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全文: "名護湾"
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  • 金城 清昭, 海老沢 明彦
    水産増殖
    1993年 41 巻 1 号 105-112
    発行日: 1993/03/20
    公開日: 2010/12/10
    ジャーナル フリー
    沖縄島産シマアジの漁獲実態を調べたところ, 以下の生態的知見が得られた。
    1.尾叉長5cm台以上のシマアジ幼魚が, 例年4月頃から沖縄島の東西両岸の内湾度の高い沿岸海域に出現した。
    2.漁獲サイズや漁場の季節的な変化から判断して, シマアジの生活域は, 成長にともない内湾度の高い沿岸浅海域から徐々に沖に移っていくと考えられた。また, 大型魚は夏はより沖合に, 冬はより沿岸に分布し, 季節的な移動を行うと推測された。
    3.生殖腺指数, 聞き取りの結果および幼魚の出現時期とその大きさなどを考慮すると, 沖縄島周辺でのシマアジの産卵期は11月以降から冬季にかけてと推測された。
    4.尾叉長組成の解析結果から, 次式のBertalanffyの成長式が得られた。
    Lt=66.5× {1-e (-0.374 (t+0.117) ) }
    Lt: t才時の尾叉長 (cm) t: 年齢 (才)
  • 吉村 健司
    日本地理学会発表要旨集
    2015年 2015s 巻 814
    発行日: 2015年
    公開日: 2015/04/13
    会議録・要旨集 フリー
    沖縄県本部町は、県内でも有数のカツオの水揚げの地として名を馳せてきた。しかし、近年は衰退傾向にある。燃料価格の高騰や後継者不足の問題などの社会問題に加え、南西諸島域のカツオ漁の独特の問題として餌料確保の点が挙げられる。カツオ漁では、キビナゴなどのイワシ系の小魚を撒きながら漁を行う。そのため、餌料の入手は、カツオ漁の操業の可否決定要因の一つである。  本報告で対象とする沖縄県本部町のカツオ漁では、2010年にカツオ一本釣漁船団の「第十一徳用丸」(徳用丸)が解散した。徳用丸は餌料採捕班とカツオ釣獲班による船団内分業を採用する、沖縄に古くから存在した形式を保持した船団であった。ところが、徳用丸も餌料採捕の問題を含む冒頭に挙げた諸点を理由に解散した。現在では5名体制から「第二黒潮丸」が操業しているものの、規模は徳用丸と比べ、小さく漁獲量も少ない。餌料は自ら採捕しているものの、安定的に採捕できていないのが現状である。本部町のカツオ漁において餌料採捕の状況がカツオ漁の盛衰とは無関係ではない。そこで、本報告では本部町のカツオ漁の衰退要因として挙げられる餌料採捕の状況について、その変化について報告を行う。  現在、本部町におけるカツオ漁は、水産業に占める生産額、水揚量のうち約3割を占める主力漁業となっている。カツオ漁に用いる餌料採捕では、古くから「四艘張網」と呼ばれる集魚灯と敷網を用いた漁法が用いられてきた。集魚灯により魚を集魚し、4艘の船を四方に配置し、網を張り、そこに魚を誘導する漁法である。この漁法は1970年以降、沖縄県では本部町のみで行われてきた漁法である。現在も集魚灯によって魚を網に誘導する漁法であるが、かつてのような四艘張網ではなくなっている。この漁法は集魚灯の明かりによって魚をおびき寄せるため、沖縄で多く流出する赤土は、集魚効果を減少させるため操業の疎外要因となる。また、同様の理由で月夜には操業ができない 1970年台には本部町のカツオ漁における餌料採捕漁場は、運天港(今帰仁村)、瀬底島(本部町)、名護湾(名護市)というように、本部半島一帯を利用してきた。特に運天港は最大の漁場で、本部町のカツオ漁の歴史において欠かすことのできない漁場といえる。その後、本部町周辺では、埋め立てや橋梁建設などが相次ぎ、本部町沿岸域、特に瀬底島周辺の利用が減少し、利用の中心は運天港に集中することとなった。名護湾は、旧暦の9月過ぎに吹き始める季節風であるミーニシ(新北風)が吹き始める頃に利用する、補完的な漁場であった。これは本部半島の山々が風を遮るため、操業が行いやすいためである。逆に、運天港では風の影響を受けるため操業が困難となる。現在は、母港である渡久地港の地先のみを利用しているのが現状である。渡久地港地先では運天港と違い、カツオ漁の出漁に耐えうるほどの餌料を採捕できないことも多々あり、餌料採捕漁場としては、決して十分とはいえない。  本部町のカツオ漁の餌料採捕漁場は、カツオ漁の衰退とともに、利用してきた漁場が縮小していった。カツオ漁の出漁可否の決定要因は餌料にあることから、大規模漁場の運天港の利用こそが、カツオ漁の安定操業に重大な貢献を果たしてきたことがわかる。 
  • 広瀬 雅人
    タクサ:日本動物分類学会誌
    2017年 42 巻 4-9
    発行日: 2017/02/28
    公開日: 2017/02/28
    ジャーナル オープンアクセス

    Bryozoans are sessile, clonal animals; about 6,000 living species have been described. The recent study revealed approximately 1,000 species including undescribed species in Japanese waters. Diversity of bryozoans in Okinawa has been not studied in detail; only 22 species have been reported previously. The recent review of bryozoan diversity in the Nansei Islands including Okinawa estimates more than 150 species in this area; the fauna is characterized with both temperate and the Indo-Pacific species. Marine benthic environment in Okinawa varies in the characters, such as dead coral and rubble assemblage in shallow depth, sandy or muddy bottom in deeper area, and mangrove forest at estuarine area. Depends on the diverse benthic environment, bryozoans form colonies of various morphologies on different kinds of substrates such as dead coral and shells. Some bryozoans inhabit muddy bottom by forming erect or free-living colonies. Recent study on bryozoan life-history find the correlation between sand-dwelling bryozoan life-history and climatic characters such as high temperature during summer and disturbance of the water column caused by typhoon. Furthermore, specific relationships between endemic bryozoan species and other organisms in Okinawa also contribute to maintain the high diversity of benthic organisms in Okinawa. Bryozoans are suitable for further study on biogeography and speciation of marine benthic organisms, since some bryozoan species have lower dispersal ability and their distribution is limited in the small area. Taxonomic studies of highly diverse marine organisms in Okinawa have a potential to provide crucial information for development of ecological studies and protection of the organisms and their habitat in Okinawa.

