Fully farmed eel to be sold in Japan for the first timeーNHK WORLD-JAPAN NEWS

Key Concepts

• Full-Cycle Farming: A method of aquaculture where the entire life cycle of an organism, from egg to adult, is managed in captivity.
• Leptocephalus: The flat, transparent, leaf-like larval stage of an eel.
• Glass Eel: The juvenile stage of an eel, characterized by a transparent body, which occurs after the larval stage.
• Kabayaki: A traditional Japanese method of preparing eel, where the fish is split, gutted, butterflied, cut into squares, skewered, and dipped in a sweet soy-based sauce before being grilled.
• Sustainable Marine Resources: Practices that ensure the long-term viability of fish populations by preventing overfishing and environmental degradation.

---

1. The Crisis of Wild Eel Stocks

Japanese eel (Anguilla japonica) is a cultural staple with a history spanning over 1,000 years. However, the species is currently endangered due to environmental changes and overfishing.

• Statistical Decline: Catches plummeted from a peak of 3,387 tons in 1961 to a mere 52 tons in 2024.
• Market Dependency: Currently, over 70% of the 60,000 tons of eel consumed annually in Japan is imported from China and other nations.
• Conservation Status: Japanese eels were designated as an endangered species in 2014, while European eels are classified as critically endangered.

2. The Evolution of Full-Cycle Farming

For over 50 years, researchers have sought to make full-cycle farming commercially viable to reduce reliance on wild-caught glass eels.

• 1973: Hokkaido University researchers successfully hatched eel eggs in a lab for the first time.
• 2002: A government research center successfully raised larvae to the glass eel stage using shark eggs as feed.
• 2010: The major breakthrough occurred when researchers achieved full-cycle cultivation, enabling eels to breed and produce their own offspring in captivity.

3. Methodological Breakthroughs and Cost Reduction

The primary barrier to commercialization was the prohibitive cost of production.

• Initial Costs: In the early stages, it cost approximately 40,000 yen (over $400 at the time) to raise a single glass eel.
• Optimization Techniques: Researchers replaced expensive feed with chicken eggs and engineered specially shaped water tanks to improve the survival and growth rates of the larvae.
• Current Economics: The cost per glass eel has been reduced to 1,800 yen (approx. $11). Consequently, the retail price for a fully farmed eel is currently set at a premium of 5,000 to 6,000 yen (over $30).

4. Future Outlook and Strategic Goals

The current trial sales in Tokyo represent a significant milestone, but the industry faces ongoing challenges regarding scalability and affordability.

• Production Targets: The fisheries company aims to scale production to 100,000 glass eels per year by 2028.
• Market Expansion: The government is encouraging other companies to enter the market to increase competition and supply.
• Challenges: Beyond technical difficulties, companies must overcome high initial investment costs, the need for specialized staff, and the necessity of lowering retail prices to make the product accessible to the general public.

5. Notable Statements

• Fisheries Company Representative: "Test marketing isn't the goal. It's the starting point."
• Industry Perspective: "It is very important to keep culinary traditions alive by allowing eels to be bred both through conventional and full-cycle farming."
• NHK World Correspondent: "New approaches are needed if Japan's food culture is going to survive."

---

Synthesis

The transition to full-cycle eel farming marks a pivotal shift in Japanese aquaculture, moving from a reliance on dwindling wild populations to a controlled, sustainable production model. While the technology has successfully moved from laboratory research to commercial trial, the industry remains in its infancy. The long-term success of this initiative depends on the ability to scale production volume, which is the primary lever for reducing the current "sticker shock" pricing and ensuring that this traditional culinary staple remains available for future generations.