著者

近藤 史崇 岩井 俊治 三浦 智恵美 坂田 潤弥 太田 史 井戸 篤史 入江 奨 岡松 一樹 角正 浩一 三浦 猛

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.16-00030, (Released:2016-11-01)

参考文献数

41

被引用文献数

5 7

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養殖クロマグロに最適な飼料の開発を目指して,EP給餌と生餌給餌の体成長と消化関連因子の比較を行った。EP給餌のクロマグロの体成長は胃のペプシン活性が減少した後に一旦停滞したが,その後,幽門垂の肥大化に伴うプロテアーゼ活性の増加により生餌給餌と同程度に回復した。EPは生餌に比べて難消化であるため胃での滞留時間が長く,消化関連因子(cck, pyy)は生餌より遅れて発現した。成長関連因子(ghrelin)は餌の消化管内での移動に伴って発現が変動し,EP飼料では有意に増加する事が明らかとなった。

著者

吉村 研治 大森 庸子 吉松 隆夫 田中 賢二 石崎 文彬

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.62, no.6, pp.897-903, 1996-11-15

参考文献数

6

被引用文献数

7 7

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In a high density culture of rotifer (beyond the levels of 10³ind./m<i>l</i>), the amount of aeration needed to maintain an optimum dissolved oxygen (DO) level increases. In order to investigate the effect of aeration on the population growth of rotifer, a series of experiments were carried out. The S-type rotifer <i>Brachionus rotundiformis</i> was cultured at high density using 10<i>l</i> vessels under different aeration conditions. Air or oxygen gas was introduced into the culture media through two types of sparger which formed different sizes of bubbles, at aeration rates from 0.1 to 2.0vvm. The bubble-size from the two kinds of sparger were estimated from the value of <i>KLa</i> (volumetric oxygen transfer coefficient). When the aeration rate was high or the ceramic sparger that formed smaller bubbles was used, DO in the culture system remained at a high level. However, under these conditions, the growth of the rotifer population was seriously inhibited due to very high aeration rates and small bubbles, possibly as a result of foaming separation. When oxygen gas was introduced into the culture system, the density of rotifer was higher than that when air was introduced. Therefore, it is recommended to introduce high-purity oxygen gas for a high density culture to avoid any growth inhibition and to maintain optimum DO.

著者

堀井 善弘 佐伯 拓磨 西村 麻理生 神澤 識大 田中 彰 大泉 宏

出版者

The Japanese Society of Fisheries Science

雑誌

日本水産學會誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)

巻号頁・発行日

vol.76, no.2, pp.267-268, 2010-03-15

被引用文献数

1 1

著者

木村 昇 秋場 稔

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.37, no.12, pp.1207-1213, 1971-12-25 (Released:2008-02-29)

参考文献数

20

被引用文献数

1 1

---

Iron-sulfide blackening of the headspace and liquid parts of tin cans was investi-gated. In the lid and bottom of the C-enameled can, a definite area of iron layer was exposed by scratching the enamel and the tin layers. These cans were filled to 2/3 volume with cysteine solution containing 0 to 4% NaCl at various pH values from 5 to 8. Other cans were 2/3 filled with an extractive of King crab meat containing the cysteine solution. The blackening of the iron surface was observed organoleptically and quantitatively for 6 months at 37°C. In the headspace, the blackening was accelerated by lower pH values and higher concentrations of NaCl. On the contrary, blackening of the liquid parts was remarka-ble at higher pH values and lower concentrations of NaCl. The existence of copper in the crab extractives accelerated the blackening. The acceleration was significant in the liquid part but not in the headspace.

著者

大関 芳沖

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.80, no.1, pp.90, 2014

著者

重田 利拓

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.74, no.5, pp.868-872, 2008 (Released:2008-09-27)

参考文献数

14

被引用文献数

8 6

著者

今井 一郎

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.83, no.3, pp.314-324, 2017 (Released:2017-05-22)

参考文献数

87

著者

松田 紀子 白木原 美紀 白木原 国雄

出版者

日本水産學會

巻号頁・発行日

vol.77, no.1, pp.8-14, 2011 (Released:2012-12-06)

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天草下島周辺海域に周年定住するミナミハンドウイルカTursiops aduncusを対象としてイルカウォッチング船が群れの行動に及ぼす影響を調べた。陸上定点から群れの行動観察を行い,群れの位置をセオドライトで計測した。個体が間隔を詰めて同調的な潜水浮上を繰り返す時,ウォッチング船が1隻でも存在すると,不在時に比べて潜水時間が長くなり,浮上中の速度が増加した。4,5隻以上存在した時,潜水地点から浮上地点までの距離が増加し,浮上時間が減少した。群れに接近可能な隻数制限の導入が必要である。

著者

北野 聡 中野 繁 井上 幹生 下田 和孝 山本 祥一郎

出版者

日本水産學會

巻号頁・発行日

vol.59, no.11, pp.1837-1843, 1993 (Released:2011-03-05)

