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No cascading negative effects of piscivorous fish stocking on phytoplankton biomass in subtropical shallow mesocosms: implications for lake restoration by biomanipulation

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Title: No cascading negative effects of piscivorous fish stocking on phytoplankton biomass in subtropical shallow mesocosms: implications for lake restoration by biomanipulation
Authors: Tian Qian, Fei Diao, Erik Jeppesen, Yanqing Han, Kuanyi Li, Hu He
Source: Qian, T, Diao, F, Jeppesen, E, Han, Y, Li, K & He, H 2025, 'No cascading negative effects of piscivorous fish stocking on phytoplankton biomass in subtropical shallow mesocosms : implications for lake restoration by biomanipulation', Hydrobiologia, vol. 852, no. 4, pp. 823-835. https://doi.org/10.1007/s10750-024-05727-8
Publisher Information: Springer Science and Business Media LLC, 2024.
Publication Year: 2024
Subject Terms: Crucian carp, Mandarin fish, Shallow lake restoration, Eutrophication, Top-down control, Zooplankton
Description: Biomanipulation by piscivore stocking has been widely used for restoration of temperate shallow lakes, but long-term results have been mixed. In warm (i.e., subtropical/tropical) lakes where omni-benthivorous fish prevail, the effects of piscivore stocking on small fish, plankton communities, and water quality have not been well elucidated yet. Here, we conducted a mesocosm experiment in the subtropics to examine the top-down and bottom-up effects of stocking of a native piscivorous fish, mandarin fish (Siniperca scherzeri). The experiment consisted of two treatments (piscivore present/absent) in triplicate, lasting for 90 days and including two periods. Crucian carp (Carassius carassius) were stocked twice to simulate the recruitment of small fishes. Our results showed that stocking of mandarin fish significantly reduced the abundance of crucian carp but did not increase zooplankton biomass nor reduced the phytoplankton biomass, the concentrations of nutrients or suspended solids, suggesting that both top-down and bottom-up control of phytoplankton were unaffected by stocking mandarin fish. Moreover, the presence of mandarin fish did not help maintain a clear water state in the period of crucian carp recruitment. Our results indicate that piscivore stocking may not help control phytoplankton biomass in subtropical shallow mesocosms, at least on the short term.
Document Type: Article
Language: English
ISSN: 1573-5117
0018-8158
DOI: 10.1007/s10750-024-05727-8
Access URL: http://www.scopus.com/inward/record.url?scp=85207585678&partnerID=8YFLogxK
https://pure.au.dk/portal/en/publications/6913c737-7dab-453e-8049-52aeae107b6f
https://doi.org/10.1007/s10750-024-05727-8
Rights: Springer Nature TDM
Accession Number: edsair.doi.dedup.....94e9a1b43460ebc180e20561d77cbd00
Database: OpenAIRE
Description
Abstract:Biomanipulation by piscivore stocking has been widely used for restoration of temperate shallow lakes, but long-term results have been mixed. In warm (i.e., subtropical/tropical) lakes where omni-benthivorous fish prevail, the effects of piscivore stocking on small fish, plankton communities, and water quality have not been well elucidated yet. Here, we conducted a mesocosm experiment in the subtropics to examine the top-down and bottom-up effects of stocking of a native piscivorous fish, mandarin fish (Siniperca scherzeri). The experiment consisted of two treatments (piscivore present/absent) in triplicate, lasting for 90 days and including two periods. Crucian carp (Carassius carassius) were stocked twice to simulate the recruitment of small fishes. Our results showed that stocking of mandarin fish significantly reduced the abundance of crucian carp but did not increase zooplankton biomass nor reduced the phytoplankton biomass, the concentrations of nutrients or suspended solids, suggesting that both top-down and bottom-up control of phytoplankton were unaffected by stocking mandarin fish. Moreover, the presence of mandarin fish did not help maintain a clear water state in the period of crucian carp recruitment. Our results indicate that piscivore stocking may not help control phytoplankton biomass in subtropical shallow mesocosms, at least on the short term.
ISSN:15735117
00188158
DOI:10.1007/s10750-024-05727-8