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Freshwater fish diseases significantly affect aquaculture productivity and economic sustainability, while accurate visual classification remains challenging due to interclass similarity and image variability. This study presents a comparative evaluation of three deep learning architectures—DenseNet201, ResNet50, and EfficientNetV2-S—using a stepwise optimization strategy combined with Gradient-weighted Class Activation Mapping (Grad-CAM) for freshwater fish disease classification. Models were trained through three phases: baseline, optimized, and fine-tuned. Performance was evaluated using accuracy, precision, recall, F1 score, Matthews correlation coefficient (MCC), Cohen’s kappa, and per-class ROC–AUC. Results show consistent performance improvement across all architectures, with EfficientNetV2-S achieving the highest accuracy (97.14%), followed by ResNet50 (96.11%) and DenseNet201 (94.40%). High ROC–AUC values (>0.98) indicate strong discriminative capability. Grad-CAM analysis confirms that all optimized models focus on biologically relevant lesion regions, enhancing model transparency and reliability.

The white shrimp (Litopenaeus vannamei) is one of the popular marine shrimp species in aquaculture due to its adaptability to various environmental conditions, including a wide range of salinity, and its omnivorous feeding behavior. This study aims to determine the effect of different combinations of stocking density and salinity on the growth rate and post larval survival of vaname shrimp (Litopenaeus vannamei). The research was conducted using factorial planning based on two factors namely stocking density (3, 6, and 9ekor/L) and salinity (15 ppt and 25 ppt). Parameters measured included daily growth rate, absolute weight, survival rate, feed utilization efficiency, and feed conversion ratio (FCR). Water quality observations were also made during the study period including temperature, pH, dissolved oxygen, salinity, and total ammonia. The results showed that the combination of stocking density of 3 fish/L with salinity of 25 ppt gave the best results with a daily growth rate of 0,00664 gram and a survival rate of 86%. This treatment also produced the best feed utilization efficiency of 0.87 and the best FCR value of 1.27, indicating the most efficient use of feed. Water quality parameters during the study were within the appropriate range to support the growth of vanamei shrimp.

Community service activities in traditional fish ponds on Tibi Island, Tarakan, aim to increase the productivity of fish and shrimp farming using a simple yet effective approach. The methods applied include manual pond maintenance, such as spreading molasses solution (EM-4) to improve water quality, removing pests such as snails and oysters, and routine net maintenance and water drainage. Feed management is carried out every three days to maintain the nutritional balance of fish and shrimp. Although without the use of sophisticated technology, the success of cultivation depends heavily on the experience and thoroughness of the farmers in managing the pond environment. Overall, this activity demonstrates that a simple and structured approach can support sustainable cultivation, increase productivity, and strengthen collaboration between the implementation team and the pond owners. It is hoped that this method can serve as a useful example for other traditional fish farmers in increasing aquaculture yields and supporting more efficient and environmentally friendly farming practices.

Intensive exploitation of fish for caviar production currently threatens the extinction of sturgeon, one of the ancient fish species. Sturgeon egg harvesting is often carried out in inhumane ways, such as dissecting and killing parent fish, causing the natural sturgeon population to decline. The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) regulates the international trade of sturgeon and caviar, but weak law enforcement, high market demand, and widespread illegal trade all exacerbate the conservation status of this species. Conversely, caviar aquaculture, often considered an alternative, raises new bioethical issues, including long-term stress on fish, disease spread, decline in animal health, and the risk of hybridization that could threaten the genetic integrity of sturgeon populations. From a bioethical and environmental ethics perspective, it is difficult to justify the consumption of caviar as a luxury commodity at the expense of ecosystem sustainability and animal welfare. Therefore, sturgeon conservation requires a comprehensive approach that includes reducing consumer demand, improving legislation and enforcement, and preserving and restoring sturgeon's natural habitats.

