著者
小川 拡 片野 修 横田 賢史 CARLOS AUGUSTO STRUSSMANN
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.81, no.3, pp.438-446, 2015 (Released:2015-06-05)
参考文献数
18
被引用文献数
1 1

東京都秋川の河床に生息する国内外来種アカザと在来種カジカ大卵型の食性を 5 月から 1 月まで調査した。食性は餌動物の体積比と餌料重要度指数 IRI により解析した。両種ともに主要な餌として,カゲロウ目,トビケラ目,双翅目の幼虫を利用し,それらを摂食する割合は時期によって異なった。カゲロウ目に対する餌選択性は時期により種間で異なり,これは摂食戦略を反映した結果と考えられた。しかし,食性は両種ともに餌生物組成の季節変化に対応し,月によっては種間で大きく重複することから,餌を巡る競合が生じる可能性が示唆された。
著者
松永 浩昌 中野 秀樹 石橋 陽一郎 中山 健平
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.69, no.2, pp.178-184,277, 2003-03-15 (Released:2008-02-01)
参考文献数
15
被引用文献数
3 5

日本におけるサメ類の種別・漁法別水揚量を明らかにする目的で,主要な漁港で市場伝票整理に基づくサメ類の水揚量調査を行なった。製品重量では1992-98年の漁法全体で年平均19,600卜ン,延縄で15,000卜ンの内,ヨシキリザメが11,600トン(59%),11,000卜ン(73%)であった。更に生体重量に換算した結果,全漁法で年平均28,700卜ン,延縄23,400トンとなり,同様にヨシキリザメが18,800卜ン(66%),17,800卜ン(76%)であり,何れの場合も6~8割程度がヨシキリザメで占められていた。ヨシキリザメ以外ではネズミザメ,アオザメが10%前後,オナガザメ類が5%程度と,比較的多く水揚されていた。また,これら主要種の水揚量が減少しているような傾向は見られなかった。
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
pp.18-00050, (Released:2019-06-20)
参考文献数
34
被引用文献数
13

インターネットアンケート調査により,2015年の日本の釣り人数を推定した。釣り人数は海面487.5万人,内水面336.0万人,釣り堀・管理釣り場177.7万人であった。釣り堀・管理釣り場を除く自然水面についてみると,釣り人の割合は海面59.2%,内水面40.8%であった。内水面の上位8魚種の釣り人数はヤマメ・アマゴ118.8万人,イワナ88.7万人,ニジマス82.4万人,アユ77.6万人,フナ76.7万人,ブラックバス66.6万人,コイ56.1万人,ウグイ35.5万人であった。
著者
米山 兼二郎 松岡 達郎 川村 軍蔵
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.5, pp.599-603, 1994-09-25 (Released:2008-02-29)
参考文献数
13
被引用文献数
2 1

An outdoor-tank angling experiment was conducted for wild and domestic groups of Tilapia mossambica to clarify the cause of different catchabilities of fish. A series of release-recapture trials was conducted, in which angled fish were counted for release and subsequent recapture; three times for the wild group and twice for the domestic group. Angling experiences of individuals were examined based on the marks after each series. Pellets taken by fish were weighed after the experiment to examine the potential relationship between feeding intensity and catchability. It was significant that wild fish angled in the first trial were hooked repeatedly in the subsequent trials, while domestic fish were hooked at random in any trial, demonstrating that catchability can be altered by rearing. In addition, the catchable wild individuals were hooked quickly and the uncatchable fish remained unhooked for a longer period in each trial. Large fish took more pellets but there was no correlation between fish size and catchability, implying that the hierarchy in feeding is not related to differences in catchability. Individual differences in the catchability were ruled by precaution behavior, which may change with culture conditions.
著者
山本 孝治
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.6, no.2, pp.105-109, 1937-07-15 (Released:2008-02-29)
参考文献数
6

Soon after spawning the eggs of the Japanese Killifish, Oryzias la ?? ipes (TEMMINCK & SCHLEGEL) and the Dutch-Lion-Head Goldfish, Carassius auratus (LINNAEUS) were kept at various constant temperatures. The time required for hatching and the percentage of the hatched fry were observed. To obtain a series of constant temperatures a SENO-TAUT??'s serial in ubator was made use of, in which 6 constant temperatures ranging from about 11° to 30°C. for the eggs of the Japanese Killifish and 10 constant temperatures ranging from about 12° to 31°C, for the eggs of The Dutch-Lion-Head Goldfish were maintained. The results obtained may be summarized as follows: 1) Water temperatures for normal development of the eggs range for the Japanese Killifish 18° to 30°C., and for the Dutch-Lion-Head Goldfish 15° to 23°C. 2) The relation between the temperature (θ) and the time in days required for hatching (T) may be expressed as given by HIGURASHI and TAUTI by the formula Teaθ=C, where a and C are constants specific to the eggs of the respective kind. The values of these constants found in the present experiment and those of Q10 calculated from them are for the Japanese Killifish a 0.0799, C 1.923 and Q10 2.22, and for the Dutch-Lion-Head Gordfish a 0.0933, C, 1.523 and Q10 2.54.
著者
小出 欽一郎 柳沢 郁子 小沢 昭夫 佐竹 幹雄 藤田 孝夫
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.58, no.10, pp.1925-1930, 1992 (Released:2008-02-29)
参考文献数
25
被引用文献数
1 4

