Effects of spawning temperature on the reproductive characteristics of walleye pollock Gadus chalcogrammus     

Tanaka  Hiroshige  Nakagawa  Toru  Yokota  Takashi  Chimura  Masayuki  Yamashita  Yuuho  Funamoto  Tetsuichiro 《Fisheries Science》2019,85(6):901-911

Fisheries Science - Reproductive characteristics under different water temperature regimes were examined in hatchery-reared walleye pollock Gadus chalcogrammus. The fish had been cultured for...  相似文献   

Japanese eel jaw and vertebra ossification occurring respectively during the larval stage and metamorphosis     

Masuda  Yoshitsugu  Shima  Yasuhiro  Tamaru  Osamu  Takahashi  Yuki  Ohmura  Yoshihiro  Iwasaki  Takashi  Kamoshida  Masaaki  Arimoto  Misao  Yamano  Keisuke  Yatabe  Takashi 《Fisheries Science》2019,85(6):1045-1054

Fisheries Science - Morphological deformities of the jaw and vertebrae arise as hindrances to seed production of Japanese eel Anguilla japonica. To obtain basic information related to development...  相似文献   

Release of dissolved free amino acids from biofilms in stream water     

Sayaka Ishizawa  Yuzo Yamamoto  Takashi Denboh  Hiroshi Ueda 《Fisheries Science》2010,76(4):669-676

We investigated the origin of dissolved free amino acids (DFAA) in stream water focusing on biofilms in the river bed by means of incubation experiments in the laboratory. Stones were placed in the Toyohira River, Hokkaido, Japan, for 3 months, allowing formation of biofilms, and then incubated for 24 h in the laboratory at stream water temperature. After incubation, the composition and concentrations of DFAA in the incubation solution and total hydrolyzed amino acids (THAA) in biofilms were measured by high-performance liquid chromatography. The amount of chlorophyll a (Chl. a) and the number of bacteria were also measured. The DFAA concentration increased greatly in the biofilm incubation solution, but the DFAA composition (mol %) did not change relative to the inception of incubation, where it was similar to stream water. There was no correlation between the increase in DFAA concentration and the THAA concentration, Chl. a amount, or the number of bacteria in biofilms. These results suggest that biofilms are one of the major sources of DFAA in stream water.  相似文献   

Estimating larval supply of Ezo abalone <Emphasis Type="Italic">Haliotis discus hannai</Emphasis> in a small bay using a coupled particle-tracking and hydrodynamic model: insights into the establishment of harvest refugia     

Yoichi Miyake  Shingo Kimura  Tomohiko Kawamura  Takashi Kitagawa  Motoyuki Hara  Hiroshi Hoshikawa 《Fisheries Science》2010,76(4):561-570

Most juveniles of Haliotis discus hannai have been found to be descendants of wild individuals, although most adults were artificially produced (released) individuals as a result of restocking inside the refugium located near the head of Oshoro Bay, Hokkaido, Japan. To estimate the larval supply from released and wild individuals into the refugium and to compare the suitability of locations as larval sources, we simulated larval dispersal using a coupled hydrodynamic and particle-tracking model. The simulation results indicated that more larvae may be supplied from the wild adults inside the bay to the refugium than from the released adults. These results are consistent with the observed high abundance of wild juveniles in the refugium. Most larvae from the refugium were predicted to disperse out of the bay. We found that larval retention in the bay was at least one order of magnitude higher than that in the refugium. Thus, it may be more effective in terms of self-replenishment and reproduction if the refugium were to be expanded to the bay scale. There were only minor differences among the compared sites at the head of the bay in terms of their suitability as larval sources. Consequently, the establishment of new refugia in this area could be expected to provide an effectiveness equal to that of the current refugium.  相似文献   

Multiple taste functions of the umami substances in muscle extracts of yellowtail and bastard halibut     

Yukiko Maruji  Momoko Shimizu  Michiyo Murata  Masashi Ando  Morihiko Sakaguchi  Takashi Hirata 《Fisheries Science》2010,76(3):521-528

Boiled muscle extracts obtained from yellowtail Seriola quinqueradiata and bastard halibut Paralichthys olivaceus were treated with two kinds of purified enzymes (acid phosphatase and glutamate decarboxylase), and the change in contents of nucleotides, related compounds, and free amino acids was examined. The change in taste qualities was also investigated by a taste test. The enzyme treatment resulted in a marked decrease in the contents of such umami substances as inosine 5′-monophosphate (IMP) and glutamic acid (Glu). The taste test revealed that the treatment of these fish muscle extracts with both or either of the enzymes caused a sharp decrease in umami intensity and also an increase in sourness but not a change in pH. The treatment also effected marked decreases in thickness and overall taste intensity. These findings suggest that IMP and Glu function not only to intensify the thickness and overall taste as well as the umami, but also to repress the sourness sensation elicited by the fish muscle extracts.  相似文献   

