Detailed Explanation of Key Points for High-Density Culture of Topmouth Gudgeon
The stocking density for topmouth gudgeon culture is 8-10 fish per mu. Before stocking, the pond should be disinfected 7-10 days in advance. They can be fed oil bran or a homemade compound feed. In the early stage of topmouth gudgeon fry, keep the water level relatively low, that is, 50-80 cm. As the water temperature rises and the fish grow, add about 20 cm of water each week. If the pond water becomes too fertile, replace 1/5 of the water every 5 days. In addition, regularly splash the entire pond with bactericidal and insecticidal drugs to prevent and control diseases.
The specific high-density culture techniques for topmouth gudgeon are as follows:
1. Stocking of topmouth gudgeon fry
7-10 days before stocking topmouth gudgeon, thoroughly clear and disinfect the pond with quicklime, then apply biological fertilizer to cultivate rotifers, keeping the pond water transparency at 20-25 cm. Stock 80,000-100,000 summer fry of topmouth gudgeon per mu, and feed oil bran. Feed according to season, temperature and growth conditions, generally 1-3 times per day. After 3-5 months of feeding, they can reach market size, at 120-160 fish per kilogram.
2. Feed feeding for topmouth gudgeon
Topmouth gudgeon is an omnivorous fish that mainly feeds on zooplankton. During culture, it can be fed oil bran or a homemade compound feed. The feed formula is 38% domestic fishmeal, 21% rapeseed meal, 12% cornmeal and 29% wheat flour. Under normal conditions, feed twice a day, with the feeding amount at about 5% of the fish body weight in the pond.
3. Water quality management
In the early stage of fry, keep the water level relatively low, generally 50-80 cm. As the fish grow and the water temperature rises, gradually deepen the water level, generally adding water once a week, about 20 cm each time. When the pond water becomes too fertile, improve water quality through reasonable water addition and fertilization, and if necessary, adopt continuous circulating micro-flow water. Generally, change the water once every 5 days or so, with each water change amounting to 1/5 of the pond water, and apply microbial preparations once every 10-15 days.
4. Disease prevention and control
To prevent the occurrence of some bacterial diseases, regularly splash the entire pond with bactericidal and insecticidal drugs such as strong chlorine essence, chlorine dioxide, avermectin or deltamethrin, and strictly carry out disease prevention and control in accordance with the "Guidelines for the Use of Fishery Drugs", without using prohibited drugs.
In addition to serving as a high-quality bait fish, topmouth gudgeon is also very good as a delicious and nutritious edible fish, with a fresh taste and simple preparation.