Under normal circumstances, it can grow about two kilograms a year because bighead carp is an pelagic fish, which feeds in spring, summer and autumn, and belongs to a relatively fast-growing fish.
The culture period of bighead carp is about one year, which can grow to 1~2 kg. Silver carp and bighead carp are plankton-eating fish. They filter algae, zooplankton and organic debris through gill rakes, but it is difficult to eat food particles smaller than 10 micron, so artificial culture is suitable for lake areas.
Silver carp and bighead carp have high yield and fast growth. Mature individuals are also very small, generally more than 3 kilograms of female fish can reach maturity. The sexual maturity age of silver carp is 1-2 years earlier than that of grass carp. The relative spawning amount of 5 kg female fish is about 40,000-50,000/kg body weight, and the absolute spawning amount is 200,000-250,000. They lay eggs from April to May every year, and the spawning period is similar to that of grass carp, and the eggs are floating. Under the condition of pond culture, if the bait is sufficient, it can grow to 500-800 grams that year, weigh 30-40 kilograms in natural rivers, and weigh 3-4 kilograms for third-instar fish.
What's the difference between bighead carp and common silver carp?
1, head
Bighead carp grows slower than silver carp, with a big head but a small body. It can live in many areas of China, and is often farmed with silver carp, so these two kinds of fish are also classified as four major fish. Mainly living in the middle water layer of the pond, eating some rotifers, aquatic insects and so on. And it grows very fast, and it can grow 4~5 Jin in a winter. The head of bighead carp is much bigger than that of silver carp. Like a bighead carp weighing about ten kilograms, its head accounts for several kilograms. Why does bighead carp only have a long head and not a long body? It is said that all the nutrients it eats are absorbed by its head.
2. Variety and food are different.
Bighead carp and silver carp are four kinds of fish, but their species are different. Bighead carp belongs to the genus bighead carp, and silver carp belongs to the genus silver carp, which is very different. Although their shapes are similar, they are all flat-edged, but the difference is that the back of bighead carp is gray-black, the abdomen is white, and there are spots on both sides, while the back of silver carp is blue-gray, and the abdomen and both sides are white without spots. Bighead carp has a dark back and spots on both sides, which is different from silver carp. The main food of bighead carp is rotifer in water, which tends to eat meat, while silver carp mainly eats phytoplankton, and their food sources are different.
3. Different nutritional values
Because the two kinds of fish eat different foods and have different nutritional values, bighead carp is rich in protein, with lower fat and cholesterol content than silver carp, which contains fat. The best part of bighead carp is its head, which is big and fat. Silver carp is delicious only in the abdomen, and the meat is tender and delicate, but there are many fishbones, so be careful when eating.
We usually see more bighead carp in our daily life, and the price is good. Bighead carp and silver carp live in the same water layer, and many farmers will mix these two kinds of fish together, but it is easy to distinguish them.