Water quality in an aquaponics system interconnected with a biofilter

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María L. Adriano-Anaya
Kenia Y. García-López
Maciel Reyes-Flores
Miguel Salvador-Adriano
Miguel Salvador Figueroa

Keywords

biofilter, aquaculture, mineralization, ammonia.

Resumen

Objective: To determine the water quality of an aquaponics system interconnected by a biofilter, using sponge gourd (Luffa cylindrica) as an inert support.


Design/Methodology/Approach: The organisms used in the aquaponics system were juvenile tilapia (Oreochromis niloticus) and wormseed (Chenopodium ambrosioides). The following physicochemical parameters of the water were analyzed: temperature, pH, dissolved oxygen, electrical conductivity, NH4+, NO2-, and NO3-. Data generated in this work were subjected to an analysis of variance (ANOVA) and to the comparison of means (Tukey’s test, p<0.05).


Results: Recirculating tank water through the biofilter and plants reduced NH4+ and NO3- by 31.6% and 18.5%, respectively. The total ammonia nitrogen in the tank did not exceed 0.022 mg L-1. The fish survival rate was 100% and 725.8 g of wormseed were harvested. The wormseed did not show symptoms of mineral deficiency.


Study Limitations/Implications: Aquaponics production is still limited to small surfaces, as a consequence of the costs involved in its handling.


Findings/Conclusions: Water quality parameters of the tilapia (Oreochromis niloticus)-wormseed (Chenopodium ambrosioides) aquaponics system —interconnected through a biofilter with Luffa cylindrica— fulfilled the recommendations for such system.

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