巻号一覧
62 巻, 1 号
選択された号の論文の33件中1～33を表示しています
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岸本 幸雄, 旗持 和洋, 前田 広人1996 年 62 巻 1 号 p. 3-11
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーThe vertical mixing of water within a water column by an underwater mixer to prevent freshwater algal bloom (freshwater red tide) by dinoglagellate, Peridinium bipes was studied at Tonoyama reservoir in the Kii Peninsula. A mesocosm was created by enclosing water of the reservoir with water-proof vinyl sheet fences. Water conditions, such as water temperature and DO, were kept uniform throughout the mesocosm by the vertical water flow generated with the underwater mixer. In the summer of 1993, the usual large freshwater algal bloom did not appear in the reservoir due to the unusually cold temperature, high rainfall and repeated large volume discharges. We had to conduct this experiment at low P. bipes cell densities; however, a comparison of the cell density in the mixing area with those in the control area and outside of the mesocosm indicated a suppressed reproduction rate.抄録全体を表示PDF形式でダウンロード (1499K) -
橋本 新, 平石 智徳, 鈴木 健吾, 山本 勝太郎, 梨本 勝昭1996 年 62 巻 1 号 p. 12-16
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーSwimming speed-fatigue tests were conducted to understand the performance ability of bastard halibut Paralichthys olivaceus. In a small circular tank, a polyethylene net was set on a slant and the fish was put onto the net with its blind side facing a water current. Fish of 4.6 to 36.3cm in total length (L) were classified into 5 size groups and fatigue time was measured at 5 water temperature ranges. Fatigue time, defined as the length of time for a caudal fin to touch the metal grating at the downstream end of the working section of the tank, was measured by the changes in the current velocity (V). Swimming ability index (SAI=∫36000V•L-1dt×10-4) was calculated. For comparison, a fatigue test was also done on barfin flounder Verasper moseri. For bastard halibut, fatigue time was longer in higher temperatures with smaller fish having a higher performance in SAI at the same temperature. At 17°C, fatigue time was estimated over 3 hours in 1 L/s; and a few minutes in 2 L/s. Barfin flounder showed a higher performance than bastard halibut.抄録全体を表示PDF形式でダウンロード (342K) -
渡辺 健一, 沼知 健一, 城 泰彦, 上田 幸男1996 年 62 巻 1 号 p. 17-22
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーSexual maturity, spawning season and sex ratio in the two sibling species of flatfish, genus Pleuronichthys, Honmeita and Bakemeita were surveyed. Spawning season in the Honmeita was estimated to be from the middle of November to the beginning of January, while the Bakemeita was estimated to be from the middle of January to the beginning of May. The Existence of seasonal isolation in the spawning season between the two forms was distinctive. However, there remained the possibility of reciprocal crossing between the two forms in January, because the period in which mature males with fully matured testis were observed was much longer than the spawning season. In this report, the existence of another reproductive isolation mechanism, such as geological isolation of spawning ground, is suggested, considering the absence of heterozygous variants of these two forms in isozyme analysis and the lack of common mtDNA haplotypes between the two forms.
Differences in the sex ratio were also demonstrated between the two species. The sex ratio of Honmeita and Bakemeita were 1.5 and 1.0 respectively.抄録全体を表示PDF形式でダウンロード (1619K) -
渡辺 健一, 沼知 健一, 上田 幸男, 石田 陽司1996 年 62 巻 1 号 p. 23-27
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーMorphological differences between the two forms of Pleuronichthys were investigated. These two forms, Honmeita and Bakemeita, were clearly distinguished by comparing the arrangement of scales on the right side of the body. Scales were arranged regularly in a line on the central part of the right body side in the Honmeita, but were arranged irregularly in the Bakemeita except near the lateral line.
The mean numbers of precaudal vertebrae, dorsal fin rays, anal fin rays, caudal fin rays and upper gill rakers of nine meristic characters examined were different at a statistically significant level between the two forms. The relative growth of various body parts to the body length, such as body height, diameter of eye, depth of caudal peduncle, length of caudal peduncle, height of longest dorsal ray, length of longest pectral ray and length of longest anal ray were significantly different between the two forms. Branching of the lateral line under the base of the dorsal fin was observed in 9.2 percent of Honmeita, and 84.4 percent of Bakemeita.
