Choice of shape types
Which type of feed to choose depends on the characteristics of the breeding object, such as feeding habits and feeding methods.
 
The powder material is suitable for feeding water flowers and small fry, and the eating habits of unique species are different. For example, the small fry of domestic fish can only eat powdered and granular objects; and the eel material is also powdery. The feeding of eels is now developing in the direction of domesticating puffed pellets.
 
At present, most fish feeds are pellets, which are better than powders and are suitable for feeding in water. The nutrient loss in water is less than that of powders, and the pollution of water quality is reduced at the same time. When selecting pellets, it should be noted that the size of the particle size is consistent with the size of the mouth crack of the breeding object, so as to facilitate the normal feeding and swallowing of the breeding object.
 
Choice of particle size
 
The particle size of fish feed is generally between 0.5-8.0 mm, and the particle size is basically two-thirds of the longitudinal length of the mouth crack of aquatic fish. If the longitudinal length of the mouth opening of the breeding object is 9 mm, then it is suitable for feeding a feed with a particle size of 6 mm, which will neither cause waste nor affect feeding. If the particle size is too large, it is inconvenient for the fish to swallow, but if the particle size is too small, it is unpalatable and consumes more energy of the fish body, so it must pay attention to palatability.
 
The particle size of aquatic feed is from powder, crushed, 0.5, 1.0-8.0 mm, etc., and they are fed with aquatic products with different mouth openings. Generally, the particle size of adult fish is 2.0-4.0; juvenile fish use powder and open crushed material, and small fry use 1.0 particle size material.
 
The choice of color
 
Generally, the better feed has a bright luster and consistent color. This sensory index reflects that the crushing power of the feed is better, the processing technology is reasonable, and the fineness of the feed raw materials is higher for compound feeds. It is beneficial to the digestion and absorption of fish and shrimp, which is different from livestock and poultry feed. If the color of the feed is blue and inconsistent, most of this feed will be mildewed or deteriorated, especially in humid weather, it is easy to mold and cannot be purchased.
 
In addition, the feed that is glued together cannot be purchased. Because of the processing technology such as formula ingredients, humidity and mixing, some nutrients may change after the feed is glued, which is not conducive to the feeding of fish. Therefore, this type of feed is also not suitable. Buy.
 
The choice of smell
 
All kinds of feed ingredients have specific smell and taste. For example, good fish feed generally has a normal fishy smell due to the use of fish meal, which is pleasant to smell. If it is a poor feed, the fishy smell is less or not because of the use of some fishmeal substitutes.
 
In addition, bad feed may have a musty smell or "smell", which indicates that the fat in the feed has been oxidized, and it is not possible to choose the feed that is mildewed or deteriorated. Once this feed is fed, it may cause a large number of fish deaths, and Pollution of water quality, this kind of feed should not be used.
 
The choice of stability in water
 
Fish feed is fed in water, which is different from livestock and poultry feed. The feed is required to be stable for a certain period of time in water to prevent nutrients from dissolving in water, which is conducive to centralized feeding of fish, improves feed efficiency, and reduces feed costs. Prevent water quality deterioration.
 
For this reason, when purchasing, you can take some feed and soak it in water for a period of time to see how stable it is in water. When buying aquatic feed, take a little and soak it in water for a period of time, including powder, and see how long it floats in the water to see whether the feed is good or bad. If it sinks quickly or loosely sinks, this material should not be used.
 
What’s more, you can go to see the floating fish feed machine in LIMA Machinery.