What tide is better for fishing?

The best fishing time is between three-thirds of the tide to the seventh-grade tide or three-thirds of the tide to the seventh-grade of the falling tide.

Tides are the rise and fall of sea water. It is generally customary to call the tide tide. The rise and fall of sea water during the day is called tide, and the rise and fall of sea water at night is called tide.

Sea fishing is different from freshwater fishing. In addition to the effects of temperature, air pressure, wind direction, etc., it is also closely related to tides. As the saying goes: "Catch the fish when the tide is high and low, and sleep on the low tide when the tide is dry." Explains the importance of tides to sea fishing. The ebb and flow of the tide causes the seawater to flow; when the tide rises, the seawater flows towards the shore, carrying algae, plankton, planktonic fish eggs, juvenile fish, shrimps, etc. in the water. At the same time, the seawater washes the shore, increasing the amount of bait in the water. . Therefore, a food chain for marine life is formed, fish are actively foraging, and fishing and hook biting are frequent at this time. The fishing effect is slightly worse at low tide than at high tide. During high tide and dry tide, fish almost do not eat. Therefore, sea fishing is best carried out during high tide or low tide. The best time to fish is the "three-seven" tide, that is, the period from the rising tide to the seventh-third of the tide or the falling tide from the third-third to the seventh-third of the tide.

Mastering the laws of tides is a compulsory course for sea fishermen. Only by grasping the tides can we control sea fishing. The ancients said: "The morning tide comes and the evening tide comes and goes on time. The moon is in the northeast, and the tide is known." The tidal phenomenon is mainly caused by the gravitational pull of the moon and the sun on the earth, that is, the tidal force. Because the moon is closest to the earth, its gravitational pull on the earth dominates. The earth is constantly rotating, and one rotation of the earth toward the moon takes 24 hours and 50 minutes. Most places on Earth, except for the poles, always face the moon at one time and face away from the moon at another time. Where the earth faces the moon, the moon's gravitational pull is greatest, causing seawater to reach high tide. Where the earth faces away from the moon, the earth's centrifugal force is greatest, causing seawater to reach high tide. That is to say, within 24 hours and 50 minutes, the seawater forms two high tides and two low tides, which are often called semidiurnal tides (most areas in my country have semidiurnal tides).

Although the gravitational pull of the sun is smaller than that of the moon, their positions relative to the earth change all the time, causing complex tidal phenomena. The two spring tides and two neap tides every month are caused by the superposition or weakening of the two's gravitational pull on the earth. On the first and sixteenth day of each month on the lunar calendar, the earth, moon and sun are in the same straight line. The gravitational pull of the moon and the sun on the earth is superimposed, and the tidal force is greater, making the sea water rise the highest and set the lowest, forming a spring tide. On the seventh, eighth, 22nd, and 23rd o'clock of each month, the gravitational pull of the moon and the sun is exactly opposite, and the tidal force decreases, causing the rise and fall of the sea water to be small, resulting in neap tides. However, due to the influence of various resistances when seawater flows, the appearance of large and small tides lags for about two days. That is to say, big tides occur on the second, third, seventeenth, and eighteenth days of each month; and neap tides occur on the ninth, tenth, twenty-fourth, and twenty-fifth days of each month.

Fishermen should know the times of high tide, low tide, high tide and low tide in the local waters every day, otherwise they need to check the local tide timetable.

People have summarized various methods for calculating tidal time in the practice of long-term marine activities. Among them, the "eight-point tide calculation method" is used in sea areas with significant semidiurnal tides. Here is an introduction for your reference:

High tide time in the first half of the month = (Lunar calendar date - 1) × 0.8 + average high tide coefficient

High tide time in the second half of the month = (Lunar calendar date - 16) × 0.8 + average high tide coefficient