Chen Yuan was reluctant to take back the drone for fear of losing the fish school.
The drone was about to run out of power, so Chen Yuan took it back.
There was no harvest in the past few days, and the drone's backup battery was not charged. Chen Yuan quickly dismantled the remote sensor, fixed the bow, and ran back to the cabin to charge the drone.
Zhou Sheng looked at Chen Yuan who was so excited: "Big school of fish?"
Chen Yuan took a deep breath: "The depth of the fish school is about 550 meters."
Zhou Sheng frowned: "Can tuna live at 550 meters?"
Chen Yuan rolled his eyes at him: "What kind of tuna can you think of that can stay at this depth?"
"Bluefin tuna, and it is an adult bluefin tuna, and it is relatively large." Zhou Sheng was stunned for a moment: "But, are there other small fish? The remote sensing fish detector cannot tell the size of the fish."
"Idiot."
"Damn it, can you please explain it properly?" Zhou Sheng saw Chen Yuan's disdainful eyes and felt that his own IQ was insulted: "How do you judge this?"
"The strength of the remote sensing signal." Chen Yuan rolled his eyes: "You have also seen the remote sensing display just now, and the signal source on it is clear. So, if you combine it with the water depth... at a depth of about 550 meters, what big fish will become
group."
When Chen Yuan said this, Zhou Sheng understood and quickly picked up the radio: "Master, the water depth is 550 meters, the number is more than 100, and the remote sensing signal is clear, do you understand?"
Lin Xinhai was stunned for a few seconds, and then became enthusiastic: "Follow me, don't lose me. I'm at full power here."
"What do you mean?" Luo Laosi asked weakly.
"It is initially estimated that the number of bluefin tuna is more than 100, and the water depth is about 550 meters. The average weight of adult bluefin tuna is definitely more than 200 kilograms."
Then, Chen Yuan heard a 'bang', and Luo Laosi shouted: "Is it true or false?"
"Most likely." Lin Xinhai said: "Chen Yuan, are you there?"
"exist."
"Can you tell if it's bluefin tuna?"
"In this area, except for bluefin tuna, I can't think of any other large fish that can swim in groups at a depth of 550 meters." Chen Yuan took a deep breath: "We follow these groups, you should be faster."
"Okay." Lin Xinhai thought for a while and then said: "When do you think these fish can come out of the water?"
"Between midnight and tomorrow morning, tuna moves very fast. If you can't make it to join us at two in the morning, you have to wait for the time again."
"Okay. What's your current speed?"
"Verse 13."
Lin Xinhai wanted to scold her: "Running so fast?"
"The tuna will rest, don't worry."
Lin Xinhai quickly calculated the distance between him and Chen Yuan, and then calculated his speed. For a moment, he felt bad.
For a long time, Chen Yuan and the others had not found any schools of tuna. Lin Xinhai had been taking their time, mainly to save fuel.
He is now 7 nautical miles away from Luo Laosi and 42 nautical miles away from Chen Yuan and the others.
Not only Lin Xinhai has slacked off during this period of time, but also Luo Laosi.
There had been no big gains for too long, and Luo Laosi was ready to go back at a loss.
Chen Yuan's fishing boat was fast, running 20 knots, which was 9 knots faster than the Xinhai. At the end of the day, the distance was easily increased by dozens of nautical miles.
Luo Laosi's side was fully powered and ran at a speed of 17 knots, close to 18 knots. The fishing boat dragged a long tail in the calm sea.
"Shengzi, where are you?" Luo Laosi shouted.
Zhou Sheng reported the position and said: "We will follow the fish, you come here quickly."
Bluefin tuna is said to have a top speed of more than 100 kilometers per hour.
In fact, without being frightened, the fastest speed of a bluefin tuna is estimated to be about 70 kilometers per hour. But under normal circumstances, it will not swim so fast.
Normally, it is more than 20 kilometers per hour, which is more than ten nautical miles.
Tuna also need to rest and sleep, but tuna have a special structure. Even when they are resting, they are still swimming and will not stop.
When resting, if there is a large group of tuna, they will circle in a circle or move forward slowly.
Chen Yuan is also calculating the speed of the tuna and the position of the Xinhai.
Tuna swim towards the direction of Zhongsha, where there are many fishing boats.
"Gan." Chen Yuan patted the stool.
"What's wrong?"
Chen Yuan pointed to the dashboard of the fishing boat: "Look at this speed."
"Is there a problem?"
"Ask Master how far away we are."
Zhou Sheng was also startled suddenly and picked up the wireless phone: "Master?"
"receive."
"How far...are you from us?"
"40 nautical miles."
Luo Laosi asked: "Any questions?"
"How many nautical miles is your fastest?"
"Around 14."
Tuna doesn't stop and wait for the Shinkai.
If we can't catch up with this group of fish tonight, it will be even harder to catch up with the fish at the current speed tomorrow morning.
"What is the approximate speed of the fish school per hour?"
"We did some math here and found that it's 12.5 knots, which is 23 kilometers per hour. These fish are not exerting force..."
"I really want to catch up." Lin Xinhai felt embarrassed and said, "When the fish come up at night, you can catch them and drive them back."
Chen Yuan let out a long breath.
Bluefin tuna will not always stay 550 meters deep in the sea. They will slowly float up. After they float up, the speed of the fish school will be faster.
This is why tuna fishing boats are required to have a speed of at least 25 knots.
Chen Yuan had a big head: "Go back to catch fish..."
When rounding up tuna, the fish are usually chased only when the seine is being used. Fish are not sheep, so they can be chased at will.
The sky is completely dark.
The half-moon is bright and the sky is filled with stars.
After ten o'clock in the evening, the tuna slowed down and floated to about 300 meters above the sea surface.
In the latter half of the night, these tuna will probably come out of the water.
There is still time, and after dark, the tuna swimming speed is obviously much slower, and they move in a large circle.
"The tuna is gathering." Chen Yuan contacted Lin Xinhai.
"Okay, that's good, I can make it there." Lin Xinhai breathed a sigh of relief.
Luo Laosi also breathed a sigh of relief. If they didn't catch up with this school of fish, it would be a joke.
In two months, I had to keep such a net. If I hadn't surrounded this school of fish, Luo Laosi would probably have had his blood pressure soar.
"How far is it?" Zhou Sheng asked.
"28 nautical miles." Lin Xinhai said.
"Okay, the tuna is still 300 meters away from the water, so hurry up." Zhou Sheng shouted anxiously.
This water outlet is not the tuna rising to the surface, but the position closest to the sea surface, and it is also the best position to lower the net.
"Lao Hai can't catch you, but I can." Luo Laosi said with a smile, "I can surround him."
"You can surround your balls." Lin Xinhai said: "If your boat can surround tuna, what else do you need me to do?"
"What do I want you to do? You should be faster."
As Lin Xinhai was talking, the fishing boat suddenly slowed down and then lost power.
At this moment, Lin Xinhai's scalp went numb: "Old Dong, what's going on?"
Lao Dong was an engineer, and he shouted twice but received no response. Lin Xinhai handed the driver's cab to the ship's mate, trotted out, and saw Lao Dong drinking with someone, his face flushed.