  • 青木 三郎, 生沼 郁
    地質学雑誌
    1974年 80 巻 2 号 57-63
    発行日: 1974/02/15
    公開日: 2008/04/11
    ジャーナル フリー
  • 黒田 長久
    山階鳥類研究所研究報告
    1971年 6 巻 3 号 260-285_1
    発行日: 1971/06/30
    公開日: 2008/11/10
    ジャーナル フリー
    During Oct. 6-23, 1970, bird survey was made by line transect-, car- and boat censuses in the Ryu Kyu Is. The party was sent by the Ministry of Wellfare of Japan and included botanical and coral reef surveys particularly of Iriomote I. Bird census was made 11 days on Iriomote I., 4 days on Ishigaki I. and 2 days on Okinawa I. and results are presented by 14 tables classified by habitat and categories such as resident land or winter water birds, etc. In all 81 species were recorded.
    Among resident land birds, the bulbul Hypsipetes amaurotis was most abundant (No. recorded 258 birds), followed by the white-eye Zosterops palpebrosa (105 bds), the turtle dove Streptopelia orientalis (98 bds), the great tit Parus major (87 bds), the jungle crow Corvus macrorhynchos (85 bds), the tree sparrow Passer montanus (44 bds., very scarce on Iriomote), the varied tit Parus varius (38 bds), the minivet Pericrocotus roseus (36 bds), the fantail warbler Cisticola juncidis (27 bds), the green pigeon Sphenurus sieboldi, the rock thrush Monticola solitaria (13 bds) and the wood pigeon Columba janthina (9 bds), ect. (25 species in all). Thus the bulbul occupied 30% (the next white-eye 12%) of resident land birds counted.
    The migration of northern land birds was still in early stage, only 9 species having been recorded, among which the swallow Hirundo rustica was most abundant (741 bds). Other marked species was the buzzard hawk Butastur indicus (199 bds) which was observed in scattered soaring flocks steadily migrating southward over Iriomote and Ishigaki Is. and a few tired birds were seen landed on the islands. The next was the red-cheeked myna Sturnus philippensis (145 bds) which is also a regular passage migrant along the Ryukyus and rare Chinese myna St. sinensis (16 bds) was found mixed in its flock. Muscicapa griseisticta (20 bds) and single dirds of Urosphena squameiceps, Eophona migratoria and Cuculus saturatus, etc. were recorded.
    Some early land winter visitors were just on their arrival, 7 species in all, of which the grey wagtail Motacilla cinerea (90 bds) outnumbered others, which were pipits Anthus (10 bds), the white wagtail M. alba (8 bds), the Philippine red-tailed shrike Lanius cristatus lucionensis (7 bds), single birds of yellow wagtail M. flava subsp., Siberian bluetail Erithacus cyanurus and the ksestrel Falco tinnunculus.
    Resident water, water-side and wading birds were following ten species: Charadrius alexandrinus (81 bds), Egretta sacra (62 bds., with 64.5% white phase), Gallinula chloropus (48 bds., mainly Ishigaki), Anas poecilorhyncha (39 bds), Ardea purpurea (12 bds., Iriomote), Alcedo atthis (7 bds), Ixobrychus cinnamomeus (6 bds), Pandion haliaetus (4 bds), Porzana fusca (2 bds) and Gorsakius goisagi (1 dbs., Okinawa).
    Winter and migrant waders were 20 species (4 species as winter visitor), with 5 species of herons. Pluvialis dominicus (131 bds), Tringa incana (71 bds), Numenius phaeopus (64 bds), Tringa hypoleuca (59 bds), Tringa glareola (43 bds), Tringa nebularia (30 bds), Tringa ocrophus (17 bds) were chief species and one Calidris bairdii was observed as a rare straggler. Five herons were Egretta alba, E. intermedia, Bubulcus ibis, Butorides striatus and Ardea cinerea.
    Sea birds were very scarce. A few Sterna bergii (19 in all) and one Calonectris leucomelas were seen between Ishigaki and Iriomote. A frigatebird is said to have occurted over Ishigaki and the presence of breeding colonies (said to breed in May) of Sterna sumatrana along west coast of Iriomote was reported to the author.
  • 石賀 裕明, 山崎 静子, 河野 重範, 道前 香緒里
    日本地質学会学術大会講演要旨
    2000年 2000 巻 O-353
    発行日: 2000/09/25
    公開日: 2017/08/24
    会議録・要旨集 フリー
  • 黒田 登美雄, 古川 博恭, 迫田 美佐子
    日本地質学会学術大会講演要旨
    2000年 2000 巻 O-352
    発行日: 2000/09/25
    公開日: 2017/08/24
    会議録・要旨集 フリー
  • 黒岩 恒
    地質学雑誌
    1894年 1 巻 4 号 172-176
    発行日: 1894年
    公開日: 2008/04/11
    ジャーナル フリー
  • 和田 英敏, 福地 伊芙映, 宮本 圭, 立原 一憲, 本村 浩之
    タクサ:日本動物分類学会誌
    2020年 49 巻 67-73
    発行日: 2020/08/31
    公開日: 2020/09/03
    ジャーナル オープンアクセス

    Two specimens (67.5–75.1 mm standard length; SL) of Plectranthias maekawa Wada, Senou and Motomura 2018 (Serranidae: Anthiadinae), previously recorded only the Tokara Islands, Kagoshima Prefecture, Japan, were collected from Okinawa-jima and Yonaguni-jima islands, Okinawa Prefecture, Japan. The present specimens, described herein in detail, represent the first records of the species from Okinawa Prefecture. Although the body depth (% of SL) has been regarded as one of diagnostic characters between P. maekawa and two closely-related congeners (Plectranthias helenae Randall, 1980 and Plectranthias wheeleri Randall, 1980) in the original description of P. maekawa, that of the present new specimens was overlapped with the latter two species (viz., 33.5–37.7% of SL in P. maekawa, 35.5–38.7% SL in P. helenae, and 35.6–37.9% of SL in P. wheeleri). The number of serration on the margins of subopercle and interopercle in P. wheeleri and P. maekawa has also been regarded as a diagnostic character for the two species, but additional specimens described in this study showed that the number of serration changed ontogenetically, and it overlapped in the similar-sized specimens of the two species. However, the validities of other diagnostic characters given in the original description of P. maekawa are reconfirmed in this study (viz., number of pectoral-fin rays, scales on above and below lateral line, morphometrics of body width, head length, third dorsal-fin spine length, caudal-peduncle length and depth, and both coloration of fresh and preserved conditions). In addition, three specimens of P. wheeleri (71.3–83.7 mm SL) from the Okinawa Islands, are reported here as the first records of the species from Okinawa Prefecture; it has been previously recorded from Japan (Sagami Bay, and Tokara and Amami islands), Taiwan, Indonesia, and Australasia.