Sea cucumbers (Holothuroidea) are marine organisms of high ecological and economic value, yet their populations in many tropical regions have declined due to exploitation pressures. This study aimed to analyze the density and distribution patterns of sea cucumbers in the coastal waters of Tuhaha, Saparua Island, Central Maluku Regency. A quantitative descriptive survey was conducted using 1 × 1 m quadrat transects along eight transect lines perpendicular to the shoreline. Density was calculated based on the number of individuals per unit area, while distribution patterns were determined using Morisita’s index. Four species of sea cucumbers were identified, namely Holothuria scabra, Holothuria atra, Bohadschia vitiensis, and Bohadschia marmorata, with a total of 33 individuals and an overall density of 0.19 ind/m². Species H. scabra exhibited the highest density (0.11 ind/m²), whereas H. atra and B. vitiensis had the lowest (0.01 ind/m²). The population distribution was aggregated (Id = 6.11), indicating a strong association with specific microhabitats, particularly muddy-sand substrates. Environmental parameters (temperature 30°C, salinity 30 ‰, pH 6.90) remained within the optimal tolerance range for sea cucumbers. These findings indicate that Tuhaha waters continue to support Holothuroidea populations; however, the aggregated distribution pattern reflects vulnerability to overexploitation. Therefore, ecosystem-based management through habitat conservation, catch restrictions, and the integration of aquaculture and restocking is essential to ensure the sustainability of sea cucumber resources in Central Maluku.

This study aims to determine the ideal stocking density of catfish using the triple integral method. This mathematical method is applied to accurately calculate the volume of the cultivation pond and analyze the stocking amount and biomass projection at three different density levels, namely 50, 75, and 100 fish/m³. The calculation of the volume of the pond measuring 27 m x 11 m x 1.5 m produces a value of 445.5 m³. Based on the integral calculation, the optimal stocking amount is 22,275 fish, 33,413 fish, and 44,550 fish for each density, with the final biomass projection reaching 300.7 kg, 451.1 kg, and 600.4 kg, respectively. The analysis shows that the density of 100 fish/m³ produces the highest biomass, but its application must consider technical factors such as water quality, oxygen availability, and food competition. This method provides a solid and practical mathematical foundation for more efficient, scalable, and sustainable aquaculture planning.

This study aims to analyze inventory control of catfish seeds at ABC Company by comparing the conventional inventory method represented by the Economic Order Quantity (EOQ) approach and the Just In Time (JIT) system in order to improve cost efficiency. This research employed a descriptive quantitative approach using a case study design. Data were collected through direct observation, semi-structured interviews with company management, and documentation of inventory and cost records for the 2024 operational period. The analysis method involved calculating optimal order quantities, ordering frequency, delivery frequency, and total inventory costs using EOQ and JIT formulas, followed by a comparative cost efficiency analysis. The results show that the conventional method resulted in a total inventory cost of Rp 75,050,000 per year with high ordering frequency. In contrast, the implementation of the JIT system reduced inventory costs to Rp 18,762,500 per year, achieving a cost efficiency of 72%. These findings indicate that the JIT system is more cost-efficient than the conventional method; however, its implementation requires careful consideration of supplier capacity, logistics readiness, and biological risks associated with live inventory. This study contributes empirical evidence on the applicability of JIT in the aquaculture sector, which has different characteristics from manufacturing industries.

The main problem in empowering fish farming communities in Dawuhan Village, Poncokusumo District, Malang Regency is how to empower communities through the Peti Koin Bermantra Program in Dawuhan Village, Malang Regency, such as low managerial capacity, weather constraints, high feed prices, and limited market access, which have an impact on the suboptimal economic improvement of the community. This study aims to analyze the implementation of the Peti Koin Bermantra Program in empowering fish farming communities to improve their economic welfare. The study uses a qualitative method with a descriptive approach, as well as the community empowerment theory of Hashemi, Schuler, and Riley (1996). The results show that the Peti Koin Bermantra Program contributes positively to improving community welfare through eight empowerment indicators, such as increased mobility, small-scale purchasing power, ability to make larger purchases, involvement in major decisions, freedom, political and legal awareness, participation in public protests and political campaigns, economic security, and contribution to family support. The success of the program was supported by collaboration between facilitators, the East Java Provincial Marine and Fisheries Service, and the Malang Regency Fisheries Service, although there were still obstacles in terms of capital, group management, and product innovation. To support the sustainability of the program,

