Implementation of IoT Technology for Monitoring and Stabilizing Water Quality in Catfish Ponds for the Karya Subur Fish Farmer Group

Abstract

Fish farmers in Kapuas Regency, Central Kalimantan, face serious challenges due to unstable pond water quality—specifically pH fluctuations and high ammonia levels—which have caused mass mortality among *Pangasius* catfish (*Pangasius* sp.). This community service initiative aims to assist the "Karya Subur" Fish Farmers Group by implementing Internet of Things (IoT) technology through the development of a device named "One Fish," capable of real-time water quality monitoring and automatic pond condition stabilization. The project was executed in three main stages: installing a monitoring system using pH and MQ-137 ammonia sensors connected to an Arduino ATmega328 microcontroller; implementing an automatic water stabilization system that dispenses a dolomite lime mixture or Effective Microorganisms-4 (EM-4) solution upon detecting abnormal conditions; and conducting training for group members, accompanied by the provision of an operational guidebook. The results demonstrate that the system successfully monitors pond water conditions in real-time and automatically responds to water instability, thereby reducing the risk of fish mortality and enhancing production efficiency for the partner group.