The complete differences in the arrangement of scales and the statistical differences in these morphological characters provide evidence of the distinctiveness of the two forms as the species.抄録全体を表示PDF形式でダウンロード (430K) -
松石 隆, 岸野 洋久, 菅野 泰次1996 年 62 巻 1 号 p. 28-31
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーWhen age-length data are estimated from growth rings on scale or otolith of fish, a ring-skipping error may be caused by skipping some illegible rings. This error will cause bias in the estimated parameters of growth function. In this study, we developed a maximum likelihood estimation method to estimate the growth parameters and occurrence probability of skipping-error from age-length data, which is obtained from measuring the same individual twice independently. We also examined the bias and accuracy of the method using a simulation technique. When skipping error was considered in the estimation, the bias and the root mean square error of the estimate became smaller than the estimate when skipping error was not considered. This method was robust against the measurement error for the growth function including age-length data.抄録全体を表示PDF形式でダウンロード (272K) -
大富 潤, 清水 誠1996 年 62 巻 1 号 p. 32-39
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーThe Japanese mantis shrimp, Oratosquilla oratoria (De Haan), is one of the main target species for small-scale trawlers in Tokyo Bay. In order to take appropriate fisheries management measures, it is required to evaluate precisely the present condition of 0. oratoria stock. In this study, we examined the change in composition of the market size categories of this species using monthly landing data from 1977 to 1989 and evaluated the present fishing intensity to the stock based on the fisheries and biological parameters determined by the authors previously.
Analyses showed that the percentage of large market size categories especially in summer to total landings has declined, but this is due to the increase of total landings containing small individuals because of the increased upper limit of landings by one fishing vessel per day. A decrease of absolute landings of large market size categories was not confirmed. Judging from the stock assessment using both the yield isopleth diagram and results of biological analysis (calculation of the rate of decrease of spawning adults), the present fishing intensity for O. oratoria stock in Tokyo Bay was at around the optimum level.抄録全体を表示PDF形式でダウンロード (640K) -
藤枝 繁, 森 隆, 山中 有一, 松野 保久1996 年 62 巻 1 号 p. 40-45
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーUsing a classical respiratory conditioning technique, this experiment was carried out to examine the possibility of using a piezoelectric sensor (Kynar; 20mm long, 0.2mm thick) to observe a conditioned response. We used 2 fishes of different body style, the bastard halibut Paralichthys olivaceus and the tilapia Tilapia niloticus. The sensor was fitted on a gill cover to detect the respiratory activity, opening and shutting motion. The heart-beat was detected by ECG. After classical conditioning, the conditioning response was measured as suppression both in the respiratory activity and the heart-beat. The two factors coincided with each other. The method of measuring the respiratory activity by the piezoelectric sensor was found to be very useful for measuring the auditory threshold because of its ease of operation, apparent response and greater signal than that of the ECG.抄録全体を表示PDF形式でダウンロード (468K) -
栄 研二, 海野 徹也, 高原 泰彦, 荒井 克俊, 中川 平介1996 年 62 巻 1 号 p. 46-50
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーYearling ayu Plecoglossus altivelis collected in June and July from the Ohta River were biologically and biochemically examined in comparison with annual ayu caught in the same area.
All the yearling ayu were female. The yearlng ayu were different in size and skin color from the annual ayu, but not different in anatomical parameters such as hepatosomatic index, intraperitoneal fat body ratio, and gonadosomatic index. The ovaries of annual ayu were immature and included chromatin nucleolus and perinucleolus stage eggs, but those of yearling ayu consisted mostly of abortive eggs and a few chromatin nucleolus and perinucleolus stage eggs.