著者

北野 聡 中野 繁 井上 幹生 下田 和孝 山本 祥一郎

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.59, no.11, pp.1837-1843, 1993

被引用文献数

14 17

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Diet, foraging behavior, growth, sexual maturity, and spawning site selection were studied in a wild population of exotic rainbow trout <i>Oncorhynchus mykiss </i>in the spring-fed Horonai stream in Hokkaido, Japan. During spring and summer, the rainbow trout ate primarily aquatic and terrestrial invertebrates, but eggs and larvae of river sculpin <i>Cottus nozawae</i> constituted 10% of the diet by number in spring. Rainbow trout typically held focal points in the stream flow and intercepted food items in the drift. Sexually mature individuals caught in late January were ages 1-5⁺. Males ranged 11.0-36.5cm and females 16.8-33.1cm in fork length. Females constructed spawning redds in calm riffles with fine gravel substrate. Our re-sults suggest that introductions of rainbow trout may have detrimental effects on Japanese stream fishes and other aquatic biota through interspecific competition for food and space and/or predation.

著者

高田 幸二 西元 諄一

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.24, no.8, pp.632-635, 1958 (Released:2008-02-29)

参考文献数

9

被引用文献数

7 7

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Choline-content was estimated for white and red muscles and viscera of various fishes of migrating and demersal habits, including sharks and cuttle fish. Its seasonal variation was also measured, values fairly characteristic of each fish being obtained. The amounts of choline and trimethylaminoxide(TMAO) increase generally in winter for demersal fishes and in summer for migrating ones. Decrease of freshness makes the chief cause for the increases of choline and trimethylamine (TMA) in common with different kinds of fishes. In cuttle fish and sharks, choline and TMAO contents were especially of large values, their rates of change being somewhat remarkable. Similarly to the case of salt-water fish, the choline content in fresh-water fish increased at first but decreased afterwards with the advance of putrifaction. It is noticed that TMA was formed even in the absence of TMAO, the known mother substance of TMA. The choline formation in this study was confirmed to be a bacterial doing.

著者

志水 寛 柄多 哲 西岡 不二男

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.42, no.9, pp.1025-1031, 1976-09-25 (Released:2008-02-29)

参考文献数

12

被引用文献数

11 12

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The extractability of proteins from fish muscle homogenates was investigated at ionic strengths ranging between μ 0 and 0.3 (pH 6.8 ?? 7.0; ratio of muscle to extractant, 1:30) with 18 species of teleosts. Species variations were observed in the extraction patterns obtained between μ 0 and 0.05. As the ionic concentration was raised from μ 0 to 0.05, the amount of extractable protein increased rapidly in dark meat fish (migratory fish) such as sardine or chub mackerel and increased slowly in fish such as horse mackerel or lizard fish which are considered to be intermediate between dark and white meat fish. In white meat fish (bottom fish) such as Alaska pollack or nemipterid, however, the extractabilities more or less dcreased in the range of μ 0.025-0.05.Such differences between dark and white meat fish are attributable to a fraction eluting at Kav 0.2 ?? 0.3 on Sephadex G 200 filtration which is abundant in the sarcoplasm of the former (chub mackerel), and the greater solubilization of myofibrils from the latter (Alaska pollack) at ionic strengths of μ 0.025. From the results, μ 0.05 was recommended as the optimum concentraion for extracting sarcoplasmic proteins from either dark or white meat fish. The values of 0.05μ extractable protein nitrogen obtained in this study closely corresponded with those of non-protein nitrogen, the latter being an accepted marker for distinguishing between the two groups of fish.

著者

芳山 拓 坪井 潤一 松石 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

pp.21-00007, (Released:2021-08-25)

参考文献数

38

被引用文献数

1

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遊漁対象種の希少性や生物学的特性の違いに着目し,北海道然別湖,朱鞠内湖および洞爺湖における遊漁者を対象に,遊漁者の満足度と釣果の関係を比較した。その結果,1)希少魚の釣果は1尾の釣果が遊漁者の満足度を大きく高める,2)希少魚の釣果はその魚種が1番の狙いの魚種でなくとも遊漁者の満足度に影響を与えうる,3)大型に育つ遊漁対象種では釣獲尾数よりも体サイズに満足度の主眼がおかれる,4)遊漁対象種に食用としての価値が高い場合,遊漁者にとって満足といえる釣獲尾数はより多くなる,という傾向が明らかになった。

著者

佐々木 系 長谷川 功 八谷 三和

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.1005-1007, 2017 (Released:2017-12-22)

