From Traditional Earthen Ponds to Land-Based Aquaculture: A Green Revolution in Fish Farming

With the continuous development of modern agriculture, the traditional earthen pond model is gradually exposing its drawbacks, driving the aquaculture industry toward land-based farming. Traditional pond farming is often at the mercy of the weather and highly vulnerable to water pollution and invasive species. For instance, if water quality deteriorates or invasive species like tilapia accidentally enter the pond, they can compete for feed, drive up costs, and even lead to massive die-offs or total crop failure. Furthermore, traditional ponds require vast areas of land, resulting in low land-use efficiency. The inability to precisely control the aquatic environment also makes fish more susceptible to disease and often results in a muddy flavor in the meat. These pain points have prompted an increasing number of farmers to explore and transition to land-based aquaculture.

Compared to traditional earthen ponds, land-based aquaculture (such as land-based circular tanks or raceways) offers comprehensive advantages. First and foremost is its exceptional space and land-use efficiency. A circular tank just a few meters in diameter can often match or even exceed the yield of an acre of traditional pond, significantly conserving land resources. It is not restricted by terrain and can be constructed in mountainous or hilly areas, or even in regions with relative water scarcity. Secondly, it offers a highly controllable and eco-friendly farming environment. Land-based systems often utilize Recirculating Aquaculture Systems (RAS). Through technologies like bottom drainage and multi-stage purification, these systems not only achieve the recycling and zero-discharge of tailwater but also allow fish to constantly swim and "exercise" in clean, flowing water. This high-density, high-oxygen, and pristine environment prevents diseases and parasites, resulting in fish like tilapia, catfish, and carp with firm flesh and no muddy taste—quality that far surpasses that of traditional pond-raised fish. Finally, management is highly efficient and increasingly smart. With the help of IoT technology, farmers can monitor water temperature, dissolved oxygen, and pH levels in real-time via a smartphone, while automating feeding and oxygenation. This drastically reduces labor costs, making it a reality for one person to manage dozens of tanks.

Looking ahead, land-based aquaculture is thriving toward greater intelligence, ecological sustainability, and full industry-chain integration. Technologically, as biofloc technology, RAS, and genetic breeding big data are applied more deeply, future land-based farming will become even more precise and efficient. For example, by implanting chips or using smart cameras, farmers can accurately track the growth traits of every batch of fish, achieving optimal selection. Through in-situ microbial regulation, it may even be possible to achieve zero water exchange throughout the entire farming cycle. In terms of business models, land-based aquaculture will no longer be limited to the farming stage alone. It will expand into ecological circular models like "circular tanks + rice/vegetables/fruits," where purified tailwater is used directly for agricultural irrigation, creating a closed loop of "water nourishing fish, fish enriching water, and water fertilizing crops." Meanwhile, relying on the stable, high-quality output of land-based systems, downstream sectors like deep processing (e.g., liquid nitrogen flash-frozen fillets, ready-to-eat meals) and brand traceability (e.g., "one fish, one code") are poised for explosive growth, truly turning "small circular tanks" into a "major industry" that drives rural revitalization.