Titre du document / Document title

The effects of common carp bioturbation on fishpond bottom soil

Auteur(s) / Author(s)

RITVO Gad ⁽¹⁾ ; KOCHBA Malka ⁽¹⁾ ; AVNIMELECH Yoram ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Faculty of Civil and Environmental Engineering Technion, Israel Inst. of Technology, Haifa 3200, ISRAEL

Résumé / Abstract

Bioturbation activity generated by fish has the potential to improve bottom soil quality by increasing oxygen supply to a greater depth in aquaculture ponds bottoms. This study was designed to assess the common carp (Cyprinus carpio L) potential to improve conditions in pond bottom soils. Enclosures (3 ×2 m) constructed within a tilapia production pond were stocked with zero, two or seven carp each. Treatments were triplicated (four replicates used for the control treatment). Carp were not fed by a prepared diet during the study. Fluorescent stained quartz particles were added to the bottom soils (as a bioturbation tracer) in the enclosures. Bottom soil cores were taken from the enclosures sectioned to 0-1, 1-2, 2-3 and 3-5 cm layers. Total dissolved sulfide (TDS), soluble Mn, easily oxidized matter (EOM), and exchangeable NH₄-N were determined. Concentrations of all the above measured constituents, 45 days after stocking, along the bottom soil profile in the enclosures that contained fish, were lower than in the enclosures without fish. Bulk density of surface soil in enclosures containing carp was significantly greater than for the control. Tracer analysis results indicated that more particles were displaced down to 3-cm depth in the enclosures with carp as compared to control, suggesting that the carp stirring activity was effective down to approximately 3 cm. Pond bottom soil perturbation increases oxygen transfer to the soil, decrease the concentration of toxic reduced compounds and enable more efficient food web recycling and nutrient release.

Revue / Journal Title

Aquaculture   ISSN 0044-8486   CODEN AQCLAL 

Source / Source

2004, vol. 242, n^o1-4, pp. 345-356 [12 page(s) (article)] (23 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1972) (Revue)

Mots-clés anglais / English Keywords

Freshwater environment ; Aquaculture ; Organic matter ; Oxygen ; Sediments ; Pond ; Soils ; Bioturbation ;

Mots-clés français / French Keywords

Milieu eau douce ; Aquiculture ; Matière organique ; Oxygène ; Sédiment ; Etang ; Sol ; Bioturbation ;

Mots-clés espagnols / Spanish Keywords

Medio agua dulce ; Acuacultura ; Materia orgánica ; Oxígeno ; Sedimento ; Estanque ; Suelo ; Bioturbación ;

Mots-clés d'auteur / Author Keywords

Pond soil ; Sediment ; Bioturbation ; Oxygen ; Organic matter ; Carp ;

Localisation / Location

INIST-CNRS, Cote INIST : 15964, 35400012606571.0260