Land breeding system

Beside vast rural fields or in vacant courtyards, rows of blue galvanized steel fishponds gleam metallically in the sunlight, like dazzling pearls embedded in the earth. This is the scene of land-based, factory-style recirculating aquaculture, which has quietly emerged in recent years and is changing our preconceived notions of traditional fish farming by digging ponds.

Entering this aquaculture area, the first thing that catches the eye is the rows of round and orderly galvanized steel fishponds. Neatly arranged, with sturdy and smooth walls, they create a modern agricultural landscape against the backdrop of blue skies and white clouds. These fishponds are typically 8 to 10 meters in diameter and about 1.5 meters deep, with a water volume of 80 to 100 cubic meters per pond. Unlike the tranquility of traditional earthen ponds, these are full of vibrant, dynamic beauty. The aeration equipment stirs up the water, injecting a continuous stream of vitality into the ponds. In the ponds, whether it's the lively California bass, the agile snakehead, or the precious grouper, they all swim freely in the clear water. Taking California bass as an example, a single circular pond with a diameter of 10 meters can yield 1500 to 2000 kilograms, equivalent to the yield of 3 to 5 acres of traditional earthen ponds.

This aquaculture model using galvanized steel sheets is a culmination of modern engineering technology and aquaculture wisdom. The excellent corrosion resistance of galvanized steel sheets ensures that the fishponds remain structurally stable even under prolonged exposure to sun and rain, with a service life of over 15 years. Its smooth inner walls effectively reduce the attachment and growth of pathogens, providing a clean and healthy habitat for the fish. More importantly, this intensive aquaculture method liberates fisheries from dependence on natural water bodies, achieving a breakthrough of "occupying land but not water." Equipped with a highly efficient circulating water treatment system—physical filtration to remove uneaten feed and feces, biological purification to decompose ammonia and nitrite, and sterilization and oxygenation to replenish dissolved oxygen—it achieves a water recycling rate of 90% to 95%, requiring only 5% to 10% fresh water replenishment daily. This significantly conserves precious water resources and almost achieves zero or compliant discharge of aquaculture wastewater, protecting our vital environment.

For aquaculture workers toiling outdoors, the land-based circular pond also offers unprecedented convenience. The circular pond design, combined with a central waste collection and discharge system, creates a swirling effect in the water flow, allowing uneaten feed and feces to quickly collect at the central discharge outlet. Approximately 70% of solid waste can be effectively collected within 10 minutes. The water's strong self-purification ability greatly reduces the labor intensity of manual waste removal. Daily operations such as feeding, observation, and harvesting have become highly efficient and convenient. A skilled worker can easily manage 20 to 30 fishponds, each 10 meters in diameter, with a total water volume exceeding 2,000 cubic meters, equivalent to managing nearly 100 acres of water surface under traditional aquaculture methods, significantly improving production efficiency. This model not only reduces aquaculture risks but also increases output and economic benefits per unit area—typically, each cubic meter of water can produce 15 to 25 kilograms of fish, 5 to 10 times that of traditional pond aquaculture.

Watching the workers busily at work and seeing the hope on their faces, we deeply felt that land-based galvanized steel plate fishpond aquaculture is not simply "moving fish ashore," but a profound revolution in fisheries. It achieves efficient use of land resources, giving new life to many saline-alkali lands, barren slopes, and idle lands that were originally unsuitable for fishpond excavation. For example, a land-based recirculation system occupying only 2 acres can produce an annual output equivalent to the capacity of 20 acres of traditional ponds, while saving over 80% of water. It aligns with current consumer demand for green, high-quality aquatic products. Through a controlled environment, the fish raised have firm flesh, delicious flavor, and are safe and pollution-free—tests show that fish raised under this model have over 90% less geosmin, a substance that imparts a muddy odor.

As the sun sets, its afterglow spills onto the shimmering surface of the ponds, reflecting a warm glow from the galvanized steel sheets. These circular ponds not only house frolicking fish but also represent the hope for rural revitalization and the dream of fisheries transformation and upgrading. Taking California bass farming as an example, a 10-meter diameter circular pond can generate 30,000 to 40,000 yuan in output value per season, with a net profit of approximately 15,000 yuan after deducting costs. It proves that modern agriculture does not have to be divorced from industrial civilization but can cleverly combine modern materials, intelligent equipment, and ecological concepts to forge a path of sustainable development that is highly efficient, resource-saving, and environmentally friendly. Outdoor land-based galvanized steel sheet fish ponds, with their vibrant vitality, are adding more healthy and delicious flavors to our tables and painting a new picture of abundance for the vast countryside.