A STUDY ON THE SHAPE OF A STRUCTURE FOR MITIGATING THE IMPACT OF LONG-TERM HYPOXIA OCCURRING IN ALL LAYERS ON <i>TRIDENTIGER OBSCURUS</i>
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- KOZUKI Yasunori
- 徳島大学 環境防災研究センター
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- TANABE Naoki
- 徳島大学大学院 先端技術科学教育部
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- IWAMI Kazuki
- 徳島大学大学院 先端技術科学教育部
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- HIRAKAWA Rin
- 徳島大学大学院 先端技術科学教育部
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- SAITO Minoru
- 徳島大学生物資源産業学部水圏教育研究センター
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- YAMANAKA Ryoichi
- 徳島大学 環境防災研究センター
Bibliographic Information
- Other Title
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- チチブを対象とした長時間の全層貧酸素化の生態影響を緩和させる生物避難場に関する調査実験
- チチブ オ タイショウ ト シタ チョウジカン ノ ゼン ソウヒンサンソカ ノ セイタイ エイキョウ オ カンワ サセル セイブツ ヒナンジョウ ニ カンスル チョウサ ジッケン
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Description
<p> The shape of a structure capable of mitigating the impact of hypoxia in water environments where hypoxia occurs in all layers from the bottom to the top was studied. The Amagasaki Canal is chronically hypoxic; occasionally all layers are hypoxic. The only fish confirmed to live in this canal throughout the year is the benthonic fish Tridentiger obscurus. This study showed that if a structure with gaps is installed in the surface layer, when only the bottom layer is hypoxic, the fish uses it as a substitute habitat. When all layers are hypoxic, the fish swims above the plate submerged near the water’s surface to obtain aminiscule amount of reaerated oxygen and raise its nose to the surface. Under this condition, Tridentiger obscurus’ preference for and tendency to occupy gaps is absent. The aforementioned observations show that an effective means to mitigate the impact of hypoxia on Tridentiger obscurus is installation of structures with gaps and a bottom surface that the fish can settle on near the water surface.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 75 (2), I_1001-I_1006, 2019
Japan Society of Civil Engineers