• The 12th Meeting Aquaculture Departments of IFRO and it's dependent Centers

      Sahhafi, H.H.; Jamili, Sh.; Matinfar, A.; Mazloomi, M.; Moazedi, J.; Gharra, K.; Hosseini, M.R.; Hasanniya, M.R.; Abdolhai, H. (Iranian Fisheries Science Research InstituteTehran, Iran, 2007)
      Without abstract.
    • 17, 20 α Dihydroxy Progesterone (17, 20 α DP) production by different tissue in Common Carp (Cyprinus carpio) and Gold Fish (Carassius auratus)

      Ebrahimi, M. (1999)
      Different tissue (muscle, heart, eye, testis and blood) and sperm from Common carp and Gold fish, in order to evaluate activity of 20α hydroxy steroid Dihydrogenase (20α HSD) enzyme to convert radioactive 17α HP and amount of 0.01, 1 or 10 mg of nonradioactive hormones, were studied. Converting of substra to 17, 20α DHP was more than 30% in 100mg of eye, heart and testis tissue, 12% in 20cc blood and 18% in 20cc sperm, but it was less than 5% in 100 mg of muscle tissue. 17, 20α DHP was the only metabolite in non gonadal tissues incubations no significant enzyme activity was found in lense-eyeball fluid and retin of common carp. Possible relationship between 20α and 20β dihydroxy steroid dehydrogenase enzymes in fish, 20 hydroxy steroid dehydrogenase and aldo and Keto reductase enzymes has been discussed.
    • 17, 20 α dihydroxy progesterone (17, 20 α DP) production by different tissue in common carp (Cyprinus carpio) and gold fish (Carassius auratus)

      Ebrahimi, M. (1999)
      Different tissue (muscle, heart, eye, testis and blood) and sperm from Common carp and Gold fish, in order to evaluate activity of 20α hydroxy steroid Dihydrogenase (20α HSD) enzyme to convert radioactive 17α HP and amount of 0.01, 1 or 10 mg of nonradioactive hormones, were studied. Converting of substra to 17, 20α DHP was more than 30% in 100mg of eye, heart and testis tissue, 12% in 20cc blood and 18% in 20cc sperm, but it was less than 5% in 100 mg of muscle tissue. 17, 20α DHP was the only metabolite in non gonadal tissues incubations no significant enzyme activity was found in lense-eyeball fluid and retin of common carp. Possible relationship between 20α and 20β dihydroxy steroid dehydrogenase enzymes in fish, 20 hydroxy steroid dehydrogenase and aldo and Keto reductase enzymes has been discussed.
    • 17α-Hydroxy-4-pregenen-3-one (17 αP) assay, using acetylcholinesterase enzyme as tracer

      Ebrahimi, M. (2005)
      17a-hydroxy-4-pregnen-3-one (17aP) hormone is a precursor of other steroid hormones and radioimmunoassay has already been used to measure it, but a simple and rapid "Enzyme Linked Immunosorbant Assay" (ELISA) is described and validated here. A general procedure for prepara-tion of the acetylcholinesterase labelled steroid is described, which is applicable to any steroid. Use of acetylcholinesterase tracer increased the sensitivity of assay so that reliable measurements of each steroid could be achieved with only 10 ml of plasma. The ELISA was applied to measure 17, 20a-hydroxy-4-pregnen-3-one (17, 20aP) steroid production from 17aP by 20 a-hydroxy steroid dehydrogenase (20a-HSD) from sperm of roach (Rutilus rutilus). The results showed that cyprinid sperm contains potent and active 20a-HSD enzymes which produce 17, 20aP hormone from 17aP substrate.
    • 17α-hydroxy-4-pregenen-3-one (17αP) assay, using acetylcholinesterase enzyme as tracer

      Ebrahimi, M. (2005)
      17α-hydroxy-4-pregnen-3-one (17αP) hormone is a precursor of other steroid hormones and radioimmunoassay has already been used to measure it, but a simple and rapid "Enzyme-Linked Immunosorbent Assay" (ELISA) is described and validated here. A general procedure for preparation of the acetylcholinesterase labelled steroid is described, which is applicable to any steroid. Use of acetylcholinesterase tracer increased the sensitivity of assay so that reliable measurements of each steroid could be achieved with only 10 ml of plasma. The ELISA was applied to measure 17, 20α-hydroxy-4-pregnen-3-one (17, 20αP) steroid production from 17αP by 20 α-hydroxy steroid dehydrogenase (20α-HSD) from sperm of roach (Rutilus rutilus). The results showed that cyprinid sperm contains potent and active 20α-HSD enzymes which produce 17, 20αP hormone from 17αP substrate.
    • 1:1,000, 000 bathymetric charts " Hokkaido"," North-East Nippon" and submarine topography.