In this report, we investigated microbiologically the cause of the kerosene-like off-flavour in “surimi-based products” (chikuwa) kept at 10°C for 7 days. The results are as follows. From the kerosene-like off-flavoured “surimi-based products”, the appearance is the same as normal, while no swelling, softening, or discoloration was recognized. We isolated bacteria and yeasts, but molds could not be isolated. As the result of a kerosene-like off-flavour reproduction test using these isolates, all yeasts but not all bacteria produced this odor. Among the raw materials (15 kinds) for “surimi-based products”, only natural food preservative produc-ed this odor. Yeast that produced a kerosene-like off-flavour was identified as Debaryomyces hansenii, and the component of this odor was confirmed by GC-MS to be styrene.
著者
梶川 和武 西 翔太郎 中村 武史 毛利 雅彦 川崎 潤二 濱野 明 渡邉 俊輝 吉村 和正
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.1, pp.68-70, 2017 (Released:2017-01-20)
参考文献数
9
被引用文献数
1

いわし棒受網漁業では,操業時に集魚した魚群を水中集魚灯周辺に滞留させる必要がある。本研究では,カタクチイワシ魚群が水中集魚灯(ハロゲン灯,LED灯)周辺の滞留時の分布位置を音響機器で計測した。さらに,本研究で定義したカタクチイワシの視感度に基づいた照度を用い,それぞれの灯具の海中の照度分布を算出した。魚群の分布位置と灯具の照度分布とを照合した結果,滞留時の魚群はそれぞれの灯具の等照度線に沿い,かつ,灯具が異なってもほぼ同じ照度域に分布した。この現象は本種の好適照度の存在を示唆するものと考えられる。
著者
畑 久三
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.15, no.8, pp.375-379, 1949

In order to examine the effect of various color rays on hatching of fishegg, colorless, blue, red, orange and dark color rays were used on the hatching of eggs of Wakasagi (<i>Hypomeius olides</i>), Ugui (<i>Tribo'odon hakueucsis</i>), Carp (<i>Cyprinus caupis</i>), and gold fish (<i>Carassius carassius</i>).<br> The result of experimints is shown as follows:<br> 1. In the case of eggs of Wakasagi, there was no difference on the rate of hatching when they were exposed in orange, red and dark color rays, and other rays showed a good result on hatching. But blue color ray proved no good result and colorles ray was the worst (Table 1).<br> 2. In the experiment of eggs of Ugui, blue, orange and red color were produced good results. There was no difference on rate of hatching among these three color rays. The dark color ray was not good result and the colorless ray was the worst<br> 3. In the case of eggs of carp and gold fish, I can not recon nize the difference of the rate of hatching among those color rays (Table 3 & 4).<br> 4. According to the different fish species and kinds of color rays, there was some difference in the average of days of ha ?? ching and mean variation of days of hatching. On the whole, however, in the case of good percentage of hatching, the value of variation was small.
著者
斉藤 英俊
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.84, no.1, pp.87-93, 2018 (Released:2018-01-19)
参考文献数
36
被引用文献数
1 5

新たな輸入防疫制度の申請対象となったテナガエビ類の流通状況を,2016-2017年に神奈川県,愛知県,大阪府,広島県の釣具店で調査した。新制度施行前は,中国から輸入された外来種チュウゴクスジエビが購入個体数の83-93%を占めた。2016年7月の施行後は,国内産地から供給された在来種スジエビが83-100%を占めた。しかし,広島県や愛知県では施行後もチュウゴクスジエビが5-11%含まれ,国内産地の一つである岡山県で採集されたことから,国内に定着した本種が釣り餌として流通していることが判明した。
著者
張 成年 今井 正 池田 実 槇 宗市郎 大貫 貴清 武藤 文人 野原 健司 古澤 千春 七里 浩志 渾川 直子 浦垣 直子 川村 顕子 市川 竜也 潮田 健太郎 樋口 正仁 手賀 太郎 児玉 晃治 伊藤 雅浩 市村 政樹 松崎 浩二 平澤 桂 戸倉 渓太 中畑 勝見 児玉 紗希江 箱山 洋 矢田 崇 丹羽 健太郎 長井 敏 柳本 卓 斎藤 和敬 中屋 光裕 丸山 智朗
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.84, no.4, pp.674-681, 2018-07-15 (Released:2018-08-31)
参考文献数
31
被引用文献数
3