The yearling ayu had less muscle protein but more triglycerides than annual ayu. Fatty acid composition of muscle triglycerides in the yearling ayu was not different from that of the annual ayu. Low protein accumulation caused by depression of protein metabolism would affect the viability of yearling ayu after July.抄録全体を表示PDF形式でダウンロード (337K) -
杉本 裕司, 不破 茂, 石崎 宗周, 今井 健彦1996 年 62 巻 1 号 p. 51-56
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーThe ingress and escape behavior for a fish trap was studied through experiments in the laboratory using green fish Girella punctata. The fish behavior for a simplified funnel set in the aquarium was recorded on video tape. An index of structure for various sizes of funnel-shape entrances was introduced as a means of analyzing the entrapping difficulty. The following results were obtained: The number of fish entrapped was constant when the index was less than 1.0, but decreased when the index increased above 1.0, while the number of escaped fish decreased slightly as the index increased.抄録全体を表示PDF形式でダウンロード (405K) -
酒井 久治1996 年 62 巻 1 号 p. 57-61
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーInverter driven electric winding devices were devised to wind tuna long line using mono-filament nylon continuously. The system devices were a dancer roller device, electric motor driven winder, inverters, synchro generator, and signal adder. Test were conducted to evaluate the mechanical characteristics of this system.
The results show that the operating rango of the dancer roller device is kept to within an allowable range when operating at a line speed of 1.5m/s, whem increasins from 0 to 0.5m/s rapidly. The objective of synchronized operation with the line hauler was fully satisfied.抄録全体を表示PDF形式でダウンロード (324K) -
竹村 明洋, 兼松 正衛, 岡 雅一1996 年 62 巻 1 号 p. 62-67
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーVitellogenin (VTG), a female-specific protein, was purified from the plasma of estrogen-injected greater amberjack, Seriola dumerili, and detected in the skin mucus of females immunologically, in order to utilize it for the early sex distinction of this fish. VTG purified with hydroxylapatite and gel filtration (Sephacryl S-300) had an apparent molecular weight of 430, 000. When enzyme-linked immunosorbent assay was carried out in the sera and mucus of both sexes using rabbit antibody raised against VTG, the serum and mucus of the matured females reacted with the antibody but not those of the matured males. The females during the spawning season (May) had much VTG in their mucus but not males. Some fish before the spawning season had VTG in the muccus and serum. These results suggest that VTG occurs in the mucus of the females and can be utilized for the early sex distinction of this fish.抄録全体を表示PDF形式でダウンロード (1006K) -
宮下 和士, 青木 一郎, 稲垣 正1996 年 62 巻 1 号 p. 68-72
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーWe examined two methods for acoustical estimation of zooplankton abundance using the high-pass sphere model and two frequencies. Frequencies were 50 kHz and 200 kHz. In Method 1, the body length of the zooplankton, which is necessary to estimate the biomass density, was derived theo-retically from the difference of volume back-scattering strength (SV) at two frequencies. In method 2, this information was obtained by actual net sampling. Method 1 was useful to estimate size and bio-mass approximately in the survey area. Method 2 was useful to estimate biomass closely when biolog-ical compositions were simple. Both methods can be applied to acoustic observations of macro zooplankton by common echo sounders mounted on research vessels.抄録全体を表示PDF形式でダウンロード (428K) -
稲田 博史, 廣川 純夫, 谷津 明彦1996 年 62 巻 1 号 p. 73-77
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーExperimental daytime jigging operations were conducted to examine the effect of underwater fishing light for large-size neon flying squid (>30cm mantle length) in the North Pacific Ocean with 3 research vessels. Using underwater fishing lights set at a depth of 180m and 4 jig-lines operated within a depth of 300m by each R/V, only the target species was caught in the operation. The condition of switching the underwater fishing light on and off was assigned systematically to each R/V and time of day. The underwater fishing light was found to have a significant-effect on the squid catch from the results of simultaneous operation with 3 R/Vs between 90min and 30min before sunset.抄録全体を表示PDF形式でダウンロード (374K) -
松下 吉樹, 井上 喜洋, Anatoly. I. Shevchenko1996 年 62 巻 1 号 p. 78-82
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーMesh selectivity experiments were carried out using single and double codends in order to reduce the capture of small sizes of fish by northern trawlers in the Pacific coast of the Kuril Islands in September 1991. The mesh selectivity of the single codend was compared with that of the double codend commonly used in the experimental area. The estimated selection curves indicate the double codend has a for lower mesh selectivity for Walleye pollack and flounders than the single codend. It is suggested from underwater observations by video camera that the overlapped meshes decrease the mesh area, resulting in the low efficiency of mesh selection. From the results obtained the single codend of the presently employed mesh size is desirable to release undersized fish.抄録全体を表示PDF形式でダウンロード (1065K) -
浜田 武士, 山下 成治, 見上 隆克, 橋本 忍1996 年 62 巻 1 号 p. 83-88
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーImprovement of production efficiency in the thinning and ear hanging work of scallop aquaculture has long been required, since the work involves processing a huge number of scallops in a certain season, and is the most, labor-intensive part of the scallop production.