      Yashima, Kunio; Imai, Kenzo; Nishizawa, Kunikazu (1982)
      The Hydrographic Department of Japan (Nippon) is planning to publish a 1: 1,000,000 bathyrnetric chart series which covers the continental margin around Japan in five sheets. Of those sheets planned, two sheets (“HOKKAIDO" and “NORTH”EAST NIPPON”) have already been published. This bathymetric chart series is the first one to represent the details of the continental margin including trenches and back arc basins around Japan by 100 meter-interval depth contours, and from this viewpoint, may have historical significance on the history of bathymetric chart preparation in Japan. Taking this opportunity, the authors tried to discuss the basic specifications of preparing this series, and to summarize the characteristic submarine topography covered by the two sheets by way of regional description. The basic specifications discussed are as follows: The overall publication plan, expression of data control, projection, graticule and graduation, depth contours and soundings, representation of land features, nomenclatures and geographical names of sea bottom features and color expression are presented. Submarine topography of the sea area studied is divided into three provinces by characteristics and origin. 1. Japan Sea side (Hokkaido,North-East Nippon) 2. Sea of Okhotsk side (Hokkaido) 3. Pacific Ocean side (Hokkaido,North-East Nippon) In the present paper, the characteristics of submarine topography (continental shelf, continental slope, continental borderland, deep sea basin, trench and others) based on the. results of morphometry and reference, were first described for each province, and then problems relating to the origin of the Japan Sea, deep continental shelf, old sea level, wave-like distribution of continental shelf edge, origin of deep sea plains, etc., were additionally discussed.
    • 20 m-type hydrographic survey vessel “ HAMASIO”.

      Shimizu, Keiji; Shimohira, Yasunao (1992)
    • 200 mile Exclusive Economic Zone and fishery development in Sri Lanka

      Joseph, L. (1984)
      Following details of the marine fishery resources of Sri Lanka, prospects for fishery development with respect to the 200-mile Economic Zone are examined, outlining also the 5-year fisheries development plan (1979-83).
    • 27 m-type hydrographic survey vessel HAMASHIO,

      Yoshizawa, Makoto; Sumiyoshi, Masanao; Nagano, Katsuyuki; Odomari, Rihachi; Ida, Souta; Umegaki, Hiroshi; Hatakeyama, Yutaka; Abe, Shuhei; Tsukamoto, Mayumi (2019)
      This paper reports on the outline of the S/V HAMASHIO commissioned in March, 2018.
    • 3 D-magnetic structure model of Io To

      Koyama, Kaoru; Sasahara, Noboru; Koichi, Kumagawa; Onodera, Ken-ei; Kubota, Ryuji (2008)
      We report on the 3 D‐magnetic structure model of Io To based on the airborne geomagnetic surveys in January 2007 and December 1998. We used a 3 D‐magnetic tomography inversion method where the volcanic edifice was sliced into three horizontal layers (above 250m, 250 ‐ 750m, 750 - 2500m in depth) and horizontally divided into prisms with a mesh size of1km ×1km. We assumed that each prism possessed a homogeneous magnetization, and analyzed the intensity of the magnetization of each prism using a conjugate gradient method for calculation. The result showed a characteristic feature that the magnetization intensities in the central part of layers 2 and 3 are lower than a circumference part. The result may suggest participation of magma.
    • 3-D image processing of sea beam bathymetric data.

      Asada, Akira (1986)
      A digital sounding system of good performance,called the Sea Beam, has been introduced and a sounding data processing system which can draw contour maps by computer processing has been prepared by the Hydrographic Department of Japan. The Sea Beam is a swath survey system with 16 narrow beams, which can survey the topography of the seafloor in detail, and give accurate data on depth and relative position between depth points. Up to this time, contour mapping has been used as a representative expression method of seafloor topography. However, it is difficult to catch the delicate topographical features from such contour maps. In recent years three-dimensional expression of the topography has been used by means of computer processing. The technique adopted projects three-dimensional topography from various directions onto flat sheets. View maps are generally drawn by stream lines or meshes. However, the view maps have limits in expressive resolution, so they are not always 'suitable for fine topography. The author developed a method which expresses topography of the seafloor delicately, by using precise Sea Beam bathymetric data. The 3-D Image processing program expresses the topography of the seafloor with shade and color-coded depth contours, with the aid of an ink-jet scanning color plotter. The efficiency of 3-D image processing is confirmed by the application of the practical Sea Beam data in the area from the Sagami Trough to the Izu-Ogasawara Trench, which was surveyed by the Hydrographic Department in 1984 and 1985.
    • 3D bathymetric image along the Japan Trench based on 150 meter grid DEM