  • 上原 匡人, 今井 秀行, 岩本 健輔, 太田 格, 海老沢 明彦, 吉野 哲夫, 立原 一憲
    魚類学雑誌
    2015年 62 巻 1 号 13-28
    発行日: 2015/04/25
    公開日: 2017/08/10
    ジャーナル フリー

    Accurate descriptions of distribution and habitat are important for effective We examined the distribution patterns and habitat preferences of two related gizzard shads, Nematalosa japonica and N. come, based on specimens, reports and fish market research in the Ryukyu Archipelago. Both species are N. japonica to the north of Okinawa-jima Island, and come in waters off Amami-ohshima Island and the Okinawa Islands, thereby being distributed at Amami-oshima Island and Okinawa-jima Island. Natural between the two species, found only at Okinawa-jima Island indicated that is a natural hybrid zone. Analysis using a random forest method and fish market N. japonica was most affected by tidal flat type tidal flats), the species being dominant in restricted fishing grounds (Nakagusuku and Haneji coastal waters) that include many coastal tidal flats. However, N. come fected by bottom sediment type, the species being dominant in a of fishing grounds (Kin and Nago Bays, and Nanbu-higashi, Nago-higashi, Nakijin Shioya coastal waters). Thus, the distribution pattern of the two species at OkinawaIsland was affected by environmental factors, such as tidal flat type, and area and sediments. Our findings indicated a clear discontinuity in home range between the fort (CPUE) of the two species has highly altered environments. These findings indicated that the diminution of suitable Okinawan populations of both species. Accordingly, the two Nematalosa species are as being of good indicators of the health and conservation of shallow areas, such as tidal flats. Shallow habitats should be conserved to preserve healthy populations of the two species.

