Impact of Fish Farming on Phosphorus in Reservoir Sediments
Open Access
- 18 November 2015
- journal article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 5 (1), 16617
- https://doi.org/10.1038/srep16617
Abstract
Fish farming has seriously influenced the aquatic environment in Sancha reservoir in SW China since 1985 and has been strongly restricted since 2005. Thus, phosphorus speciation in a sediment core dated between 1945 and 2010 at cm-resolution and in surface sediments from Sancha reservoir may allow us track how fish farming impacts phosphorus dynamics in lake sediments. Fish farming shifts the major binding forms of phosphorus in sediments from organic to residual phosphorus, which mostly originated from fish feed. Sorption to metal oxides and association with organic matters are important mechanisms for phosphorus immobilisation with low fish farming activities, whereas calcium-bound phosphorous had an essential contribution to sediment phosphorus increases under intensive fish framing. Notwithstanding the shifting, the aforementioned phosphorus fractions are usually inert in the lake environment, therefore changing phosphorus mobility little. The use of fish feed and water-purification reagents, the most important additives for fish farming, introduce not only phosphorus but also large amounts of sand-sized minerals such as quartz into the lake, to which phosphorus weakly sorbs. The sand-sized minerals as additional sorbents increase the pool of easily mobilisable phosphorus in sediments, which will slow down the recovery of reservoir water due to its rapid re-mobilisation.This publication has 33 references indexed in Scilit:
- Phosphorus fractionation in different trophic sediments of lakes from different regions, ChinaJournal of Environmental Monitoring, 2011
- Oxygen Controls the Phosphorus Release from Lake Sediments – a Long‐Lasting Paradigm in LimnologyInternational Review of Hydrobiology, 2008
- Assessment effects of cage culture on nitrogen and phosphorus dynamics in relation to fallowing in a shallow lake in ChinaAquaculture International, 2008
- Characteristics of organic phosphorus fractions in different trophic sediments of lakes from the middle and lower reaches of Yangtze River region and Southwestern Plateau, ChinaEnvironmental Pollution, 2008
- Characteristics of fractional phosphorus distribution in sediment of fish farming area at Lake Kasumigaura, JapanNIPPON SUISAN GAKKAISHI, 2008
- Soil phosphorus forms and their variations in depressional and riparian freshwater wetlands (Sanjiang Plain, Northeast China)Geoderma, 2006
- Kinetics of alkaline phosphatase in lake sediment associated with cage culture of Oreochromis niloticusAquaculture, 2001
- Nutrient budgets in intensive shrimp ponds: implications for sustainabilityAquaculture, 1998
- Development of a sequential extraction method for different forms of phosphorus in marine sedimentsLimnology and Oceanography, 1992
- Chemical fluxes and mass balances in a marine fish cage farm. II PhosphorusMarine Ecology Progress Series, 1991