      Izumi, Noriaki; Horiuchi, Daishi; Nishizawa, Azusa; Kido, Yukari; Nakata, Takashi; Goto, Hideaki; Watanabe, Mitsuhisa; Suzuki, Yasuhiro (2012)
      It is very regretful that we could not start our project on submarine active faults along the Japan Trench before the devastating Mw 9.0 Tohoku−Oki earthquake on March 11, 2011. Fundamental information for prediction of large earthquakessuch asthedetailed distribution of activefaultswasnotwellknown mainly due to lack of data regarding seafloor topography. To make a more precise submarine active fault map along the trench, we have made detailed seafloor topographic images based on 0.002 degree (about 150m)DEM processed from the original data obtained by Japan Coast Guard and JAMSTEC. Then we have produced anaglyph images of seafloor topography forinterpretationofactivefaults,similarinmannertohowweuseair−photostereosetsforinlandactivefaultinterpretation. Active fault distribution along and around the Japan Trench is rather simple compared with that of the Nankai Trough and/or the southwestern part of the Kuril Trench. As mapped by a previous work(Research Group for Active Faults of Japan, 2001), there are trench−parallel north−dipping thrusts. One of the extensive thrusts extends from off−Sanriku to off−Ibaraki for over 500km, and is probably related to the source fault of the 2011Tohoku− Oki earthquake. Numerous normal faults are depicted on the outer−riseslopeand they are generally short, and may cause M 7 class earthquakes.
    • 3D bathymetric image along the Sagami Trough and the Boso Triple Junction area deduced from150 meter grid DEM.

      Izumi, Noriaki; Nishizawa, Azusa; Horiuchi, Daishi; Kido, Yukari; Nakata, Takashi; Goto, Hideaki; Watanabe, Mitsuhisa; Suzuki, Yashiro (2013)
      We have made detailed anaglyph images based on 150m DEM processed from the original data obtained by Japan Coast Guard and JAMSTEC, in order to analyze submarine topography for more precise interpretation of submarine active faults than that mapped by previous workers along the Sagami Trough and the Boso Triple Junction area. Younger fault escarpments on the both sides of northern part of the Sagami Trough in the Sagami Bay suggest their historical activities. In the vicinity of the Boso Triple Junction, trench−parallel west−dipping thrusts form extensive fault scarps in the aseismic gaps during historical period. One of the scarps is longer than 200km associated with evidence of repeated activity, and is probably a candidate of M 8 earthquake in not far future.
    • 3D bathymetric image of the eastern margin of the Sea of Japan based on 3−second grid DEM

      Izumi, Noriaki; Nishizawa, Azusa; Horiuchi, Daishi; Kido, Yukari; Nakata, Takashi; Goto, Hideaki; Watanabe, Mitsuhisa; Suzuki, Yasuhito (2014)
      We have made detailed anaglyph images based on 3 second (about 90m) DEM processed from the original data obtained by Japan Coast Guard and JAMSTEC, in order to analyze submarine topography for a more precise interpretation of submarine active faults than that mapped by previous workers the eastern margin of the Sea of Japan. Most of the depicted active tectonic features are closely related to the location of symmetric anticlines formed by inversion tectonics along the former normal faults originally created during the period of formation of the Sea of Japan about 30-15 million years ago (Okamura, 2010). Interpretation of detailed anaglyph image by tectonic geomorphology method enabled us not only to depict major submarine active faults that coincide well with those revealed by the analysis of seismic reflection records, but also minor fresh tectonic landform with low−relief.
    • 3D bathymetric image of the Izu‒Ogasawara Trench and its vicinity based on 150 m grid DEM

      Izumi, Noriaki; Nishizawa, Azusa; Oikawa, Mitsuhiro; Kido, Yukari; Goto, Hideaki; Watanabe, Mitsuhisa; Suzuki, Yasuhiro; Nakata, Takashi (2015)
      We have made detailed anaglyph images of the Izu‒Ogasawara Trench and its vicinity based on 150 m DEM(Digital Elevation Model) processed from the original data obtained by Japan Coast Guard and JAMSTEC, in order to provide more detailed 3D submarine images for a more precise interpretation of tectonic landforms than previous studies. We give examples of images of the plate boundary around Mogi Seamount, extensive submarine eruption around Sumisu Caldera, normal faulting around Shichiyo Volcano Chain, volcanic domes between Sofugan Tectonic Line and Sofu Trough, central part of the Ogasawara Ridge and normal faulting around the Ogasawara Plateau.
    • 3D bathymetric image of the Nansei-Shoto Trench and its vicinity

