巻号一覧
64 巻 (1998)
- 6 号 p. 957-
- 5 号 p. 755-
- 4 号 p. 583-
- 3 号 p. 368-
- 2 号 p. 171-
- 1 号 p. 1-
64 巻, 5 号
選択された号の論文の31件中1～31を表示しています
- |<
- <
- 1
- >
- >|
-
安樂 和彦, 松田 宗之, 重里 憲広, 中原 真弥, 川村 軍蔵1998 年 64 巻 5 号 p. 755-758
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーAs a part of a marine ranching project, this study examined responses to tone-bursts of different frequencies by flounder juveniles which had been conditioned to come to a sound source of 300Hz tone-bursts in a fish cage. After completion of conditioning, the flounders showed the conditioned responses to 1s tone-bursts of frequencies of 200-800Hz with a peak sensitivity at 300Hz, and a slight and short response to a continuous sound of 300Hz immediately after the sound projection, coinciding with the previous finding with res sea bream juveniles. The bimodal pattern of sound frequency-pressure threshold concluded that this conditioned response was mediated by the inner ear in response to particle displacement. This pattern, however, was different from a reported audiogram with a peak seak sensitivity at 100Hz, probably because of the effect of frequency of the conditioned sound.抄録全体を表示PDF形式でダウンロード (401K) -
辛 鍾根, 今井 健彦, 不破 茂, 石崎 宗周1998 年 64 巻 5 号 p. 759-767
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーThe purpose of this study is to develop a net design for the stern fishing system of surrounding net using a lampara net. First, experiments were carried out using the model lampara net on the sinking motion under static water condition, and on the closing characteristics of the opening area on the lead line and side shape of the model net under the flow of water.
The sinking speed of the model net was different according to the measuring point on the lead line. The depth of the lead line gradually became shallow as the flow velocity increased. The closed time of the opening area on the lead line was different according to the given flow velocity. When the model net moved about the same length of the float line, the opening area on the lead line was almost closed.抄録全体を表示PDF形式でダウンロード (535K) -
藤井 一則, 吉田 桂一, 白石 学, 丸山 為蔵1998 年 64 巻 5 号 p. 768-774
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーIn order to establish the method for efficient propagation of sturgeon, oocyte diameter, serum vitellogenin (Vg) level, germinal vesicle position (GVP), and in vitro oocyte maturation response to progesterone were examined in bester females (Huso huso female×Acipenser ruthenus male) correlated with their maturation and ovulatory response to hormonal treatment. Serum Vg level and GVP were significantly changed correlated with oocyte growth. Serum Vg level and in vitro oocyte maturation response to progesterone reflected ovulatory response to hormonal treatment. These results suggested that females suitable for artificial propagation can be selected by measuring these factors regularly.抄録全体を表示PDF形式でダウンロード (581K) -
北門 利英, 山田 作太郎1998 年 64 巻 5 号 p. 775-781
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーThe estimation of population size by a tagging experiment including incomplete reports of the number of recaptured tagged fishes is considered. It is assumed that the sample is classified into two classes. In class 1 the reporting rate of recaptured tagged fish is 1, and in class 2 the rate may be less than 1. In this case the Petersen estimator and the Chapman type estimator based on the observation in class 1 (CTE) have been proposed, although large sample in class 1 is not expected. In this paper, we examine the effects of the observation in class 2 as additional information for the estimation of population size. Some estimators which include the observations in both classes, such as the modified maximum likelihood estimator (MMLE), are evaluated in senses of the bias and the mean squared error. As a result, if the sample size in class 1 is small and true reporting rate is high, then the MMLE is preferable to the CTE. In the other case, however, the CTE is superior to the estimators based on the observations in both classes.抄録全体を表示PDF形式でダウンロード (530K) -
小林 徹1998 年 64 巻 5 号 p. 782-791
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーHeat shock treatment for 20min from 15min after insemination suppressed the formation of the second polar body of the normally developed eggs, and the genetic material of the second polar body was retained in the egg. These processes did not result in the formation of a diploidy female pronucleus, but formed some karyomeres. They were tugged with the female pronucleus toward the male pronucleus already present in the center of the sperm aster. Thus, they adhered, and formed a fertilized nucleic group like a cluster of grapes. The genetic inactivated sperm irradiated with ultraviolet rays (UV-sperm) became swollen and formed a male pronucleus after passing through the micropile. It behaved like normal sperm until the connection with the female pronucleus. The paternal genetic material in gynogenetic embryos disappeared during the anaphase of the first cleavage, caused by the incomplete chromosome formation from the male pronucleus, and the paternal DNA remained near the cleavage plane. In the gynogenetic diploid embryo inseminated with UV-sperm, and polyploidized with heat shock treatment, the above mentioned cytological events caused by dual artificial manipulation occurred in the same egg, i.e., the genetic material formed a triploidy nucleus like a cluster of grapes, and a male pronucleus derived from UV-sperm disappeared during the anaphase of the first cleavage. The developmental rate was higher in triploid embryos polyploidized with heat shock, and lower in the gynogenetic haploid embryo than in the normal diploid embryos. In the gynogenetic diploid embryos, the metaphase of the first cleavage occurred at the same time as normal diploid embryos.抄録全体を表示PDF形式でダウンロード (4188K) -
