1. Considering the limitation of storage space and storage cost, as well as the fact that video recording in public places such as residential areas is a prerequisite for multi slot and a certain degree of clarity, video recording is generally deleted once a week or so. 15 days for general entertainment venues, 26 days for financial industry, and 3 months to half a year for banks, depending on the current venue regulations Doorbell Camera,360 Degree Camera, Night Vision Security Camera, Security IP Camera Shenzhen Fuvision Electronics Co., Ltd. , https://www.szsolarcamera.com
I. Cultivating large-scale fish species Breeding large, well-designed fish species is an important measure to ensure safe wintering of fish species. In general areas from June to September each year is the season when the water temperature is high and fish feeds grow most vigorously. Intensive feeding measures are adopted to enable the fish seedlings to grow vigorously and plumply. The specifications are as large as 15 cm or more. To reduce the stocking of summer fish species, it is recommended to stock 4000 to 6000 tails per acre. In terms of species mix, 30% to 50% of grass carp is used to cultivate ponds of pupa and carp, and 30% of carp and carp are also used to ponds of grass carp. If you use turf and carp alone, Luofei (Aza) fish is dominated by 30% of carp and carp seedlings (carp and carp are mainly plankton in filter ponds and control water quality). To strengthen the management of feeding in the fall, feed more feeds containing fat and protein, improve the fish's plumpness, actively cultivate fertile and strong fish, and enhance the cold-resistance of fish.
Second, select the wintering pool over the winter pool should choose the water retention performance, do not leak infiltration, flat bottom, silt 15 cm -20 cm, an area of ​​2 acres - 5 acres is appropriate, leeward sunny, water depth of 2 meters -3 meters is good . During the winter, it is best to have a source of water suitable for wintering fish requirements. When needed, it can be used to replenish new water in a timely manner and discharge old water. Sewage wastewater can never be poured into fish ponds. Before the fish species fall into the pond, they must first use clear lime and bleaching powder to thoroughly disinfect the pond in order to achieve improved water quality and prevent disease.
Third, it is not too early and not too late. Too early because of the high temperature, when catching the nets, the fish species activities are intense, which can easily cause fish body trauma. Too late, the temperature is too low, and the fish species can be easily frostbite. When the pond is to be selected, it should be sunny and windless, and the water temperature should be at or below 10°C. It should be noted that fish species in the pond must be stocked with the same species and specifications, and should not be mixed together. The density of stocking should not be too large. The water depth per mu of still water should not exceed 150 kilograms, and the depth of 2 meters should not exceed 250 kilograms. The fish seedlings incorporated into the wintering ponds are first soaked with 3% saline and 3% aqueous sodium bicarbonate solution for 5 minutes to 10 minutes, which can effectively prevent the occurrence of fish diseases such as hydromycosis.
Fourth, after rational training of water quality fish species and ponds, pay attention to observe whether the water quality is reasonable. If the water quality is too thin, plankton is not abundant, and a filter food that affects the puffer fish species will affect growth. Second, the amount of phytoplankton will affect the photosynthesis, resulting in less dissolved oxygen in the water and affecting the growth of the fish. At this time, 1 kg of urea per mu and 2 kg of phosphate fertilizer can be mixed and splashed after dissolution to facilitate the growth of plankton. Conversely, if the water quality is too fat, an odor will be smelled, and plankton will be excessive, causing excessive oxygen consumption at night. As a result of the lack of oxygen, the floating head of the fish may become sick or die. At this time, 1ppm-2ppm trichlorfon water is used to splash the whole pool. In order to kill excessive plankton, the color returned to normal.
V. Strengthening Management During the wintering season of fingerlings and adult fish, special management should be carried out for special persons. Regular inspections of overwintering conditions should be conducted to identify problems and resolve them in a timely manner.
2. The length of the storage time of the monitoring video is generally related to the following points: the capacity of the host's hard disk. Generally, a camera needs about 0.3G-0.5G of hard disk capacity for 24 hours of continuous video recording. Different systems have different parameters, the minimum is 0.15G/24 hours;
3. The number of cameras. The more cameras, the more capacity required. Also, the selection of the resolution and picture quality of the recorded picture will also affect the capacity required for video storage;
4. The video recording mode will also affect the space required for storage. The video recording mode is generally divided into [Mobile Video Recording] and [Continuous Video Recording]. The former means that the host starts to record when a moving object passes through the monitoring range, and does not record at other times. This can reduce the storage space required for video recording; On the contrary, continuous video recording is 24-hour continuous video recording.
The quality of tropical fish seedlings and unlisted adult fishes is related to the production of adult fish production in the coming year, which is related to the increase of production and income in the early morning market season. We should carefully examine the implementation and take proactive measures to improve the overwintering effect of fish. Its main wintering measures are as follows: