1, scale the fish well.
2, find the fish's measuring line and make a cut at the tail, cut deeper.
3, make a cut about a centimeter back from the gill cover of the fish, slightly shallower, about a millimeter or so.
4. Find a white thread inside the fish and pinch it with your fingers.
5. Tug it outward and tap it with a knife from the end of the fish upward until you pull out the measuring thread.
6, the same way to the other side of the measuring line.
Introduction:
Fishy line that fishy line is the fish feel the flow of the water body sensory organs. On the back of the fish spine there is a kind of fish scales called lateral line scales, on the top of the lateral line scales there are many neatly arranged small holes, and directly with the fish in the body of the ichthyic line, and some of the odors of the external environment, such as the earthy smell of the water through the holes directly attached to the ichthyic line. The ichthyic threads of grass carp, crucian carp and carp are more obvious and easy to take out, while those of marine fish are not as obvious as those of freshwater fish. It is mainly used to sense the stimulation to the outside world, the strength of the odor.