Comparison of carbon sources for Trichiurus japonicus and other benthic fishes in the Kii Channel, Japan, based on carbon and nitrogen stable isotope ratios

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  • DOIUCHI RYU
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • YASUE NAOTAKA
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • TAKEUCHI TERUFUMI
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • YAMAUCHI MAKOTO
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • OKUYAMA YOSHIO
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • SUWA TSUYOSHI
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • MUKAINO MIKIO
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • KOKUBO TOMOYOSHI
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries
  • HAYA HARUO
    Fisheries Experimental Station, Wakayama Research Center of Agriculture, Forestry and Fisheries

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Other Title
  • 炭素・窒素安定同位体比に基づく紀伊水道におけるタチウオとその他の底生魚類の炭素源の比較
  • タンソ チッソ アンテイ ドウイタイヒ ニ モトズク キイスイドウ ニ オケル タチウオ ト ソノタ ノ テイセイギョルイ ノ タンソゲン ノ ヒカク

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Abstract

  To evaluate the relative importance of possible carbon sources such as phytoplankton and benthic microalgae for Trichiurus japonicus, 32 specimens were collected from the Kii Channel, Japan, and their carbon and nitrogen stable isotope distributions were analyzed. Furthermore, 32 fishes representing an additional 13 benthic species were analyzed for comparison. The δ13C and δ15N values of T. japonicus were −16.2±0.5‰ and 17.6±1.2‰, respectively, and differed from those of other benthic species (−15.4±0.7‰ and 16.1±1.7‰, respectively). The relative contributions of phytoplankton and benthic microalgae as carbon sources of fishes were calculated. The contribution of phytoplankton for T. japonicus (51.6%) was higher than that for other benthic fishes (3.1%-43.0%). This likely reflected the diel vertical migration pattern of T. japonicus during which it feeds mainly on fishes and crustaceans present in the pelagic rather than the benthic environment.<br>

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