*********** +++++++++++++++++++++ 121594B.BIO + Source: ONR Asia + *********** +++++++++++++++++++++ Contributory Categories: ENG, ENV Country: Japan From: Techno-Ocean '94 Proceedings Volumes International Symposium 26-29 October 1994 Kobe, Japan KWYWORDS: With each item +++++ Part II/II 6 Items Item 1 V. II. p. 723-727 Text in English AN IDEA TO DEVELOP TRACKING SYSTEM FOR MIGRATION RESEARCH OF BLUE WHALES Kiyohiko WAKUI RESEARCH INSTITUTE FOR OCEAN ECONOVICS KEYWORD: BIO-TELEMETRY, OBSERVATION OF OCEAN RESOURCES ABSTRACT Protection and controll of Blue Whale has failed due to lack of scientific ecological information. The conventional tracking system with satellite cannot collect such scientific data, because it doesn't have enough electrical power supply unit, which may enable grasping wider range of ecological information of blue whale during long period. o In order to solve this problem and to put respective data into practical use for the study of resources and migratory pathways, RIOE(Research Institute for Ocean Economics) are going to research and develop "WHALE MIGRATION TRACKING SYSTEM'. o As the other advantage of the new system unseen in the current bio-telemetory techniques, we can point out unique attachment devices made of materials which are 'gentle' to whales' bodies. o RIOE plays a role of coordinating development activities with the support of advices of lots of experts, as well as the cooperation of various enterprises which may offer their own - state of art'. o WHALE MIGRATION TRACKING SYSTEM" is getting best benefits of Japan's high-technology to cover the mode of life of blue whale which has ever been unkown to us. +++++ Item 2 V. II, p. 753-758 Text in Japanese PROPOSAL OF A WIDE AREA FISHING PORTS/VILLAGES CONSTRUCTION METHOD IN A TIDELAND REGION WITH A SHARP DISPARITY IN HIGH AND LOW TIDE LEVELS The Case of Ariake-kai Coastal Area Saga Prefecture Masatugu FUKUYA Nobuo TAKAKI Tadashi WAKINAGA Hiroshi TOMITA The Japanese Institute of Technology on Fishing Ports and Communities AJIMIC BUILD.2F 6-13-16 Akasaka, Minato-ku, Tokyo, Japan ABSTRACT In the coastal area of Ariake-kai in Saga Prefecture. there is a difference of about six meters between the highest and lowest levels reached by a tide. At ebb tide, the thick, weak strata create a tideland that extends as far as several kilometers. It is a sea ares condition that is unique even in Japan. The kind of condition has imposed numerous restrictions on the management of the fishing industry and construction of fishing port facilities, unseen in regions in the same Saga Prefecture that face the Sea of Japan . and it is these sase limitations that are proving to be a bottleneck in promoting the marine product industry in the region. Therefore, a survey of Ariake-kal coastal area in Saga Prefecture will be conducted. It is the region that is seen to benefit from having the same environmental conditions as other regions, Intergrating fishing industry production and everyday life and realizing a wide-area, consolidated construction. The objective of this survey is to clarify the shortcomings of the regional characteristics and fishing port/villege and also to examine the construction method of the fishing port / village, so as to design a construction Plan for a model fishing Port. Examples of the plan are being Introduced here. +++++ Item 3 V. II, p. 865-869 Text in Japanese ROLE OF OCYPODID CRAB IN THE TIDAL MUD FLAT B.K. Lim, Y. Koshikawa, K. Hagiwara and N. Sakurai Hayama Marine Science Laboratory, Kajima Technical Research Institute 2415 Isshiki Hayama-cho, Miura-gun, Kanagawa-ken, 240-01, Japan KEYWORDS: ocypodid crab, mud flat, hydrogen sulfide. ABSTRACT The role of ocypodid crab "Ilyoplax pusillus" in the tidal mud flat was characterized using an small scale of mud flat system. The experiment was carried out during 2 trials with existence and no existence of the crab in the mud flat. Air temperature and internal layer temperature of the mud flat, hydrogen sulfide (H2S) in the bottom layer, and chlorophyll (a) as well as phaeo-pigments on the mud flat surface were determined. The chlorophyll (a) was high during early period of the experiment, since microalgae propagated on the whole mud flat surface. Thereafter, in the trial with existence of the crab, high concentration of phaeo-pigments was detected, as the crabs crumpled the surfacial mud into