At present, the use of compound feeds is becoming increasingly popular in aquaculture. Farmers choose feeds with better "cost-effectiveness" and become an important factor in obtaining the best aquaculture benefits. However, some non-professional manufacturers and small workshops have been driven by profits. They have been engaged in the production and processing of fish feeds and dumped at low prices. The end result is low user efficiency and some serious losses. The following is a brief introduction to the simple identification method for fish feed quality.

1. Color: There are many types of feed for fish and it is difficult to judge from the color. The products of professional fish feed manufacturers are generally made of protein materials such as fish meal, soybean meal, rapeseed meal, cotton seed meal, etc. Therefore, they have the properties of their raw materials from the appearance of the product, and generally have a dark brown or brown color. However, the products produced by the same manufacturer, the same variety, or at different times may have slightly different appearance colors due to different sources of raw materials.

2. Smell: Fish feeds produced by professional manufacturers generally have vegetable scent and fishy flavor, and a few manufacturers add anti-microbial drugs--garlicin and garlic flavor. However, some manufacturers have taken measures to add flavoring agents such as fish paste and fish flavor to show that their products contain large quantities of fishmeal. Such products generally have a rich fishy smell. If they are soaked in water for a period of time, the fishy smell will be reduced or disappeared.

3. Water resistance: Some fish farmers always hope that the water resistance of fish feed will be as long as possible. They believe that only when the water resistance time is long can the feed waste be reduced. In fact, this understanding is one-sided. Our common fish such as herring, grass carp, clams, cockroaches, and clams are all fish of the carp family. They do not have stomachs and require regular feeding. After domestication, the food intake is intense, and as long as the number of feedings is increased, the purpose of not wasting the feed can be achieved. The feed water resistance is generally 3-6 minutes.

4, Specifications: Regular professional manufacturers generally in accordance with the characteristics of the growth period of fish, respectively, timely launch of powder, small broken, large crushing and other products, and effective product tracking services. The product of the same specification is uniform, the surface is glossy and bright, and the section incision is smooth. The particle length is generally 1.5-2.5 times of the particle size. The common low-quality fish feeds on the market have the characteristics of rough surface, single size, uneven profile and different lengths. If the ratio of the length and the particle size of the fish feed is out of balance, the palatability of the fish to the food will be seriously affected and the feed loss will be caused.

5, smash fineness: the digestion and absorption of food by fish is in the intestine, by the peristaltic movement of the intestine, digestion and absorption in the role of digestive enzymes, the general emptying time is 1.5-2 hours. This requires that the finer the food particle size, the better, and the finer it is, the higher the utilization rate. In the market products, high-quality feeds have characteristics such as fine grain size and uniform composition; while some enterprises with obsolete equipment are restricted by the production process or some small workshops compress production costs, etc., they often do not pay enough attention to the fineness of smashing in their products. The granular composition can be seen in the appearance.

6, sand content: In order to reduce the product's competitive price in the market, constantly seeking product profits, a few companies often add some sand in the product. In this regard, farmers can sample randomly and adopt oral taste methods. If there is a feeling of tooth decay or a muddy taste, it is proved to contain sand. Second, a small amount of sample can be placed in a transparent glass, soak the sample with water until all dispersed, and stir for several times, standing for observation, if the upper layer appears turbid, the bottom of the cup has fine sand, indicating the presence of sand, and can be seen fine Sand content.

Judging the quality of a feed quality should be considered from the aspects of appearance quality and internal nutrition; it should be evaluated from the scale of the enterprise, equipment, technology, manpower and other conditions. However, as aquaculture farmers, the most direct and primitive identification of fish feed quality is mostly sensory. Only by selecting high-quality and high-efficiency products can we obtain better economic benefits.

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