Fibrous goethite in some soils from Japan and Scotland     

M. Nakai  N. Yoshinaga 《Geoderma》1980,24(2):143-158

Fibrous particles 20—50Å wide and several μm long have been found in the clay fractions from a number of Japanese and Scottish soils. The particles dissolved in buffered dithionite and hot acid oxalate (0.15 M) but were resistant to hot alkali (2% Na₂CO₃, 0.5 M NaOH) and acid (0.1 M HCl) treatments, suggesting a ferruginous and crystalline nature. The ferruginous nature was further indicated by energy-dispersive X-ray spectroscopy, which, at the same time, showed the presence of large quantities of Al and some Si. Electron diffraction analysis indicated goethite of low crystallinity as the most likely mineral. Incorporation of numbers of Al ions in the crystal lattice was inferred from the results of elemental analysis after chemical dissolution treatments.  相似文献   

Erratum to: Biomass and nutrient accumulation by cover crops and upland rice grown in succession under no-tillage system as affected by nitrogen fertilizer rate     

da Silva  Edson Cabral  Muraoka  Takashi  Bastos  Alefe Viana Souza  Franzini  Vinícius Ide  Buzetti  Salatiér  Soares  Frederico Antonio Loureiro  Teixeira  Marconi Batista  Bendassolli  José Alberto 《Journal of Crop Science and Biotechnology》2020,23(3):289-289

Journal of Crop Science and Biotechnology - Due to an unfortunate oversight the author’s name and affiliation have been given erroneously. It should be read:  相似文献   

A single gene transfer of gibberellin biosynthesis gene cluster increases gibberellin production in a Fusarium fujikuroi strain with gibberellin low producibility     

WanXue Bao  Takuya Nagasaka  Shin Inagaki  Sho Tatebayashi  Iori Imazaki  Shin-ichi Fuji  Takashi Tsuge  Masafumi Shimizu  Koji Kageyama  Haruhisa Suga 《Plant pathology》2020,69(5):901-910

Fusarium fujikuroi, the causative agent of bakanae disease in rice, produces many kinds of secondary metabolites. Recently, two phylogenetic subgroups (F and G groups) of Japanese F. fujikuroi have been identified and found to have differences in their gibberellin (GA) and fumonisin production. G-group F. fujikuroi produces large amounts of GA, but is a fumonisin nonproducer. F-group produces large amounts of fumonisin, but is a GA low or nonproducer. We investigated the cause of low GA production in the F-group. Genetic mapping suggests that low GA production in the F-group strain Gfc0825009 is due to a GA gene cluster for GA biosynthesis. Analysis of the nucleotide and amino acid sequences of the genes in the GA gene cluster showed >98.4% homology between the F-group strain Gfc0825009 and the G-group strain Gfc0801001. Following a 7-day culture under low nitrogen conditions, we found that expression of P450-1, P450-4, and P450-2 in the cluster increased in the G-group strain and not in the F-group strain. We hypothesized that complementation by GA genes in the G-group strain would be required to increase GA production in the F-group strain. However, we found that this occurred with a single gene complementation of DES, P450-1, P450-4, or P450-2. Simultaneous increase in the expression of P450-1, P450-4, and P450-2 were detected in the complementary transformants. Moreover, the same phenomenon was observed by reintegration of its own P450-1. Our results suggest the presence of unknown regulatory mechanisms of the GA gene cluster in F. fujikuroi.  相似文献   

Determination of Anthocyanins and Antioxidants in ‘Titanbicus’ Edible Flowers In Vitro and In Vivo     

Chensom  Sasicha  Shimada  Yasuhito  Nakayama  Hiroko  Yoshida  Kumi  Kondo  Tadao  Katsuzaki  Hirotaka  Hasegawa  Sachiko  Mishima  Takashi 《Plant foods for human nutrition (Dordrecht, Netherlands)》2020,75(2):265-271

Plant Foods for Human Nutrition - Titanbicus (TB), a hybrid of Hibiscus moscheutos × H. coccineus (Medic.) Walt., has potential to be used as an edible flower. In this study, proximate...  相似文献   

Liver metabolomic analysis in broiler chicks: Profiling the metabolites after oral administration of l-citrulline     

Vishwajit S. Chowdhury  Yoshimitsu Ouchi  Shogo Haraguchi  Takashi Bungo 《Animal Science Journal》2021,92(1):e13609

Hypothermia is directly linked to metabolism; however, it is still unknown how the overall metabolism is altered by oral administration of hypothermic agent, l -citrulline (l -Cit). The present study aimed to determine the characteristics of liver metabolites of chicks orally administered l -Cit to provide a greater understanding of its metabolism. Capillary electrophoresis–time-of-flight mass spectrometry (CE-TOFMS) and liquid chromatography–time-of-flight mass spectrometry (LC-TOFMS) were conducted on liver samples after oral administration of l -Cit. A total of 361 liver metabolites were identified. Although a small number of samples were used for each group, a principal component analysis and heatmap patterns confirmed that the composition of metabolites could be segregated from each other. Of the 361 compounds detected in the liver, 41 compounds, including amino acids related to the Cit-arginine (Arg) cycle, argininosuccinic acid, Arg, ornithine, and Cit, as well as gamma aminobutyric acid, glycine, histidine, and nicotinamide adenine dinucleotide were abundant in l -Cit-treated livers. In contrast, 24 compounds containing fatty acids, amino acids, and cyclic adenosine monophosphate were lower in the l -Cit group. These data imply that the active Cit-Arg cycle, TCA cycle metabolism, and a low activity in fatty acid metabolism occur in l -Cit-treated broiler chicks.  相似文献