Blackberry 鲈 practical breeding technology essentials
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The BlackBerry is a popular fishing game in the United States and is also a favorite food fish. Its muscles are white, firm, and easy to peel off to make fish fillets, and the fat content is low. Fish fillets can be stored in the frozen state for a long time. The taste of the food is slightly fibrous and the taste is excellent. Consumers like to treat bread and butter. it. In our country, the general price is now 80-90 yuan / kg. With high economic value, there is great potential for aquaculture development.
First, the biological characteristics of blackberry
1, appearance characteristics
The black mullets have a short body, a round back, a straight belly, and an elliptical side view. The entire fish body is covered with small dots. The fish is flat on the side and resembles China’s Wuchang fish. Its head is small, its head back is olive, brown or gray-green, its abdomen is silver-gray, and it has irregular black on the head and body sides. Spot, bright colors. The breeding season is dark black in males and light black in females. The scales are rough and dark and the "ear caps" are slightly pointed. Eyes are large, lying on the front of the head, and the distance from the dorsal fin is more than one-half of the body length. Dorsal fins and caudal fins are longer, with a hard thorn extending from the anterior end to the anteroposterior peduncle; the pectoral fins are fan-shaped and transparent, with no hard thorns; caudal fins are relatively large, with concave tails.
2, diet and feeding intensity
Black Stork is a meat-eating omnivorous fish. The fish is gentle and has a low appetite. It is mainly based on animal foods. Fry of 2-3 cm in length mainly eats zooplankton such as rotifers, cladocera, and copepods; it can take in water when it grows to 5-6 cm in length. Insects, organic debris; black-crested squid at the adult stage is dominated by large zooplankton, benthos, and small fish. In the case of artificial breeding, it can be fed granular compound feed or various kinds of animals under the miscellaneous, small fish shrimp. Feeding high-protein-containing compound feeds, Blackberry can get the highest growth rate.
3, ecological habits
Black Stork has strong adaptability and can grow well in both north and south China. Black Stork is a kind of warm-water fish. Its survival temperature is 1-38°C, and the optimum growth temperature is 15-25°C. When the water temperature is lower than 10°C or higher than 30°C, it is poor in feeding and slows down. Blackberry lice start to have uncomfortable reactions when the water body temperature reaches 39°C. The main manifestation is that the fish body loses its balance and the activity is non-directional. When the water body temperature is higher, it rushes up and down, then it floats on the water surface, and it stops breathing and dies. The muscles of the fish harden immediately and cannot be saved. The pH range of the blackberry pods is 6.0-9.5, the optimum range is 7.0-8.0, and the oxygen consumption is large. The dissolved oxygen in the pool is required to be maintained above 4 mg/l. Below 3 mg/l, the appetite and growth will be affected. In most of our country's ponds, lakes, reservoirs and rivers, we can grow well.
4. Blackberry Habits Habits
It is a freshwater, temperate fish. Living in the middle and lower layers of the water body, like to perch in calm lakes and ponds, especially like to swim in the slow fresh water. In the U.S. origin, it mainly inhabits calm lakes, ponds, potholes, and gurgling pools of small rivers. It is now cultivated and domesticated to adapt to more fertile water, but it requires a plant environment.
5. Breeding habits
When the water temperature rises to 16°C, it starts nesting and spawning, the spawning temperature range is 16-24°C, and the spawning peak water temperature is 18°C. It can spawn multiple times, each time. Thousands of grains, mostly in the early morning when spawning. After spawning, the females leave the fish's nest, and the males take care of the fish eggs to prevent the enemy from swallowing food. The fish nests are buoyed, the eggs are raised in oxygen, and the debris in the fish nests are removed until the fry hatches. The fish can not only produce eggs naturally, but also produce artificially. It can be used to produce large-scale seedlings.