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"Haha...... You don't have to praise me, this time we were able to catch so many fish, one is because there are so many fish here in Hokkaido, and the other is the sonar detection technology, otherwise we would have half of our fishing boats so quickly!" Brett laughed. Pen, fun, pavilion www. biquge。 info

"Yes, I have to say that this sonar detection technology is really powerful, and it can detect whether there are fish in the sea within nearly a thousand meters nearby, which is really against the sky!" Robin also sighed.

"It's a pity that the headquarters allocated too little money, and only one fishing boat has installed a vertical sonar fish finder, and if this technology is installed in every fishing boat, we will catch more fish." At that time, each fishing boat will be able to act alone. Dennis was a little dissatisfied.

"Dennis, you're wrong about HQ this time! It's not that HQ doesn't want to allocate money to form a more powerful fishing team. However, this sonar detection technology is an advanced technology, which has been applied to the navy and the military before. It is only now that it has been loosened to fishing. For example, we are currently using a vertical sonar fish finder. It's incredibly expensive, and it took a lot of money from the higher-ups at the headquarters to buy it!" Brett explained.

"I see, then I'm really wrong. But it sounds like this kind of thing is really not something that ordinary people can afford. I don't think the turtle fishing team in Nemuro Fishing Port will definitely be able to use it. Dennis laughed.

"Not only can't they afford it, but it's probably hard for them to buy it if they want to. Robin laughed too.

"We have advanced fishing technology and a large fishing team, we can definitely mix well here, and maybe we will become the No. 1 ocean fishing team in Hokkaido in the future!" Brett said with a look of hope.

"We have the technology to detect fish by sonar, and I think we should have the opportunity to do it!" Now that the U.S. imperialist distant-water fishing team has this detection technology, not to mention the whole of Hokkaido, it is absolutely the only one in Nemuro Fishing Port anyway! They are now in the rhythm of the struggle for supremacy.

Sonar technology was invented in 1906 by Lewis Nixon. By the time of World War I, it began to be used on the battlefield to detect submarines lurking underwater, and these sonars could only be used to listen passively, which belonged to passive sonar, or "hydrophones".

However, the technology of sonar detection of fish schools has been developed and applied since after World War II.

During the Second World War, submarine destroyers equipped with military sonar sometimes mistook schools of fish for submarines and attacked, which aroused interest in sonar fishing. After the war, some countries borrowed warships equipped with sonar to conduct fish exploration research.

In the 40~60s, vertical fish finders and fishing sonars appeared, making underwater acoustic reconnaissance the main means of modern fish reconnaissance. In the 60s, sonar became an important piece of equipment for purse seine and mid-level trawlers. In the mid-60s, the technology of indirect reconnaissance of fish schools by space remote sensing began to enter the practical stage.

Among them, 45~50 years was the first vertical fish finder to appear, and it was only after the 50s that fishing sonar was studied.

Fishing sonar is much more advanced than vertical fish finders!

The fish finder is mainly composed of a transmitter, a transducer, a receiver and a recording display. The commonly used working frequency is 20~200 kHz, and the depth of fish detection can reach 1000 meters.

More advanced and later than it came out is fishing sonar!

Fishing sonar Fishing sonar is composed of a transmitter, receiver, terminal display, transducer base array, etc., and its working principle is similar to that of a vertical fish finder. The difference is that the vertical fish finder only provides the fish information under the vertical of the fishing boat, while the fishing sonar can realize the detection of all directions around the fishing boat, and can provide a variety of information such as the orientation, distance, depth, and swimming speed of the fish, and its operating distance is required to be as far as possible and the resolution is required to be as good as possible.

The effective fish detection distance it can achieve is generally about 1,000 meters in shallow waters and thousands of meters in deep sea areas. The working frequency is generally between 20~200 kHz.

At present, the US imperialist distant-water fishing fleet uses vertical fish finders, and it is estimated that it will not be used until one or two years later. Even if someone uses it, not everyone can afford it, not the kind of local tyrant fishing team can't afford it.

For example, it is estimated that it will take 55 years for most fishing fleets to be widely used, and it is not until the 60s that fishing sonar enters the fishing vessels of the vast fishing fleet.

For example, in the 50s, even vertical fish finders could only be used by large fishing fleets like those under the name of the US Imperial Ocean Fishing Company!

"Captain, there are schools of herring at a depth of 100 meters in the reverse of the fish finder!" a technician ran in and reported while the three of them were chatting.

