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Fisheries Science

, Volume 76, Issue 1, pp 147–153 | Cite as

Difference in the stable nitrogen isotope ratio of Sargassum piluliferum (Phaeophyceae: Fucales) associated with fish and pearl oyster aquaculture facilities

  • Hiroaki Matsuo
  • Nobuyuki Matsuka
  • Koji Omori
  • Yoshitsugu Koizumi
  • Ichiro TakeuchiEmail author
Original Article Environment

Abstract

In order to estimate the nitrogen loading from fish aquaculture facilities, we studied the nitrogen and carbon stable isotope ratios (δ15N and δ13C, respectively) in the brown macroalga Sargassum piluliferum and small amphipod crustaceans Caprella spp., both of which are lower trophic level biota found at fish and pearl oyster aquaculture facilities situated along the eastern coast of the Uwa Sea, Japan. This coastal region is one of the least populated areas along the Japanese coast. The mean concentrations of chlorophyll a, dissolved inorganic nitrogen, dissolved inorganic phosphate, and dissolved silicate-Si were 1.5- to 2-fold higher in samples from the fish aquaculture facilities than in those from the pearl oyster aquaculture facilities, indicating that the fish aquaculture facilities were associated with nitrogen loading. The δ15N abundance level in S. piluliferum collected from the fish aquaculture facilities was significantly higher (1.3‰) than that in macroalga collected at the pearl oyster aquaculture facilities, whereas that in Caprella spp., primary consumers, was only slightly higher (0.3‰). The feeding style of Caprella spp., which depends on suspended particulate organic matter and attached microalgae, is considered to the primary causal factor for the lack of a significant difference in δ15N abundance level between the two types of aquaculture facilities. Based on these results, we conclude that S. piluliferum found in close proximity of aquaculture facilities is a suitable organism for monitoring nitrogen loading from fish aquaculture facilities, through the analysis of δ15N.

Keywords

Aquaculture Caprella spp. Coastal waters Macroalga Nitrogen and carbon stable isotope ratios (δ15N, δ13C) Nitrogen loading Sargassum piluliferum 

Notes

Acknowledgments

We wish to thank Mr. M. Mitsuoka and his family for their kind support in collecting biological samples. This study was partially supported by a Research Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (No. 19310024) and Global COE Program from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Copyright information

© The Japanese Society of Fisheries Science 2009

Authors and Affiliations

  • Hiroaki Matsuo
    • 1
  • Nobuyuki Matsuka
    • 1
  • Koji Omori
    • 2
  • Yoshitsugu Koizumi
    • 3
  • Ichiro Takeuchi
    • 1
    Email author
  1. 1.Department of Life Environment Conservation, Faculty of AgricultureEhime UniversityMatsuyamaJapan
  2. 2.Center for Marine Environmental Studies (CMES)Ehime UniversityMatsuyamaJapan
  3. 3.Ehime Prefectural Fisheries Research CenterUwajimaJapan

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