First, look at the color of the feed, the uniformity of the particles
Feed color and the same color of raw materials, in general, it is dark brown or brown.Do not rule out the existence of other circumstances.
Second, smell the smell of feed
Normal feeds generally have a faint smell and fishy smell. Fake feed has an unpleasant fishy smell, the fake feed water soak for some time, it will become a touch of fishy smell, or fish smell disappeared.
Next,see grinding degree of feed and water
The method is to catch a feed into the water, we have to observe the time of the spread of the feed, and check the feed thickness, uniformity.
Finally,feeling the taste of the feed, the content of impurities
Though the fish feed is swallowed, but the taste is good or bad is the main factors affecting their feeding behavior. Through our mouth with the touch, taste the taste of the particles, impurities (such as sand, soil) degree and whether the smell.
If the soil taste, it proves that the feed contains sand, soil and other impurities，impurities less feed than other feed the better; if tasted to bitter, sour, astringent and other smell,feed raw materials or finished products with mildew phenomenon.