Evaluation of shrimp polyculture system in Thailand based on stable carbon and nitrogen isotope ratios

Authors

  • HISASHI YOKOYAMA,

    Corresponding author
    1. National Research Institute of Aquaculture, Fisheries Research Agency, Nansei, Mie 516-0193,
      *Corresponding author: Tel: 81-599-66-1830. Fax: 81-599-66-1920. Email: hyoko@fra.affrc.go.jp
    Search for more papers by this author
  • JUNYA HIGANO,

    1. Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki 305-8686,
    Search for more papers by this author
    • a Present address: National Research Institute of Aquaculture, Nansei, Mie 516-0193, Japan.

  • KUMIKO ADACHI,

    1. National Research Institute of Fisheries Engineering, Hasaki, Ibaraki 314-0421, Japan and
    Search for more papers by this author
  • YUKA ISHIHI,

    1. National Research Institute of Aquaculture, Fisheries Research Agency, Nansei, Mie 516-0193,
    Search for more papers by this author
  • YOSHIHIRO YAMADA

    1. National Research Institute of Aquaculture, Fisheries Research Agency, Nansei, Mie 516-0193,
    Search for more papers by this author
    • b Present address: Kagawa University, Miki, Kagawa 760-8521, Japan.


*Corresponding author: Tel: 81-599-66-1830. Fax: 81-599-66-1920. Email: hyoko@fra.affrc.go.jp

Abstract

ABSTRACT: To quantify the contribution by cocultured animals to waste assimilation in an intensive shrimp farm in Thailand, the food web structures of the macrobenthos in a reservoir pond, a shrimp culture pond and water treatment ponds were examined using the stable C and N isotope ratio technique. Seawater for aquaculture was drawn from a creek, and stored in a reservoir pond, used for farming the banana prawn Fenneropenaeus merguiensis in culture ponds, and then recycled through treatment ponds where the green mussel Perna viridis was cultured to remove organic wastes discharged from the farming. The clam worm Nereididae sp. and the mud creeper Cerithideopsilla cingulata in the culture pond had δ 13C values of −21.0‰ and −18.4‰, respectively, suggesting that shrimp feed (mean δ 13C = −20.7‰) was the main food source for these species. The δ 13C analysis also suggested that sediments (−23.7‰) in the reservoir pond and particulate organic matter (POM) (−24.0‰) and/or sediments (−25.0‰) in the treatment pond supplied carbon for most macrobenthic animals. However, green mussels in the treatment pond had a mean δ 13C value of −20.5‰, suggesting that shrimp feed was the main food source for this species.

Ancillary