Optimising the operation of a small-scale aquaponic system for yellow catfish (Clarias macrocephalus) using a computer-based model

Abstract

This study aimed to optimise the operating process of a media-filled aquaponic system for raising bighead catfish (Clarias macrocephalus) based on a computer model. The computer-based model was built using the agent-based modelling (ABM) approach and calibrated with experimental datasets. The optimised results from the model runs suggested operating processes for six fish tank volumes (500, 1000, 1500, 2000, 2500, and 3000 litres), where fish density can reach a maximum of 150 kg/m³ of water. The optimal fingerling size is 20 g/fish, and the vegetable growing area is balanced according to fish weight (5-6 kg of fish/m²). Water circulation should be adjusted according to the fish tank volume, ranging from 16 to 24 times per day. To maximise the benefits, which are calculated from the balance between fish weight gain and feed consumption, it is suggested to harvest the fish after 151 days of raising in the aquaponic system. When applying these operating processes, it is necessary to regularly monitor water quality and adjust pumping and wastewater discharge as needed.