The advancement of eco-friendly aquaculture technology utilizing mudfish (saebang-i) is gaining momentum. Recently, Jeonbuk Province announced that it has jointly filed three patents for eco-friendly aquaculture technology using mudfish with the National Institute of Ecology. The patents filed this time include: △ a method for cultivating and producing green algae as feed organisms for mudfish, △ a method for raising mudfish using green algae as feed organisms, and △ a method for improving water quality and restoring aquatic plants in eutrophic water bodies using mudfish. The core of this technology lies in directly cultivating harmless green algae and using them as feed for mudfish. Since commercial compound feed is not used, feed costs can be significantly reduced, and due to the characteristic of mudfish eating green algae, it leads to a reduction in green algae and improvement in water quality.