参考文献数

22

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2016年8月30日,台風に伴う河川増水により,岩手県の某河川沿いにある養魚場が冠水し,ギンザケ当歳魚(0+)(推定50万個体)が逸出した。このため,種間関係(競争・交雑等)を通じた生物多様性への影響が懸念され,駆除等の対策を要する。そこで,対策を講ずる基礎的知見を収集するために,ギンザケ逸出後の河川で魚類相調査を行った。ギンザケの生息個体数は6,387個体と推定され,逸出から100日後では逸出時の1.3%に減少していたが,在来種と同所的に存在し,0+で成熟する雄個体がいることが明らかになった。

著者

安 永一 有元 貴文

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.60, no.6, pp.713-718, 1994

被引用文献数

5 6

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The avoidance response of the jack mackerel <i>Trachurus japonicus</i> to a strobe light barrier was investigated in the laboratory, by electrocardiogram measurement.<br> The avoidance response varied with the strobe flash frequency (1.7-430 Hz) and strobe light intensity. Avoidance was greatest at flash frequencies of 5 and 10 Hz and clearly decreased as the strobe light intensity (15 Ix•s) was reduced.<br> Heart rate increased when the fish stayed in the dark section of the tank or approached the barrier, but decreased when fish avoided or passed through the barrier or strobe light. Therefore, heart rate change can be used as an index of fish response to the effect of strobe light stimuli.

著者

松田 勝

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.85, no.2, pp.186, 2019

著者

安元 健 中島 一郎 Raymond BAGNIS 安達 六郎

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.43, no.8, pp.1021-1026, 1977-08-25 (Released:2008-02-29)

参考文献数

7

被引用文献数

201 274

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Experiments were designed to see whether a dinoflagellate, Diplopsalis sp. nov, found in a toxic sample of detritus collected from a ciguatera-endemic area is the cause of ciguatera. The dinoflagellate in the detritus was separated from other materials by means of sedimentation and sieving through sieves of various mesh sizes. Bioassay of the dinoflagellaterich samples thus obtained proved that the toxicity of each sample was proportionally related to the number of the dinoflagellate cells in the sample. Subsequent extraction of the dinoflagellate sample followed by fractionation of the extracts with solvents afforded two major toxins; a diethyl ether soluble toxin and an acetone precipitable toxin. The former toxin was judged to be identical, or closely related, to ciguatoxin, a major toxin in ciguatera, on the basis of various column and thin layer chromatographic properties. A close similarity was also observed between the acetone precipitable toxin and maitotoxin, a secondary toxin isolated from ciguateric surgeonfish. Judging from these results, it was concluded that Diplopsalis sp. nov is very likely to be the cause of ciguatera.

著者

土屋 隆英

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.66, no.5, pp.789-790, 2000-09-15

著者

関口 秀夫 山口 裕一郎 小林 裕

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.48, no.4, pp.499-504, 1982

被引用文献数

1 5

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A giant isopod <i>Bathynomus d&ouml;derleini</i>, captured by the baited trap in the Kumano-nada region, central Japan, was investigated to elucidate its geographical distribution and bathymetric occurrence.<br> <i>B. d&ouml;derleini</i> is distributed mainly at depths from 250m to 550m and completely absent from the traps set in the water shallower than 150m. So these bathynomids are classified as the littoral-bathyal benthos. The abundance of specimens of <i>B. d&ouml;derleini</i> appears to be dependent on the topographic features of bottom.<br> Summing up the informations known to date, <i>B. d&ouml;derleini</i> has not been found from the marginal seas of the northwestern Pacific, and then its geographical distribution accords with the warm Kuroshio Current area along the Pacific coasts of Japan.

著者

山澤 正勝 村瀬 誠 志賀 一三

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.46, no.2, pp.191-195, 1980

被引用文献数

1 2

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As the first step to improve the off-flavor in retorted Kamaboko, the relationship between the quality of raw fish-meat and the production of hydrogen sulfide in retorted Kamaboko, the relationshop between the quality of raw fish-meat and the production of hydrogen sulfide in retorted Kamaboko was investigated. Lizard fish, <i>Saurida undosquamis</i>, white croaker, <i>Argyrosomus argentatus</i>, and frozen Surimi (frozen meat paste made from Alaska pollack, <i>Theragra charcogramma</i>) were popular raw fish for Kamaboko manufacturers and were used as the experimental raw fish.<br> The amount of hydrogen sulfide in retorted Kamaboko increased with an increase in the pH of the washed meat, prepared from raw fish-meat (white croaker) during the ice storage. Irrespective of the species of raw fish, the amount of hydrogen sulfide produced was directly related to the pH of raw fish-meat and increased with the rise of pH, when the pH of raw fish-meat was adjusted with 0.2_N HCI or NaOH.Therefore, it was revealed that the manufacturing condition which reduces the pH of raw fish-meat was effective in inhibiting the pro-duction of hydrogen sulfide in retorted Kamaboko. In addition, it was estimated that for-maldehyde generated from trimethylamine oxide in Alaska pollack and lizard fish played a significant role in inhibiting the production of hydrogen sulfide in retorted Kamaboko.