The biofertilizer, made of crab shell waste, was used as nutrients source in aquaponics system. The present study was carried out to assess the growth of watercress. The effluents from catfish culture tank were flown through aquaponic systems. The height of water cress and the length of root was increased more than two centimetres in 10 days for all experiments. The height and root length of water cress was differentafter15days.

Biochemical oxygen demand (BOD5) was increased with biofertilizer due to organic matter from the biofertilizer. The results showed the potential of biofertilizer effects on the growth of watercress and improves water quality in aquaponic systems. So, the usage of biofertilizer in aquaponics systems is the guideline for green production. However, wastewater treatment process should be added into aquaponics system to enrich water quality control.

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Regards,
Lucie
Editorial Coordinator
Journal of Advances in Recycling & Waste Management