This community service article presents the implementation of the GELORA outreach and training program conducted in Sebanen Village, Jember, Indonesia, focusing on the promotion of low-cost and eco-friendly fermented feeds formulated from locally available agricultural residues such as papaya leaves, rice bran, molasses, and EM4. The program aimed to strengthen the capacity of smallholder catfish farmers and the village enterprise (BUMDes) through a series of integrated activities including a rapid needs assessment, hands-on training sessions, technical mentoring, and knowledge dissemination. As a result, participants demonstrated improved technical skills in household-scale feed formulation and fermentation, a stronger understanding of sustainable and circular economy principles, and an increased willingness to adopt environmentally friendly aquaculture practices. Moreover, follow-up mentoring groups were established to ensure program continuity and local innovation. This participatory model effectively combines community engagement with scientific evidence in aquaculture nutrition and is suitable for replication in other rural aquaculture development contexts.

White Feces Disease (WFD), which infects Pacific white shrimp (Litopenaeus vannamei), poses a serious challenge in aquaculture due to its potential to cause mass mortality and substantial economic losses. One of the main causes of this disease is bacterial infection from the genus Vibrio. The use of natural substances, such as garlic (Allium sativum) extract, is considered a more environmentally friendly and sustainable alternative for disease control. This study aimed to examine the effect and determine the optimal concentration of garlic extract in inhibiting the growth of Vibrio sp. isolated from WFD-infected L. vannamei ponds, cultured on TCBS media. The study was conducted in vitro using the disc diffusion method with four extract concentrations (25%, 50%, 75%, and 100%) against two bacterial isolates, designated as isolate A and isolate B. The results showed that garlic extract was able to inhibit the growth of Vibrio sp., with the largest inhibition zone observed in isolate A at 75% concentration (14.8 mm) and in isolate B at 100% concentration (19.3 mm). These findings indicate the potential of garlic as a natural antibacterial agent to inhibit pathogenic bacteria and support the sustainability of shrimp aquaculture.

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.  

The Community Service Program (Kuliah Kerja Nyata/KKN) conducted by Mulawarman University in Muara Badak Ulu Village, Kutai Kartanegara Regency, focused on introducing and strengthening the existence of the Muara Berau Biccu Forest Farmers Group (Kelompok Tani Hutan/KTH) to the wider community. This group plays an important role as a community forum for managing forests in a sustainable and equitable manner, encompassing the utilization of both timber and non-timber forest products. As part of the program, the students designed and implemented several activities aimed at raising public awareness and encouraging participation. The methods included creating an identity signboard for KTH as an official symbol of recognition, installing educational boards highlighting the importance of mangrove planting for coastal ecosystems, conducting mangrove planting using the silvofishery system that integrates environmental sustainability with aquaculture productivity, and developing a blog as a digital information platform accessible to the public. Through these initiatives, the program sought to enhance community knowledge about the ecological functions of mangrove forests, the importance of sustainable pond management for long-term productivity, and the benefits of having an online information medium to promote, document, and expand the networks of KTH Muara Berau Biccu. The results demonstrated an increased level of environmental awareness among community members, active participation in mangrove planting activities, and the establishment of a new communication medium that has the potential to strengthen the group’s position at both local and regional levels. Overall, the KKN program contributed significantly to supporting sustainable community-based forest and coastal resource management.

