Life Habits, Feeding Habits, Growth and Reproduction of Blackfish

Blackfish I think we are very familiar with, often eat in life, the nutritional value of blackfish is very high, it is rich in protein, so for some weak and sick people, or some old people and children are very suitable.

The living habits of Blackfish

Black fish are benthic fish that live in a wide range of habitats. Therefore, where frogs, Loach, crucian carp and all kinds of aquatic insects live in groups are all places where black fish like to live. Black fish often lurk in shallow water with a depth of 1 meter. The living temperature of the black fish is 0 ℃ 41 ℃, and the optimum temperature is 16 ℃ 30 mol. When the water temperature rises above 8 ℃ in spring, the black fish begins to move and swim from the best aphrodisiac to the shallow water to find food. It grows faster when the water temperature is above 20 ℃.

When it is sultry and rainy in summer, it tends to jump out of the water and crawl on the wetlands on the shore. In autumn, when the water temperature drops to 12 ℃, stop feeding; drop to 6 ℃ and move to deep water. When the water temperature is too low in winter, it is buried in the mud to survive the winter, as long as there is water under the ice. Black fish can tolerate hypoxia. It can also survive in turbid and anoxic water. When there is a lack of oxygen in the water, the fish can put its head out of the water and use the organs on the gills to directly absorb the oxygen in the air for gas exchange. PH value: black fish can generally live in acidic and alkaline waters. Black fish is good at jumping: its jumping ability is very strong, and its jumping is also high. It is easier to stimulate the black fish to jump and escape when there is water impact and rain, and often go up with the current.

The feeding habits of black fish

Black fish are fierce carnivorous fish. Mainly feed on small fish, shrimp, frogs and tadpoles, aquatic insects and other aquatic animals. The specific kinds of food consumed vary with the size, season and water environment of the fish. But in any case, it will not change the nature of its carnivorous nutritional type. Black fish is a common edible fish in China, with large size, fast growth and high economic value. However, for the hot market, the black fish culture cycle is still relatively too long.

The growth of black fish

The fish hatched that year are generally about 150 mm long and weigh about 50 grams. The body length of 2-year-old fish accelerated the growth stage and grew vigorously. After 2 years old, it showed a decreasing trend with the increase of age. When the water temperature is 20 ℃ and 25 min, the growth rate is faster. The vitality of black fish is very strong, and the meat is sweet, it contains a lot of iron, calcium, phosphorus and other minerals, nutrients are also very rich, including fat, protein, vitamin A, B vitamins and so on. In addition, every 100 grams of black fish, the protein content can be as high as 20 grams, second only to shrimp, and eating black fish is easy to be digested and absorbed by the human body, often eating black fish can enhance resistance.

Reproduction of black fish

1. The age of sexual maturity. The Yangtze River basin is generally 2 winter years old, and the local area generally begins to mature and lay eggs in the third year.

2. The number of eggs laid: the average number of eggs laid by an individual is 10-30,000, with a maximum of 50000-60000. The number of eggs is different in individuals of different ages and sizes and in different water bodies.

In recent years, the aquaculture industry in China has been developing rapidly, so the culture of black fish has gradually become more and more common. The market demand of black fish in our country is quite large, but the cost of black fish culture is more than that of other fish farming.