Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems. Security Camera,CCTV Camera,Solar Security Camera ,4G Security Camera Shenzhen Fuvision Electronics Co., Ltd. , https://www.outdoorsolarcamera.com
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
High quality cold water in Guizhou mountain area for efficient culture of rainbow trout
Guizhou has long relied on traditional aquaculture methods, focusing mainly on the "four major fish" species and some insect pupae. High-quality fish like rainbow trout, golden shiner, and other premium varieties have traditionally been imported from other provinces, leading to limited diversity in aquatic products and higher prices for quality seafood. However, with the implementation of the western development strategy and rising income levels among farmers, Guizhou has seen a surge in the development of local aquaculture industries. In response to these opportunities, the author conducted an investigation into local water conditions and selected Jiuqu in Hequ County and Hezhang County, where high-quality underground cold water resources were identified as ideal for rainbow trout farming. The project has shown promising results.
First, the water quality was carefully analyzed. The source is groundwater, with a consistent temperature ranging between 14.5°C and 17.5°C. The pH level is 7.8, and dissolved oxygen content exceeds 5.65 mg/L. The flow rate reaches up to 1.2 m³/s, and no harmful substances such as nitrite, ammonia nitrogen, hydrogen sulfide, lead, or cadmium were detected. This meets the standards set by “GB11607-1989 Fishery Water Quality Standard†and “NY5051 Non-polluted Food Freshwater Aquaculture Water Quality,†making it suitable for aquaculture.
Second, the pond conditions were designed to optimize fish growth. Three aquaculture ponds were built side by side, each measuring 80 square meters (20m x 4m) with a depth of 1.5m and a water depth of 1.2m. The bottom and walls are made of cement, allowing for self-draining and efficient irrigation. The water flow is controlled at 0.3 m/s, with a 100-mesh filter installed at the inlet to prevent debris and wild fish from entering. A fish barrier is placed at the outlet to prevent escape.
Third, preparation work included filling the ponds with water after construction on October 20th. Each pond was disinfected using 50kg of quicklime and left to soak for one week to neutralize the cement and eliminate harmful bacteria. On October 28th, the water was drained and replaced with fresh water, ensuring that the intake used a 100-mesh filter.
Fourth, fish stocking took place on October 31st. A total of 4,000 rainbow trout and 2,000 golden shiners were purchased from Sichuan Province, with an average size of 4–5 cm. After disinfection using a 5 ppm potassium permanganate solution for 20 minutes, the fish were evenly distributed across three ponds. Golden shiners were kept in separate ponds, and nets were placed over the top of each pond to prevent fish from jumping out and birds from entering.
Fifth, feeding and daily management followed strict protocols. Feeding began on November 2nd, with three meals per day based on the "Four Sets" principle. Fish under 50g received 7–8% of their body weight in feed, while those between 50g and 200g were given 4–6%, and larger fish above 200g received about 3%. Feed amounts were adjusted based on the fish’s condition, ensuring full consumption without leftovers. Water depth was maintained at 0.8m initially, gradually increasing by 10cm every 10 days until reaching 1.2m. Regular monitoring of water quality parameters was conducted, and daily inspections were carried out to remove dead fish promptly and investigate causes of mortality.
Sixth, disease prevention measures were strictly followed. Every 20 days, disinfectants such as chlorine dioxide, salt, and potassium permanganate were applied to the entire pond, and fish were soaked to prevent diseases like gill rot and parasitic infections. Garlicin and vitamin C were added to the feed once a month to enhance immunity and prevent enteritis. All drug usage adhered to the guidelines in “NY5071 Guidelines for the Use of Non-Hazardous Food and Fishery Drugs.†Due to good water quality and proper management, no disease outbreaks occurred during the cultivation period.
Seventh, the breeding results were impressive. After 19 months of farming, by June 10, 2007, the average yield reached 2,125 kg per pond, with a survival rate of 85%. The average weight of adult fish was 1.25 kg per fish, with the largest individual weighing 1.85 kg. Sold at an average price of 40 yuan/kg, the net profit per pond was approximately 8,000 yuan.
Finally, the discussion highlights the feasibility of cold-water fish farming in Guizhou, utilizing its abundant clean cold water resources. This approach can modernize traditional aquaculture, lower market prices for premium cold-water fish, and ensure food safety. With favorable natural conditions and growing demand, Guizhou is well-positioned to develop this industry, offering a model for sustainable aquaculture expansion.