With the development of the aquaculture industry, the demand for fishmeal is increasing, and some unscrupulous traders are taking advantage of the opportunity to make fake profits. Farms should improve their ability to identify true and false fishmeal.

Standard fishmeal is generally a powder with uniform particle size and slightly oily appearance. It can be seen that a large number of loose fish powder fibers and a small amount of bone spurs, fish scales, fish eyes and the like. The color is light yellow, yellowish brown or yellowish brown. The hand has a loose feeling, does not agglomerate, does not stick, does not form a group, has a strong grilled fish flavor and a slightly fishy smell. Fish powder that is overheated or contains high fat will darken. If the color of the fishmeal is black and red, the appearance is tarnished, and the smell of burnt smell is smelly. It is a charred fishmeal that causes spontaneous combustion due to improper storage. If the surface of the fish meal is dark brown and has an oily smell, it is the result of fat oxidation. If the fishmeal has an ammonia odor, it may be a fatty degeneration in storage. If the fish is grayish gray or grayish yellow, the astringency is thicker, the gloss is not strong, the fiber is more, the coarse looks like ash, and it is easy to agglomerate. The powdery particles are finer and more small, and the touch is easy to be crushed, not seen or The rare fish muscle fiber is adulterated fishmeal and needs further testing. The inspection methods are as follows:

Floating method Take a small sample into a clean glass, add 10 times of water, stir and let stand, observe the surface float and bottom sediment, if there are feather fragments or plant matter, rice husk powder, peanut shell powder on the water surface , wheat bran, etc., or minerals such as sandstone at the bottom of the water, indicating the incorporation of such substances.

Odour test method Determine whether or not to incorporate plant matter based on the odor generated when the sample is burned. When the real product burns, it is a burning smell of hair. If there is aroma of dried and fried grains, it means that it is incorporated into plant matter. In addition, it is also possible to distinguish whether or not urea is incorporated based on the odor. Just take 20 grams of the sample into a small beaker, add 10 grams of raw soy flour and the right amount of water, cover with a stopper and heat for 15 to 20 minutes, remove the stopper, if you can smell the ammonia, it indicates the incorporation of urea.

Bubble identification method Take a small amount of sample into the beaker, add appropriate amount of dilute hydrochloric acid or white vinegar, if there are a lot of bubbles and squeaking, it means that it is mixed with stone powder, shell powder, crab shell powder and so on.