スジエビには遺伝的に異なる2タイプ(AとB)が知られているが,簡便に判別できるマーカーがない。18S rDNAの塩基配列に基づき,これら2タイプを判別するマルチプレックスPCRアッセイを考案した。日本における本種の分布範囲を網羅する152地点で採集した422個体を分析したところ,各タイプ特有の断片を併せ持つ個体,すなわちヘテロ型は観察されず,AとBタイプは生殖隔離しているものと考えられた。両タイプとも全国的に分布するがAタイプは河川及び湖沼に分布する一方,Bタイプは河川のみで見られた。
著者
浜谷 祐司 舊谷 亜由美 福井 洋平 矢野 豊 武輪 俊彦 里見 正隆
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.84, no.5, pp.1007, 2018-09-15 (Released:2018-10-20)

日本水産学会誌80(6), 956-964 (2014)「シメサバ調味液から分離されたヒスタミン生成乳酸菌の分類と増殖特性」 浜谷祐司,舊谷亜由美,福井洋平,矢野 豊,武輪俊彦,里見正隆 https://doi.org/10.2331/suisan.80.956 上記報文について,不適切な研究結果の図を使用し,科学的な事実を正確に記載しなかったことを理由とした著者からの撤回の希望を受け,投稿規程第9条に基づき本論文の掲載を取り下げる。
著者
崔 相 大島 泰雄
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.27, no.2, pp.97-106, 1961-02-25 (Released:2008-02-29)
参考文献数
21
被引用文献数
32 46

The sea cucumber Stichopus japonicus, is widely distributed along all the coast of Japan. Commercially it is divided into three forms due to the body color, the green, red and black. Of these three, the former two are important, through they have a different market value. As for the taxonomy of this species, there are Stichopus japonicus and S. armata described by E. SELENKA (1867); S. japonicus var. typicus by H. THEEL (1886); and S. armatus and S. roseus by E. AUGUSTIN (1908). K. MITSUKURI (1897) and H. OHSHIMA (1918) made it clear that these were all but synonyms of the S. Japonicus and this remains still accepted. The two forms of the Green and the Red, on the other hand, were first reported by K. MITSUKURI (1912) and were ascribed by the same author to a color variation due to the difference in habitat and thereafter his opinion has been widely accepted by the investigators. Between these two forms, however, there are found some distinct differences, not only morphological but also ecological. The present authors have studied this problem and hereby propose to separate them into two independent communities, ecologically and taxonomically different from each other with the following grounds: 1) The predominant color of the Green is dark bluish green, which varies with individuals from light bluish green to yellowish brown or dark brown. The key tone for the Red is red or brownish red, and the ventrum being in red without exception and to be its characteristic. There are, though very low in their occurrence (no more than 1 to 2 per cent), some intermediate forms with the dorsum similar to the Green and the ventrum similar to the Red, and vice versa. 2) The Polian vesicles of the Green are usually of stumpy shape with dully round tip, while those of the Red are slender with projected tip. 3) The body contractibility of the Red is remarkable and under a mechanical stimulus, for example, it contracts into an almost round shape, while no such habit is observed with the Green. 4) The shape of the ossicles of tentacles is much more complicated in the Red than the Green, whereas the disk of the tables of the former is more round-shaped and the circum-ference of its holes is broader than the latter. As for the size of the disk of tables, when compared with individuals of the same body weight, the Green wins over the Red. 5) The Green has a preference to somewhat lower salinity and eventually finds its favorite habitat on sand and muddy-sand grounds, while the Red with fondness for higher salinity lives mainly in the rock, pebble and gravel grounds. 6) The matured egg of the Red has a gelatinous coating 23-26 microns thick, while the Green has without it. In the coasts of Mie and Aichi Pref., the spawning period of the Red is earlier and shorter than that of the Green. 7) In view of the modes of reaction to the environments, such as growth and adaptation for salinity, the Green and the Red are judged to belong to a different environment, respectively. 8) In summer season when the water temperature is high, almost all of the Red take aestivation, on the contrary 50 per cent of the Green of 6 to 30gr. (weight of body-wall) and 75 per cent of the grown-up are found in aestivation, and younglings of less than 5gr. totally dispense with it.
著者
柏田 研一 柿本 大壱 金沢 昭夫 黒木 敏郎 野沢 洽治
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.25, no.10-12, pp.652-657, 1959 (Released:2008-02-29)
参考文献数
8
被引用文献数
3 4

In the work reported here the vitamin B12 content and its variation in lake and river water was measured. In May 1958, the vitamin B12 content in the water of Lake Ikeda, mesured by Euglena method; it was very small (e. g. less than 1 mγ/l) and no distinct variation in the vertical and horizontal distribution was observed, however, in August, the vitamin increased in content more than twice as much as that of the spring value, the vertical distribution of it showed a close correlation with the quantity of dissolved oxygen and the maximum was shown at the depth of 20m. (Fig. 2) Fish school were also observed in this region. Similar seasonal change in vitamin B12 content was found in water from Kotsuki River, with a low spring level (about O.1 mγ/l) (Table 2, I) and a high autumn level (0.4-4.5 mγ/l) (Table 2, II). And in the river water, high level of vitamin B12 was observed in the morning, and in the daytime the vitamin content decreased with the lapse of time. It was found also that considerable amount of vitamin B12 poured into the river water from the banksoil with the rain-water. (Table 2, II)