This study aims to analyze the development strategy of vannamei shrimp (Litopenaeus vannamei) cultivation business in the intensive pond system at CV Jaya Tirta Vannamei, Probolinggo, East Java. The research applied a qualitative descriptive approach combined with SWOT analysis to evaluate both internal and external factors affecting the business. Data were obtained through observation, interviews, and documentation, then processed to generate alternative development strategies. The results show that CV Jaya Tirta Vannamei possesses strong internal resources such as experienced human resources, reliable production facilities, and good management capabilities. Externally, the company benefits from the rising demand for vannamei shrimp in domestic and global markets, the availability of modern aquaculture technology, and supportive government policies. Nevertheless, some challenges exist, including fluctuating shrimp prices, vulnerability to disease outbreaks, and relatively high operational costs, which may influence business continuity if not addressed effectively. Based on the SWOT analysis, the most appropriate development strategy is the S-O (Strengths–Opportunities) strategy, with an alternative strategy score of 3.72. The recommended strategies are: (1) increasing shrimp production through the adoption of advanced and sustainable cultivation technology, (2) developing and maintaining a reliable water quality management system to enhance productivity, (3) utilizing skilled human resources to strengthen innovation in cultivation techniques, and (4) ensuring the availability of sufficient and quality feed to support continuous production growth. In conclusion, implementing the S-O strategy provides an effective pathway for CV Jaya Tirta Vannamei to optimize its internal strengths in response to external opportunities. By improving technology application, strengthening resource utilization, and enhancing production management, the company can secure competitive advantage, increase productivity, and ensure long-term sustainability in the rapidly growing aquaculture industry.

Plankton are microorganisms that have an important role in aquatic ecosystems, especially in fisheries cultivation activities. The presence of plankton functions as natural feed for aquatic organisms, thus affecting the growth and survival of aquaculture biota. However, in the rainy season the quality of pond water often changes, especially in pH parameters, which can disrupt the stability of aquatic ecosystems. One of the efforts made to maintain pH stability is with periodic liming techniques. This study aims to determine the biodiversity of plankton in the Bossbaster cultivation pond by applying periodic calcification techniques. The research was carried out on October 10–23, 2022 at the Bossbaster cultivation pond. The study focuses on aspects of abundance, diversity, uniformity, and dominance of plankton, both phytoplankton and zooplankton. The results showed that the average phytoplankton abundance in pond 1 was 41,002 cells/L, pond 2 was 40,853 cells/L, and pond 3 was 32,826 cells/L. Meanwhile, the average zooplankton abundance in pond 1 was 51 ind/L, pond 2 was 52 ind/L, and pond 3 was 66 ind/L. The average value of the phytoplankton diversity index ranged from 0.809–0.930,  Meanwhile, zooplankton ranges from 1.1863–1.4740. The phytoplankton uniformity index ranges from 0.4458–0.4814, while zooplankton reaches 0.880–0.881. The phytoplankton dominance index is in the range of 0.479–0.4809, and zooplankton is in the range of 0.2645–0.3514. These findings show that periodic liming techniques are able to maintain the stability of pond conditions so as to support the sustainability of plankton as an indicator of water quality. Thus, the application of this technique can be an important strategy in supporting the sustainability of aquaculture while improving the efficiency of pond management in a sustainable, innovative, and adaptive manner to changes in the increasingly complex aquatic environment.

This study aims to analyze the economic and social impacts within the environmental context on the sustainability of catfish farming in Basanah Village. Environmental issues such as water quality, land availability, and land-use changes have significantly affected aquaculture practices. Moreover, the social dynamics of the surrounding community, including patterns of cooperation, public perception of catfish farming, and economic impacts on farmers’ income and welfare, are central to the investigation. This research employs a descriptive qualitative approach through field observations, in-depth interviews, and documentation involving local farmers, community leaders, and relevant stakeholders. The findings reveal that economic aspects, such as production cost efficiency and income improvement, are highly dependent on stable environmental conditions and strong social support. Conversely, environmental degradation and weak social participation hinder business development. Therefore, participatory-based policies integrating sustainable environmental management with the strengthening of local socioeconomic capacities are urgently needed. This study offers a significant contribution as a foundation for formulating empowerment strategies for environmentally and socially-based small-scale aquaculture enterprises at the village level.