Through analytical investigations of the work, it was found that variations in process planning greatly affect the productivity of the work.
This paper describes the results of analytical investigation of process planning using the concept of line-balancing and the efficiency of combining work elements or minimizing balance-delay. The estimation results for several process planning using the measured standard work time for each work element are also given. The results show that the optimum process planning with high productivity can be estimated, and that by selecting the number of workers at each work station, higher productivity could be achieved.抄録全体を表示PDF形式でダウンロード (462K) -
山下 浩史, 海野 徹也, 中原 周作, 岡田 賢治, 中川 平介1996 年 62 巻 1 号 p. 89-93
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーBlack sea bream Acanthopagrus schlegeli having 42mm in body length as seed for release project were compared with the same size of wild fish. Hatchery-produced fish had shorter intertinal length and higher lipid reserves in muscle, hepatopancreas, and intraperitoneal fat body compared with wild fish. Lipogenic enzyme activities of liver, glucose-6-phosphate dehydrogenase (EC 1.1.1.49) and 6-phosphogluconate dehydrogenase (EC 1.1.1.44) showed a tendency to be higher in hatchery-produced fish. The different intestinal length and lipid metabolism which were caused during rearing conditions would be associated to seed quality for the release project.抄録全体を表示PDF形式でダウンロード (402K) -
松川 雅仁, 平田 史生, 木村 省二, 新井 健一1996 年 62 巻 1 号 p. 94-103
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーFrozen surimi from walleye pollack was ground with 2.5% NaCl in the presence and absence of 0.1-0.65% Na-pyrophosphate (PPi-Na) and made up to become the same pH and ionic strength with small amount of NaOH and NaCl. The salt-ground meats containing 0-0.65% PPi-Na were then incubated at 20°C for setting, followed by heating at 90°C for 20 minutes.
The Effects of pH, ionic strength, or PPi-ion caused by the addition of PPi-Na on gelling properties and cross-linking of myosin heacvy chain (HC) in the gels were examined. From the relation between breaking strength and breaking strain of the setting-heating gel, the softness of the gel was evaluated as the force (g) required to peretrate a half-maximal distance (1.0cm).
It was thus shown that the softness of gel given by the addition of PPi-Na was developled largely through the action of PPi-ion but not through the elevation of pH and ionic strength.
Meanwhile, the rate of the cross-linking reaction of myosin heavy chain in the salt-ground meat was accelerated by the elevations of pH and ionic strength, whereas the PPi-ion suppressed the same reaction.
