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- Title
Influence of tubificid worms on nutrient fluxes across water-sediment interface in fish farm settling ponds.
- Authors
Puigagut, J.; Chazarenc, F.; Comeau, Y.
- Abstract
The influence of tubificid worms on nutrient translocation from water to fish farm sediments accumulating in settling ponds was addressed under laboratory conditions. Small microcosms of 0.5 L were filled up with 35 g of sludge from a fish farm settling pond and 0.15 L of filtered settling pond water. The experimental set up consisted of one control line (no worms added), a second experimental line with 1 mg of tubificid worms·g-2 fresh sediment (550 individuals·m-2) and a third experimental line with 40 mg of tubificid worms·g-1 fresh sediment (22 000 individuals·m-2). Nutrients translocation was determined by monitoring overlaying water concentration of ammonia, nitrate and phosphate for ten days. Results showed that abundances of 550 individuals·m-2 had no significant influence on the fluxes of nutrients here considered. However, the influence of higher abundances of tubificids (22 000 individuals·m-2) was of significant extent on the translocation of nitrate and phosphate. Accordingly, bioturbation of tubificids caused 55% lower nitrate uptake by the sediment when compared to control conditions. Phosphorus released by the sediments of the control condition was ca. 90% higher than that recorded under abundances of tubificids (22 000 individuals·m-2). Results obtained allowed us to estimate that fish farm settling ponds highly colonized by tubificid worms (22 000 individuals·m-2) may contribute to decrease phosphorus discharge (in terms of soluble phosphorus) in ca. 5 g of P·ton-1 of fish produced.
- Subjects
WORMS; FISH farming; NUTRIENT interactions; POND sediments; SEWAGE sludge
- Publication
Knowledge & Management of Aquatic Ecosystems, 2014, Issue 413, p1
- ISSN
1961-9502
- Publication type
Article
- DOI
10.1051/kmae/2014010