a puddles and put away after feeding was observed frequently. In trial with existence of the crab, they always constructed their burrows by moving out the mud in the internal layer to surface. This activity is so-called a bioturbation, hence difference between air temperature and the internal layer temperature was smaller, and almost no H,S was detected. Meanwhile, the difference temperature was larger and concentration of H,S was high in trial with no existence of the crab. The crab's activities presumably contribute to enviroranental management of the tidal mud flat. +++++ Item 4 V. II, p. 871-876 Text in Japanese HELP TO SAVE THE MUDSKIPPER Nobuo SAKURAI Hayama Marine Science Laboratory, Kajima Technical Research Institute 2415 Isshiki Hayama-cho, Miura-gun, Kanagawa-ken, 240-01, Japan KEYWORDS: Repairing Revetment, Mudskipper, Tideland ABSTRACT Mudskippers continue to live in a few parts of Tokyo Bay estuarine area will extinct, because of repair works of the revetment. The ministry of construction was aware of this fact, and tried to construct an inhabitable tidal mud flat for the mudskippers as repairing the revetment. This was the first trial in Japan. The current paper reports the construction progress, and also introduces the volunteers who participated and cooperated in this activity. +++++ Item 5 V. II, p. 883-886 Text in Japanese ENVIRONMENTAL PURIFICATION FUNCTION IN COASTAL ECOSYSTEM Makoto NAKAKURA' Shinya OTAKE* Chokei ITOSU** *Fukui Prefectural University Gakuen-cho Obama,917,JAPAN ** Tokyo University of Fishery Konan Minato-ku Tokyo, 108,JAPAN KEYWORDS: deposit feeders, purification, ecosystem ABSTACT The deposit feeders and filter feeders play an important role in purification of polluted water. Bivalve contributes to reduction of SS concentration through intake suspended particulate mat ter by filtration surrounding water, the filtration rate of a clam of 3 cm shell length being about 1 liter/hour. Kuruma prawn feeds muddy sediment of about 18 times of self weight, sand worm feeding abou t4 times. Hard decomposition organic matter such as cellulose is decomposed by bacteria. Bacteria are also good food for deposit feeder. The function of those biofiltrations and the detritus food chain is enhanced under the waters with enough DO concentration. The COD redution rate in the muddy sediment of tide land or shallow water is about 0.7 to 1.4 tons/km^2/day under the condition of the DO concentration more than 2.5 liters/M^3. The purification potential of tidal land area of 1 km^2,, therefore, is equivalent to one plant potential of waste water treatment. We discuss about the self purification function of coastal water's ecosystem and the conditions to bring into full play functions. +++++ Item 6 V. II, p. 887-892 Text in Japanese LANDING OF SEA TURTLES ON THE TOBAN-COAST Shin TUBOKA Kouji TOMITA Himeii Work Office, Kinki Regional Construction Bureau, Ministry of Construction KEYWORDS: Beach nourishment, Loggerhead seaturtle ABSTRACT Toban-coast is typical one, which shoreline is withdrawing every year by erosion of waves from old times. To take measures against this, the Ministry of Construction directly excuted a project primarily of the work of revetment from 1961. Suffering, however, from the disaster of typhoons in 1964,1965, with this as a turning point, after 1968, they carried out the complete equipment of the constructions of wave dissipation works, offshore breakwater and others. But in spite of the installation of offshore breakwater, and others, the sands didn't show a improvement. Moreover, big city locats behind this coast, and which is near the town, so the recreations of on the beach is very popular. In thes6 circumstances, wave dissipation works by sands (beach nourishment), in stead of concrete armor unit, are put into practice for the first time in Japan, and in addition to this work, the work of revetment, offshore breakwater, groin are und8r constructions. As the sands vanished by erosion, Loggerhead sea turtle disapeared, but six times at least they were identified which went ashore and spawned, from 1989 to 1993, along this coast (at Hayashizaki), where are all the place of construction of beach nourishment work, they can guess that the structure of beach nourishment meet the requirements of Loggerhead sea turtle spawning. +++++ END Part II/II ************** END Msg. B.BIO **************