These results suggested that the role of PPi-Na on improving the gel-forming ability of salt-ground meat is the result of a combination of two separate functions of PPi-Na addition.抄録全体を表示PDF形式でダウンロード (680K) -
今井 千春, 塚正 泰之, 杉山 雅昭, 峯岸 裕, 志水 寛1996 年 62 巻 1 号 p. 104-111
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーThe relationship between breaking strength and ε-(γ-glutamy1) lysine (ε-(γ-Glu) Lys) crosslink content of salt-ground meat sols incubated at a fixed temperature ranging from 25°C to 50°C of sardine and Alaska pollack was examined. At 35°C and below, a positive correlation was found between breaking strength and ε-(γ-Glu) Lys crosslink content of gels obtained by setting of both fish species, and ε-(γ-Glu) Lys crosslink formation accounted for most of the setting of sardine meat sols, while the contribution of ε-(γ-Glu) Lys crosslink formation to the gelation reduced in proportion to the rise of temperature in the setting gel of Alaska pollack. Moreover, ε-(γ-Glu) Lys crosslink formation at 40°C and over had hardly any effect on the breaking strength of both fish species.抄録全体を表示PDF形式でダウンロード (1080K) -
舩津 保浩, 加藤 登, 新井 健一1996 年 62 巻 1 号 p. 112-122
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーSalt-ground meat was incubated at 25°C. During the setting, the meat was solubilized into 0.80 M NaCl solution, and the salt-soluble protein was analyzed by gel filtration together with SDS-PAGE.
Sepharose CL-4B gel filtration separated the fresh salt-soluble protein into 3 fractions, namely Fl, F3, and F4. The protein constituents in the fractions of Fl, F3, and F4 were identified as aggregate of actomyosin complexed with all other components, aggregate of myosin with actomyosin, and actin with a small amount of tropomyosin, respectively.
With the progress of setting, the F3 fraction quickly disappeared and a concomitant large increase in F1 fraction and a small increase in F4 fraction were observed. Moreover, the protein composition in the F1 fraction varied with the setting time, although a major component in the fraction remained unaltered as cross-linked myosin heavy chains.
The results supported our previous conclusion that the actomyosin in salt-ground meat is rapidly complexed with all other protein components to form a huge aggregate of large molecular size during setting.抄録全体を表示PDF形式でダウンロード (1999K) -
河口 克己, 里見 弘治, 横山 理雄, 石田 祐三郎1996 年 62 巻 1 号 p. 123-128
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーA polysaccharide (BS-1) produced by a bacterium Klebsiella sp. isolated from river water had promising properties as an emulsifier and stabilizer. The autooxidation of soybean oil in emulsion systems was studied in the presence of BS-1.
Peroxidation of the oil in the emulsion systems was inhibited by BS-1. The antioxidative effect of 0.5% BS-1 was greater than of an equal cncentration of soybean lecithin and comparable to that of 0.2% ascorbic acid. BS-1 had no hydrogen-donating activity, but Fe2+-binding activity was concentration-dependent; 1.2mM Fe2+ was chelated to 0.25% BS-1. These results suggest that BS-1 suppresses soybean oil peroxidation by encapsulation to isolate the oil from the surrounding matter and by inactivation of metal ions such as Fe2+.抄録全体を表示PDF形式でダウンロード (416K) -
舞田 正志, 立木 宏幸, 貝原 聡彦, 坂脇 玲子, 池田 彌生1996 年 62 巻 1 号 p. 129-130
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (129K) -
坂本 亘, 内藤 靖彦, 塚本 勝巳1996 年 62 巻 1 号 p. 131
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (52K) -
梨田 一也, 内藤 靖彦, 中野 和民, 岩尾 香1996 年 62 巻 1 号 p. 132-133
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (152K) -
佐藤 克文1996 年 62 巻 1 号 p. 134-135
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (161K) -
荒井 修亮1996 年 62 巻 1 号 p. 136-137
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (179K) -
上田 宏, 帰山 雅秀, 栗原 堅三, 山内 晧平1996 年 62 巻 1 号 p. 138-139
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (201K) -
松宮 義晴1996 年 62 巻 1 号 p. 140-141
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (209K) -
牧之段 保夫1996 年 62 巻 1 号 p. 142
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (80K) -
牧之段 保夫1996 年 62 巻 1 号 p. 143-144
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (1418K) -
山下 倫明1996 年 62 巻 1 号 p. 145-146
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (105K) -
原 研治, 石原 忠1996 年 62 巻 1 号 p. 147-148
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (157K) -
関 伸夫1996 年 62 巻 1 号 p. 149-150
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (161K) -
木下 政人1996 年 62 巻 1 号 p. 151-152
発行日: 1996/01/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (153K)
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