Fisheries extension services play a strategic role in strengthening the capacity of fish farmers and accelerating the development of sustainable aquaculture businesses. The effectiveness of extension activities is strongly influenced by how fish farmers perceive the roles performed by fisheries extension workers. This study aims to analyze the level of fish farmers’ perceptions of the role of fisheries extension workers in developing aquaculture businesses in Loa Kulu District, Kutai Kartanegara Regency. In addition, this research examines the characteristics of fish farmers and analyzes the relationship between internal and external factors and the level of perception toward extension roles. This study employed a descriptive and correlational research design using both qualitative and quantitative approaches. A total of 42 respondents were selected from 719 fish farmers using the Slovin formula with a 15% margin of error and proportionate stratified random sampling across 10 villages. Data were collected through structured questionnaires using a Likert scale and analyzed using descriptive statistics and Spearman's rank correlation analysis. The results indicate that the overall perception of fish farmers toward the roles of fisheries extension workers—namely as educators, facilitators, motivators, innovators, advocates, organizers, and evaluators—falls within the high category. Among these roles, the organizer and facilitator roles received the highest perception scores. Internal factors such as age, income, and land area showed significant correlations with certain extension roles, particularly the roles of educator, motivator, and evaluator. External factors, including interaction with extension workers, interaction with traders, availability of market information, and access to aquaculture science and technology, were also significantly correlated with perception levels. These findings suggest that strengthening both socio-economic conditions and access to information and technology can enhance positive perceptions of extension services, ultimately contributing to more effective aquaculture development programs. The study highlights the importance of optimizing extension performance to sustain fish farmers’ productivity and welfare improvement.

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.

This study examines the production costs and profitability of crab farming enterprises in Prapag Kidul Village, Brebes Regency. Using a quantitative descriptive approach, data were collected through in-depth interviews, field observations, and financial documentation from crab farmers. The research found that feed costs constitute the largest component of variable costs, accounting for 30% of total production costs. Financial analysis revealed favorable profitability levels with a Gross Profit Margin of 33%, Net Profit Margin of 24%, and Return on Investment of 30%. Factors significantly influencing profitability include cost management efficiency, market price fluctuations, crab quality, and access to capital. The findings suggest that systematic financial recording and cost management strategies are crucial for improving business sustainability and competitiveness in the crab farming sector.

This study aims to analyze the service quality at Ketapang Urban Aquaculture (KUA), a mangrove ecotourism area in Tangerang Regency, using the Servqual theory encompassing five dimensions: tangibles, reliability, responsiveness, assurance, and empathy. This qualitative research utilized primary data from in-depth interviews with KUA management and secondary data from relevant literature. The findings indicate that physical facilities, such as trekking paths and informative signs, enhance visitor comfort. Educational programs run on schedule, and the complaint system effectively addresses visitor concerns. Friendly and well-trained staff provide a sense of safety and a positive tourism experience. However, challenges remain in optimizing sanitation facilities and digital promotion. The study concludes that KUA's service quality meets expectations, supporting sustainable ecotourism.

Tilapia (Oreochromis niloticus) production is very important to maintain food security and the Indonesian fisheries economy. Based on a literature study conducted from 2021 to 2024, this study aims to analyze the components that influence the productivity of tilapia cultivation. The method used is a literature study by reviewing various studies that discuss the technical, environmental, social, and economic aspects of tilapia cultivation. The results of the study indicate that government policies, fish density, feed, and water quality all affect the productivity of tilapia cultivation. In addition, there is evidence that advanced technologies such as biofloc systems and aquaculture transition systems (RAS) improve production efficiency and sustainability. This study provides suggestions for increasing productivity through optimal environmental management, use of appropriate technology, and policy support that supports farmers.