The weather is cold and the fishing depth is deep.

In most cases, fishing is deeper when the weather is cold. Because in cold weather, fish will become very "lazy" and unwilling to move, and most of them will lie dormant in deep water without eating or moving. In fact, this is the same reason that people don't want to move in winter and can lie under the covers for a while in the morning (or all animals do).

In fact, strictly speaking, there is no standard, consistent and accurate answer to this question, because there are too many objective factors that will affect the result, so we must analyze it flexibly according to the actual situation in reality.

For example, in the following situations, shallow fishing is needed to deal with it:

1. An area with hay or aquatic plants on the shore. Because aquatic plants keep out the cold and keep warm, and because of sunlight, the temperature in shallow water rises faster and more obviously, so fish will swim to warmer areas.

2. One or two days before the temperature drops. Especially one or two days before the cold wave comes in winter, fish love to bite the hook. Because the fish know that it will be cold soon, they need to actively feed and supplement nutrition and heat energy in these days to resist the cold and bad weather and spend the winter safely.

3. When the sunshine is particularly good, the shallow water is warm, and the fish will naturally go to the shallow water to keep warm.