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Spatial distribution and dietary overlap between Japanese anchovy Engraulis japonicus and moon jellyfish Aurelia aurita in the Seto Inland Sea, Japan
Shoji, J.; Mizuno, K.-I.; Yamamoto, M.; Miller, T.W.; Hamaoka, H.; Omori, K. (2009). Spatial distribution and dietary overlap between Japanese anchovy Engraulis japonicus and moon jellyfish Aurelia aurita in the Seto Inland Sea, Japan. Sci. Mar. (Barc.) 73(Suppl. 1): 191-198. https://hdl.handle.net/10.3989/scimar.2009.73s1191
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, meer
Peer reviewed article  

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Trefwoorden
    Diëten; Geografische verspreiding; Ichthyoplankton; Isotope ratios; Aurelia aurita (Linnaeus, 1758) [WoRMS]; Engraulis japonicus Temminck & Schlegel, 1846 [WoRMS]; INW, Japan, Japan Inland Sea, Hiuchi Nada; Marien
Author keywords
    ichthyoplankton; stable isotope analysis; Sea of Hiuchi; Hiroshima Bay

Auteurs  Top 
  • Shoji, J.
  • Mizuno, K.-I.
  • Yamamoto, M.
  • Miller, T.W.
  • Hamaoka, H.
  • Omori, K.

Abstract
    Biological and physical Surveys Were conducted in order to investigate the relationship between environmental conditions and the distribution of ichthyoplankton and jellyfish, and dietary overlap between the ichthyoplankton and jellyfish in the Seto Inland Sea (SIS), Japan. Ichthyoplankton, copepods, and jellyfish were collected during two cruises in July 2005 in the Sea of Hiuchi and in July 2006 in Hiroshima Bay within the SIS. Sea surface temperature (degrees C), salinity, bottom-layer dissolved oxygen (mg l(-1)) and the abundance (no. m(-2)) of fish eggs and larvae were significantly higher in the Sea of Hiuchi. Japanese anchovy was most dominant (69.3% in number of eggs and 52.3% in number of larvae) among, the ichthyoplankton. Mean jellyfish biomass (g m(-2)) in Hiroshima Bay was significantly higher (50-folds) than that ill the Sea of Hiuchi. Moon jellyfish was the most dominant among the jellyfish collected, accounting for 85.6% in wet weight. Surface temperature had a significant effect oil fish egg and larval distribution: abundance of fish eggs and larvae increased with increasing temperature. Jellyfish abundance was negatively correlated with the bottom-layer oxygen concentration. Stable isotope analysis indicated dietary overlap between the Japanese anchovy and the moon jellyfish in Hiroshima Bay.

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