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Kuala Indah Village in Sei Suka, Batubara, North Sumatra, is a coastal village whose economy relies on fisheries and aquaculture. The community is predominantly Muslim and also practices small-scale agriculture and animal husbandry. The Community Service Program (KKN) provides a platform for students to apply academic theory in real-world contexts, while also encouraging active community involvement. KKN students implement various programs, such as stunting prevention, religious moderation, skills training for poverty alleviation, and education for children and adolescents. They also play a role in increasing community participation through cultural activities and supporting local businesses by strengthening digital visibility. These initiatives support the creation of inclusive villages, providing equal access and opportunities regardless of gender, religion, or socioeconomic status. This collaborative approach reinforces the value of mutual cooperation and enriches social and educational life in the village. Through KKN, universities demonstrate their tangible contribution to village development. The success of this program underscores the importance of social inclusion and collective work in promoting sustainable development in rural areas like Kuala Indah.  

Penarukan Village, located in Tabanan Regency, is predominantly inhabited by communities engaged in freshwater fish farming, particularly Nile tilapia (Oreochromis niloticus). The high demand for Nile tilapia in Tabanan and surrounding areas poses a challenge for farmers to manage the growth and development of the fish to ensure optimal quality. During the cultivation process, various issues arise that require effective solutions to support the sustainability of this sector. One of the main problems faced by fish farmers is related to the quality of biofloc pond water, which is still monitored using conventional methods. Poor water quality that does not meet the optimal living standards for Nile tilapia can hinder growth, reduce fish health, and negatively impact production yield. Manual monitoring methods are also prone to inaccuracy and complicate the data analysis process needed for effective decision-making.To address this issue, a technology-based solution has been proposed in the form of a real-time monitoring system using the “SI-NILA” mobile application integrated with a microcontroller-based Internet of Things (IoT) system. This system allows for continuous monitoring of pond water quality and automated pH control to maintain suitable conditions for fish growth. This innovation is expected to improve efficiency and effectiveness in fish farming practices, minimize the risk of crop failure, and promote the digital transformation of aquaculture in Penarukan Village, contributing to the sustainable development of the freshwater aquaculture sector.

Aquaponics is a combined system of fish farming techniques and hydroponic plant cultivation. Fish manure and feed residues are very dependent on the supply of nutrients in the aquaponic system of red tilapia (Oreochromis niloticus) aquaculture. The level of production of vegetable crops in a certain area is also influenced by the total nutrient input ratio of feed to domestic fish per day. The aquaponic system utilizes optimum water supply for each commodity by utilizing a recirculation system. The type of fish used is fish that live in freshwater, a type of tilapia. Fish farming includes the maintenance of fish, which pays attention to the growth and development of fish. Hydroponics itself is a way of farming without using soil as a medium but using water which contains controlled nutrients containing the essential elements needed for plant growth. The location of this research was conducted in Losari Village, Kec. Gondang, Kab. sleepy. It aims to increase the demand for vegetables, limited land and space, efficiency in land use, and decoration. In addition, this cultivation system allows for increased production of cultivated products with limited land and water sources, and creates its own beauty. (9 pt).  

Technological developments, especially in agriculture, must develop because of the increase in population and climate change requires us to look for innovative sustainable solutions in agriculture because agriculture is a very basic field in human life. Therefore, our group which is a group of students who carry out service in Penjaringansari village made an agricultural innovation with an appropriate technology aquaponics system in catfish cultivation as one of its work programs.This service is carried out by the method of active participation approach of partner groups that is tailored to the needs of the community by our group. The initial stage carried out is catfish cultivation then combines with a hydroponic system in plants to form an aquaponics system. The treatment process is carried out by checking thoroughly regularly.This service program is expected to provide benefits for the people of Penjaringansari Village and can be implemented properly after the completion of KKN. This program aims to improve food security and community independence through limited land use in the yard.  

Tuban Village is one of the villages in Badung Regency that has the potential of coastal areas that are utilized by the community for various purposes. The high utilization of coastal areas has led to the conversion of mangrove land for various purposes, resulting in damage in the form of abrasion in several places, pollution due to industrial activities, households and aquaculture activities. Therefore, mangrove forest rehabilitation program is considered as one of the important recommendations in order to restore the condition of mangrove ecosystem in this region. The training consisted of a group of Nature Lovers Students (Mapala) which included the provision of training and socialization in the field on the introduction of mangrove tree species and characteristics and mangrove tree planting techniques in theory and application of the theory that has been obtained in the form of collecting and processing mangrove trees to be used as seeds and planting practices. The results of the training showed that all participants understood the material presented. This can be seen from the way participants apply the theory obtained by direct practice in the field.

The Community Service Lecture work program in the form of hydroponic kale and catfish cultivation applications with an aquaponic system was carried out in Dawuhan Hamlet, Kayugiyang Village, Wonosobo Regency. The purpose of this KPM work program is to utilize the yard of the house so that it has productive value and educate the community with environmentally friendly cultivation systems. The stages of implementing this work program include the stages of field surveys and partner conditions, seeding kale seedlings, installing Aquaponics installation ponds, and mentoring activities. The technology used is the aquaponic system cultivation, which utilizes catfish manure as natural fertilizer for water spinach plants placed on it. From the results of the implementation of the KPM work program, it resulted in 1 (one) unit of aquaponic cultivation ponds, increasing public knowledge, especially for teenagers who are KPM partners.