According to the law of growth and reproduction of whitebait, taking into consideration the requirements of export specifications, the body of silverfish is more than 5.5cm long, and it can be caught in mid-September. The length of silverfish is 8.5 to 15cm. It was arrested early in October. Third, the reservoir of whitebait fishing techniques (a) silverfish pull net is a low network, wingless cystic fishing gear. Suitable for water depth of 5 meters, the bottom flat, with a gentle slope of the shore operation, 5 to 8 people operation. The net is of the long-belt type. During the operation, the fish are surrounded, and the manpower is used to wrap the skarn on the shore and the encirclement is reduced. The whitebait is caught in the center of the net and captured. Other fish in the library were frightened by the high speed of the game. Most of the fish escaped. Therefore, more than 95% of the fish caught on the fence were silverfish. General production 15 to 30 kilograms, up to 140 kilograms. This net is 100 meters long and 5 to 8 meters high. The net is sewn with polyethylene net cloth (or window screening). The upper and lower sections each shrink 3% to 5%. The upper section adds the float and the lower section uses brown. Rope or hemp rope for sinking. (b) Silverfish gill nets Silver gill nets are mainly used for catching whitebait in small batches. The nets are long and band-shaped, and a number of nets are connected in a row when operating. They are submerged in the waters where silverfish often inhabit. They rely on the role of floating sinkers to open vertically, allowing the silverfish to lay a mesh and achieve the purpose of fishing. Each net produces 3 to 5 kg. The mesh is made of 0.13 to 0.15 mm diameter plastic yarn (nylon glue thread) and weaving. Each piece is 40 meters long and 1 to 1.5 meters high. One fishing boat was used, and two operators were used to gill net several pieces. 1 person rowing, 1 person under the net. Connect the sinker rope and buoy rope first and throw the gill net into the water. The time interval from the start of the next network can be controlled flexibly. When the network is started, the net is taken from one end, and the nets are taken out in order to pick up the catches, clean the net gear, and prepare for the next operation. 4. Fresh-keeping processing of whitebait (I) Acquisition of whitebait When fishermen catch silverfish during the flood season, the acquisition of fishing boats must promptly organize an on-site purchase and put the whitebait in a pre-prepared plastic box. The specifications of the box are length, width and height (654030 cm). Each box can contain about 12.5 kilograms of whitebait. The box is filled with a layer of fish and sealed with ice. The weight ratio of fish to ice is 1:1. After receiving a certain quantity, they must be shipped back to the shore and sent to the processing plant. If the fish can be sent to the cold storage within 2 to 3 hours, it is not necessary to add ice. (II) Preservation and processing of whitebait will preserve the acquired fish. The basic processing techniques are: cleaning → cleaning → sorting → weighing → bagging → loading → quick-freezing preservation → packing for sale into a refrigerator. 1. Cleaning, cleaning and sorting: Disperse the whitebait in each wash basin, wash silver fish below 15°C, and use webcam (like badminton racket) to detect the whitebait from the pot, according to export requirements It is divided into 3 to 5 cm/tail, 8 to 10 cm/tail, 10 to 12 cm/tail, and various specifications. 2. Weighing and bagging: The cleaned silver fish is sent to the packing workshop and first soaked in clean ice water for 1 to 3 minutes, and then the fish is removed and the water is drained and weighed. The number of fish per bag when exported is about 1035 grams. The actual amount of fish loaded depends on the freshness of the fish. It is important to ensure that the net weight of the thawed fish after the bag is frozen is 970 to 1000 grams (because the fish After quick-freezing, the body's moisture content is frozen, and the body weight is reduced after thawing. Therefore, the weight of the fish is more when bagging). When the individual freshness of the fish is good, it can be less loaded, and when the individual is small or when the freshness is poor, it can be installed more. In recent years, the sale of whitebait in the domestic market has increased, and there are also 1kg in 3 bags and added with appropriate amount of water and frozen to supply the domestic market. Before the silverfish is put into the plastic bag, it is also necessary to check the tiny impurities with tweezers. 3. Quick-freezing and fresh-keeping: The plastic bag is first put into a special shaped carton, or it is put into a specially-made grid-shaped stereotyped iron box, and then it is loaded with about 1 kilogram of whitebait. The final batch enters the quick-freeze cold storage establishment, the temperature of the quick-freezing warehouse reaches -28 °C. 8 to 10 hours after the completion of quick freezing, so that the center temperature of each of the whitebait reaches -15°C. If the storage temperature does not reach -28°C and the freezing time is too long, it may cause excessive loss of water and black color of the whitebait, affecting the quality of the production and affecting sales. 4. Packing and preservation: The frozen fish is put into a large carton and transferred to a cold storage for sale. (3) The processing technology of dried whitebait will remove the fish caught from other fish, shrimps, and other sundries, and then directly expose it to sunlight, then dry it and put it into storage for sale.