Step 1: Understanding the Concept:
Cage culture involves rearing aquatic organisms inside floating or suspended net enclosures placed in open water bodies such as lakes, reservoirs, or marine environments.
Step 2: Detailed Explanation:
Historically, cage culture of fish originated in Kampuchea (modern-day Cambodia) in the late 19th century.
Fishermen in the Tonle Sap region constructed basic cages made of bamboo or wood to temporarily store and fatten wild-caught fish before selling them in the market.
From Cambodia, the practice spread to other parts of Southeast Asia, eventually evolving into the highly technical, intensive cage farming systems used globally today.
Step 3: Final Answer:
Cage culture was initiated in Cambodia.