How to catch crucian carp in winter and see if there are any fish in the river?

If there are small and dense fish bubbles on the water, there are crucian carp below. Crucian carp is a gregarious species, so it is a nest for crucian carp to swim underwater for food. In addition, to catch crucian carp, you should pick a recess, which is the place where the waterfront is sunken. Some people say that carp fishing is convex, but carp fishing is concave! When fishing crucian carp in winter, you should use fishy food, such as red worms and earthworms, and the bait is fishy bait for fishing!