Landare eta arrainen ekoizpen jasangarrirako akuaponia sistema baten garapena Tenebrio molitor intsektuaren larbak erabiliz

Abstract

Aquaponics is the combination of aquaculture and hydroponic for the production of fish and plants, where thanks to a recirculation system, nitrifying bacteria convert the metabolic residues excribed by fish in nutrients irreplaceable for plants. Comparing with conventional aquaculture and hydroponic systems, the aquaponics system generates less environmental impact and uses much less water. However, the dependence of the aquaponics system on fish flour as fishmealis noteworthy. Thereby, in this work, the larvae of Tenebrio molitor (TM) insect have been included in different proportions (0, 25 and 50%) in an aquaponics system formed by rainbow trout (Oncorhynchus mykiss) and lettuce (Lactuca sativa), in order to determine the capacity of TM to replace fish flour. To this end, the physico-chemical properties of water (temperature, pH, electrical conductivity and concentration of nitrogen compounds) and the growth of rainbow trout and lettuce in aquaponics systems fed with different diets, have been evaluated. Regarding water parameters, although some parameters exceed the optimal level, they have not influenced both the cultivation of trout and lettuce, since the system in general has remained in balance. It should be noted that in the tanks where the TM larvae have not been included, the growth of lettuce has been greater, but when the TM larvae have increased by 25%, a significant improvement has been observed in the cultivation of trout, thus confirming the capacity of the TM larvae to replace the feed based on fish flour.