本松 敬一郎, 平石 智徳, 山本 勝太郎, 梨本 勝昭1998 年 64 巻 5 号 p. 792-795
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーAuditory masking was determined for the black rockfish by using white noise as masking stimuli with spectrum levels of around 70, 80 and 90dB re 1 μPa/Hz1/2. The auditory thresholds at four frequencies from 100 to 500Hz varied with background noise, and increased from 10 to 24dB at the highest noise level as compared with thresholds in a quiet condition for each frequency. Values for the critical ratio, calculated in terms of the masked thresholds in relation to masking noise spectrum level, ranged from 27dB at 100Hz to 40dB at 500Hz. The noise spectrum levels that start masking are estimated to be 66-77dB at the test frequencies suggesting that background noise larger than those values affects hearing in the black rockfish. The thresholds are 27-40dB higher than the spectrum level of the noise.抄録全体を表示PDF形式でダウンロード (287K) -
品川 汐夫, 多部田 修1998 年 64 巻 5 号 p. 796-806
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーWe have proposed a practical strategy for analyzing faunal data in the form of species×sites using both the Rsn method and the fuzzy cluster analysis. In the present paper this strategy is applied to detect the change of macrobenthic fauna collected from the estuary tidal flat every August during 14 successive years (1982-1996) except 1991. In this tidal flat reclamation work was begun in 1979 for the construction of a port and related facilities. The Rsn ordination together with the fuzzy cluster analysis reveals six communities and four species groups in this macrobenthic fauna. Using the results of the fuzzy clustering of the species groups, the canonical correlation analysis (CCA) is applied between the number of individuals of each species group and the sediment properties. It clearly shows that contrasting temporal changes of the communities are indicated at the stations located to the north and south of the reclaimed land. Significant data, however, can not be derived from the results of the correspondence analysis (CA), because of the presence of outlier sites and species.抄録全体を表示PDF形式でダウンロード (852K) -
山田 浩且, 津本 欣吾, 久野 正博1998 年 64 巻 5 号 p. 807-814
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーIn order to investigate the cannibalistic mortality of larval Japanese sand eel Ammodytes personatus by adults, the stomach contents of 352 adults collected from Ise Bay in central Japan in March 1995 and February 1996 were observed. Sand eel larvae were found in the stomachs of 22.4% of adults. The average weight of larvae in stomach/adult weight was 0.5%. The relationship between standard length (SL) of adult (SLa in cm) and the maximum SL of larvae (SLmax in mm) was expressed as SLmax=5.1•SLa-22.9. The daily predation rate on the larvae by an adult sand eel was estimated to be 2.1% of its body weight, using the observed weight of the larvae in a stomach and the gastric evacuation rate (0.313h-1) obtained from a laboratory experiment. The total number of larvae which could be preyed on by a pair of 8cm, 10cm, and 12cm SL adults was estimated to be 2, 000, 3, 800, and 6, 400 individuals, respectively, assuming that the period when the spacial distribution of the adults and the hatched larvae in the mouth of Ise Bay are overlaping is ten days. These values were equivalent to 62%, 44%, and 34% of the fecundity of an adult female of 8cm, 10cm, and 12cm SL, respectively.抄録全体を表示PDF形式でダウンロード (647K) -
内田 圭一, 東海 正, 胡 夫祥, 松田 皎1998 年 64 巻 5 号 p. 815-821
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーThis paper presents the mesh selectivity of a net pot for white-spotted conger eel Conger myriaster. A cover-net fishing experiment was carried out in October 1995 and 1996, using five mesh openings; 11.6, 13.6, 15.5, 18.1, and 21.0mm with a cover-net of 10.8mm mesh opening. Each mesh-size net pot had a slightly different mesh selectivity curve in terms of R(=G/P), girth ratio G to mesh perimeter P, although mesh selectivity of four mesh sizes in a small trawl codend was described by a single curve in terms of R. In the net pot, the net was attached to the frame of the pot with some tension. The distortion of mesh shape was probably less than that of the trawl net. Moreover, because the twin diameter of each mesh size net was the same in the experiment, for smaller mesh size the ratio of twin diameter to mesh length was relatively larger. This means that it was a little harder for conger eels to distort the mesh shape while passing through the smaller mesh. Selectivity ranges in terms of R, R75-R25 of net pot were larger than those of the small trawl codend. Conger eels are likely to escape from the pot just during hauling up, because they try to stay inside as long as bait remains. In a towed-trawl cod-end conger eels have more chance of escaping through the mesh, which is another possible reason why the trawl codend has a narrow selectivity range.抄録全体を表示PDF形式でダウンロード (458K) -
北島 力, 山根 康幸, 松井 誠一, 吉松 隆夫1998 年 64 巻 5 号 p. 822-829
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーThe specific gravities of the ayu Plecoglossus altivelis larvae were measured in a series of saline solutions. The volume of swim bladder and wet and dry fish weight were also measured.
