Detailed Explanation of Key Technical Points for Pond Culture of Grass Goldfish

The grass goldfish resembles the Japanese koi in appearance. It is a variety formed from red and yellow crucian carp through variation under artificial rearing, and is the oldest variety of goldfish. Because its rearing conditions are simple, rearing costs are low, it is omnivorous, and it grows quickly, it can be used by beginners for self-training to improve their aquaculture skills. Let us take a look below at the pond culture techniques for grass goldfish!

Pond Conditions

For ponds used to culture red crucian carp, the pond mouth area is generally required to be 5-8 mu, the pond depth 2.8-3.0 m, the pond wall slope 12.5-3.0, and the effective water storage depth 2-2.5 m. High-yield intensive culture ponds need to be equipped with aeration machinery, with a power of 1.5 kW per 3-5 mu.

Fingerling Stocking

Before stocking fingerlings, the selected pond should be cleared with chemicals to kill pathogens and harmful organisms. In order to improve the survival rate of culture and the market size, winter stocking of fingerlings should be advocated. The stocking density is generally 1000-1500 fish per mu for fingerlings of 30-50 fish per kilogram, with an additional 250-300 fish per mu of silver carp and bighead carp (41) spring fingerlings. When stocking fingerlings, soak them in a mixture of 3% salt water and a 10×10-6 concentration potassium permanganate solution for 10-15 minutes.

Feed Feeding

In ponds mainly culturing red crucian carp, the feed used is required to have a protein content of more than 30%. The daily feeding rate is: 1-1.5% in April-May, 2.5-6% in June-August, and 2-1.5% in September-October. Among these, in June-August, some green feed can be appropriately fed. Feed should be fed at fixed points, and 3-5 feeding platforms can be set up in each pond. Feed 1-2 times a day. The specific feeding amount should be flexibly controlled according to the weather and the actual feeding situation of the fish, and generally it is appropriate to leave a slight surplus before the second feeding.

Water Management and Disease Prevention

During the production season, regularly adding and changing new water is very necessary for the growth of red crucian carp. Generally in summer, add new water once every 10-15 days. Each time, the amount of added or changed new water is 20-50 cm. When changing water, first drain and then fill, that is, first drain water from the bottom of the pond, then add water to the pond surface. Adding and changing water should be carried out at noon on clear, fine days. At the same time, insist on normally running the machine for 1-2 hours at noon on clear days. For water quality management, in addition to doing a good job of the medicated bath before fingerlings are put into the pond, during the culture period splash the whole pond with strong chlorinated disinfectant once every 10-15 days. The medication concentration is 0.2×10-6-0.3×10-6. In high-temperature seasons, add oral medicines such as Kebao Ling to the feed, with a dosage of 100 grams of medicine per 1000 kilograms of fish per day, 1-2 times a month, each time for 3-5 consecutive days, which can effectively prevent fulminant diseases such as enteritis and hemorrhagic disease.