Preparation of fish scale glue
1. Technological process: fish scale → washing, → soaking, → soaking, → liming, → flushing, → boiling, → filtering, → solidification, → scraping, → drying → products.
two。 The technological process. After washing, the fish scales are soaked in 5% caustic soda solution for about 5 minutes to remove grease, fat skin and expand the scales. Rinse the alkali-soaked fish scales with water immediately, then soak them in clean water to remove alkalinity, until phenolphthalein does not produce red. The washed fish scales were then immersed in hydrochloric acid, and the dosage was 12% at the beginning (the volume concentration of hydrochloric acid was 31%), and then decreased gradually. The ratio of scales to water was 2 ∶ 3. After washing the fish scales soaked in acid solution, they can be soaked in 2 ~ 4 grams of lime water per liter for 7 ~ 14 days to remove other impurity, and then rinse with clean water. Add a small amount of hydrochloric acid to the washed fish scales to adjust the pH to 5: 6. The fish scales treated above were heated in a sandwich steamer at a temperature of 60 ℃ ~ 70 ℃ and heated for 2 ~ 3 hours. The boiled glue is filtered to remove impurities, the transparent and clarified glue is placed on a fixed plate to allow it to naturally condense, scraped into pieces 5 cm thick with a scraper, and the scraped pieces are dried into fish scale glue. Every 100 kg wet scale can be made into 10 kg ~ 12 kg dry glue. Its uses include photographic glue, biological glue, pharmaceutical glue and industrial glue, each of which has different quality standards.
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Processing Liquor-Soaked Crabs
Wash and drain the fresh crabs, open the navel and insert a small hole with a bamboo stick, cover the navel with pepper and salt. Prepare pickling solution: 100 kg of fresh crab, 10 kg of sugar, 10 kg of refined salt, 6 kg of ginger juice, 40 kg of soy sauce, 0.6 kg of pepper and 20 kg of yellow rice wine. Mix the above raw materials well, pour them into the pickled pottery jar, submerge the crab body, add bamboo curtain and pressing stone to keep the crab body from being exposed on the liquid, and finally seal the jar mouth. After 3-4 days, the delicious drunken products can be put on the market at any time.
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Prevention of diseases in European eel
(1) Do a good job in water disinfection, and use effective drugs and methods to kill parasites, viruses and bacteria in water: ① Sprinkle with 0.3 g/m3 (cubic meter) Yuchongqing No.2, once every 6 days. To kill parasites and eggs in water and prevent ring worm disease;② Sprinkle with 0.2g/m3 chlorine-rich whole pool once every 6 days to kill viruses and bacteria in water;③ Sprinkle with 0.3g/m3 eel net whole pool once every 6 days. Kill bacteria, fungi and protozoa in water. Note: The above three
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