In recent years, the breeding of Chinese sturgeon in Jinhua City, Zhejiang Province, has experienced rapid growth. Currently, the number of farmed fish exceeds 15 million, with an annual output of over 6,000 tons and a value surpassing 300 million yuan. This industry has become a key pillar of the local fisheries sector. Despite criticisms regarding low product quality and excessive use of drugs in greenhouse farming, this method remains popular due to its short cultivation cycle, low costs, and broad market demand. Greenhouse farming now accounts for more than 80% of the city's sturgeon production and continues to expand. The adoption of pollution-free and healthy breeding techniques has further improved the viability of this approach.
By strictly following pollution-free standards—such as prohibiting the use of illegal drugs, ensuring proper use of feed additives, and maintaining clean water conditions—greenhouse-grown Chinese sturgeon can meet market requirements and gain consumer trust. In recent years, the price of greenhouse-raised sturgeon has also risen, reflecting growing market confidence.
To ensure sustainable and environmentally friendly breeding, Jinhua has established comprehensive guidelines. These include strict environmental controls, such as selecting sites that comply with GB/T 18407.4, ensuring no nearby pollution sources, and meeting NY5051 water quality standards. Greenhouses are built with proper insulation, heating, aeration, and drainage systems, while aquaculture ponds are designed to match the natural behavior of Chinese sturgeon, featuring specific dimensions, anti-escape structures, and hiding nets.
Egg selection is crucial, with eggs weighing between 3g and 5g, clear outlines, and no signs of damage or disease. Incubation takes place under controlled conditions: 30–31°C temperature, 85% humidity, and sand moisture levels maintained at 8–12%. After 40–45 days, hatching occurs, followed by careful handling of the young fish, including disinfection and proper stocking densities.
Feeding practices follow national standards, avoiding hormones and artificial colors. Daily feeding is carefully measured, with soft pellets used to promote digestion. Routine management includes regular inspections, monitoring water quality, and adjusting feeding based on fish behavior. Water changes are done monthly, and microbial agents are added to maintain a healthy aquatic environment.
Disease prevention emphasizes ecological methods, using biological agents and herbal medicines where possible. Strict regulations govern the use of fishery drugs, ensuring compliance with national guidelines and withdrawal periods. Harvesting is conducted in two stages, allowing for better market timing and maximizing yield.
Overall, pollution-free aquaculture in Jinhua is not just about technical standards but also about implementing standardized management practices. This includes tracking inputs like feed, seedlings, and medications, along with maintaining detailed records. These efforts ensure that the entire process meets high-quality and sustainable criteria, supporting long-term success in the industry.
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