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Ecological Research

, Volume 22, Issue 1, pp 165–171 | Cite as

Tidal and diurnal variations in larval fish abundance in an estuarine inlet in Ariake Bay, Japan: implication for selective tidal stream transport

  • Md. Shahidul Islam
  • Manabu Hibino
  • Masaru Tanaka
Note and Comment

Abstract

We have conducted a preliminary study of tidal and diurnal variations in the distribution of dominant larval and juvenile fishes in the Chikugo River inlet (Ariake Bay, Kyushu, Japan) to determine whether selective tidal stream transport (STST) occurs. Larval and juvenile fish were collected from the mesohaline zone of the Chikugo River inlet during spring 2002. Temperature, salinity, depth, and current velocity were measured. Larval and juvenile abundance were compared among four tidal conditions, flooding tide, high tide, ebbing tide, and low tide, and between day and night. A total of 12 families, 15 species, and 5,577 individuals were collected. Temperature did not vary significantly with tidal conditions whereas salinity, depth, and current velocity varied significantly. Salinity also was correlated significantly and positively with depth. The abundance of most of the fishes was correlated positively and significantly with salinity and depth. Lateolabrax japonicus, Trachidermus fasciatus, Acanthogobius hasta, and other gobiid larvae (Gobiidae spp.) were significantly more abundant during high tide; in contrast, Coilia nasus and Neosalanx reganius were most abundant during low tide. The abundance of most of the fishes was higher during high tides at night than during the day, indicating the existence of STST, which may be strategically associated with ascending progress to upstream nursery areas.

Keywords

Tidal and diurnal variation Selective tidal stream transport Larval and juvenile fishes Chikugo estuary Ariake Bay 

Notes

Acknowledgment

This research was supported by a research grant provided by the Japanese Government Ministry of Education, Culture, Sports, Science and Technology (Monbukagakusho, MEXT). The first author acknowledges financial support provided by the “Monbukagakusho” (through a “Monbukagakusho” scholarship) during his stay in Japan. We gratefully acknowledge the comments of two anonymous reviewers, which substantially improved our manuscript.

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Copyright information

© The Ecological Society of Japan 2006

Authors and Affiliations

  • Md. Shahidul Islam
    • 1
  • Manabu Hibino
    • 2
  • Masaru Tanaka
    • 1
  1. 1.Laboratory of Estuarine Ecology, Field Science Education and Research Center, Graduate School of AgricultureKyoto UniversityKyotoJapan
  2. 2.Department of Sea-FarmingAichi Fisheries Promotion FundAichiJapan

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