      Izumi, Noriaki; Nishizawa, Azusa; Horiuchi, Daishi; Kido, Yukari; Goto, Hideaki; Nakata, Takashi
      We interpreted seafloor topography using anaglyph images based on 150 mDEM processed from multi−beam bathymetric data collected by Japan Coast Guard and JAMSTEC in the area around Nansei−Shoto Trench, and made more precise submarine active faults map than that mapped by previous workers. In the southern part of the trench, trench−parallel northwest−dipping thrusts form extensive fault scarps on the lower part of landward trench, indicating that repeated large earthquakes and tsunamis have been generated along the trench. Some of the scarps extend over several hundred km and the longest one is about 700 km. They are candidates for gigantic earthquake and tsunami generators. In the northern part, such scarps were scarcely recognized close to the trench axis due to collision of several bathymetric highs, while active reverse faults form distinctive fault scarps on the upper slope of the landward trench. They locate close to the island shelf, and are probably responsible to the uplift of islands forming Pleistocene and Holocene coastal terraces.
    • 3D bathymetric image of the northern margin of the Philippine Sea plate based on 3 second grid DEM

      Izumi, Noriaki; Kato, Yukihiro; Nishizawa, Azusa; Ito, Koji; Watanabe, Naoko; Nakata, Takashi; Goto, Hideaki; Ueki, Toshiaki; Kaji, Taku (2011)
      The northern margin of the Philippine Sea plate is marked by the Nankai Trough. The trough is known as one of the most active seismogenic zone in the world. However, the basic observations for prediction of giagntic earthquakes such as the detailed distribution of active faults have been lacking mainly due to insufficiency of data of the detailed submarine topography. To make a more precise submarine active fault map along the trough, we have made detailed submarine topographic images based on 3 second (approximately 90 m) DEM processed from the original data obtained by Japan Coast Guard since 1984 using multi−narrow beam echo sounder. Then we have made stereo−pair copies of topographic images for interpretation of active faults, in a similar manner we use in aerial photograph stereo sets for onland active faults. We have also prepared anaglyph images from the stereo−pairs for discussion.
    • 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity.

      Izumi, Noriaki; Nishizawa, Azusa; Horiuchi, Daishi; Kido, Yukari; Goto, Hideaki; Nakata, Takashi (2017)
      We interpreted submarine landforms using anaglyph images based on 150 m DEM (Digital Elevation Model) processed from multibeam data collected by Japan Coast Guard and JAMSTEC in the area around the southwestern part of the Kuril Trench, from off Shikotan Island to Erimo Seamount, and made more precise submarine active fault maps than those produced by previous researchers. Reverse faults are mainly distributed along the northern margin of the Kuril Trench and along the foot of continental slope, while normal faults are found along the boundary of the submarine basin and the outer ridge off Kushiro. These faults are considered deeply related to large earthquakes on the plate boundary between subducting Pacific plate and Hokkaido continental mass.
    • 3D Geomagnetic Structure of Miyake-jima Volcano before the Eruption in 2000 : an Application of 3D-GeomagneticTomography Method

      Ueda, Yoshio; Nakagawa, Hisaho; Onodera, Ken-ei; Suzuki, Akira; Kumagawa, Koichi; Kubota, Ryuji (2001)
      Three dimensional magnetic structure of Miyake-jima volcano before the eruption in June 2000, was derived from the airborne magnetic survey data by applying a 2D-FFT inversion method and a 3D-geomagnetic tomography method. This study revealed : (1) Bulk magnetization of Miyake-ji ma volcano is around 10.3 Alm, (2) Terrain connected magnetic anomalies show a positive residual amounting to 200nT to the south of the summit cone of Oyama, and relative low residuals of about -200nT in the western and eastern flank of the volcano, (3) 3D geomagnetic structure of Miyakejima volcano derived from geomagnetic tomography method shows a dome-like structure of high magnetization intensity instead of an comcal stratovolcamc structure: the magnetic somce with magnetization intensity higher than 5A/m is confined within the central part. On the other hand, the surrounding flank mainly composed of pyroclastic materials shows relatively lower magnetization. (4)The 3D-geomagnetic structure shows a strongly magnetized source ainounting to 16A/m trending N-S direction beneath the summit of Oyama‘(5) The result also shows a weekly magnetized zone whose magnetization intensity 1s less than 7A lm below the sea level The weekly magnetized zone in the western flank may correspond to the demagnetized zone due to enhanced thermal activity presaging the fissure eruption in June, 2000. The derived results also show availability of 3D-geomagnetic tomography method to detect the 3D magnetic strncture of the volcano.