Detailed Explanation of High-Yield Crucian Carp Farming Methods and Techniques

    In recent years, crucian carp has become one of the popular species in freshwater aquaculture due to its strong adaptability, omnivorous feeding habits, fast growth, strong disease resistance, and delicious flesh. So how can crucian carp be raised as the main species in ponds and reach high yield within the same year?

    Appropriate Density

    In order to reduce farming costs, it is best to cultivate large-size crucian carp fingerlings in your own pond, stocking 0.8-1.2 ten-thousand summer fry per mu, and after growing them to 50-60 grams, transfer them to another pond for grow-out farming. The optimal stocking density is 1500-1800 fingerlings of 50-60 grams per mu, which can bring the market fish size to over 350-400 grams.

    Companion Species

    When cultivating large-size crucian carp fingerlings, do not mix in grass carp and common carp; instead, choose silver carp and bighead carp, with the quantity preferably accounting for about 20% of the main crucian carp, and bighead carp accounting for about 10% of the silver carp. The stocking time of companion species should not be too early; in particular, introducing bighead carp too early has a greater impact on the domestication of crucian carp.

    Fingerling Domestication

    Crucian carp is a fish that lives in the middle and lower layers of the water body. In ponds where crucian carp is the main species, the fingerlings must be domesticated so that all crucian carp can quickly rise to the surface to compete for food after feeding, which is very beneficial to the growth of crucian carp. Five points should be noted during domestication: First, domestication is relatively easier during the fingerling cultivation stage; second, during domestication, an appropriate amount of additives can be added to the feed to shorten the domestication time; third, when the stocking density has already been determined, the pond water level can be lowered during domestication to relatively increase the density, which is more conducive to domestication; fourth, silver carp and bighead carp fingerlings should be stocked after the habit of the main crucian carp rising to the surface to compete for food has been formed; fifth, during domestication, the pond water quality should be "clear and lean" rather than "turbid and fertile."

    Feed Particle Size

⟧    The feed particle size for feeding crucian carp should be "choose smaller rather than larger." For crucian carp below 10 grams, choose feed with a particle size of 0.5 mm; for 10-30 grams, choose 1 mm; for 30-75 grams, choose 1.5 mm; for 75-100 grams, choose 2 mm; for 150-300 grams, choose 2.5 mm; for over 300 grams, choose 3.2 mm.

    The feeding rate for crucian carp ponds should be determined according to the size of the crucian carp and the pond water temperature. At 25-50 grams, the feeding rate is 2-3.5%; at 50-100 grams, the feeding rate is 1.7-3%; at 100-200 grams, it is 1.4-2.6%; at 200-300 grams, it is 1.2-2.3%; and above 300 grams, it is 1-1.9%. When the water temperature is below 15°C, the feeding rate should take the lowest value; at 16-23°C, crucian carp has a relatively strong feeding ability, and the feeding rate should take the average value; when the water temperature is 24-29°C, it is the period when crucian carp has the most vigorous appetite, and the feeding rate should take the highest value to ensure sufficient bait.

    Disease Prevention and Control

    Crucian carp has strong disease resistance and no major infectious diseases. Relatively speaking, hemorrhagic anchor worm disease is more harmful. Its main features are that crucian carp floats slowly and swims weakly, with a pale white color; needle-like parasites can be seen on the abdominal surface and both sides of the dorsal ridge of the fish body; at the sites where the parasites attach, there are blood-congested red spots the size of mung beans or peas; the scales at the lesion sites are loose or shed, mucus increases, and a few form obvious ulcers. During the disease season, for small-area main culture ponds, splash 0.3 grams of 90% crystallized trichlorfon per cubic meter every half month; for large-area crucian carp culture ponds, trichlorfon can be hung in baskets (bags) around the feeding area, 1-2 times per month, each time for 2 consecutive days, all of which have good preventive effects. For diseased ponds, a one-time splash of 0.5 grams of 90% crystallized trichlorfon and 0.2 grams of ferrous sulfate mixture per cubic meter has a good effect.