Why is it said that the southeast wind blows continuously for days in Beginning of Summer and squids rush into the mountains?

Our country has a vast territory, with a coastline of more than 10,000 kilometers, and more than 5,000 large and small islands along the coast. The flat "continental shelf" on the seabed accounts for about 23% of the world's total "continental shelf" area. The coast is rich in aquatic resources. There are more than 1,500 species of fish alone, and there are more than 200 species of major commercial fish. It is one of the countries with the largest fish production in the world.

Fishermen have accumulated rich experience in their daily fishing work, and have compiled these experiences into fishing proverbs in vivid language. For example: Zhoushan fishing proverb "The southeast wind blows continuously for days at the beginning of summer, and the squid (cuttlefish) rush into the mountains." That is to say, during the beginning of summer in early May, the southeast wind blows continuously from the sea off Zhoushan, which will cause the water temperature to rise, and the water will flow from the southeast sea to the coast of the northwest island. At this time, the squid is spawning, and the eggs will be attached to the rocks in the water. In addition, the squid itself has a very weak swimming ability, so it will swim to the mountain side with the current, causing the squid to rush into the mountain. This is the time to catch squid. peak season. There is also a saying that "the beginning of summer is violent, and the squid is anchored." In the fishing industry, "storm" refers to the northerly wind blowing at sea, and "anchored" means that the squid stops in place. During the Beginning of Summer, squid originally swam to the Zhoushan Islands in the northwest with the current. When strong northwest winds blew, the squid slowed down and became less likely to swarm, causing the phenomenon of "anchoring".

Another example is the fishing proverb "Float when the weather is cold and warm, float when the sun and night fall, and float when the water is clear and mixed", which means that when the water temperature decreases, the fish will sink, and when the water temperature rises, the fish will float up; when the sun is strong at noon, the fish will float. Fish schools sink, and the sunlight weakens at dawn or evening, and fish schools float up; water color is clear, and fish schools sink, and water color is turbid, and fish schools float up. This is a movement law caused by the contradiction between fish and water temperature, sunlight, and water color. According to this law, fishery workers use lights to lure scattered fish into groups, and adjust the height of the net according to the rise and fall of water temperature and the turbidity of water color. Make appropriate adjustments for targeted fishing. This will turn the off-season into the peak season, and the peak season even more prosperous.

In freshwater fisheries, there is also: "Catch running water when it's hot, catch deep pools when it's cold, catch windy feet, catch running water when it snows, catch clear water at night, catch muddy water during the day, catch dawn in the morning, and catch running water at night." "Fishing at dusk" and other sayings, which clarify the laws of the contradictory movements of freshwater fishes, weather and seasonal changes. According to these laws, fishing methods that suit the time and local conditions can be adopted.

In short, many fishing proverbs explain that the activities of fish schools are affected by various factors such as season, climate, water temperature, etc., and there are certain laws of change, which means "there are signs to be found and clues to be found." "There are phenomena before and after that can be considered." As long as we observe carefully and study hard, we can take the initiative in fishing and vigorously develop fishery production.