  • 氏家 宏
    第四紀研究
    1980年 18 巻 4 号 209-219
    発行日: 1980/02/29
    公開日: 2009/08/21
    ジャーナル フリー
    Most recently (UJIIÉ, OKI and HIGASHIKAWA, 1979), a remarkable island shelf ca. 50 to 70km wide and ca. 360km long has been recognized at the apprroximately 500m water depth on the southern Ryukyu Island Arc by an examination of 1/200, 000 bathymetric charts prepared by the Hydrographic Office of the Maritime Safety Agency for publication (Figure 1). Meanwhile the southern two thirds of the shelf was figured out in details by a number of seismic profiling surveys around the area carried out by the Hydrographic Office (HAMAMOTO, SAKURAI and NAGANO, 1979). In this paper I suspect the shelf as to be covered with a submerged reefal limestone according to the reasons mentioned below. 1) A petroleum exploration well located on the shelf (“WELL” in Figure 1) revealed the presence of 64m thick reefal limestone at the top. 2) Smith-McIntyre-type snapper and Phleger-type gravity corer failed to acquire enough amount of sediment samples from the shelf in the October 1978 cruise aboard on the R/V Kagoshimamaru. Besides, great damage upon the core edges at every time of operation suggests that the samplers always hit on the hard rock. 3) Grain-size composition of the sediments from the shelf rather resembles to that of some sand patches observed on the littoral reef off Okinawa-jima (Figure 3). 4) Benthonic foraminiferal assemblages from the same samples show generic compositions characteristic to the inner neritic environment, differently from those expected from such a depth as 500m. The discrepancy may be ascribed to the present environment similar to coral reef, although Recent littoral reef is characterized by common occurrence of Soritidae, Amphisteginidae, Calcarinidae, and so on, which are seldom on the island shelf. 5) Geomorphology of the island shelf provided with fairly flat surface and sharp marginal edge suggests that the surface is inevitably capped with such hard rocks as reefal limestone resistant against the erosion by water turbulence, particularly by the Kuroshio Current flowed over. 6) Depending upon the same reason, the “Southern Boundary Fault of the Central Ryukyu Island Arc” could well keep its sharp scarpment in the shelf area, whereas it is unable to trace the scarpment on the shelf slope which is composed of the semiconsolidated muddy facies of the Shimajiri Group (Figure 4).
    If the limestone-capped island shelf around 500m water depth is accepted as a new hypothesis, some significant events will be supposed for the Quaternary geological history of the Ryukyu Island Arc system. Several blocks shallower than 200m, including all island masses and banks, abruptly stand up on the island shelf bounded by many faults running in perpendicular to the Arc trend (Figure 2). Almost all the blocks are also covered with 60 to 70m thick reefal limstone, called the Ryukyu Group, in a narrow sense. Therefore, it is able to regard that these blocks represent relatively upheaved parts of the island shelf. The hereby deduced block-movement corresponds to the “Uruma Crustal Movement” of KIZAKI and TAKAYASU (1976) who proposed this by geological survey on land. By the movement, moreover, the “South Boundary Fault of the Central Ryukyu Island Arc” named in this paper may have been formed in accompanying about 1500m or more down-throw of the northern side, in another word, of the southern end of the Central Ryukyu Island Arc. The Fault must replace the Miyako Depression, which has currently been utilized since KONISHI (1965) for the discussion in structural geology and biogeography; the Depression has ever implied no precise definition in geography.
    Beneath the reefal limstone spread over the whole of the island shelf region, gently folded or inclined strata of the Shimajiri Group are distributed throughout.
  • 山田 和芳, 福澤 仁之, 奥野 充
    日本地質学会学術大会講演要旨
    2003年 2003 巻
    発行日: 2003/09/10
    公開日: 2017/08/22
    会議録・要旨集 フリー
  • 黒田 登美雄, 古川 博恭, 小澤 智生, 神谷 厚昭
    日本地質学会学術大会講演要旨
    2003年 2003 巻
    発行日: 2003/09/10
    公開日: 2017/08/22
    会議録・要旨集 フリー
  • 窪寺 恒己, 奥谷 喬司
    Venus (Journal of the Malacological Society of Japan)
    2002年 61 巻 3-4 号 159-168
    発行日: 2002/12/31
    公開日: 2018/09/01
    ジャーナル オープンアクセス
    Euprymna megaspadicea n. sp. collected from Nago Bight, Okinawa Island, Japan, is described. This species is characterized by its small size compared with its congeners, and by having four rows of suckers on all arms, arm II longer than the other arms and a hectocotylized left arm I in males. Modification of the hectocotylus affects almost the whole length of the arm, and is characterized by the fusion of all sucker pedicels giving the arm a peculiar massive, wavy and twisted appearance.
  • 大路 樹生, 速水 格
    化石
    1992年 53 巻 51-53
    発行日: 1992/11/30
    公開日: 2017/10/03
    ジャーナル フリー
  • 沖縄県名護ヒートゥ漁を中心として
    遠藤 愛子, 山尾 政博
    地域漁業研究
    2007年 47 巻 2-3 号 75-98
    発行日: 2007/10/01
    公開日: 2020/12/04
    ジャーナル オープンアクセス

    本研究は,沖縄県名護における鯨類資源と地域との係わりについて分析し,変容する鯨類資源の利用実態とその役割を浮き彫りにすることを目的としている。第一に,名護の突きん棒漁業の生産と流通構造を明らかにした。商業捕鯨モラトリアム以降,捕獲された鯨類のうちゴンドウクジラ類は地元ではなく福岡市場に販売されている。全国的に,生鮮鯨肉のうちゴンドウクジラ類を取り扱うのは福岡市場に限られており,沖縄産,鮎川産,太地産が福岡市場に集中し,生鮮鯨肉間,さらに生鮮鯨肉と冷凍鯨肉の間に品質・価格競争を引き起こしている。福岡市場での地域ブランド形成が今後の課題となる。第二に,地元名護に供給される鯨肉生産物の消費実態をあきらかにするため,地域住民を対象に鯨肉食に対するアンケート調査を実施した。慢性的な供給不足と高値設定のために,消費者のヒートゥ肉ばなれが進行していた。しかし,ヒートゥ肉の食習慣が維持・継承されており,供給量の増加と価格低下を要望する消費者の声が目立った。第三に,地域社会においてヒートゥ漁や鯨類資源がもつ多面的機能について検討した。漁業生産活動による食料供給以外に,社会文化的な役割を果たしている。ヒートゥ漁存続のためには,地元消費や地域社会と結びついた存在意義の見直しが必要である。なお,本研究を進めるにあたり,仙台,築地,横浜,名古屋,大阪,広島,福岡,大分の8中央卸売市場における鯨肉取扱について調査しその取扱状況を類型的に把握した。

