Core Insights - The complete aquaculture of bluefin tuna in Japan is facing significant challenges, with the output from complete aquaculture dropping to 2% of total production in 2024, a decrease from 4% the previous year and 16% in 2020 [1][2] - Major Japanese seafood companies, including Kyokuyo and Nissui, have exited the complete aquaculture sector, leaving Maruha Nichiro as the only large company maintaining this practice, which is expected to see an 80% reduction in output by 2025 [1][2] Group 1: Current Production and Trends - In 2024, Japan's total output of farmed bluefin tuna is reported at 18,687 tons, an 11% increase from the previous year, but the complete aquaculture segment only contributes 405 tons [1] - The reliance on natural fry for 98% of the farmed bluefin tuna indicates a shift away from complete aquaculture methods, which are designed to prevent overfishing and ensure stable supply [2] Group 2: Future Outlook and Research - Despite current setbacks, complete aquaculture remains a promising technology for sustainable seafood production, with ongoing research from institutions like Kinki University aimed at improving fry development and reducing reliance on natural resources [2]