and alkaline solution, were precipitated by the neutralization of the solution. Only a little common protein were present in the solution.<br> 3) Phosphorus content of the extractives obtained with organic solvents, varied acording to the sort of the solvent used for extraction and it was the largest in that of alcohol, though there was little difference in the amount of extracives.<br> 4) The composition of ash of particles differed significantly that of common fish scale or fish bone. Namely, the ash of particles was rich in P and Mg, and relatively rich in S, Cl, Na, K, Ca, Fe and Al.
著者
松浦 文雄 橋本 周久
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.20, no.4, pp.308-312, 1954-08-25 (Released:2008-02-29)
参考文献数
15
被引用文献数
19 26

Quantitave estimation of the amounts of hemoglobin, myoglobin, and cytochrome c in the red and the ordinary muscles of fishes was made, using the pyridine-hemochromogen method of de Duvet5) for hemoglobin together with myoglobin, the method of Drabkin7) for myoglobin and the method of Rosenthal and Drabkin14) for cytochrome c respectively. Results obtained were tabulated in Table 1. In general, the red muscles were found to be considerably richer in these pigments than the ordinary muscles. Particularly the deep-seated red muscle, which is found in fishes such as tunny and bonito, contained a surprisingly large amount of myoglobin, from 1 to 2% on a wet basis.
著者
和田 俊 小泉 千秋 滝口 明秀 野中 順三九
出版者
日本水産學會
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.45, no.5, pp.611-614, 1979
被引用文献数
15

The triglyceride composition of lipids of black cod, <i>Erilepis zonifer</i>, was investigated by highperformance liquid chromatography (HPLC) and gas liquid chromatography (GLC). The fatty acid composition of the triglyceride was also analyzed by GLC.<br> The fatty acid composition of the triglyceride was characterized by a high ratio of monoenoic acid content (71.7%) to polyenoic acid content (2.3%).<br> In HPLC, the triglycerides were separated into seven fractions on the basis of their partition numbers. Each of these collected fractions gave three to eight peaks in the GLC chromatograms according to the carbon number of the triglyceride.<br> From these results, it was found that the major triglycerides of black cod lipid are those of C-52 with 2 double bonds, C-54 with 2 double bonds, C-54 with 3 double bonds, C-56 with 2 double bonds, C-56 with 3 double bonds, and C-58 with 3 double bonds, amounting to 54.2% in all.
著者
桑原 昭彦 鈴木 重喜
出版者
日本水産學會
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.49, no.10, pp.1499-1506, 1983
被引用文献数
1

This paper describes the vertical and horizontal distributions, and feeding habits of a sole <i>Heteromycteris japonicus</i> (TEMMINCK et SCHLEGEL) larvae, collected in the western Wakasa Bay, Japan Sea, from June to September 1981.<br> The larvae <i>H. japonicus</i> distributed mainly in the waters between 25m and 50m depth. Small size larvae of less than 3.0mm BL commonly appeared at Sts. A, B and C, and large size larvae of more than 4.0mm BL abundantly at St. A. It is suggested that the larvae shift the habitual area from &ldquo;offshore-coastal area&rdquo; to &ldquo;coastal area&rdquo; as growth of the larvae proceeded.<br> The larvae of less than 4.0mm BL fed mostly on <i>Microsetella norvegica</i> and copepod nauplii. Most of the same size larvae caught at St. A ate <i>M. norvegica</i>, but at St. C. larvae fed on <i>M. norvegica</i> and copepod nauplii. Percentage of larvae carrying food in their alimentary canal was high in those collected at St. A and low at St. C. The larvae of more than 5.0mm BL consumed mainly <i>Penilia avirostris, Podon</i> sp. and <i>M. norvegica.</i><br> According to these findings on feeding habits of the larvae of <i>H. japonicus</i> it is estimated that the offshore area is umsatisfactory for survival of the larvae, compared with the coastal area.
著者
南 卓志
出版者
日本水産學會
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.47, no.7, pp.857-862, 1981
被引用文献数
2 4

The early life history of a sole <i>Heteromycteris japonicus</i> (Temminck et Schlegel) was studied in the western Wakasa Bay and adjacent waters, the Japan Sea.<br> General morphology of the larvae and juveniles ranging from 2.70 mm to 6.95 mm BL, was described. The characteristic features of this fish in early larval stages were distributional patterns of melanophores on the body surface, forming rows along the dorsal body contour extending from the head to tail and along ventral body contour from the abdominal region to the tail.<br> Eggs, postlarvae and juveniles were caught mainly in Yura River estuary and Maizuru Bay, and these areas may be their spawning and nursery ground.<br> Judging from gonad index and occurrence of eggs and larvae, actual spawning may occur in the western Wakasa Bay during the period from May to July.<br> Food items of the gut contents were as follows: copepods nauplii and small copepods in early larvae, copepods and crustacean larvae in metamorphosis, and amphipods and amphipods and copeopods in early juveniles.
著者
謝 文陽 清水 潮 丸山 芳治
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.55, no.5, pp.853-857, 1989-05-25 (Released:2008-02-29)
参考文献数
13
被引用文献数
3 4

Nitrogenase activity associated with the seagrass Zostera marina (eelgrass) was examined by the acetylene-reduction assay method. Most of the rhizome-root complex samples showed significant levels of nitrogenase activity after an initial lag period of 8 to 12 hours under aerobic or anaerobic conditions. However, separated rhizomes and roots rarely showed significant nitrogenase activity. Glucose addition had little effect on the activity of rhizomes but remarkably enhanced the activity of roots, which suggests that heterotrophic nitrogen-fixing bacteria are predominately associated with the roots rather than the rhizomes and also that the rhizome-root complexes show significant nitrogenase activity only when the rhizomes contain adequate energy source the for root-associated nitrogen-fixing bacteria. Most of the root-associated nitrogen-fixing bacteria were probably distributed on the surface and not inside the roots.
著者
佐藤 英雄 中村 中六 日比谷 京
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.28, no.6, pp.579-584, 1962-06-25 (Released:2008-02-29)
参考文献数
12
被引用文献数
19 21

The processes of sex differentiation and sexual maturation of the eel, Anguilla japonica, were examined. In glass eels, the primordial germ cells standing in a line are found in each of the gonads (Pl. I, Fig. 1). The cells gradually increase in number under about 15cm in total length of the bodies, and steadily increase at 18cm or thereabout (Pl. 1, Fig. 2). The sex may differentiate at this stage, and histological structures of gonads become characteristic in both sexes, while ovaries and testes hardly be distinguished by means of their external appearance until the eels come to about 30cm in total length (Pl. I, Fig. 3 and 4). As they grow longer than some 30cm, the discriminative features of ovaries and testes become appreciable. In view of the observations described above, it is suggested that there is neither “phase of precocious feminization” nor “phase of juvenile hermaphroditism” in A. japonica. In testes of eels less than about 40cm, there may be seen many spermatogonia but no spermatocyte (Pl. I, Fig. 5), and the former gradually increase in number accompanying with body growth (Pl. I, Fig. 6). In silver eels having catadromous nature, a number of spermatocytes are found in testes, but spermatids scarcely ever (Pl. II, Fig. 1). In ovaries of eels ranging in total length from 25cm to 40cm, oogonia and primary oocytes are found intermingling (Pl. II, Fig. 3 and 4). As they grow over about 40cm, oocytes increase fast. In catadromous female fish, the cells develop up to the yolk vesicle stage (Pl. II, Fig, 5). It is generally found that the gonadal maturation of eels advance mostly in autumn and somewhat degenerate in winter, though the seasonal fluctuation in maturation are not so obvious.