巻号一覧
64 巻 (1998)
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64 巻, 2 号
選択された号の論文の30件中1～30を表示しています
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不破 茂, 大石 卓哉, 石崎 宗周, 今井 健彦1998 年 64 巻 2 号 p. 171-177
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーIn order to analyze the capturing mechanism of pot traps, fish behavior was observed in and around a trap using an underwater TV system. The behavior pattern was classified as follows: (1) appearing in the camera view, (2) swimming towards the entrance, (3) entering inside the funnel, (4) eating the bait, (5) going backward foward the funnel, (6) passing through the inner opening, (7) swimming out of the camera view.
During the 1, 150 min of observed period, total numbers of appearances were 131 times, entering inside the funnel 57 times and capture 3 times, respectively. The puffer swan backward from the funnel by paddling the pectral fins foward the snout of the fish. The capturing mechanism of the fish trap seemed to be affected by the freedom of swimming behavior of puffer fish inside of the funnel.抄録全体を表示PDF形式でダウンロード (427K) -
矢野 和成, 阿部 寧1998 年 64 巻 2 号 p. 178-188
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーThe setting depth of tuna longlines was measured with time-depth recorders (18mm in diameter, 127mm in length, 33.6g in air, 5.0g in water). Two different materials (the main lines and branch lines were either polyamid [nylon] monofilament or polyester multifilament) were used for the longlines (53 were operated in total). The number of hooks used in each hachi (i.e., a unit set of main line) was five, seven, or ten for both longline types. The time-depth recorders were attached to the under end of the branch lines (hook positions) and the under end of the float lines (main line positions). The depth fluctuation of the branch lines could be divided into six types. The float lines showed very little upward and downward movements. The setting depth of the branch lines was shallower than the estimated depth calculated by a catenary curve, especially with the polyamid monofilament gear. Sinking speed on the polyester multifilament gear was faster than that of the polyamid monofilament gear. The depth movments (as recorded via a hachi-attached time-depth recorder) of the longlines that fished for large fishes (e.g., Prionace glauca, Thunnus alalunga, Istiophorus platypterus, Tetrapturus angustirostris, and Coryphaena hippurus) showed significant upward and downward depth fluctuation, especially with the polyamid monofilament gear.抄録全体を表示PDF形式でダウンロード (2141K) -
梶川 和武, 藤石 昭生, 井上 悟, 永松 公明, 濱野 明1998 年 64 巻 2 号 p. 189-196
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーA two-level beam trawl was developed with a square-mesh separator panel in it to separate marketable fish and shrimp from non-commercial crabs and smaller fish. The net-mouth of the lower cod-end in the two-level trawl gear was covered with a square-mesh net panel as a separator. Fishing experiments of the gear were conducted with a chartered trawler off Shimonoseki city in October 1995. Two square-mesh net panels of 40 and 50mm mesh bars were used in the fishing experiments. The net mouth openings of the upper and lower cod-end associated with the efficiency of the separator were measured. The total number of animals caught in 7 hauls was nearly 2, 300. Separation efficiencies defined as the ratio of the catch in the upper cod-end to the total catch of 11 species were compared by two mesh bar sizes. Non-commercial crabs passed through the separator panel and then entered in the lower one, while shrimp were caught in the upper cod-end although its body was enough small to pass through the separator. Separation efficiencies of the main 6 species plotted versus bodysize indicate that the separator has size-selectivity to some extent. Thus, the gear was useful to catch fish of marketable size and shrimp in the upper cod-end.抄録全体を表示PDF形式でダウンロード (674K) -
笠井 亮秀, 坂本 亘, 光永 靖, 山本 章太郎1998 年 64 巻 2 号 p. 197-203
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーAn acoustic transmitter and two micro data recording tags were used to observe the behavior of yellowtails Seriola quinqueradiata, in Sagami Bay, Japan from 24 October through 19 November. Depth data were continuously recorded for 23 days and temperature data for 27 days with a 20-minute interval. The yellowtails showed an apparent diurnal vertical migration pattern in their movements; they crossed the thermocline actively during the daylight hours, but calmed down and remained in the shallow layer above the thermocline at night. Their movements were changed by environmental temperature variation: 1) After the ambient water temperature rapidly decreased, a change was seen in the average depth and pattern in the vertical movement of the yellowtail. 2) They could move vertically to avoid the warm water from the Kuroshio because no ambient temperature rise and no shallower position were observed when the warm water intruded into the bay from the Kuroshio.抄録全体を表示PDF形式でダウンロード (1129K) -
東 輝明, 山田 真知子, 門谷 茂, 広谷 純, 柳 哲雄1998 年 64 巻 2 号 p. 204-210
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーThe development of oxygen-deficient water mass in Dokai Bay was investigated temporally and spatially during the summer of 1994. It was found that oxygen-deficient water mass(<2mg O2/ι) was generated from the bottom layer of the inner part of the bay, and then spread not only vertically toward the surface layer, but also laterally to the middle part of the bay. The oxygen-deficient water mass persisted for about two months and its maximum volume was estimated to be 20% of the whole volume of the bay.
