I. Fish Pond: A cement pond with dimensions of 9.5 meters, 9.8 meters, and 1.5 meters was used as a test tank. The setup included oxygenation equipment and shade nets to maintain optimal conditions for stingray cultivation. Although the gravity drainage system was not fully integrated, the pond still proved suitable for aquaculture.
II. Fingerlings Purchase: A total of 3,000 stingray fingerlings were purchased, with a density of 140 tails per kilogram. The average body length was 6.8 cm, and the average weight was 7.27 grams. All fish were uniform in size and showed strong vitality, with an average stocking density of 32.2 tails per square meter. Before stocking, the fish were disinfected using a 3% saline solution for 5 to 10 minutes, while closely monitoring their response to ensure no adverse effects.
III. Feeding and Management: Based on the feeding habits and activity patterns of stingrays, they were fed twice daily—once in the morning and once in the evening. The feed used was a compound feed with a crude protein content of 38% to 40%. Hand-feeding was practiced, with each feeding session lasting approximately 20 minutes. The daily feeding amount was determined using a theoretical feeding rate table, and adjustments were made based on the fish's behavior and water temperature changes.
Throughout the rearing period, daily observations were conducted in the morning and evening to monitor the stingrays' activity and feeding behavior. Water temperature was measured every day, and water changes were carried out according to the water quality. Regular measurements of body length and weight were also taken to track growth progress.
When the water temperature reached 20°C or higher, disinfection was performed weekly using a 0.310% solution of bromochlorohydantoin (negative 60%). During the entire cultivation period, only a few fish died due to stress from long-distance transportation during the initial phase. No significant mortality was observed in the middle and late stages, resulting in a final survival rate of 98%.
IV. Results: After 185 days of rearing, the stingray output reached 229.6 kg, totaling 2,943 tails, with an average weight of 78 grams per fish. This translated to 2.47 kg per square meter, equivalent to 1,642 kg per mu. The feed conversion ratio was 1.54, and the survival rate remained at 98%.
V. Benefit Analysis: After deducting all costs, and considering the current wholesale price of stingrays, the profit per mu was calculated to be 10,338 yuan.
VI. Summary: Stingray farming is one of the most efficient species currently being cultivated in freshwater systems. Using cement tanks for stingray cultivation offers several advantages. First, it allows for intensive farming with small water volumes, high stocking densities, and high yields per unit area. Second, water quality is easier to manage, making disease prevention and control more effective. Third, the system is high-input and high-output, with an average investment of 58.5 yuan per square meter and an output of 74 yuan, resulting in an input-output ratio of 1:1.26 and a high return on investment. Lastly, stingray farming is relatively easy to manage, making it ideal for promotion in regions with suitable conditions. If self-drainage can be implemented, the overall production could significantly increase.
Diagnostic reagents can be divided into two categories: in vivo diagnostic reagents and in vitro diagnostic reagents. It is mostly a reagent for detection by the reaction between antigen and antibody.
A: Classification of in vitro diagnostic reagents:
1. In vitro biodiagnostic reagents managed as drugs include:
1. Blood type and tissue type reagents;
2. Microbial antigen, antibody and nucleic acid detection reagents;
3. Tumor marker reagents;
4. Immunohistochemistry and human tissue cell reagents;
5. Human genetic testing reagents;
6. Biochips;
7. Allergy diagnostic reagents.
2. In vitro reagents managed as medical devices include:
1. Clinical basic test reagents;
2. Clinical chemistry reagents;
3. Blood gas and electrolyte determination reagents;
4. Vitamin determination reagents;
5. Cell histochemical stains;
6. Autoimmune diagnostic reagents;
7. Microbiological test reagents.
B: According to medical test items, clinical diagnostic reagents can be roughly divided into clinical chemical test reagents, immunology and
Serological testing reagents, hematological and cytogenetic testing reagents, microbiological testing reagents, body fluid excretion
Detection reagents, genetic diagnosis reagents, etc. Among them, the market share of clinical chemistry
The largest, close to 34%; followed by the immunology market, accounting for about 29%. Novel immunodiagnostic reagents and genetic diagnostic tests
The reagent was developed in the late 1980s, and it is the most common diagnostic reagent for all current diagnostic reagents, regardless of technology or market.
The fastest growing product.
Urine Rapid Test Kit,Rapid Test Kit 6-Panel,Toxoplasma rapid test kits,Fecal Occult Blood Test
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