After decresasing from 1.038 to 1.032 through the prelarval period, the specific gravity of postlarvae with uninflated swim bladder increased to 1.050. The larvae began to inflate their swim bladder while 15 to 20mm TL during the nighttime and 21 to 35mm TL during the daytime. With inflation of the swim bladder, the specific gravity decreased remarkably and its diel change became to be marked, by day-increase and night-decrease. Buoyancy regulation was effected by the change of the swim bladder volume, which was induced by a photocycle, viz. light-deflation and dark-infla-tion. The gas in the swim bladder originated from the air swallowed at the water surface.
These results suggest that ayu larvae display diel vertical migration, viz. dusk-upward and dawn-downward, similar to several physostomous species such as anchovy and herring.抄録全体を表示PDF形式でダウンロード (650K) -
岩本 明雄, 大河内 裕之, 津崎 龍雄, 福永 辰広, 北田 修一1998 年 64 巻 5 号 p. 830-840
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーThis paper assesses the effectiveness of the annual releases (1987-1992) of flounder evaluated by a census of the commercial landings at the Miyako Fish Market, Iwate Prefecture, from 1988 through 1995, where nearly all the flounders fished in the area adjacent to Miyako Bay are landed. Flounders landed were classified into wild or hatchery released individuals by the difference in the pigmentation on the eyeless side of the body. Total length of all the released and almost all the wild individuals which were landed were measured. And we estimated age composition of released flounder. As a result, from the 611 thousand flounder seeds released from 1987 through 1992, a total of 77, 681 were commercially landed, and a contribution rate of the released flounder to the total landings were between 16.5% and 52.7%. The recapture rate of released seed for each annual release was estimated at between 5.9% and 23.3%, and the ratio of the total landing cash value to the cost of seeds, including personnel and facilities required prior to release were evaluated at between 0.46 and 1.96. We suggest that improvement of the post-release survival rate may significantly improve the economic returns.抄録全体を表示PDF形式でダウンロード (836K) -
浜崎 活幸, 竹内 俊郎, 関谷 幸生1998 年 64 巻 5 号 p. 841-846
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーLarvae of swimming crab were reared in 1-2 l tanks, supplied with marine rotifers cultured with several feeds: baker's yeast, baker's yeast fortified with cuttlefish liver oil, freshwater Chlorella, and marine micro algae Nannochloropsis. The fatty acid compositions of the rotifers were analyzed to evaluate their dietary value. Larval survival, growth and velocity of development were improved according to the amount of n-3 highly unsaturated fatty acids (n-3HUFA) contained in rotifers. Consequently, it was considered that the larval swimming crab demanded the n-3HUFA in feeds as essential fatty acid and enrichment of feed rotifers should be a routine technique in the seed production process of the swimming crab.抄録全体を表示PDF形式でダウンロード (451K) -
大住 幸寛, 川合 正允, 天野 秀臣, 野田 宏行1998 年 64 巻 5 号 p. 847-853
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーOligosaccharide fractions, a neutral fraction NOSP and three anionic fractions OSP3, OSP2, and OSP1, have been obtained from porphyran digested with enzymes of Arthrobacter sp. S-22, and examined for in vitro antitumor activity against WI-38 VA-13 cells. However, they did not inhibit growth of WI-38 VA-13 cells. In contrast, the sulfated disaccharide fraction, OSP1, showed considerable antitumor activity against Ehrlich ascites and Meth-A fibrosarcoma. Furthermore, OSP1 significantly enhanced the phagocytosis of macrophages when intraperitoneally administered.抄録全体を表示PDF形式でダウンロード (751K) -
石原 良美, 齋藤 寛, 森 徳久, 高野 二郎1998 年 64 巻 5 号 p. 854-861
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーFor the purpose of estimation of quality of dried laver Porphyra spp. based on bound water, glucose decomposed from polysaccharide, water-soluble protein, chlorophyll-a, vitamin C, free amino acids and bound water were measured in 31 kinds of dried laver cultured at the same “nori”-farm from 1993 to 1996 at Miyato of Miyagi prefecture. Good correlation was observed between water-soluble protein and chlorophyll-a and between water-soluble protein and bound water as a result of these measurements. All the measured constituents of the dried laver were chosen as the subject of the multiple regression analysis. The results obtained showed that the amount of protein in the dried laver was estimated by the quantity of bound water in statistical probability. Therefore, it is possible to estimate the quantity of protein in dried laver, Porphyra spp. by bound water content.抄録全体を表示PDF形式でダウンロード (551K) -
