TIDAL FLUCTUATION OF SALINITY AND DISTRIBUTION OF DOMINANT FISH SPECIES IN UDARA RIVER ESTUARY, AMITORI BAY, IRIOMOTE ISLAND.

• INOUE Hiroyuki

  東海大学 沖縄地域研究センター

• MURAKAMI Tomokazu

  （国研）防災科学技術研究所 水・土砂防災研究部門

• NANJO Kusuto

  （国研）水産大学校生物生産学科

• MIZUTANI Akira

  東海大学 沖縄地域研究センター

• KOHNO Hiroyoshi

  東海大学 沖縄地域研究センター

Bibliographic Information

Other Title

• 西表島網取湾ウダラ川汽水域の潮汐に伴う塩分動態および優占する魚類の分布

Abstract

 Tidal fluctuations in salinity, water temperature, turbidity and distributions of three dominant fish species (the freshwater demoiselle Neopomacentrus taeniurus, cardinalfish Fibramia amboinensis, and jungle perch Kuhlia rupestris) detected by visual transect surveys were investigated in the Udara River estuary of Amitori Bay around Iriomote Island, southern Japan in March and June 2013. The estuarine species N. taeniurus frequently occurred at several depth levels in the lower and middle estuaries with high salinity (29-34‰) at high tide, and at deeper water depths (below 50 cm) with high salinity (ca. 29‰) at low tide. The estuarine species Fibramia amboinensis was restricted to the middle estuary with a salinity range of 19-29‰ at both tides. The catadromous Kuhlia rupestris was restricted to the upper estuary with low salinity (ca. 3‰) at both tides. These results suggest that responses to tidal salinity fluctuations were species-specific in the tropical estuary. Some species actively relocated to select the most suitable salinity levels in accordance with the tides, while others remained in a spatially limited area at both tides, tolerating a broad range of salinity or adapting to particularly low salinity.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72 (2), I_1087-I_1092, 2016

  Japan Society of Civil Engineers

Keywords

• Iriomote island
• estuary
• distribution
• dominant fish species
• salinity

Details

• CRID: 1390282680329808640
• NII Article ID: 130005263225
• DOI: 10.2208/jscejoe.72.i_1087
• ISSN: 21854688
• Web Site: https://www.jstage.jst.go.jp/article/jscejoe/72/2/72_I_1087/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed