Comparison of nutrients release among some maricultured animals

A meta-analysis on the ecological effects of aquaculture on the water column: Dissolved nutrients

“…Differences in metabolic processes and biological features among these cultivated organisms combined with the type of management practices could explain these differences. Furthermore, dissolved waste release, for example, showed higher results in these experiments in fish than in bivalves, while shrimps were in the middle (Quian et al 2001). This observation supports the direction of size effect (see Fig.…”

“…Ammonium was the nitrogen form that more often deviated under cultivation conditions, followed by nitrates and nitrites and lastly by phosphorus. The differing chemical behaviour and the origin of each nutrient could explain these results (Valiela 1984, Hargreaves 1998, Quian et al 2001). For example, as ammonium is mainly produced by excretion of organisms (both fish and shrimps) and in shallow waters (shallow basins, ponds, estuaries) from sediment-flux derived from the mineralisation of organic matter (e.g.…”

Serial Particle Size Fractionation and Water Quality in a Recirculating Aquaculture System for Eel

“…As a result, suspended particle concentrations in RASs often exceed the recommended limit of 15 mg L -1 (Reinemann, 1987;Timmons et al, 1987). There is a significant amount of water quality analysis data for aquaculture effluents (Foy and Rosell, 1991b;Eikebrokk et al, 1995;Qian et al, 2001); however, little work has been conducted to quantify nutrients according to particle size with the aim of using the results to improve treatment efficiency (Bergheim and Forsberg, 1993;Bergheim et al, 1993a).…”

Response of lake water quality to wastewater inputs from land-based fish farm located on Yuvarlakçay Creek in Köyceğiz–Dalyan Specially Protected Area, Turkey

“…Enell (1995) reported that fish farms are a major source of nutrients and that the magnitude of impact is mainly determined by the quantity and compositions of fish feeds and feed compositions. Qian and Wu (2001) stated that minced fish had higher immediate pollution levels than whole fishes and mollusks. In general, 85% of phosphorus, 80-88% of carbon and 52-95% of nitrogen input into a marine fish culture system as feed may be lost into the environment through uneaten feed, fish excretion, and respiration.…”

“…Eutrophication or algal blooms often occur in such nutrient-enriched environments. Furthermore, high bacterial content in aquaculture waters may significantly deteriorate water quality by lowering the dissolved oxygen and pH (Qian and Wu 2001).…”