Nitrogenous and phosphorous waste production in a flow-through land-based farm of European seabass ()

Abstract

A study on nitrogenous and phosphorous waste production in European seabass (Dicentrarchus labrax) was carried out in a flow-through land-based farm. The main objectives were (i) to calculate nitrogenous (N) and phosphorous (P) waste production (particulate and dissolved) from in situ measurements for different rearing ponds with specific fish biomasses, fish sizes and flow rates, (ii) to establish nitrogenous and phosphorous waste production budgets, ratios and equations, and (iii) to compare, for the whole farm, in situ measurements to estimate N and P waste production from waste equations. Waste production was manifest by an increase in concentrations of total ammonia nitrogen, total Kjeldhal nitrogen, particulate nitrogen, dissolved phosphorus and total phosphorus concentrations in the outlet water compared to the inlet water for both batches and whole farm. However, no production of nitrite or nitrate was observed. In our budgets, the N and P amounts from biomass gains and wastes were explained by the N and P derived from feed over the range 83.9-105.2 % and 66.5-104.6 % respectively, depending on the fish batch. Values were respectively 103.4 and 87.5 % for the same calculations in the farm. When the whole-farm waste production was calculated from previous equations derived from batches, and then compared with the measured data, the percentages of recovery (estimated by the ratio predicted data/measured data) were 88 and 94 % for total-N and total-P respectively. 0 Ifremer/Elsevier, Paris Fish farm waste I excretion I nitrogenous budget I phosphorous budget ! Dicentrarchus labrax R&urn6-Quantification des rejets azot&s et phosphor&s d'une ferme d'klevage en bassins de bars Dicentrarchus labrax. L'Ctude de la production des dkchets (azote et phosphore) d'une ferme de production de bars (Dicentrarchus labrax) est rkaliske. Cette Ctude k pour objectif (i) de mesurer in situ la production des dkchets azotCs et phosphor& sous forme particulaire et soluble, pour diffkrents bassins d'klevage prksentant des caractkistiques variables en terme de biomasse de Poisson, de taille des poissons, de d&bit de l'eau de renouvellement, (ii) d'ktablir des Cquations de production de dkhets B park des donnees pr&Cdemment acquises, (iii) de comparer, pour l'ensemble des rejets au niveau de la ferme, les rksultats obtenus par des mesures in situ, d'une part, et B l'aide des Cquations, d'autre part. La production de dtchets se traduit par une augmentation des concentrations de l'azote particulaire, de l'azote ammoniacal, de I'azote organique dissous, ainsi que du phosphore particulaire et dissous. Aucune augmentation des nitrates et nitrites n'est observke. L'Ctablissement des budgets d'azote et de phosphore permettent de rendre compte, selon les bassins, du devenir de 88,2 B 105,2 % de I'azote et de 66,2 k 104,6 % du phosphore introduits dans les bassins sous forme de nourriture en granulks. L'Ctude des budgets rCalisCe par les deux mkthodes (mesures in situ et utilisation des kquations) montre que les budgets Ctablis g l'aide des...

Modelling biogeochemical fluxes across a Mediterranean fish cage farm

“…This result was achieved on the basis of a model parameterization, which, for 18 over 19 parameters, was carried out based on experimental studies of the physiology and nutrition of this species. N and P contents in fish tissues, which were calculated by closing the budgets, compare well with those reported by Lemarié et al (1998), with respect to D. labrax, 1.4% N and 0.6% P on a wet weight basis. The fact that our results were consistent with these numbers can be seen as an indirect indication that the model is likely to simulate fish metabolism with accuracy.…”

Sustainable farming practices of the Chinese mitten crab (Eriocheir sinensis) around Hongze Lake, lower Yangtze River Basin, China

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Effects of wild fishes on waste exportation from a Mediterranean fish farm

“…A range of environmental effects has been related to net-pen aquaculture, particularly in regard to energy and nutrient fluxes, pelagic and benthic biomass and community structure, fish stocks, sedimentation rates, oxygen depletion and shifts in the algal community. Many of these are directly related to nutrient pollution, and several studies have shown that 70 to 80% of nutrients added in aquaculture are lost to the environment in the form of metabolic waste, faeces and uneaten food fragments (Kaushik 1998, Lemarié et al 1998, Lupatsch & Kissil 1998. The deposition of particulate matter from aquaculture net-pens has been identified as the main cause of negative environmental impacts (Gowen et al 1991, Pillay 1992, Read & Fernandes 2003.…”