Utilization of effluent fish farms in tomato cultivation

Role of stocking density of tilapia (Oreochromis aureus) on fish growth, water quality and tomato (Solanum lycopersicum) plant biomass in the aquaponic system

“…This was also reported by Graber and Junge [19] to explain a poor vegetable quality in aquaponics. In the present study, total plant biomass was low when compared with the previous studies on tomato plant in the aquaponics [20,21]. Total biomass of the plant showed differences depending on the fish stocking ratio and total plant biomass increased with decreasing the fish density.…”

Hydroponic systems and water management in aquaponics: a review

“…Most of the papers examined suggest that from 2.3 to 18 fish tank water recirculations per day (Table 1) should be adopted to maximise system performance in terms of fish growth, plant growth and nutrients removal, but in many cases different water recirculation rates correspond to the same water flow (Endut et al, 2009(Endut et al, , 2010Nuwansi et al, 2016). Considering the above reported literature, the water flow speed through the roots bringing fresh molecules is of greatest importance, with better performance between 0.8 L min -1 and 8.0 L min -1 (Table 1) Khater et al, 20150.8-2.4-4 16.5-49.4-82.3 Nuwansi et al, 2016 12-24- 48 densities, different hydroponic systems and plant species. Therefore, more studies are needed to confirm this assumption.…”

“…A question arises as to whether it is more important the water recirculation frequency in the fish tanks or the water flow speed through the roots bringing fresh molecules. The comparison of different water flows in root zone and hydraulic rates of the system water are summarised on the Table 1. Very low constant flow rates were studied by Khater et al (2015) (Table 1) in AP system consisting of five fish tanks (each 40 m 3 ) and three gullies (each 27 m 2 ) covered with foam rafts to support tomato plants. As flow rates increased, the authors observed an increase in plant nutrient uptake for N (+87.8%), P (+58.3%), K (+73.9%), Ca (+89.1%) and Mg (+74.3%) coupled with increase in root and shoot length and biomass, fruit yield per plant and also water use efficiency (from 5.54 to 7.16 kg m -3 as flow rate increased from 0.067 to 0.1 L min -1 ).…”

Food Sovereignty for Food Security, Aquaponics System as a Potential Method: A Review

“…The environmental concerns about emission of nitrous oxides are mainly related to the effect on global warming and the role of nitrous oxides in ozone destruction [38]. The destruction of O 3 is catalyzed by NO, halogens, hydroxyl, and hydrogen [22]. A possible source of NO is from N 2 O, the product of denitrification, which can diffuse into the upper atmosphere and lead to atmospheric holes, hence causing problems for plants and animal life well-being from excessive exposure to ultraviolet fish in the world [41,46].…”

“…This opens a new niche for sustainable food production, which is necessary and important for South Africa to optimize it food availability. In order to make good use of aquacultural effluent and wastes, aquaponic systems have been designed with dual potential effect, (a) assist mitigate aquacultural fish waste product that has negative potential to the environment, and (b) to use nutrient-rich aquacultural effluent to produce healthy food [22,23].…”