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  1. 水産研究・教育機構出版物
  2. 水産研究・教育機構研究報告
  3. 第49号

Effects of fish aquaculture on inorganic nutrient levels in Gokasho Bay

https://fra.repo.nii.ac.jp/records/2010960
https://fra.repo.nii.ac.jp/records/2010960
56df13e1-fc4a-4fdd-b188-6ee5e134a58f
名前 / ファイル ライセンス アクション
fra_k_49_121.pdf fra_k_49_121.pdf (1.1 MB)
license.icon
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2024-10-02
タイトル
タイトル Effects of fish aquaculture on inorganic nutrient levels in Gokasho Bay
言語 en
言語
言語 eng
キーワード
言語 en
主題Scheme Other
主題 dissolved nutrients; oligotrophication; primary production
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ departmental bulletin paper
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
著者 渡部, 諭史

× 渡部, 諭史

WEKO 705
e-Rad 40371877
ORCID 0000-0002-5630-632X

en Watanabe, Satoshi

ja 渡部, 諭史


ja-Kana ワタナベ, サトシ

Search repository
皆川, 昌幸

× 皆川, 昌幸

WEKO 633
e-Rad 80371839

en Minakawa, Masayuki

ja 皆川, 昌幸


ja-Kana ミナカワ, マサユキ

Search repository
石樋, 由香

× 石樋, 由香

WEKO 457
e-Rad 10372046

en Ishihi, Yuka

ja 石樋, 由香


ja-Kana イシヒ, ユカ

Search repository
長谷川, 夏樹

× 長谷川, 夏樹

WEKO 807
e-Rad 50470141
ORCID 0000-0002-5747-611X

en Hasegawa, Natsuki

ja 長谷川, 夏樹


ja-Kana ハセガワ, ナツキ

Search repository
松本, 才絵

× 松本, 才絵

WEKO 629
e-Rad 80344331

en Matsumoto, Toshie

ja 松本, 才絵


ja-Kana マツモト, トシエ

Search repository
抄録
内容記述タイプ Abstract
内容記述 Eutrophication derived from aquaculture effluent and consequent environmental deterioration are becoming increasingly problematic in many parts of the world. On the other hand, eutrophication has been reduced in coastal waters of Japan because of mitigation efforts over the past thirty years. While such efforts have positive effects on maintaining environmental integrity, excessive reduction of nutrient load to the coastal environment is thought to have reduced the productivity of many fishery resources and unfed aquaculture. Our hypothesis is that putting aquaculture effluent into practical use enhances the production of coastal fisheries and unfed aquaculture. To acquire basic information on the influential extent of aquaculture effluent on carrying capacity of coastal waters, environmental surveys were conducted to investigate the behavior of nutrients and primary production covering the whole bay area and more intensively around the red seabream, Pagrus major, aquaculture cages in Gokasho Bay, Mie, Japan. Seawater samples were collected monthly at 3 depths (surface, mid-layer and bottom) at 19 points in the bay, and seasonally at surface and depth of 5 m (i.e. midpoint of the cage depth) at 47 points approximately 20 m apart from one another around the red seabream aquaculture cages. The concentration of the following nutrients was analyzed: dissolved inorganic nitrogen (DIN: NH4-N, NO2-N, NO3-N), PO4-P and SiO2-Si. A CTD was used to obtain the vertical profile of temperature, salinity, dissolved oxygen (DO), and chlorophyll a from the surface to the bottom. Although the DIN-N and DO levels in December 2016 were comparable to those from the same month in 1980s where aquaculture was more prosperous, the PO4-P level was an order of magnitude lower probably due to diminished aquaculture production and improved feeding management, including the switch from raw bait to formulated feed. During a diatom bloom observed in November 2016, the depletion of SiO2-Si implied that the availability of Si, but not N or P, was the limiting factor for the diatom growth in Gokasho Bay. There were spots with higher NH4-N levels at the center and 20 m outside the red seabream cage area in January 2017. The chlorophyll a level was higher and NO3-N was lower around the cages than in the surrounding water. The observed lower NO3-N concentration may indicate that the enhanced primary production triggered by the NH4-N supply from the aquaculture effluent rapidly consumed not only NH4-N but the background NO3-N in the area, thereby indicating that DIN-N excreted from red seabream may not travel a long distance from the cages before absorbed by primary producers. In order to fertilize seaweed with red seabream aquaculture effluent, the seaweed should be cultured near the fish cages. The elevation of chlorophyll a indicates the possibility of productive co-culture of red seabream and bivalves.
言語 en
bibliographic_information ja : 水産研究・教育機構研究報告
en : Bulletin of Japan Fisheries Research and Education Agency

巻 49, p. 121-127, ページ数 7, 発行日 2019-02
出版者
出版者 水産研究・教育機構
言語 ja
出版者
出版者 Japan Fisheries Research and Education Agency
言語 en
item_10002_source_id_9
収録物識別子タイプ PISSN
収録物識別子 2432-2830
item_10002_source_id_11
収録物識別子タイプ NCID
収録物識別子 AA12767505
item_10002_relation_11
識別子タイプ EISSN
関連識別子 2758-3953
情報源
識別子タイプ Local
関連識別子 fra_k_49_121
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
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