  • 戦災復興計画研究 その2
    石丸 紀興
    都市計画論文集
    1987年 22 巻 127-132
    発行日: 1987/10/25
    公開日: 2020/08/01
    ジャーナル オープンアクセス

    This study examines the war-damage and the reconstruction planning in Nago City, Okinawa Prefecture. For example, how was the war-damage in Nago different from ones in the Japanese mainland? Then, what had the reconstruction planning been made in utter confusion? Especially, how was the land readjustment without rule of system and financial help? After that, I try to estimate and consider the land readjustment in Nago.

  • 真喜屋 力
    デジタルアーカイブ学会誌
    2019年 3 巻 1 号 31-34
    発行日: 2019/01/07
    公開日: 2019/02/18
    ジャーナル オープンアクセス

    沖縄アーカイブ研究所では、沖縄県内の市井の人々の所有する8mmフィルムを収集、保存、公開する事業を行っている。2年間で83時間分の映像を収集し、CC-BYによって公開している。さらに、インターネットでの配信を始め、上映会、テレビ番組、アートなどとのコラボを積極的に展開し、認知度を高めると同時に新たな収集活動などに取り組んでいる。これまでの2年間の活動を振り返り、8mmフィルムの持つ資料としての重要性を改めて確認できたこと、フィルムのアーカイブ化を上映会や放送につなげることでその映像のメタデータをより豊かなものにし、新たな映像の発掘・収集に繋がってきたことを報告する。

  • 金城 孝一, 有田 和宏, 灘岡 和夫, 仲宗根 一哉
    土木学会論文集B2(海岸工学)
    2011年 67 巻 2 号 I_1336-I_1340
    発行日: 2011年
    公開日: 2011/11/09
    ジャーナル フリー
    This study aims to clarify the topographical classification of fringing reefs and the water circulation structure ("reef-cell") in typical topographic types of coral reefs. Fringing reefs which are well seen in Okinawa can be classified into five types according to the topographical features and physical conditions. Numerical experiments showed that spatial non-uniformity of wave set-up is developed by wave refraction patterns according to reef topography, and resultantly a flow circulation pattern named "reef-cell" corresponding to the geographical features is generated. The unit cell structure in the reef, which is similar to terrestrial watershed, can be established by combining the topographical classification and the hydrodynamic reef-cell characteristics.
  • 久保 弘文
    タクサ:日本動物分類学会誌
    2017年 42 巻 16-21
    発行日: 2017/02/28
    公開日: 2017/02/28
    ジャーナル オープンアクセス

    Approximately half of the threatened Japanese tidal-flat molluscan species live in Nansei-shoto Islets, and 84% of them (71 species) distribute in Okinawa-jima Island. Twenty-four out of 71 species are endemic or limited to Okinawa-jima. Therefore, Okinawa-jima is one of the most important habitats in Nansei-shoto for those molluscs. A vast tidal flat with an area of 1,962 ha used to exist in Okinawa-jima in 1945. However, 75% of the area has been lost by 2012 due to reclamation. After endangered species in Okinawa-jima was evaluated quantitatively, all 24 species were considered the critically endangered species. As for the tidal-flat molluscs of southern part of Okinawa-jima Island, species diversity was already decreased by coastal development for economic activities. The first extinct species of Japanese tidal-flat molluscs was recognized in Okinawa-jima Island. Natural bay areas still remain in Oura bay and Haneji naikai inland sea, northern part of Okinawa-jima. We must protect these bay areas where the threatened tidal-flat molluscs are able to inhabit.

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