A pycnocline, due to the inflow of river water, was found at the inner part of the bay where the recurrent formation of a red tide resulted in a thin surficial euphotic layer. Such conditions enable the formation of oxygen-deficient water mass expanding from the bottom up to 1.5m below the surface, where wind over 3m/sec prevents this water mass from expanding further vertically. These phenomena of oxygen-deficient water mass in Dokai Bay are different conpared to other eutrophic sea areas in Japan.抄録全体を表示PDF形式でダウンロード (612K) -
張 国勝, 平石 智徳, 本松 敬一郎, 山本 勝太郎, 梨本 勝昭1998 年 64 巻 2 号 p. 211-215
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーThe auditory thresholds for 10 specimens of the marbled sole Pleuronectes yokohamae were determined by heartbeat conditioning using pure tone stimuli of 9 frequencies from 60 to 1, 000Hz, which were coupled with an electric shock. The marbled sole could hear sound in the frequency range from 60 to 1, 000Hz, and the lowest threshold was 92.5dB re 1μPa at 100Hz. Hearing ability declined rapidly with increasing frequency above 300Hz, but little difference occurred in hearing ability between 400 and 500Hz. The results show that the auditory thresholds of marbled sole are higher and its sensitive frequency range is narrower than that for fish that have swimbladder.抄録全体を表示PDF形式でダウンロード (450K) -
クローズド化への展望丸山 俊朗, 鈴木 祥広1998 年 64 巻 2 号 p. 216-226
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (1024K) -
菊池 弘太郎1998 年 64 巻 2 号 p. 227-234
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (1456K) -
不破 茂, 森 宣仁, 石崎 宗周, 藤田 伸二, 今井 健彦1998 年 64 巻 2 号 p. 235-242
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーBurinawa is a long rope equipped with many white painted wooden strips “buriki” and stone weights at regular intervals, and is the main device used in Buriami fishery. The moving performance of the Burinawa, used in the Buriami fishery for catching red sea bream Pagrus major and crimson sea bream Evynnis japonica, was measured by radar on board an anchored training ship. The shape, enclosing area and towing speed of the Burinawa were analyzed. The shape of the Burinawa was U-shaped, reduced in a similar manner with elapsed time, and was affected by the current. The enclosed area decreased almost exponentially. The towing speed of the Burinawa was 0.3kt at the middle and 0.5kt at both ends. The movement of the buriki and the tension of it were measured in a flume tank. Power spectra were estimated from the measurements. A dominant frequency of 1.3Hz was identified at only a flow speed of 0.3kt. From the results of the experiment, it was suggested that the Burinawa drive fish schools by visual and acoustic stimuli.抄録全体を表示PDF形式でダウンロード (452K) -
堀 豊, 宮原 一隆, 長井 敏, 辻野 耕実, 中嶋 昌紀, 山本 圭吾, 吉田 陽一, 荒木 伸生, 酒井 康彦1998 年 64 巻 2 号 p. 243-248
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーThe relationships between the dominant phytoplankton and the water quality factors were examined at seven stations in Osaka Bay and Harima-nada (1995-1996).
Monthly changes of water quality factors in Osaka Bay and Harima-nada showed that DIN (dissolved inorganic nitrogen):DIP (dissolved inorganic phosphorus) and TP (total phosphorus):DIP ratios were high in May and June, while DIN:DIP ratio was low and TN (total nitrogen):DIN ratio was high in August and September.
