The appearance of prawns
Shrimp is long and flat, left and right, and its body is divided into head, chest and abdomen. Adult female shrimps are bigger than male shrimps and have different body colors: female shrimps are gray-blue while male shrimps are yellow. Shrimp is covered with a skeleton shell secreted by epidermal cells.
The front of the shrimp body is the head and chest, which are thick and short and the division is not obvious. It has a hard head and breastplate covering the back and sides of the head and chest, and a straight, slender and sharp front corner in the center of the front end, which has the function of protecting eyes and defending enemies.
Shrimp belly is long, muscular and obviously divided. It gradually becomes thinner from front to back, and the back and both sides of each abdominal segment are covered with relatively hard carapace. The green back of the first section is covered on the back section, and the shell at the joint is thin and soft, which is folded back and forth to facilitate the activities of the section.
Shrimp mainly feeds on invertebrates such as polychaetes, small crustaceans and bivalve mollusks, and sometimes preys on zooplankton. Living in the muddy sea area along the estuary, it has strong adaptability to the environment, can survive below 10℃ and above 30℃, and often moves and migrates on a large scale.
Shrimp should not be eaten with some fruits. Shrimp is rich in nutrients such as protein and calcium. If you eat with fruits containing tannic acid such as grapes, pomegranate, hawthorn and persimmon, not only will the nutritional value of protein decrease, but tannic acid will combine with calcium ions to form insoluble conjugates, which will stimulate the gastrointestinal tract and cause discomfort, vomiting, dizziness, nausea, abdominal pain and diarrhea. Seafood should be eaten with these fruits at least 2 hours apart. In addition, seafood and vitamin C should not be eaten together.
Shrimp culture
The selection of shrimp fry is one of the keys to the success or failure of shrimp culture. Therefore, it is necessary to choose healthy seedlings that have been tested and are free of viruses and harmful bacteria. The following provides an intuitive selection method for reference: Penaeus monodon (Macrobrachium nipponense and Macrobrachium nipponense) fry: it must be above 65438±0cm, with uniform individual size, clean body surface, normal body color, no attachments, lively swimming, countercurrent swimming, straight shrimp body, eyes open when swimming, eyes and tail leaves open for a while when not swimming. It is best to set up a feed observation platform in the east, west, north and south of each shrimp pond. The setting of feed table is beneficial to observe the feeding situation of prawns and the amount of feed put in. By observing the feed table, we can know and master the stomach fullness of prawns, the amount of feed, the distribution of prawn feces and prawns, thus determining the increase or decrease of feed and the dosage of a certain part in the next meal. The matching of the aerator is generally per mu 1 horse. If the seedling density exceeds 60,000 plants, each acre should be equipped with more than 1 aerator. The aerator is best equipped with impeller, submersible and nanotube, and the effect is better. Adding an aerator can not only prevent prawns from floating due to lack of oxygen, but also improve the water environment and activate water condition factors.
One thing has many values.
Shrimp is nutritious, soft and easy to digest, and it is a good food for people who are weak and need to be nursed back to health after illness. Shrimp is rich in magnesium, which plays an important role in regulating heart activity and protecting cardiovascular system. It can reduce the content of cholesterol in blood, prevent arteriosclerosis, dilate coronary artery and help to prevent hypertension and myocardial infarction. Shrimp is rich in phosphorus and calcium, especially suitable for children and pregnant women. Astaxanthin is a very important substance in shrimp, and its surface is red. Astaxanthin is the strongest antioxidant found so far. The darker the color, the higher the astaxanthin content. Widely used in cosmetics, food additives and medicines. Scientists at Osaka University in Japan have recently discovered that astaxanthin in shrimp helps to eliminate the "jet lag" caused by jet lag.