末綱 邦男1998 年 64 巻 5 号 p. 862-866
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーA peptidic fraction (SP-I) having inhibitory activity against angiotensin I-converting enzyme (ACE) was separated from the peptic digest of protein prepared from the brown alga Hizikia fusiformis by ion-exchange chromatographies and gel filtration. Oral administration of SP-I into spontaneously hypotensive rats at 200mg/kg resulted in a marked hypotensive effect. Further separation of SP-I by ODS HPLC afforded three active peptides, Gly-Lys-Tyr (IC50; 3.92μM), Ser-Val-Tyr (8.12μM), and Ser-Lys-Thr-Tyr (11.07μM).抄録全体を表示PDF形式でダウンロード (351K) -
森岡 克司, 森木 竜也, 伊藤 慶明, 小畠 渥1998 年 64 巻 5 号 p. 867-877
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーProximate, fatty acid, and free amino acid compositions in the muscle of cultured red sea bream fed moist pellet (MP-fish) were compared with those of the fish fed fresh bait (FB-fish). Lipid accumulation in the abdominal cavity of both fish was also examined.
The lipid content in the muscle of MP-fish was almost the same as that of FB-fish. On the other hand, the content of lipid in the abdominal cavity of MP-fish was higher than that in FB-fish. In the fatty acid composition of muscle non-polar lipid, the percentages of C18:1 n-9 and C18:2 n-6 in MP-fish were higher than in FB-fish, while the percentage of C22:6 n-3 was lower in the former than in the latter. Fatty acid composition of muscle non-polar lipid was affected by the bait.
Free amino acid composition was also affected by the bait. The content of Anserine in MP-fish was higher than that in FB-fish, while the contents of Lys, His, and Arg were much lower.抄録全体を表示PDF形式でダウンロード (637K) -
野村 明, 伊藤 慶明, 逢坂 良昭, 北村 有里, 宮崎 裕規, 小畠 渥1998 年 64 巻 5 号 p. 878-884
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーThe separation of a factor, which inhibits the degradation of myosin heavy chain in washed meat paste around 40°C, from the sarcoplasmic protein of fish meats was examined. The factor was extracted easily with water from meat. After the extract was mixed with DEAE-ion exchange resin, the factor was eluted with 0.1 M NaCl solution. On the other hand, when the extract was fractionated by ammonium sulfate, the factor was contained in a 50-70% saturated fraction. Then ammonium sulfate fractionation, after ion exchange treatment, gave an almost single peak chromatogram in gel filtration. The peak was 80, 000-90, 000 in molecular weight and showed no transglutaminase activity. Furthermore, this factor was separated from various kinds of fish meats, that is even from fish meat of which modori at 40°C is not induced by meat washing, which varies in modori behavior.抄録全体を表示PDF形式でダウンロード (4181K) -
山根 猛1998 年 64 巻 5 号 p. 885-886
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (181K) -
釣・陥穽具梨本 勝昭, 井上 悟, 松岡 達郎, 稲田 博史1998 年 64 巻 5 号 p. 887
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (55K) -
清水 晋1998 年 64 巻 5 号 p. 888-889
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (156K) -
平石 智徳1998 年 64 巻 5 号 p. 890-891
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (148K) -
渡部 俊広1998 年 64 巻 5 号 p. 892-893
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (173K) -
西内 修一1998 年 64 巻 5 号 p. 894-895
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (168K) -
上野 陽一郎1998 年 64 巻 5 号 p. 896-897
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (166K) -
大嶋 雄治, 田辺 信介, 橋本 伸哉, 堀口 敏宏1998 年 64 巻 5 号 p. 898
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (60K) -
井口 泰泉1998 年 64 巻 5 号 p. 899-900
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (118K) -
橋本 伸哉1998 年 64 巻 5 号 p. 901-902
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (111K) -
有薗 幸司1998 年 64 巻 5 号 p. 903-904
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (156K) -
大嶋 雄治1998 年 64 巻 5 号 p. 905-906
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (114K) -
堀口 敏宏1998 年 64 巻 5 号 p. 907-908
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (144K) -
田辺 信介, 渡辺 靖二1998 年 64 巻 5 号 p. 909-910
発行日: 1998/09/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (148K)
- |<
- <
- 1
- >
- >|