Set-up of cages: Quick-raising of grass carp cages should include reservoirs, lakes, river dams, and large ponds. Net cages for grass carp should be set at depths of more than 3 meters in open areas of reservoirs, deep-water lakes, and gentle rivers, with pH values ​​of 6.5-8.5 and water temperatures at 20-30°C. Dissolved oxygen above 4mg/L, the size of the cage is suitable for 25-30 square meters. Must not exceed 30 square meters. The four sides of the cage should be fixed on the bamboo frame, and the bottom four sides of the cage should be suspended by two bricks or stones. The cage is opened up and down into four squares, the cover is exposed to the water surface of 25 cm, multi-tank breeding, the cage erection should be left and right staggered in a line, both sides of the cage in the middle with a polyethylene rope, box left and right sides to maintain a box ( For a distance of 5-6 meters), the distance between cages is kept at 30 meters or so, and it is more than 10 meters offshore to prevent rats and snakes from harm.
Feeding of fish species: The fish species required for fast-breeding in grass carp cages are required to have robust physique and the specifications are the same. The fish species in the box are required to be about 0.25 kg. The grass carp is the main species, and small amounts of oysters, clams, squids etc. . The box should be set and sterilized one week before the release of the fish, so that the algae can become smooth and the fish will not be damaged. Each cage should be equipped with 800-1000 large species of fish, with 10-20 fishes such as oysters, oysters, clams, and oysters. The fish should be soaked with 3% salt water for 10 minutes before the fish is put to disinfect the fish. The place should be injected with a grass carp hemorrhagic vaccine.
Feeding methods: Grass carp is mainly herbivorous and should be fed with ryegrass, Sudan grass, Russian feed vegetables. However, it can also feed some granule compound feeds. The content of protein in compound feed is about 15-20%. Its formula is: fishmeal 8%, bean cake 16%, vegetable cake 15%, wheat bran 30%, secondary powder 10% , rice bran 18%, premix 3%. You can also feed cooked sweet potato mixed rice bran or wheat bran. Feeding of green feed must be done with enough feeding; regular feeding, usually every morning (9-10 pm) in the afternoon (3-4 pm), it is best to ask the green feed put in the box every day for grass carp to eat. About 15-20 hours, the amount of daily feeding should be based on the maximum amount of fish on the day of eating. But must not eat the same day, leaving a lot of residual bait. The fodder to be fed should be fresh, and the next day's, especially the yellow, rotten and spoiled fodder can not be fed, otherwise it is easy to get sick. Before feeding, first remove the bait that has not been eaten since the last feeding in the cage. When there is no shortage of green or green material, feed concentrates such as barley, wheat, rice, and bean cakes should be fed. When feeding grain materials such as barley and rice, it is necessary to bubbling with water before feeding.
Feeding and management: When the fish is thrown in the box, check whether the cage is damaged. Prevent fish species from fleeing. Adhere to the morning and night inspections, if the weather is bad, it should be based on the appetite and activities of the fish to stop or less feeding amount, the leftover grass can not be eaten in a timely manner, feed should be fresh and tender. Do a daily job record and establish a technical file.
Network Camera NVR CCTV Kits
The functional mode of NVR technology application is relatively flexible and can meet the functional requirements of today's video monitoring system to a large extent. The small NVR scheme with NVR technology as the core has the advantages of small scale, flexible operation, convenient use, economy and practicality. Its front end mainly supports 8-way 720P high-definition video image access with high-definition video camera, and then realizes the centralized management and real-time storage of high-definition video image information through NVR technology. In addition, this small NVR scheme can also support remote management of video images, preview analysis of video images, real-time upload of gigabit network interface video image data, local preview, video playback and other functions. The small NVR high-definition video scheme has a high overall cost performance ratio, simple system and high operational flexibility. This small NVR high-definition video monitoring system is widely used in the centralized video monitoring field in small areas such as companies, factories, family villas, offices, shops, supermarkets, etc.
With the further increase of functional requirements for high-definition video monitoring system, the video monitoring system is required to have the technical performance of expansion, cascade and standard ONVIF communication protocol. The HD cameras of different manufacturers and brands at the front end of the video monitoring system can be organically interconnected through NVR equipment. In this way, a unified functional integrated LAN can be built through NVR to achieve NVR cascade, expansion and mass storage in the video monitoring system. In addition, a centralized advanced application management technology platform is built at the back end through NVR expansion, which can uniformly manage and configure the NVR device group to achieve multi-user forwarding and various application function services (forwarding/management server group) within the region, mainly including: forwarding server, management server, storage database, on-demand server, advanced client application software and other functional modules. The medium-sized NVR high-definition video system is usually used in the medium-sized high-definition video surveillance projects with routes below 1000. Its advantages are that NVR can achieve distributed layout and centralized and unified storage, and its operation stability is high. The back-end technology platform carries out unified management and application, and can achieve multi-user and multi-level integrated and unified application services. The secondary medium-sized network mainly focuses on the urban video monitoring architecture of district, county or prefecture level cities. It realizes the storage of video image data and the centralized communication management of access to front-end equipment through NVR, thus realizing the storage, management, client video image preview, local decoding on the wall and other service application functions of front-end high-definition camera video. At the same time, it can also be authorized by the provincial video monitoring center, The video image information can be previewed, controlled and shared among clients of different levels of users, fully meeting the normal video monitoring function requirements of secondary users in cities such as prefectures, counties and cities.NVR technology has been widely promoted and applied in urban safe storage, national security and other engineering projects with its own advantages in many aspects. Driven by market and technology, NVR technology will become the mainstream technology in the field of urban security high-definition video surveillance, with very strong theoretical research and practical application prospects
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