Effect of stocking density of fish on water quality and growth performance of European Carp and leafy vegetables in a low-tech aquaponic system

Aquaponics (AP) is a semi-closed system of food production that combines aquaculture and hydroponics and represents a new agricultural system integrating producers and consumers. The aim of this study was to test the effect of stocking densities (APL, 2.5 kg m-3; APH, 4.6 kg m-3) on water quality, growth performance of the European Carp (Cyprinus carpio L.), and yield of leafy vegetables (catalogna, lettuce, and Swiss Chard) in a low-technology AP pilot system compared to a hydroponic cultivation. The AP daily consumption of water due to evapotranspiration was not different among treatments with an average value of 8.2 L d-1, equal to 1.37% of the total water content of the system. Dissolved oxygen was significantly (p < 0.05) different among treatments with the lowest median value recorded with the highest stocking density of fish (5.6 mg L-1) and the highest median value in the hydroponic control (8.7 mg L-1). Marketable yield of the vegetables was significantly different among treatments with the highest production in the hydroponic control for catalogna (1.2 kg m-2) and in the APL treatment for Swiss Chard (5.3 kg m-2). The yield of lettuce did not differ significantly between hydroponic control and APL system (4.0 kg m-2 on average). The lowest production of vegetables was obtained in the APH system. The final weight (515 g vs. 413 g for APL and APH, respectively), specific growth rate (0.79% d-1 vs. 0.68% d-1), and feed conversion (1.55 vs. 1.86) of European Carp decreased when stocking density increased, whereas total yield of biomass was higher in the APH system (4.45 kg m-3 vs. 6.88 kg m-3). A low mortality (3% on average) was observed in both AP treatments. Overall, the results showed that a low initial stocking density at 2.5 kg m-3 improved the production of European Carp and of leafy vegetables by maintaining a better water quality in the tested AP system.

[1]  P. García-Encina,et al.  Influence of pH over nitrifying biofilm activity in submerged biofilters , 1997 .

[2]  F. J. Ward,et al.  The effect of stocking density on yield, growth and mortality of African catfish (Clarias gariepinus Burchell 1822) cultured in cages , 1997 .

[3]  Hao Ying,et al.  Denitrification in aquaculture systems: an example of a fuzzy logic control problem , 2000 .

[4]  Dorothea C. Smith,et al.  The effects of composts produced by a simple composting procedure on the yields of Swiss chard (Beta vulgaris L. var. flavescens) and common bean (Phaseolus vulgaris L. var. nanus) , 2001 .

[5]  T. Ellis,et al.  The relationships between stocking density and welfare in farmed rainbow trout , 2002 .

[6]  E. Simonne,et al.  Reconciling water quality parameters impacting nitrification in aquaponics: the pH levels , 2004 .

[7]  D. S. Bailey,et al.  Aquaponic production of tilapia and basil: comparing a batch and staggered cropping system , 2004 .

[8]  B. B. Jana,et al.  Density dependent ambient ammonium as the key factor for optimization of stocking density of common carp in small holding tanks , 2006 .

[9]  Wilson A. Lennard,et al.  A Comparison of Three Different Hydroponic Sub-systems (gravel bed, floating and nutrient film technique) in an Aquaponic Test System , 2006, Aquaculture International.

[10]  T. Losordo,et al.  Recirculating Aquaculture Tank Production Systems : Aquaponics — Integrating Fish and Plant Culture , 2006 .

[11]  Paul J. Ashley.  Fish welfare: Current issues in aquaculture , 2007 .

[12]  Y. Rouphael,et al.  Nutrient solution concentration and growing season affect yield and quality of Lactuca sativa L. var. acephala in floating raft culture. , 2009 .

[13]  G. Breuil,et al.  The effect of density on sea bass (Dicentrarchus labrax) performance in a tank-based recirculating system , 2009 .

[14]  N. Karakatsouli,et al.  Effects of light spectrum, rearing density and light intensity on growth performance of scaled and mirror common carp Cyprinus carpio reared under recirculating system conditions , 2010 .

[15]  Dapeng Li,et al.  Effect of stocking density on growth and serum concentrations of thyroid hormones and cortisol in Amur sturgeon, Acipenser schrenckii , 2011, Fish Physiology and Biochemistry.

[16]  E. Simonne,et al.  Opportunities and Challenges to Sustainability in Aquaponic Systems , 2011 .

[17]  J. Britton,et al.  Effects of temperature on the foraging and growth rate of juvenile common carp, Cyprinus carpio , 2012 .

