Fisheries Science

, Volume 81, Issue 1, pp 43–51 | Cite as

Diet, growth, and abundance of two seagrass bed fishes along a pollution gradient caused by milkfish farming in Bolinao, northwestern Philippines

  • Mikio Watai
  • Yohei Nakamura
  • Kentaro Honda
  • Klenthon O. Bolisay
  • Toshihiro Miyajima
  • Masahiro Nakaoka
  • Miguel D. Fortes
Original Article Biology


The present study clarified the impacts of aquaculture pollution on the surrounding seagrass bed fishes by comparing the diet, growth, and abundance of Parupeneus barberinus and Acreichthys tomentosus along a pollution gradient caused by intensive milkfish Chanos chanos farming in Bolinao, northwestern Philippines. The two fish species and potential food items exhibited increasingly enriched δ13C values with greater distance from the milkfish farming area, thereby indicating that stable carbon isotopes facilitated good discrimination between fishes from polluted and unpolluted areas. P. barberinus fed on epi-/benthic crustaceans, whereas A. tomentosus consumed a wide range of food, including invertebrates and plant materials in the unpolluted areas, but zooplankton were the most commonly predated food items in the polluted areas for both species. The growth rate of P. barberinus was marginally lower in the polluted area than in the unpolluted area, whereas that of A. tomentosus did not differ between the two areas. The abundance of both species did not differ significantly between the polluted and unpolluted areas, but the growth patterns of the two species suggest that A. tomentosus has greater physiological tolerance of the polluted environment than P. barberinus.


Gut content Milkfish farming Otolith Pollution Seagrass bed fish Stable carbon isotope Philippines 



We are grateful to Go GA, Leopardas V, Pantallano A, Leriorato J, and Hamamitsu Y for assistance with the field work. We are also grateful to the Local Government Unit and Nadaoka K for logistic support and Umezawa U, Morimoto N, and Yamamoto T for providing water quality data. The constructive comments on the manuscript by anonymous reviewers were much appreciated. This study was supported by Japan Science and Technology Agency/Japan International Cooperation Agency, Science and Technology Research Partnership for Sustainable Development, for the project Coastal Ecosystem Conservation, and Adaptive Management under Local and Global Environmental Impacts in the Philippines (CECAM).


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Copyright information

© Japanese Society of Fisheries Science 2014

Authors and Affiliations

  • Mikio Watai
    • 1
  • Yohei Nakamura
    • 1
    • 2
  • Kentaro Honda
    • 3
  • Klenthon O. Bolisay
    • 4
  • Toshihiro Miyajima
    • 5
  • Masahiro Nakaoka
    • 3
  • Miguel D. Fortes
    • 4
  1. 1.Graduate School of Integrated Arts and SciencesKochi UniversityNankokuJapan
  2. 2.Graduate School of Kuroshio ScienceKochi UniversityNankokuJapan
  3. 3.Akkeshi Marine Station, Field Science Center for Northern BiosphereHokkaido UniversityAkkeshiJapan
  4. 4.The Marine Science InstituteUniversity of the PhilippinesQuezon CityPhilippines
  5. 5.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwa-ShiJapan

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