Influence of tubificid worms on nutrient fluxes across water-sediment interface in fish farm settling ponds

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 center dot g(-1) fresh sediment (550 individuals center dot m(-2)) and a third experimental line with 40 mg of tubificid worms center dot g(-1) fresh sediment (22 000 individuals center dot 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 center dot m(-2) had no significant influence on the fluxes of nutrients here considered. However, the influence of higher abundances of tubificids (22 000 individuals center dot 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 center dot m(-2)). Results obtained allowed us to estimate that fish farm settling ponds highly colonized by tubificid worms (22 000 individuals center dot m(-2)) may contribute to decrease phosphorus discharge (in terms of soluble phosphorus) in ca. 5 g of P center dot ton(-1) of fish produced.
Type de document :
Article dans une revue
Knowledge and Management of Aquatic Ecosystems, EDP sciences/ONEMA, 2014, pp.12P1-12P12
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https://hal-mines-nantes.archives-ouvertes.fr/hal-01206896
Contributeur : Nathalie Fontaine <>
Soumis le : mardi 29 septembre 2015 - 17:00:46
Dernière modification le : mercredi 11 juillet 2018 - 07:47:22

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  • HAL Id : hal-01206896, version 1

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J. Puigagut, Florent Chazarenc, Y. Comeau. Influence of tubificid worms on nutrient fluxes across water-sediment interface in fish farm settling ponds. Knowledge and Management of Aquatic Ecosystems, EDP sciences/ONEMA, 2014, pp.12P1-12P12. 〈hal-01206896〉

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