Maintaining economic value of ecosystem services whilst reducing environmental cost: a way to achieve freshwater restoration in China

PLoS One. 2015 Mar 24;10(3):e0120298. doi: 10.1371/journal.pone.0120298. eCollection 2015.

Abstract

Freshwater fisheries are central to food security in China and this remains one of the most important priorities for the growing human population. Thus, combining ecosystem restoration with economics is pivotal in setting successful conservation in China. Here, we have developed a practical management model that combines fishery improvement with conservation. For six years, a ban on fertilizer and a reduction of planktivorous fish stocking along with the introduction of both mandarin fish Siniperca chuatsi and Chinese mitten crab Eriocheir sinensis was apparent in Wuhu Lake, a highly eutrophic lake located in the middle reaches of the Yangtze River. Annual fish yield decreased slightly after the change in management, whereas fisheries income increased 2.6 times. Mandarin fish and Chinese mitten crab accounted for only 16% of total fisheries production but for 48% of total fisheries income. During this six year period, water clarity increased significantly from 61 cm to 111 cm. Total nitrogen, total phosphorus and chlorophyll decreased significantly from 1.14 to 0.84 mg/L, 0.077 to 0.045 mg/L, and 21.45 to 11.59 μg/L respectively, and macrophyte coverage increased by about 30%. Our results showed that the ecological status of shallow lakes could be rapidly reversed from eutrophic to oligotrophic using simple biomanipulation, whilst maintaining fisheries economic value. It also offers a better approach to shallow fisheries lake management in Asia where traditionally the stocking of Chinese carp and use of fertilizers is still popular.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • China
  • Conservation of Natural Resources / economics
  • Conservation of Natural Resources / methods*
  • Ecosystem
  • Environmental Monitoring
  • Fisheries / economics
  • Fisheries / methods*
  • Fishes
  • Fresh Water / analysis*
  • Water Quality

Grants and funding

This research was funded by the State Key Laboratory of Freshwater Ecology and Biotechnology (No. 2011FBZ28) and Agro-scientific Research in the Public Interest in China (No. 201303056). The data analysis and writing of the manuscript were partly supported by “Hundred Talents Program” of the Chinese Academy of Sciences (SIDSSE-BR-315 201201, Y410012), Knowledge Innovation Program of the Chinese Academy of Sciences (SIDSSE-316 201210), and Science and Technology Cooperation Project of Sanya City and Chinese Academy of Sciences (2013YD75). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.