Abstract
Fishponds exhibit high natural retention potential for phosphorus, which enters the ponds from non-point, diffuse and point sources, as well as from aquaculture management. Results of phosphorus mass balance monitoring of nine large fishponds (60–449 ha) over 2010–2014 revealed total phosphorus retention ranging between −66 % (sink) and +52 % (release) of the P loads from inflows, i.e. specific P retention varied between −7.83 g m−2 (sink) and 1.00 g m−2 (release) of surface area, per one fish production cycle. Retention of P was eliminated by application of fertilizers (with simultaneous fish feed application) during fish production process and/or by massive P release from fishpond sediments after previous heavy loads. P retention could be increased by preference of surface water outflow instead of bottom discharge and/or also by minimizing of emissions of suspended sediment particles during a fish harvesting. The real role of fishponds in transport processes of P throughout a watershed could be eruditely assessed only by following newly proposed method called “new approach” when P input (via inflows) and P output (via outflows) are compared with natural fishpond ability to retain P, which is determined by a simple model proposed by Hejzlar et al. (2006). For evaluation of effect of actual fishery management, the “culture-balance” method is suitable too. If the P inputs (stocked fish, fertilizing, feeding) and outputs (harvested fish) derived from fishery practice were in balance, the P retention did not decline. However, in condition of inputs > outputs, the P retention appreciably ceased or was totally eliminated. It was concluded that fishponds could serve as an important sink of P transported throughout a watershed even under semi-intensive fish (common carp) production condition.
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Acknowledgments
This study was financially supported by the Ministry of Education, Youth and Sports of the Czech Republic—projects “CENAKVA” (No. CZ.1.05/2.1.00/01.0024) and “CENAKVA II” (No. LO1205 under the NPU I program). The authors are grateful to fishery companies Rybářství Třeboň a.s., Rybářství Hluboká cz. s.r.o, Blatenská ryba, s.r.o and Rybářství Kardašova Řečice s.r.o. for providing fishery production data.
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Guest editors: Zuzana Linhartová and Jan Mráz/Carp pond aquaculture, product processing and quality.
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Potužák, J., Duras, J. & Drozd, B. Mass balance of fishponds: are they sources or sinks of phosphorus?. Aquacult Int 24, 1725–1745 (2016). https://doi.org/10.1007/s10499-016-0071-4
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DOI: https://doi.org/10.1007/s10499-016-0071-4