Can drive schools of fish in the water or scare fish 30

Marine fishing can be divided into coastal fishing according to the scope of operation. Fishing in the open sea.

Pelagic fishing. Harvesting is divided into three steps; 1 Detect the location of fishThrough the fish detector, it can accurately detect the location, depth, type and other information of the fish, and once the fish are found, it will judge whether it can be caught completely. If possible, we will move on to the next step of the tool.

2 Drive away the fish and let them gather. Through sound wave drive, artificial fright and other actions, the use of sound, light, electricity or air curtains to lure or drive away, so that the fish swarm. 3 After the official fishing uses sound drive or pulse current to catch the fish, the fishing operation is carried out jointly with open nets, gillnets, large pull nets or purse seine nets.

Fishing boats and gear are the main fishing tools. Fishing boats range from small boats of less than 5 tons to large boats of about 20,000 tons; According to the type of operation, there are fishing operation vessels, processing mother ships and transport vessels. Modern large-scale fishing vessels are generally equipped with relatively complete fishing machinery and navigation and fishing aids such as radars, locators, satellite navigators, and fish detectors.

There are 12 categories of fishing nets, such as trawl nets, purse seine nets, gill nets, stretch nets, ground pull nets, laying nets, traps, fishing tackles, rake thorns, and cage pots. Among them, the output of trawl nets, purse seine nets, gill nets, and stretch nets accounts for more than 90 percent of the marine catch.

Surely, it's a way to go to the immigration department, get the fish together, and then use a fishing net to catch it.

It's okay, you chase them and they'll run.

It's a very quarrelsome.

On the surface of the lake and pond, the boat man uses the long bamboo dry to beat the water surface with the bow of the boat, which can drive the fish to move in the water, and then cast the net to catch the ..

Oh, those who go down to the net want to go down to the net to get more fish, so after the net is down, they try their best to catch the fish in the direction of the fishing net, I often did this when I was a child, the method used at that time was to go down to the river when the water was shallow, and throw stones into the water when the water was deep, and sometimes knock on the bottom of the boat on the boat.

There are two commonly used methods.

One is to sprinkle fish food in one place to lure.

The other is to throw stones into the water or use a long hand to drive the water away?

Use more people, shake the net, and the fish will move when they are frightened and go online.

When I was a child, I saw a fisherman on a boat, constantly knocking on the boat and running back and forth in the river, I guess this method is good. You can give it a try.

The sound of knocking on the boat gang can make the fish flee in fright, drive them to a predetermined place, and then catch them all.

Fertilizer, after sprinkling fertilizer, the fish will not eat for a period of time, and they will not be able to catch fish, which is a common trick used by many fish ponds and reservoir contractors.

Sixth, there is a lot of fishing on Sundays, and they will always sprinkle on Friday nights.

The sound we hear is generally transmitted by air (gas); When you tap the fish tank, you will be frightened when you find that the fish in the water can also make sounds; "Tu**" uses the cotton thread connecting two round cartons as the medium for transmitting sound, and the sound made by the speaking student is transmitted to the ears of another student through the vibration of the cotton thread, indicating that the solid can also transmit sound There is no medium for transmitting sound in the vacuum, so the vacuum cannot transmit sound

So the answer is: air; Liquid; Solid; Gases, liquids, solids, vacuum

Of course, yes, although fish are short-sighted and rely on their sense of smell to find food, they have a very sensitive sense of hearing.

Fish in the water can hear people talking, because sound can be transmitted through various media, and water can also transmit sound, so fishing cannot speak loudly.

This will frighten the fish, and the fish can hear the human speech in the water, because the human speech causes the vibration of the air and the water medium, and in this way the sound waves are transmitted and the fish are frightened.

Fish hear the sound of people in the water very clearly, and the water can also convey the sound of the past. So as soon as you speak, a lot of fish will quickly leave this position.

Can talking loudly while fishing really scare the fish away?

You're talking about the "catfish effect".

Spaniards love sardines, but sardines are very delicate and not adapted to the environment after leaving the sea. When the fishermen put the freshly caught sardines in the tank and bring them back to the dock, it doesn't take long for the sardines to die. Dead sardines don't taste good and sell poorly, and if the sardines are still alive when they arrive at Hong Kong, the price of the fish will be several times higher than that of dead fish.

In order to prolong the life of sardines, fishermen try to get the fish alive to the port. Later, fishermen came up with a way to put several catfish, the natural enemies of sardines, in transport containers. Because catfish are carnivorous fish, after being placed in the fish tank, the catfish will swim around looking for small fish to eat.

In order to avoid the devouring of predators, sardines naturally speed up their swimming, thus maintaining their vigorous vitality. In this way, the sardines are returned to the fishing port one by one.

This is known in economics as the "catfish effect".

If you remember correctly, it should be a ferocious pike, and my teacher also told this story before, which is a metaphor for not succeeding without fierce competition and surviving.

If the fish is fed, it will never take the bait, or it will change its feeding habits so that it does not like to eat the angler's bait!

Fish hook just straighten it and learn Jiang Ziya.

Give me 500 percent and I'll tell you about it!