There are many kinds of hatching facilities for fry. Traditional incubation facilities mainly include incubation barrels (tanks), incubation rings, incubation tanks, etc., as well as new incubation facilities such as rectangular incubation devices and small glass fiber reinforced plastic incubation rings. In recent years, there has been a modern full-manual controlled incubation mode, which realizes anti-season breeding and production through recycling and controlling the use of water. Fish fry incubation facilities generally require smooth walls, no dead ends, and no accumulation of fish eggs and fry. (1) Incubators are generally made of tinplate, which consists of a barrel body, a barrel cover and accessories. The hatching barrel is generally 1 m high, with an upper opening diameter of 60 cm and a lower opening diameter of 45 cm, and the barrel body is slightly conical. The barrel cover is generally made of steel bars or bamboo strips, and the yarn cover is made of 60 mesh nylon gauze. The lid of the barrel is 25 cm high. The accessories of incubator generally include wooden frame, iron frame, rubber tube and switch to control water flow. (2) The incubator is used in the case of small-scale seedling raising. Generally, it is made of ordinary water tank, which requires cylindrical shape and smooth inner wall. Incubation tanks are divided into bottom water inlet incubation tanks and middle water inlet incubation tanks. Is the hatch cover generally 15 high? 20 cm, the water capacity is about 200 liters. Incubators generally put 65438+ 10,000 eggs per 100 liter of water. (3) Incubation ring is a large-scale incubation facility set indoors or outdoors and incubated with circulating water. Incubation rings have two shapes: round and oval, which can be divided into single ring, double ring and multi-ring according to the number of rings. Oval hatching ring is widely used in aquaculture because of its small centrifugal force and few dead angles on the inner wall. Incubation loop generally adopts cement brick structure, which consists of water storage, filter pool, loop, filter window, water inlet pipeline and drainage pipeline. The storage box of the grid culture loop can be combined with the filter box. When external water enters the water storage tank, it is generally installed with 60? 70 mesh nylon screen wire or copper mesh filter screen. The filter is generally a fast filter structure, and the area and structure of the fast filter are configured according to the water quality of the source water. The water outlet of the incubation loop is generally duck-billed sprinkler structure. The drainage pipeline of the incubation loop directly discharges the spilled water to the external environment or water treatment facilities, and then recycles it after treatment. Emergency pipes are generally used in conjunction with drainage pipes and have a certain slope to facilitate drainage. Generally, filters use 0. Vinyl or nylon mesh with a diameter of 5 mm and a height of 25? 30 cm, vertically assembled, slightly tilted outward. The width of the ring is generally 80 cm. (4) Rectangular incubator is used for incubating sticky eggs and heavy eggs with large egg diameters. Rectangular hatcheries generally adopt FRP or brick structure, and the specification is 2. 0m x0.8m x0.6m and 4. 0 m x0.8m x0.6m .. (5) The small glass fiber reinforced plastic hatching ring is a facility mainly used for incubating sinking and semi-sinking eggs after deboning. This is a culture ring of FRP tank. The effective diameter 1.4m, height 1.0m, and the water body is about 0.8m3 The upper part is drained by overflow, and the bottom nozzle is filled with water. It is structurally characterized in that the bottom of the circular road is circular, the middle is a cone protruding upwards, the top is provided with a water inlet pipe, and the frustum-shaped water filtering net is arranged inside the pool wall at the upper part of the circular pool.