[18]  James E. Rakocy,et al.  Aquaponics—Integrating Fish and Plant Culture , 2012 .

[19]  E. Rea,et al.  Aquaponics vs. hydroponics: production and quality of lettuce crop. , 2012 .

[20]  C. Nicoletto,et al.  Effect of grafting and ripening conditions on some qualitative traits of 'Cuore di bue' tomato fruits. , 2013, Journal of the science of food and agriculture.

[21]  G. Rathore,et al.  Optimizing Koi Carp, Cyprinus carpio var. Koi (Linnaeus, 1758), Stocking Density and Nutrient Recycling With Spinach in an Aquaponic System , 2014 .

[22]  U. Knaus,et al.  Significant factors affecting the economic sustainability of closed aquaponic systems. Part II: fish and plant growth , 2014 .

[23]  G. Rathore,et al.  Effect of water flow rates on growth of Cyprinus carpio var. koi (Cyprinus carpio L., 1758) and spinach plant in aquaponic system , 2014, Aquaculture International.

[24]  Simon Goddek,et al.  Challenges of Sustainable and Commercial Aquaponics , 2015 .

[25]  C. Stedmon,et al.  Characterising organic matter in recirculating aquaculture systems with fluorescence EEM spectroscopy. , 2015, Water research.

[26]  S. Lam,et al.  Biological nutrient removal by recirculating aquaponic system: Optimization of the dimension ratio between the hydroponic & rearing tank components , 2015 .

[27]  S. Alderman.  The Practicality and Sustainability of Aquaponic Agriculture Versus Traditional Agriculture with Emphasis on Application In the Middle East , 2015 .

[28]  B. König,et al.  On the sustainability of aquaponics , 2016 .

[29]  R. Tang,et al.  Effect of Stocking Density on Growth, Physiological Responses, and Body Composition of Juvenile Blunt Snout Bream, Megalobrama amblycephala , 2016 .

[30]  W. Nik,et al.  Balancing of nutrient uptake by water spinach (Ipomoea aquatica) and mustard green (Brassica juncea) with nutrient production by African catfish (Clarias gariepinus) in scaling aquaponic recirculation system. , 2016 .

[31]  Maria José Palma Lampreia dos Santos,et al.  Smart cities and urban areas—Aquaponics as innovative urban agriculture , 2016 .

[32]  Simon Goddek,et al.  Lettuce (Lactuca sativa L. var. Sucrine) growth performance in complemented aquaponic solution outperforms hydroponics , 2016 .

[33]  J. Vollertsen,et al.  Sulfide Precipitation in Wastewater at Short Timescales , 2017 .

[34]  H. Y. Yildiz,et al.  Fish Welfare in Aquaponic Systems : Its Relation to Water Quality with an Emphasis on Feed and Faeces : A Review , 2017 .

[35]  H. Palm,et al.  Stress and Welfare of African Catfish (Clarias gariepinus Burchell, 1822) in a Coupled Aquaponic System , 2017 .

[36]  M. Borin,et al.  Hydroponic systems and water management in aquaponics: a review , 2017 .

[37]  T. L. Hachmann,et al.  Características produtivas da chicória da catalogna, cultivada em diferentes espaçamentos sob telas de sombreamento , 2017 .

[38]  U. Knaus,et al.  Effects of the fish species choice on vegetables in aquaponics under spring-summer conditions in northern Germany (Mecklenburg Western Pomerania) , 2017 .

[39]  B. König,et al.  Analysis of aquaponics as an emerging technological innovation system , 2018 .

[40]  Guozhi Luo,et al.  Effects of Stocking Density on Growth, Body Composition, Digestive Enzyme Levels and Blood Biochemical Parameters of Anguilla marmorata in a Recirculating Aquaculture System , 2018 .

[41]  Simon Goddek,et al.  Towards commercial aquaponics: a review of systems, designs, scales and nomenclature , 2018, Aquaculture International.

[42]  M. Hossain,et al.  Effect of stocking density on growth performance of monosex tilapia (Oreochromis niloticus) with Indian spinach (Basella alba) in a recirculating aquaponic system , 2018 .

[43]  Xi Zhang,et al.  High stocking density alters growth performance, blood biochemistry, intestinal histology, and muscle quality of channel catfish Ictalurus punctatus , 2018, Aquaculture.

[44]  R. Junge,et al.  Extension of aquaponic water use for NFT baby-leaf production : mizuna and rocket salad , 2018 .