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Loading of nutrient from a land-based fish farm (Orbetello, Italy) at different times Porrello, S.; Lenzi, M.; Ferrari, G.; Persia, E.; Savelli, F.; Tomassetti, P. (2005). Loading of nutrient from a land-based fish farm (Orbetello, Italy) at different times. Aquacult. Int. 13(1-2): 97-108. https://dx.doi.org/10.1007/s10499-004-9027-1 In: Aquaculture International. Springer: London. ISSN 0967-6120; e-ISSN 1573-143X Ook verschenen in: Focardi, S.; Saroglia, M. (Ed.) (2005). Animal welfare, human health and interactions with the environment. Aquaculture International, 13(1-2). Springer: Dordrecht. 173 pp., meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 352048 [ aanvragen ]

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Trefwoorden

Aquatic organisms > Marine organisms > Fish > Marine fish Chemical compounds > Nitrogen compounds > Ammonia Chemical elements > Nonmetals > Atmospheric gases > Nitrogen Chemical elements > Nonmetals > Phosphorus Cultures > Fish culture MED, Italy, Tuscany, Orbetello Lagoon Nutrients (mineral) Wastes > Effluents > Aquaculture effluents Wastes > Organic wastes > Fish wastes Orbetello Lagoon [Marine Regions] Marien/Kust

Author keywords

ammonia; aquaculture wastewater; fish nutrient excretion; marinefish-farm; nitrogen; phosphorus

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Auteurs		Top
Porrello, S. Lenzi, M. Ferrari, G.	Persia, E. Savelli, F. Tomassetti, P.

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Abstract

A marine fish farm (production ~ 100 tonnes per year) located in the Orbetello lagoon area (Tuscany, Italy) was selected to study the waste water quality discharged. The aims of study were: a) quantify the nitrogen and phosphorus discharged from the fish farm at the beginning and the end of feeding time; b) verify nutrient trend during a daily cycle, and difference of release between nitrogen and phosphorus by reared biomass. From June 1999 to May 2000, water temperature, pH, salinity, dissolved oxygen and redox were hourly recorded in output wastewater station (E). Two water sampling strategies were adopted: monthly and daily. Monthly, in E, two field water samples at 8:00 a.m. (E8), at the beginning of feeding, and at 4:00 p.m. (E16), at the end of feeding, were collected. The dissolved and particulate nitrogen and phosphorus were analysed. With respect to total dissolved nitrogen (TDN), the total ammonia (NH3 + NH4+) concentration constituted more than 64%. With respect to total nitrogen and phosphorus, the particulated component represented, respectively, the 16% and 29-36%. A 24 h water sampling, at 4:00, 10:00, 12:00 a.m and at 4:00, 8:00, 12:00 p.m., was carried out. The results showed that TDN was excreted shortly after feeding, with a peak 4 h after the end of feeding. Most of the total dissolved phosphorus (TDP) was excreted after many hours, with a peak 8 h after the end of feeding.

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