When the three of them heard this, they were neither happy nor sad, because they were used to the schools of fish that appeared.

"Okay, immediately organize people to set up a seine net, and we must eat this school of fish!" Brett said loudly with a wave of his hand.

I have to say that this US imperialist ocean-going fishing fleet is very powerful, the fishing boats are advanced, and there are fish search instruments. Brett and others are also experienced in fishing, and can often find areas where schools of fish are frequent. Coupled with the assistance of the fish search instrument, it is simply twice the result with half the effort!

Twenty fishing boats are frantically catching all kinds of fish here, like a gold-swallowing monster.

On the fishing boats, the sailors who were local to Nemuro Fishing Port were also shocked to see so many fish caught by the US imperialist fishing boats these days!

"I overheard a few days ago that one of the fishing boats of this US imperialist ocean-going fishing fleet has an advanced instrument called a fish search instrument, which can detect schools of fish under the sea! When they were done, the sailors huddled together and chatted. Those American imperialists generally look down on them and don't bother to bird them. So they, the local sailors, had to hide on their own.

"I've heard about it, so I'll just say it. Half of the fishing boats are full in a week, so there is such advanced technology!"

"Sonar detection, isn't that for warships? It can detect fish?"

"I don't know, but I think that Brett is an experienced fisherman and he's really good at finding fish. He seems to know the sea and currents here. He can tell where the fish are more frequent and where they are suitable for fishing. I overheard some of them gossip yesterday!" said a cultured sailor, who understood English, pushing his glasses.

"Hmph, don't forget, these American imperialists are catching our own fish......!

"Huh...... And you still have to work for them? It's not forced by life?"

………………

On the other side, after eating the swordfish feast, Shuichi Minamino continued to lead the fleet to fish the next day. In the morning, two schools of cod were caught, and about 30,000 were caught.

At noon, Shuichi Minamino received a prompt sound from the system after finishing his meal in a hurry.

"Ding-dong...... To the southwest, schools of cod were found 10 nautical miles from the host at a longitude of 152.1 and a latitude of 49.9. Quantity: 20,932!"

"Ah~ I'm just going to get busy again after eating. Shuichi Minamino muttered to himself.

Without saying so much, Shuichi Minamino ran to drive the fishing boat himself and set off towards the position of the fish.

"The ability to locate fish is sometimes a hard ability, and the greater the ability, the more tired it is!" said Minamino Shuichi. In fact, he didn't know that he was much more tired than he was incapable.

The process of finding fish in a distant-water fishing process is often a matter of luck. With sonar detection and the advent of satellite remote sensing, distant-water fishing has become less difficult.

Besides, those advanced scientific and technological instruments are not available to those poor fishing boats. In this era, most of it depends on experience. Even in the sixties, it was based on experience.

Shuichi Minamino's fishing fleet was slowly approaching the school of cod fish he had just found, and when Shuichi Minamino was still a few nautical miles away from the fish, he was surprised to find that he had been taken first!

Just now, after Nagano Shuichi found the fish, he hurriedly went to start the boat, and he didn't switch his vision to check the situation of the fish. Anyway, he thought that the fish would not be able to run away, and he didn't bother to check it.

But now when he came to the vicinity, he saw a large fishing team catching the cod fish that he had found in the system before!

These are all known to Shuichi Minamino himself, but the sailors on the fishing boat are different from Ishida Yu. When they saw the 20 fishing boats a few nautical miles away, they all exclaimed.

"Which fishing port is this fishing team? It's so big, there are 20 of them, oh my God!"

"I guess it's some kind of improvised fishing team. Otherwise, how could a fishing team have as many as 20 fishing boats. More than a dozen fishing boats are up to the sky. Like the fishing team in our Nemuro fishing port, ten fishing boats are incredible. One sailor guessed.

"Hey, no, it looks like they're the fishing team of our Nemuro fishing port. ”

"Ah, by the way, I know, they are the U.S. imperialist distant-water fishing fleet that has just been established by the U.S. Imperialist Distant-Water Fishing Company! I don't want to fight them, they have just been formed, they were still recruiting people a week ago, and now they are going out to sea to fish, which is really fast enough." Ishida exclaimed, wide-eyed. Apparently unbelievable.

"So it's them!" Minamino muttered. However, he was a little puzzled, how could the fish he found be the first to be taken by these guys?

"Did they catch the fish when they found it, or did they find it before me?" said Shuichi Minamino. (To be continued.) )