FN Archimer Export Format PT J TI A model for predicting the quantities of dissolved inorganic nitrogen released in effluents from a sea bass (Dicentrarchus labrax) recirculating water system BT AF PAGAND, Pascal BLANCHETON, Jean-Paul CASELLAS, Claude AS 1:;2:;3:; FF 1:PDG-DRV-RA-LPALAVAS;2:PDG-DRV-RA-LPALAVAS;3:; C1 Stn IFREMER, Chem Maguelone, F-34250 Palavas Flots, France. Fac Pharm Montpellier, Dept Sci Environm & Sante Publ, CNRS, UMR 5556, F-34060 Montpellier, France. C2 IFREMER, FRANCE FAC PHARM MONTPELLIER, FRANCE SI PALAVAS SE PDG-DRV-RA-LPALAVAS IN WOS Ifremer jusqu'en 2018 IF 0.593 TC 14 UR https://archimer.ifremer.fr/doc/2000/publication-514.pdf LA English DT Article DE ;Recirculating water system;Nitrogen production;Model;Fish farm effluent;European sea bass;Dissolved inorganic nitrogen AB Fish excretions and the transformation of nitrogen by bacteria in the nitrifying biofilter are two of the main sources of dissolved inorganic nitrogen (DIN) in fish farms that use recirculating water systems. In this study, the DIN concentration in an experimental Dicentrarchus labrax aquaculture system was calculated using empirical sub-models for fish growth, ingested food and water replacement. The specific growth rate (SGR) (% day(-1)) and the daily feeding rate (DFR) (% day(-1)) both depend on the average weight, W (g), of the fish: Y = aW(b), where Y may be SGR or DFR, and a and b are empirical constants. The DIN discharge rate, Gamma(N) (% of ingested nitrogen), in the experimental aquaculture system was expressed as a function of increasing replacement water flow rate, theta (day(-1)): DIN = c theta(d), where c and d are empirical constants. Only three variables (the number of fish, the initial fish weight and the replacement water flow rate) are required to run the general model, which was tested over a period of 12 months (June 1997-June 1998). This model, calibrated and validated on independent sets of data obtained from the same experimental system, accurately predicted the concentration of DIN in the effluent (r(2) = 0.92). PY 2000 PD MAY SO Aquacultural Engineering SN 0144-8609 PU Elsevier VL 22 IS 1-2 UT 000086992500010 BP 137 EP 153 DI 10.1016/S0144-8609(00)00037-6 ID 514 ER EF