Blackfish pond ecological breeding technology

Blackfish, also known as the black tadpole, is a fast-growing fish species that's highly suitable for aquaculture due to its strong resistance to diseases. It has become a premium choice for pond farming. To ensure successful cultivation, proper pond conditions, careful stocking, appropriate feeding, and consistent management are essential. First, pond setup is crucial. The ideal pond area ranges from 1 to 10 acres, with a water depth of 1.5 to 2 meters. The pond embankment should be 40 to 50 cm higher than the water level, and it should be surrounded by fences made of bamboo or nylon nets, at least 50 cm high. Water supply must be abundant, and the quality should remain fresh, with dissolved oxygen levels above 5 mg/l and water clarity over 30 cm. These conditions help maintain a healthy environment for the fish. Next, seed stocking requires careful preparation. Seven to ten days before introducing fish, the pond should be treated with 75 to 100 kg of lime per acre, followed by water filling after seven days. Aquatic plants like water lilies can be planted around the pond, but their coverage should not exceed one-quarter of the total area. Food platforms made of reeds or bamboo curtains should be placed 2 meters from the shore and 50 to 60 cm above the water. For ponds larger than 5 acres, 3 to 4 platforms are recommended. Fish selection should focus on local species that are uniform in size, with smooth skin, firm muscles, no injuries or diseases, and active behavior. Stocking density varies depending on fish size: large fish (over 50 grams each) are introduced in early winter at 4,000 to 5,000 per acre, while smaller ones (60 to 200 per kg) are stocked in June or July at 6,000 to 8,000 per acre. Feeding is another key aspect. Blackfish are carnivorous, so their diet should contain at least 40% crude protein. Two types of feed are commonly used: fresh wild fish and artificial compound feed. A typical artificial feed formula includes 48% fishmeal, 51% plant-based ingredients (like soybean meal and corn flour), and 1% additives. Feeding is done twice daily, in the morning and afternoon. Fresh fish should be cleaned, sterilized, and cut into pieces before being placed on the feeding platform. The amount fed should be 3 to 10% of the total fish weight, adjusted based on fish activity. When the fish stop eating, it’s a sign that they are full. Finally, daily management is vital. Regular inspections of the pond should be conducted in the morning and evening to monitor weather, water quality, and fish behavior. Water quality should be maintained by changing 1/3 of the water every 10 to 15 days initially, and more frequently during hot summer months—changing 1/3 every three days and 2/3 every seven to ten days. Lime and biological agents should be applied every 15 to 20 days. Daily cleaning of the feeding platforms, removal of leftover food and dead fish, and trimming overgrown aquatic plants are necessary to prevent water pollution. Lastly, ensuring the pond is secure with high fences and no leaks will prevent blackfish from escaping. By following these steps, farmers can maximize the growth and health of blackfish, leading to a successful and sustainable aquaculture operation.

Hematology Analyzer

Hematology analyzer is also called clinical blood cell analyzer, blood cell analyzer, blood cell analyzer, blood cell counter. The blood analyzer not only improves the accuracy of the experimental results, but also provides many experimental indicators, which play an important role in the diagnosis and differential diagnosis of diseases. Hematology analyzer is one of the most widely used instruments in hospital clinical testing.
Test items
Blood cell test refers to routine blood test, which is manual operation and counting under the microscope at first. It includes red blood cell, hemoglobin, white blood cell count and its classification, platelet count, etc. There are more than 20 items.
clinical significance
1. The blood analyzer is mainly used to detect various blood cell counts, white blood cell classification and hemoglobin content.
2. Hematocrit: obtained by multiplying the average volume of red blood cells by the red blood cell count.
3. Red blood cell distribution width: represents the degree of consistency of red blood cell size. When the red blood cell size is uneven, the red blood cell distribution width value increases, such as various types of nutritional deficiency anemia.
4. The three average indices of red blood cells are used to identify the type of anemia.
(1) The average hemoglobin content of red blood cells: increased in megaloblastic anemia, decreased in iron deficiency anemia, chronic blood loss anemia, uremia, chronic inflammation.
(2) Mean volume of red blood cells: increase in hemolytic anemia and megaloblastic anemia; decrease in severe iron deficiency anemia and hereditary spherocytosis.
(3) The average red blood cell hemoglobin concentration: decrease in chronic blood loss anemia, iron deficiency anemia; various diseases can be in the normal range. In megaloblastic anemia, the mean red blood cell volume increases, the mean red blood cell hemoglobin amount increases, the mean red blood cell hemoglobin concentration is normal, and the red blood cell distribution width increases.
5. Average platelet volume: the average volume of each platelet, the size of platelets is related to its function.
(1) Increased: seen in patients with idiopathic thrombocytopenic purpura, edema and proteinuria in late pregnancy.
(2) Decreased: seen in non-immune platelet destruction, aplastic anemia, thrombocytopenia repeated infection syndrome, chronic myeloid leukemia, etc.

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