Wu, Pianpian
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
Research article2020Peer reviewed
Jing, Min; Lin, Dan; Wu, Pianpian; Kainz, Martin J.; Bishop, Kevin; Yan, Haiyu; Wang, Rui; Wang, Qing; Li, Qiuhua
Aquaculture can affect the polyunsaturated fatty acids (PUFA) and mercury (Hg) in fish by altering their diet. Here, planktivorous (silver carp and bighead carp), omnivorous and carnivorous fish with different dietary strategies were selected from two reservoirs, one with on-going aquaculture (WJD) and another without aquaculture (HF) in Southwest China. We compared the total mercury (THg), methylmercury (MeHg) contents and PUFA profiles of fish and their potential diets in these two reservoirs. THg and MeHg contents in omnivorous and carnivorous fish were lower from the WJD Reservoir, which is related to the lower THg and MeHg contents in the artificial fish food. THg and MeHg contents in silver carp from the WJD Reservoir were lower than those from the HF Reservoir, while they were similar in bighead carps from the two reservoirs. The Hg variation in planktivorous fish were inconsistent with that in plankton. THg contents in phyto- and zooplankton from the HF Reservoir were higher than those from the WJD Reservoir, yet their MeHg contents were similar. Artificial fish food which contained higher total PUFA eicosapentaenoic (EPA; 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3), significantly increased the total PUFA and EPA + DHA contents in carnivorous fish, but had less effect on that in omnivorous fish from the WJD Reservoir. Eutrophication caused by aquaculture reduced total PUFA and EPA + DHA contents of plankton in WJD, yet did not reduce those in planktivorous fish. The impacts of aquaculture on Hg and PUFA accumulated in fish were varied among different fish species, and the mechanism needs further exploration. (C) 2019 Elsevier Ltd. All rights reserved.
Polyunsaturated fatty acids; Mercury; Bioaccumulation; Aquaculture
Environmental Pollution
2020, Volume: 257, article number: 113543Publisher: ELSEVIER SCI LTD
Non-toxic environment
Lakes and watercourses
SDG6 Clean water and sanitation
Fish and Aquacultural Science
Environmental Sciences
DOI: https://doi.org/10.1016/j.envpol.2019.113543
https://res.slu.se/id/publ/104874