Blackfish pond ecological breeding technology

Blackfish, also known as the black tilapia, is a fast-growing species with high aquaculture yield and strong resistance to diseases. It has become a popular choice for pond farming due to its adaptability and profitability. First, pond conditions: The ideal pond size 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 enclosed with bamboo fences or nylon nets, at least 50 cm in height. The water supply must be abundant, with clean water quality, dissolved oxygen levels above 5 mg/l, and water clarity exceeding 30 cm. These conditions help maintain a healthy environment for the fish. Second, seed stocking: (1) Preparation. Seven to ten days before stocking, the pond should be treated with 75–100 kg of lime per acre, and then filled with water after seven days. Aquatic plants like water lilies can be planted around the pond, but their area should not exceed one-quarter of the total pond area. Food platforms made of reeds or bamboo curtains are placed in the pond, about 2 meters from the shore and 50–60 cm above the water. For ponds larger than 5 acres, 3–4 feeding platforms are recommended. (2) Fish selection. It’s best to use locally bred fish that are uniform in size, have smooth skin, firm muscles, no injuries or diseases, and show active movement. (3) Stocking specifications, timing, and density: There are two types of fish used in blackfish ponds. Large fish, over 50 grams each, should be stocked in early winter at a rate of 4,000–5,000 per acre. Small fish, typically 60–200 per kilogram, which were raised from spring seedlings, should be stocked between June and July at 6,000–8,000 per acre. Third, feeding: (1) Blackfish feed consists of two types: fresh animal feed made from small wild fish, and artificial compound feed. As a carnivorous species, the feed must contain at least 40% crude protein. A common formula includes 48% fishmeal, 51% plant-based ingredients like soybean meal and corn flour, and 1% additives. (2) Feeding method: Feed once in the morning and again in the afternoon. Chilled fish should be soaked and sterilized before being cut into pieces. The food should be fed when its temperature matches the pond water. The daily feeding amount is 3–10% of the total fish weight, adjusted based on fish behavior and conditions. When fish stop eating, it's time to stop feeding. Fourth, daily management: (1) Regular pond inspections: Check the pond twice a day, adjusting feeding and management practices based on weather, water quality, and fish activity. (2) Water quality control: In the early stocking phase, change 1/3 of the water every 10–15 days. During hot summer months (July–September), perform small water changes every 3 days, replacing 1/3 of the water, and large changes every 7–10 days, replacing 2/3. Apply lime water and biological agents every 15–20 days, alternating between them. (3) Maintain cleanliness: Clean the feeding platform daily, remove leftover food and dead fish, and trim tall aquatic plants to prevent water pollution. (4) Prevent escape: Ensure the pond edges are high enough, seal any leaks, and regularly check and repair fencing materials like bamboo and nylon nets to prevent blackfish from escaping.

Reagent Strips For Urinalysis

Urinalysis test strips refer to test strips that test for bilirubin, urobilinogen, ketone bodies, ascorbic acid, glucose, protein (albumin), blood cells, PH, etc. in urine.
Detection principle
1. pH: The pH value in the range of 5-9 is measured by the pH indicator, and the pH value of the fresh urine of a normal person is between 5-7.
2. Nitrite: The reaction is based on the reduction of nitrate to nitrite by Gram-positive bacteria in the urine. The nitrite reacts with p-aminobenzenesulfonic acid to form diazonium compounds, which are then combined with N-(1-naphthalene) )-3 aminopropanesulfonate combined with a pink color.
3. Glucose: According to the reaction principle of glucose oxidase, glucose oxidase specifically oxidizes glucose to generate glucuronic acid and hydrogen peroxide. Under the action of hydrogen peroxide, hydrogen peroxide oxidizes the indicator and turns color. .
Classification
Urinalysis test strips are divided into visual series and machine series. The visual inspection series is divided into several models according to different inspection items; the machine inspection series is divided into several models according to different applicable instruments.
1. Classification by measurement method
1) Visual inspection series
When observing the result, compare the color with the standard color code within the time specified on the color code, judge and read the result.
2) Machine test series.
For instrument operation, refer to the instruction manual of the Urine Analyzer used.
2. According to the number of measurement items
There are single-item, 2-item, 4-item and multiple test strips. Currently, 10-item or 11-item multiple test strips are most commonly used in hospitals.
3. Classification by structure
Urinalysis test strips with single-layer membrane structure and multi-layer membrane structure.

Urine Reagent Strips,Urine Test Strip,Urine Sugar Strip Test,Visual Urine Analysis Strips

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