Here are some ways to identify the quality of fish meal.
 
Water-soluble method
Take a small amount of sample, put it into a clean glass or burner, add 10 times the volume of water, stir vigorously, and after standing, observe the floating objects on the water surface and the sediment on the bottom of the water. If there are feather fragments or plant substances such as rice husk meal, peanut husk meal, wheat bran, etc. floating on the water surface, and sand, gravel and minerals are found at the bottom, it means that hydrolyzed feather meal or plant adulterated substances are mixed.
 
Sieving method
Screen the fish meal sample with a standard sieve with an aperture of 2.80mm. At least 98% of the standard fish meal particles pass through. Otherwise, it means that there are adulterants in the fish meal. Use sieves with different meshes to detect the mixed impurities.
 
Odor test method
The authenticity of fish meal can be judged according to the smell produced when the sample is burned. When burning, if you smell the smell like pure hair after burning, it means that it is an animal adulterated substance; if you smell the aromatic smell when the grain is dry-frying, it means that the fish meal is mixed with vegetable substances; take 20g of the sample and put it into a small flask Or in a triangular flask, add 10g soybean flour and an appropriate amount of water, and heat for 15-20min after plugging. After removing the plug, you can smell the smell of ammonia, indicating that urea is mixed.
 
Bulk density method
The bulk density of pure fish meal is generally 450g/L to 660g/L. If the bulk density is obviously too large or too small, it means that there are impurities in the fish meal. The specific detection method is: take the fish meal sample very lightly and carefully pour it into a 1000ml measuring cylinder until it just reaches the 1000ml mark, and adjust the volume with a spatula or spoon. Note that when placing the sample, it should be handled lightly and not shaken or hit. Then pour out the fish meal, weigh it (make three parallel samples, take the average), and compare it with the capacity of pure fish meal.
 
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