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Improved growth of flathead flounder Hippoglossoides dubius in hypoxic waters in Funka Bay, Japan

Authors
  • Inagaki, Yuta1
  • Takatsu, Tetsuya2
  • Kimura, Masafumi1
  • Kano, Yota2
  • Takahashi, Toyomi2
  • Kamei, Yoshihiko3
  • Kobayashi, Naoto3
  • Maeda, Tatsuaki2
  • 1 Hokkaido University, Graduate School of Fisheries Sciences, 3–3–1 Minato, Hakodate, Hokkaido, 041-8611, Japan , Hakodate (Japan)
  • 2 Hokkaido University, Faculty of Fisheries Sciences, 3–3–1 Minato, Hakodate, Hokkaido, 041-8611, Japan , Hakodate (Japan)
  • 3 Hokkaido University, Training Ship Ushio-maru, Faculty of Fisheries, Minato, Hakodate, Hokkaido, 041-8611, Japan , Hakodate (Japan)
Type
Published Article
Journal
Fisheries Science
Publisher
Springer Japan
Publication Date
Jun 18, 2014
Volume
80
Issue
4
Pages
725–734
Identifiers
DOI: 10.1007/s12562-014-0761-7
Source
Springer Nature
Keywords
License
Yellow

Abstract

To identify the factors that influence the growth rate of flathead flounder Hippoglossoides dubius in Funka Bay, Japan, we studied temporal changes in the growth of this species and its prey from 1989 to 2012. The lowest growth rate of H. dubius was recorded in the 1995 year-class, which had experienced severe hypoxia between 1995 and 1997. However, the highest growth rate was recorded in the 2007 year-class, which had experienced hypoxia between 2009 and 2011. In 2000 and 2001, small-sized flounder (<200 mm TL) from the 1995 year-class were feeding on mysidaceans, whereas those from other year-classes fed on small Ophiura spp. (<9 mm in disc diameter) in 2009, 2011, and 2012. Small Ophiura spp. were more abundant in 2007 and 2011 than in 2002 and 2003. Successful recruitment of Ophiura spp. took place between 2007 and 2011 and cohorts from these years could tolerate hypoxia. This suggests that food availability improved under hypoxic conditions, which led to improved growth in small flounders. Large flounders (≥200 mm TL) from all year-classes fed on prickleback fishes (Stichaeidae) and walleye pollock Gadus chalcogrammus juveniles. The growth of large flounders was enhanced by an increase in the abundance of Stichaeidae fishes and G. chalcogrammus juveniles.

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