The relationships between the dominant phytoplankton and the water quality factors were considerably variable and complex. Skeletonema costatum, Pseudonitzschia spp., Rhizosolenia fragilissima, and Eucampia zodiacus occurred in waters with high DIN:DIP ratio (>100), Ceratium furca, Noctiluca scintillans, Prorocentrum micans, Leptocylindrus danicus, Gyrodinium spirals, Mesodinium rubrum, and Prorocentrum triestinum did with moderate DIN:DIP ratio, and Gymnodinium mikimotoi, Rhizosolenia setigera, Chaetoceros curvisetum, and C. affinis did with low DIN:DIP ratio (<10). DIN:DIP ratio in waters where dominant phytoplankton occurred increased with increased TN×TP, TN:TP, and TP:DIP ratios, whereas it did not decrease with increased TN:DIN ratio.抄録全体を表示PDF形式でダウンロード (493K) -
山田 秀秋, 佐藤 啓一, 長洞 幸夫, 熊谷 厚志, 山下 洋1998 年 64 巻 2 号 p. 249-258
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーStomach contents of juvenile Japanese flounders were studied from 3 sheltered and 3 exposed bays. Newly settled flounders (15-20mm in TL) mainly consumed mysids regardless of the availability of food organisms. In sheltered bay areas where mysid densities were low, flounders larger than 60mm preyed mainly on juvenile fish. In exposed inshore areas mysids were abundant and con-stituted the major dietary item of flounder until 200mm. The amount of the stomach contents was not significantly different between the two area types. From monthly investigations it was found that seasonal changes in the feeding activity of juvenile flounders is closely associated with water temperature and mysid abundance. Analysis of the relationship between the total length of flounders (from 15mm to 600mm) and the size and number of prey consumed suggest that small mysid individuals are the most suitable prey items for flounders until 50mm and fish prey items are essential for larger flounders.抄録全体を表示PDF形式でダウンロード (1450K) -
吉田 陽一, 三嶋 義人, 佐藤 正春1998 年 64 巻 2 号 p. 259-263
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーThe relationships between the dominant phytoplankton and the water quality factors were examined at two stations in the inner part of Tokyo Bay.
Monthly changes of water quality factors in the inner part of Tokyo Bay showed that DIN (dissolved inorganic nitrogen): DIP (dissolved inorganic phosphorus) ratio was high in February and March and low in October and November, while TN (total nitrogen): DIN ratio was low in January and February and high in August and September.
The relationships between the dominant phytoplankton and the water quality factors were considerably variable and complex. Skeletonema costatum, Heterocapsa triquetra, Eucampia zodiacus, Chaetoceros didymum, and Chaetoceros radicans occurred in waters with comparatively high DIN:DIP ratio (>80), Ceratium fusus, Ceratium lineatum, Rhizosolenia fragilissima, and Leptocylindrus danicus did in waters with moderate DIN:DIP ratio, and Heterosigma akashiwo, Prorocentrum minimum, Gonyaulax verior, and Chaetoceros debile did in waters with comparatively low DIN:DIP ratio (<50). DIN:DIP ratio in waters where dominant phytoplankton occurred tended to decrease with increased TN×TP and WT.抄録全体を表示PDF形式でダウンロード (388K) -
岸村 栄毅, 林 賢治1998 年 64 巻 2 号 p. 264-269
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPhospholipase A2-like enzyme was purified from the crude extracts of the pyloric caeca of the starfish Solaster paxillatus by heat treatment followed by gel filtration on a Sephacryl S-200, preparative polyacrylamide gel electrophoresis, and gel filtration on a Sephadex G-50.
The final phospholipase A2-1ike enzyme preparation was nearly homogeneous in SDS-polyacrylamide gel electrophoresis, and its molecular weight was estimated to be approximately 13, 000. The enzyme mainly released oleic acid from 1-palmitoyl-2-o1eoy1-sn-glycero-3-phosphocholine. For hydrolysis of egg yolk phosphatidylcho1ine, the optimum pH and temperature of this enzyme were in the range of pH 9-10 and 30-40°C, respectively, and the enzyme was activated by Ca2+. Starfish phospholipase A2-1ike enzyme as well as porcine pancreatic phospholipase A2 did not show the fatty acid specificity for hydrolysis of phosphatidylcholine prepared from scallop adductor muscle.抄録全体を表示PDF形式でダウンロード (945K) -
竹内 俊郎, 石崎 靖朗, 渡邉 武, 今泉 圭之輔, 清水 健1998 年 64 巻 2 号 p. 270-275
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーA feeding experiment was conducted to examine the effect of different docosahexaenoic acid (DHA) content in rotifers on the DHA requirement of larval yellowtail Seriola quinqueradiata during Artemia feeding stages. Rotifers enriched with freeze-dried shark eggs (HR) or Nannochloropsis (LR) having different levels of DHA were given to larvae for 23 days. Each lot of larvae was then divided into three groups, and each group was fed Artemia containing different levels of DHA; 0%, 1.6% and 2.6%, respectively, for 16 days.
Both survival and vitality of larvae during Artemia feeding stages were affected by the DHA levels in rotifers at the start of feeding. It was found that as DHA content in rotifers increased, the DHA requirement of larvae during Artemia feeding stages decreased from 2.6 to 1.6%. When larvae were fed rotifers containing 1.3% DHA followed by Artemia containing 1.6% or 2.6% DHA, healthy larvae were obtained. The survival and vitality of larvae fed on rotifers having a low level of DHA improved by feeding them with Artemia containing 2.6% DHA.
The results indicate that the DHA content in rotifers influences the DHA requirement of larval yellowtail during the Artemia feeding stages.抄録全体を表示PDF形式でダウンロード (530K) -
望月 聡, 乗田 嘉子, 前野 久美子1998 年 64 巻 2 号 p. 276-279
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーThe changes in rigor index, breaking strength, and the concentrations of energy-related compounds during ice storage of the dorsal muscle were investigated for horse mackerel killed by stabbing in the spinal bulb only or by that followed by bleeding. The rate of progress of rigor-mortis in the bleeding group was slower than that in the stabbing group without bleeding. No significant differences were observed in the changing rates of breaking strength, and concentrations of ATP and creatine phosphate until 36 hours after death. K-value from 3 days to 7 days after death had a tendency to be lower in the bleeding group. From these results, it was considered that the bleeding was a useful method for delaying the progress of rigor-mortis.抄録全体を表示PDF形式でダウンロード (314K) -
林 茂群, 潮 秀樹, 大島 敏明, 山中 英明, 小泉 千秋1998 年 64 巻 2 号 p. 280-285
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーThe color tone of cultured red sea bream Pagrus major quickly becomes dark immediately after death, which reduces the commercial value of the fish. The effects of several temperature treatments and different concentrations of K+ on the skin color of red sea bream and on melanosome movements in melanophores were investigated to prevent darkening of the skin color.
Soaking solutions containing 300mmol/ι K+ induced the aggregation of melanosomes in the skin and prevented skin darkening. The aggregation effects were enhanced by storage at low temperatures, such as 0 and 4°C. It is concluded that soaking in solutions containing K+ followed by storage at low temperatures is useful to maintain the vivid skin color of the cultured red sea bream.抄録全体を表示PDF形式でダウンロード (922K) -
景 崇洋, 中山 一郎, 荒木 和男, 浅井 康行, 大池 辰也, 浅井 ちか, 長谷川 一宏, 河村 章人1998 年 64 巻 2 号 p. 286-287
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (815K) -
舞田 正志, 福田 穣, 佐藤 公一, 岡本 信明, 池田 彌生1998 年 64 巻 2 号 p. 288-289
発行日: 1998/03/15
公開日: 2008/02/29
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吉田 陽一, 石田 祐三郎, 福代 康夫, 菅原 庸1998 年 64 巻 2 号 p. 290
発行日: 1998/03/15
公開日: 2008/02/29
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近藤 竜二, 鍵谷 豪, 幸 保孝, 廣石 伸互, 渡辺 眞之1998 年 64 巻 2 号 p. 291-292
発行日: 1998/03/15
公開日: 2008/02/29
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中原 紘之, 中川 功, 長尾 文孝1998 年 64 巻 2 号 p. 293-294
発行日: 1998/03/15
公開日: 2008/02/29
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広石 伸互, 前田 広人, 森本 純司, 谷口 雄三, 今井 俊介1998 年 64 巻 2 号 p. 295-296
発行日: 1998/03/15
公開日: 2008/02/29
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石田 祐三郎, 吉田 陽一1998 年 64 巻 2 号 p. 297-298
発行日: 1998/03/15
公開日: 2008/02/29
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満谷 淳1998 年 64 巻 2 号 p. 299-300
発行日: 1998/03/15
公開日: 2008/02/29
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菅原 庸1998 年 64 巻 2 号 p. 301-302
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (193K) -
中野 伸一1998 年 64 巻 2 号 p. 303-304
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (141K) -
高村 典子1998 年 64 巻 2 号 p. 305-306
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (169K) -
朴 虎東, 沖野 外輝夫1998 年 64 巻 2 号 p. 307-308
発行日: 1998/03/15
公開日: 2008/02/29
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吉田 陽一, 中原 絋之, 藤田 裕子1998 年 64 巻 2 号 p. 309-310
発行日: 1998/03/15
公開日: 2008/02/29
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橋谷 博1998 年 64 巻 2 号 p. 311-312
発行日: 1998/03/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (122K)
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