Generally speaking, although large fish are extremely rare in small water surface, the density of crucian carp is larger, and although there are large fish in large water surface, the density of fish is lower. Therefore, for the selection of fishing positions, the more ** the water surface, the more difficult it is to choose the correct fishing position, because the density of the fish is smaller, the more uneven the distribution. Fish are ectothermic animals, and have the habit of chasing temperature and oxygen, so they will change, and if you want to choose the right fishing position in a large water surface such as a reservoir, there are roughly the following ideas. 
1. Temperature-by-temperature and oxygen-expelling fish have the nature of temperate and oxygen-excess, and like to hide in areas where the water temperature is more suitable and dissolved oxygen is more sufficient, so if you want to find a suitable terrain, you must first understand what factors will affect water temperature and dissolved oxygen. For example, in the cold winter, even the hardy crucian carp is in semi-hibernation, and the activity is poor to the peak, and there is no requirement for dissolved oxygen at all, so sometimes the level of dissolved oxygen is completely unconsidered. The water temperature has a lot to do with the depth of the water, the wind, and the lighting. 
Generally speaking, deep water is cooler than shallow water, but it is special in winter when it freezes, deep water is warmer than shallow water, and deep water must have less dissolved oxygen than shallow water. If the water temperature is higher in a well-lit area, then the water temperature will be higher and the dissolved oxygen will be lower if the water temperature is lower in a shady place. The water temperature is higher in sheltered areas, but not as much dissolved oxygen as in upwind and crosswind locations. Therefore, when choosing a fishing position on a large water surface, the most important thing is to first look at the wind direction and choose a fishing position in different directions according to different temperature conditions. If the temperature is high, you should fish for headwind, if the temperature is low, you should fish for shelter, and it is best to fish for headwind, if it is neither hot nor cold. 
2. Terrain and DepthWhat terrain will the number of fish be more? It must be a safer and more convenient place to hide, so we often say that fish have three tendencies, namely temperature, oxygen, and feeding, in fact, there are safety factors, and fish rarely go to unsafe places, unless they are forced to do so. Therefore, there is such a saying in the choice of terrain, the terrain is different from the surroundings, and it is often a good fishing position, and the reason is that places with special terrain are often relatively safe places. For large fish, they usually do not hide in obstacle areas such as rock crevices and aquatic plants, but prefer to hide in muddy water or areas where there is a boundary between deep and shallow. In fact, the junction of deep and shallow water is the mainstream choice when fishing for big fish, because the food is in shallow water, and deep water has safety factors, so big fish often hide in the area of deep water next to shallow water, which is not only convenient for foraging but also more convenient for escape. 
From the perspective of topography, the two sides of the bay, the width and narrowing, the tip of the ploughshare, the water peninsula, the slope, the underwater ridge and so on, are more special, if you carefully compare it, you can find that in fact, the terrain basically has the characteristics of "slope", which is a typical terrain of deep and shallow water. Choosing the right deep and shallow water terrain is faced with a problem, fishing deep or shallow? If the depth is not right, then you will not be able to catch a fish. Roughly speaking, the fish must be shallow when they are foraging, and the fish should be deep when they are resting. So that's how the saying comes from moving three times a day and slipping away sooner or later. Fish tend to eat intensively in the morning and evening, and when the temperature rises and the light intensity increases, they hide in deep water. The intensity of the light also affects the depth of the fish's location, so when the light is not strong on cloudy, foggy, or rainy days, you can fish shallow in the season when the temperature is right. 
There is no terrain that has fish all year round, for example, the general direction of the choice of different wind directions is different, and the same classic fishway terrain ploughshare will not be a good fishing position because of the different locations. Please pay attention to the collection and like, update on time every day, thank you fishing friends!