Fishmeal uses one or more kinds of fish as raw materials, after degreasing, dehydration, and comminution of processed high-protein feed. The quality of fishmeal is particularly important. How to distinguish between pure fish meal and adulterated fish meal, here's a brief introduction:
Observation
The standard fish meal is generally a powdery material with a uniform particle size and a slightly greasy appearance. A large number of loosely powdered fish muscle fibers and a small amount of bone spurs, fish scales, fish eyes and the like can be seen; the color is uniform, and is light yellow, yellow brown or yellowish brown; The hands are loose, not agglomerated, sticky, and not clumpy; there is a rich grilled fish flavor, slightly fishy flavor.
Floating method
Take a few samples into a clean glass cup, add 10 volumes of water, and let stand with vigorous stirring. Observe the floating surface of the water and sediments on the bottom of the water. If the water surface contains feather fragments or vegetal matter or sand and other minerals on the bottom of the water, the quality of the fish meal is not good.
Combustion method
According to the odor produced when the sample burns, it is judged whether or not to incorporate a plant material. When the authentic product is burned, it is the odor of hair burning. If there is an aromatic smell of dried grains, it indicates the incorporation of vegetable substances.
Test method
Microscopy is the most commonly used method to identify most adulterants. For example, the outer surface of the chaff chips in the chaff flour has vertical and horizontal stripes; the outer surface of the wheat bran has fine wrinkles and some of them have wheat hair; the cotton seed cake has relatively thick cotton seed shell fragments, and the brown or white cross section of the cotton seed cake is ladder-shaped. Some surfaces are accompanied by cotton thread; rapeseed husks are reddish-brown or black, thin, with a net-like surface; shell powder particles are square or irregular, grayish-white, opaque or translucent; peanut shells are a bit like or striped Prominences are also serrated; alkali-treated bones show small holes.
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