International Conference Presentation about Fishery

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1. Techno-Economic Feasibility Assessment of Stick-Net Cage Installation for Milkfish Fishpond in Tanjung Mas Waters, Indonesia Nana Kariada Tri Martuti ; Inaya Sari Melati ; Wahid Akhsin Budi Nur Sidiq ; Dhita Prasisca Mutiatari Universitas Negeri Semarang, Indonesia

2. INTRODUCTION a high-rate production of milkfish ( Chanos chanos ) with a total of 328.65 tons in 2020 the north side of Semarang is bordered by the Java Sea with a coastline length of 13.6 km strong waves and brackish water. the application of stick net cage in fish farming the Indonesia fish consumption shows an increasing trend of 7.37% per year

3. RESEARCH QUESTIONS the application of stick net cage in fish farming SUSTAINABLE? Techno-Economic Feasibility Assessment ENVIRONMENTAL FACTORS CULTIVATION PROCESSES FINANCIAL ANALYSIS

4. METHODOLOGY in-depth interviews field observation documentation laboratory test

5. RESULTS AND DISCUSSION ENVIRONMENTAL FEASIBILITY Parameter Range Mean Recommended Value depth (m) 4 - 6 4.4 > 10 - < 20 brightness (cm) 7 – 14.12 0.9445 ≥ 5 pH 6.4 - 7.5 7.01 6 - 8 TABLE 1. Environmental Factors in the Tanjung Mas Waters FEASIBLE

6. RESULTS AND DISCUSSION CULTIVATION PROCESSES FEASIBLE With some recommendation Alternative fish feed fish vitamin distribution process The total area of potential waters in the stick-net cages cultivation system was 119.51 ha 20% = 10 units or 23,902 ha 22 units or 53.45 ha

7. RESULTS AND DISCUSSION FINANCIAL FEASIBILITY TABLE 2. Financial Feasibility Analysis (per 1 ha) FEASIBLE A. Total Cost 89,430,000 B. Revenue 8000 kg 18,000 144,000,000 C. Total Gain (B-A) 54,570,000 D. R/C Ratio (B/A) 1.61019792 E. Profit/kg 7,346.41

8. CONCLUSION The environmental factors are the first consideration for implementing stick-net cages in milkfish cultivation. This study found that after the installation of stick-net cages, the depth, brightness, and pH in Tanjung Mas waters are still suitable for milkfish cultivation. It means, this new method does not affect the milkfish habitat to grow and breed. However, in terms of cultivation processes , the number of installed stick-net cages are found exceed the maximum capacity from the ideal state. Based on the theory and experience that has been found, it will inhibit the growth of milkfish so that it cannot reach its maximum weight in the ideal time and prolong harvest time. This study suggests to re-installed some stick-net cages to optimize the milkfish production. Meanwhile, in terms of finance , some issues have been found to be addressed to minimize costs and optimize profit. Separation of business entity and insurance understanding should be what fish farmers and local government need to pay attention to. The limitation of this study is technically it does not examine pollutant loads such as P, N and aquaculture waste due to resource and time limitation. Therefore, it is recommended for the next research agenda to extend the laboratory test to provide more comprehensive results of environmental factors of implementing stick-net cages in milkfish cultivation.

9. THANK YOU Nana Kariada Tri Martuti ; Inaya Sari Melati ; Wahid Akhsin Budi Nur Sidiq ; Dhita Prasisca Mutiatari Universitas Negeri Semarang, Indonesia