著者
桑原 久実 綿貫 啓 青田 徹 安藤 亘 川井 唯史 寺脇 利信 横山 純 藤田 大介
出版者
日本水産工学会
雑誌
日本水産工学会誌 (ISSN:09167617)
巻号頁・発行日
vol.43, no.1, pp.81-87, 2006-07-15 (Released:2017-09-01)
参考文献数
21
被引用文献数
3

To detect the trend on seaweed restoration techniques on barren grounds in Japan, domestic literature (> 1,000) published since 1970 were surveyed. The literature contains local survey (18%), experiments and detailed observations (23%), recovery trials (43%) and reviews (16%). The literature increased chronologically with a temporal maximum in 1980-85. Among the local areas, literature was particularly abundant in western coasts of Hokkaido and Pacific coasts of middle Honshu (from the Kii Channel to Cape Inubo). The target seaweed bed types were mostly kelp and Sargassum forests and the dominant causative agents of these bed reductions were intensive grazing by sea urchins and herbivorous fishes. The literature analysis revealed that 'removal' of sea urchins and 'defense' of seaweeds were unreasonably preceded by employing stones or concrete blocks and transplanting seaweeds. Grazing by herbivorous fishes is a recent problem in southern Japan; the literature abruptly increases after 2000. These may represent some of the reasons why barren ground recovery projects were unsuccessful.
著者
中泉 昌光 木村 智也 安藤 亘 林 浩志
出版者
日本水産工学会
雑誌
日本水産工学会誌 (ISSN:09167617)
巻号頁・発行日
vol.55, no.3, pp.235-251, 2019 (Released:2019-09-02)
参考文献数
4
被引用文献数
2

Amid increasing global demand for marine products and expanding exports, it is required to take measures to eradicate the Illegal, Unreported and Unregulated (IUU) Fishing. More consumers prefer and choose traceable and sustainable products due to growing interest in environment. In Japan, rapidly declining and aging population have a great impact on maintaining fishing communities such as a serious shortage of workers. Therefore, the authors have surveyed major fishing ports and their markets in Europe as well as collected existing reports and information on fishing ports overseas and conducted comparative analysis on the management and operations of the fish market which utilizing ICTs. After clarifying the characteristics of the management and operations overseas and at home, and the background of advanced auction system such as electronic auction and online in Europe, the authors have found that digitalization and expanding network - utilizing ICT such as PCs, tablets, smartphones and the internet - surely contribute to ensuring traceability against IUU Fishing. It is clear that Japan is left far behind in introducing electronic auction apart from the difference of landing, selling and shipping style. The authors have also proposed the digitalized and networked system for the management and operations of the fish market based on the database sales information combined with catch information, designed to realize hygiene highly-managed fishing port - fish market in Japan - which can supply quality, traceable and sustainable marine products to consumers globally. In addition, the proposed system can help market officials, producers and buyers save their labor and time.
著者
三上 信雄 安藤 亘 石岡 昇 大隈 篤 山本 秀一 北野 倫生
出版者
公益社団法人 土木学会
雑誌
海洋開発論文集 (ISSN:09127348)
巻号頁・発行日
no.23, pp.925-930, 2007

To promote utilization of Okinotorishima island and its surrounding areas mainly in the fishery field, fishery resources and environmental conditions were surveyed in and around the coral reef of the island. Corals were widely distributed in the lagoon. Some useful fishery species were caught through the wide range from the surface to the deep water around the reef. Their preys such as eggs, juveniles and young of some small sized fish species were also observed there. Therefore, it may be possible to utilize the island as a good fishing ground with an artificially increased primary production. To develop this potential, some ideas and their issues to be solved in the future were discussed in this study.
著者
安藤 亘 門脇 徹治 渡辺 篤史 崔 奈美 加部 義夫 恵良田 知樹 石井 紀彦
出版者
公益社団法人 日本化学会
雑誌
日本化学会誌
巻号頁・発行日
vol.1994, no.3, pp.214-223, 1994
被引用文献数
7

14族典型元素からなるセスキスルフィド(RM)<SUB>2n</SUB>Y<SUB>3n</SUB>(M=Si,Ge,Sn,Y=S)は,アダマンタン構造(IIa)(n=2)又は,まれにダブルデッカー構造(IIb)(n=2)をとることが知られている.これらセスキスルフィドから向かい合っている一対の硫黄を一つずつ減らすとノルアダマンタン(VIIIa),ビスノルアダマンタン(IXa),ノルダブルデッカー(VIIIb),ビスノルダブルデッカー(IXb)と呼ばれる新規なペンタ及びテトラスルフィドが生成する.トリクロロモノゲルマン([1a]と[lb]),トリクロルモノシラソ([8a]と[8b])トリクロロモノスタナン([10a]と[10b])の硫化水素/ピリジン,硫化リチウム,硫化ナトリウム,五硫化アンモニウム,ビストリメチルシリルスルフィドなどによる硫化反応では,トリクロロモノゲルマン([1a]と[1b])のみがゲルマニウム-ゲルマニウム結合を有するペンタスルフィド([5a]と[7b])を副生した.主生成物は,アダマンタン構造のセスキスルフィド([2a],[2b],[9a],[9b],[11a]と[11b])が,トリクロロモノゲルマン,トリクロロモノシラン,トリクロロモノスタナンにおいても生成してきた.一方,テトラクロロジシラン[12]とテトラクロロジゲルマン[15]の硫化リチウムとセレン化リチウムによる硫化ないしセレノ化では,ペンタスルフィドとペンタセレニド([13a],[13b]と[5a])が収率良く生成した.X線結晶構造解析は,ケイ素-ケイ素結合の切断されたノルアダマンタン構造を明らかにした.テトラクロロジゲルマンは,硫化水素/ピリジン,硫化リチウム,五硫化アンモニウム,テトラチオタングステン酸ピペリジニウムなどの種々の硫化剤と反応し,ゲルマニウム-ゲルマニウム結合の切断されていないテトラスルフィド[16]も副生した.その構造は,ビスノルアダマンタン構造であるとX線結晶構造解析により確定した.トリクロロモノゲルマン([1a]と[1b])からのペンタスルフィド([5a]と[7b])の生成は,硫化剤が還元剤として働くことにより,又,テトラクロロジゲルマン[15]からのペンタスルフィド[5a]とテトラスルフィド[16]の生成は硫化剤の求核性の強さに依存しているものと考えられる.