How many jin can a grass carp gain in a year? Raise it this way and it grows big and fast
Grass carp is a type of fish, and it is also a fish we commonly see and often eat. It helps prevent cancer and osteoporosis symptoms, and can also supplement some of the nutrients the human body needs. As people's demand for grass carp grows higher and higher, farming grass carp has also become one of the hottest farming projects today. So do you know how many jin a grass carp can gain in a year of farming? How should you raise it so it grows fast?
How many jin can a grass carp gain in a year
Generally, if you stock fry of half a jin, feed them grass that same year, and feed them enough, they can grow to more than 3 jin by the end of the year.
Grass carp grows quickly. Over the whole growth process, the period of fastest body length growth is at 1-2 years of age, while the fastest weight growth is at 2-3 years of age. Once the 4-year-old fish reaches sexual maturity, growth slows down markedly. A 1-winter-old fish is about 340 mm in body length and about 750 grams in weight; a 2-winter-old fish is about 600 mm in body length and 3.5 kg in weight; a 3-winter-old fish is about 680 mm in body length and about 5 kg in weight; a 4-winter-old fish is about 740 mm in body length and about 7 kg in weight; a 5-winter-old fish can reach about 780 mm in body length and about 7.5 kg in weight; the largest individual can reach about 40 kg.
How to raise grass carp so it grows big and fast
1. Stock the fry after Qingming Festival in April. In April, tender shoots and tender grass can be seen everywhere on the land. At this time, at nine in the morning you can cut the fine tender weeds in the fields to feed the fry. The feeding amount should be finished within 3 hours, and feeding feed at 4 in the afternoon should be finished within two hours.
2. In early spring, you can also plant elephant grass and other forage grass to increase green feed. Elephant grass is drought-tolerant and has strong growth power, with protein at 16 percent.
3. By mid-May, the cassava planted by farmers can have its branches cut to feed grass carp. That is, after cassava is planted it grows 1 to 4 stems, and you keep only one and cut off the extra ones, which is good for growth. The protein content of cassava leaves is about 20 percent. The feeding amount of cassava leaves should be finished within 3 hours, and feeding feed at 4 in the afternoon should be finished within two hours.
4. Use bamboo to make a square feeding frame to make feeding easier. After feeding, the cassava stems should be fished out in time, so they do not rot in the water and affect water quality.
5. Cassava leaves and elephant grass should alternate every other day to increase feeding with different nutrients.
6. After 8 to 9 months of careful feeding with green feed and feed, the weight of grass carp can reach between 4 and 5 jin. Grass carp raised this way has good meat quality, and the price is more than double that of grass carp fed only with feed.
7. Feeding should be timed and quantitative. On overcast and rainy days, do not feed the fish or feed less. For feed, choose manufacturers with a good reputation.
Feed formulation for grass carp
1. Rice straw 50%, rice bran 25%, soybean cake 25%. For every 100 kg of the above mixed material, add another 10 kg of flour scraps as a binder. The feed's crude protein content is 23.35%, the feed coefficient is 2.8, and the feeding size is about 0.05 kg per fish.
2. Rice straw 50%, rice bran 22.5%, wheat bran 5%, soybean cake 15%, fish meal 5%, bone meal 1%, salt 0.5%, vitamin additive 1%. The feed's crude protein content is 18.78%, and the feed coefficient is 2.4.
3. Flour 30%, rice bran 8%, wheat bran 38%, soybean cake 10%, fish meal 10%, yeast powder 2%, premix 2%. The feed coefficient is 1.9. If green feed is also added, the feed coefficient is 2.2.
4. Flour 30%, fish meal 10%, soybean cake powder 15%, wheat bran 25%, rice bran 20%. On the premise that the total amount of the basic diet remains unchanged, according to actual conditions you can also add sweet potato powder 12%, salt 0.5%, growth hormone 2%, and calcium hydrogen phosphate 2%. The feed coefficient is 4.8.
Notes on feeding grass to grass carp
1. Reduce feeding of aquatic water grasses: According to experimental observation, grass carp can gain 1 kg of meat by eating 15 kg of terrestrial water grass, while it takes eating 60-80 kg of aquatic water grass to gain 1 kg of meat. Therefore, when the source of terrestrial water grass is sufficient, you can feed less or not feed aquatic water grass.
2. Feed more fresh tender forage: Fresh tender forage is rich in nutrition, low in cellulose, and easy to digest. When grass carp eats fresh tender forage, it can grow fast and get sick less, and it can also reduce the feeding amount, lower farming costs, and improve economic benefits. Therefore, for the forage fed to grass carp, choose fresh tender forage as much as possible. The type of forage should be long-leaf green tender grass with parallel veins, and it is not suitable to feed round-leaf forage with netted veins that grass carp dislike eating. It is best to feed planted forage grasses such as ryegrass and Sudan grass, and collected wild long-leaf tender grass.
3. The feeding method must be appropriate: When feeding grass to grass carp, feed at fixed times, in sufficient amounts, and evenly every day. Try to spread the forage out so the fish eat their fill and eat well. Adjust the feeding amount according to specific conditions such as weather, water quality, and fish activity. It is strictly forbidden to feed forage that has been stored too long or is moldy and spoiled, to avoid grass carp being infected with diseases.
4. Feed according to the fish's mouth size: In the juvenile stage, grass carp have a small mouth size, so you cannot feed coarse, hard forage. It is better to feed small duckweed, nutgrass and other forage, or chop fresh tender long-leaf grass into pieces before feeding. Later, as the fish age increases, the mouth size gradually increases, and you can transition to feeding regular fresh tender forage.
The above is a summary of grass carp farming techniques compiled by the editor, and I hope it can be helpful to everyone. Grass carp itself grows fast, and with scientific feeding later on, its growth rate can also be accelerated, but do not use hormones or drugs just to speed up growth!