How to identify the quality of shrimp

There are many kinds of ● shrimp, the same kind of shrimp also has different grades of products, its quality requirements are very different, there is not a unified standard to judge the quality.

● determines the quality of shrimp feed, and finally depends on the breeding effect. However, the culture effect depends not only on the quality of feed, but also on the germplasm and health status, water quality, stocking density and very important feeding management of shrimp.

● should point out that the shrimp processed by advanced extruder has a dark surface color due to processing technology (black fades quickly and becomes grayish brown after immersion in water), the smell is light, and the food attraction decreases, but the culture effect is not inferior to that of pellet shrimp, and has the advantages of killing all pathogens, good physical properties and high digestibility.

There are many kinds of shrimp, the same kind of shrimp also has different grades of products, its quality requirements are very different, there is not a unified standard to judge the quality. For example, Japanese shrimp, Chinese shrimp, and spot shrimp require a large amount of fish meal and high protein and fat content, while Macrobrachium rosenbergii and green shrimp feed can use more plant raw materials, and the protein content requirements are not too high. South American shrimp feed is somewhere in between.

To judge the quality of shrimp feed, it finally depends on the breeding effect. However, the culture effect depends not only on the quality of feed, but also on the germplasm and health status, water quality, stocking density and very important feeding management of shrimp. The shrimp raised with good quality shrimp has the advantages of rapid growth, strong disease resistance, low feed coefficient, bright and transparent color and full meat. For example: good South American white shrimp feed, under normal circumstances, raising South American white shrimp is about 80 days can be developed into commercial shrimp (specifications 35-45 / jin) out of the pond for sale, with a feed coefficient of 0.9-1.1.

How to distinguish the quality of shrimp?

First, look at the main nutritional indicators. Among them, the contents of crude protein, crude fat, lysine, methionine, arginine, available phosphorus (phosphorus that shrimp can digest and absorb), crude fiber and ash are very important. Most of these indicators are marked on the label, generally credible, a small number of them are not marked, and it is impossible for users to send samples for testing. As for the very important vitamins and trace elements, the content is not marked. It should be pointed out here that some users only look at the crude protein content and think that the material with high protein content is good material, which is a misunderstanding. Like fish, the protein content of shrimp is not as high as possible. The high content of protein and fat will affect the growth of fish and shrimp. Raising fish and shrimp with such materials will not only increase the culture cost, but also affect the growth of fish and shrimp.

Second, look at the selected raw materials. Nutritional indicators only reflect its quantity, not its quality, which is very important. For example, with 40 proteins, fish meal protein and soybean meal protein are different, and soybean meal protein is also different from cottonseed meal and rapeseed meal protein. The main raw materials used in shrimp meal should be fish meal, soybean meal, peanut meal, corn meal, corn gluten meal, high gluten flour, fish oil, phospholipid and so on. The name of the main raw material is generally indicated on the label, but there is no very important proportion.

Third, the simple discrimination of quality. Talk about a few points for users' reference.

1. Color. The good shrimp is light grayish brown, consistent in color and oily. However, the color is affected by the color of the raw materials, there will be changes in depth, can not be regarded as the main quality factor.

2. Smell. Good shrimp should have a fragrant smell of fishmeal, shrimp or squid. If the seal is opened for a long time, you can't smell the pungent smell, nor can you have the smell of oil oxidation. Clear but not turbid, indicating that the use of fishmeal is better, thick and turbid fishmeal flavor, indicating that the use of fishmeal, fish oil is more but poor quality.

3. Appearance requirements. The surface of shrimp meal is smooth, the fracture surface is smooth, the length is relatively consistent, and the particles are uniform.

4. Crushing fineness. Crush the shrimp with a glass bottle and observe the crushing fineness. Good shrimp is crushed finely without any obvious large particles.

5. Water resistance and softening time. Soak the shrimp material in water. After 2-3 hours, the shrimp material expands without dispersing, without sewing, without breaking, and without blooming at both ends. After soaking in water for 30 minutes and 40 minutes, it softens completely, the shrimp material is not hard, and the flat shrimp material is not scattered.

6. Simple biological experiment. Put the soaked and softened shrimp in a place where ants and flies are easy to go. Good shrimp, ants and flies are to be eaten. If the softened shrimp is placed on the ant's passage and the ant does not want to go near it and make a detour, the shrimp is not very good.

7. Food inducement. A small amount of shrimp was sunk into the shrimp pond with a self-made small net, and about half an hour later, the small net was raised to the surface of the water to observe how much shrimp was left in the net and how much shrimp was in the net to determine its food attraction. Generally speaking, good shrimp food is better to attract food. However, we can not judge the quality of shrimp feed only according to the feeding inducement. Because although the inherent quality of some shrimp is not very good, but more food-inducing substances are added, shrimp will like to eat very much, and the culture effect is not as good; some shrimp materials are of good internal quality, but they do not add food-inducing substances or add less, although shrimp is not very fond of eating, but the culture effect is very good. To be sure, good shrimp food, shrimp will not have feeding disorders, used to be able to eat normally.

It should be pointed out that the shrimp processed by an advanced extruder has a dark surface color due to processing technology (black will fade quickly and become grayish brown after immersion in water), the smell is light, and the food attraction decreases, but the culture effect is not inferior to that of granular shrimp, and has the advantages of killing all pathogens, good physical properties and high digestibility.

Fourth, select manufacturers and brand products. Shrimp feed belongs to high-grade feed, which has high requirements for formula, raw materials, processing and quality. The regular operation of large companies and famous brand manufacturers have relatively strong technical force, strict formula management, fine selection of raw materials, advanced production equipment, and standardized production process management and product quality management. its product quality is more reliable and stable.

Of course, I do not exclude small factories and miscellaneous brand products, this kind of products may also have good quality shrimp. But for users, the brand products produced by large factories are more credible and reliable.