Xiang Yang nodded, "Give it a separate water tank."
Sea walnuts are very warlike and should not be kept together with other marine creatures.
Fang Youqun happily carried out a water tank from the cabin, filled it with sea water, and then carefully placed the azure sea walnut into the tank.
After doing all this, Fang Youqun turned his head and looked at Xiang Yang, "To be honest, I still think this sea walnut looks like a jellyfish."
Xiang Yang smiled and said, "If you look closely, you can see the difference between it and a jellyfish."
In fact, although water walnuts look similar to jellyfish, they are very different in terms of living habits, body structure, and predation structure.
For example, swimming.
Most jellyfish move forward in the sea by contracting their bodies to generate power.
But sea walnuts are different.
The sea has a different way of moving, a bit like an octopus.
The sea walnut has eight tentacles on its body, and it can generate power by flapping its tentacles rhythmically, thereby swimming forward.
But if you break it down further, the tentacles of the sea walnut are completely different from those of an octopus.
The tentacles of the sea walnut are actually ciliary plates, which are composed of countless tiny cilia. Although it can flap, it has no attack capability, which is completely different from the octopus.
In addition, jellyfish have countless stinging cells, which can be used for hunting, attacking and defending.
However, there are no stinging cells on the sea walnut.
Of course, sea walnuts also have their own strengths.
The tentacles of the sea walnut can contract freely like rubber. There are many sticky cells on them, which can secrete a kind of mucus that can firmly stick to prey.
Of course, the biggest difference between jellyfish and sea walnuts is that jellyfish only have one mouth, and both eating and excretion are done through that one mouth, just like a bottle, while sea walnuts have multiple mouths.
After dealing with the sea walnut, the remaining catches were all normal ones, some cheap and some precious, such as eagle pomfret, but generally speaking, the catch in this net was not that much, and there were no very valuable rare fishes.
Under the command of Chen Qingsheng, dozens of people worked together and soon sorted out all the fish into different categories. Those that needed to be packed were packed, those that needed to be put in the live water tank were put into the live water tank, and some of the fish that were not worth pulling back a long way were sent to the processing line to be made into fish meal and fish balls.
Immediately afterwards, Xiang Yang asked Zhou Wang to cast another net.
The second net caught much more fish than the first, about several thousand kilograms, most of which were squids and the like, and there was no eagle pomfret. Overall, the price was about the same as the first net.
Seeing that there was no gain from two consecutive nets, Xiang Yang decisively stopped ordering a third net.
"Now let's take a rest. Those who want to fish can go fishing, and those who want to sleep can go back to the cabin to rest." Xiang Yang looked at the nautical chart, checked the voyage, and confirmed that if there were no accidents today, they would not stop along the way, so he said to the crew.
Xiang Yang stood on the deck for a while. Although the sea was calm, the ship would generate a certain amount of wind when it was sailing. Soon, Xiang Yang felt a little cold.
Just when Xiang Yang was about to go back to the cabin, suddenly, not far ahead, Xiang Yang saw a group of strange marine creatures that looked like both fish and birds, whooshing out of the sea from the bottom of the sea.
"Huh? Birds collectively go into the water to hunt? Or flying fish?" Xiang Yang quickly widened his eyes and looked at the group of strange marine creatures.
There are many birds in the sea that can dive into the water, so it is not surprising at all.
But fish that can fly are still very rare.
Soon, Xiang Yang saw clearly that it was a group of very strange fish.
Looking at the fish body, they seem to be no different from ordinary carp, with a streamlined body and a spindle shape.
What really surprised Xiang Yang was that the elders in that group of fish had very developed pectoral fins, which looked like butterfly wings.
Xiang Yang counted silently in his heart, and soon, he was surprised to find that these fish could fly in the air for more than half a minute.
"This should be the flying fish." Xiang Yang thought to himself.
Xiang Yang knew that in the South Atlantic, there was a very strange flying fish called flying fish.
Flying fish have a very strange appearance, with long pectoral fins extending all the way to the tail, like the wings of a bird.
It can jump out of the water more than ten meters, stay in the air for more than forty seconds, and its maximum flying distance can reach more than four hundred meters.
On the blue sea, the flying fish appear and disappear from time to time, and the scene of them breaking through the waves is very spectacular.
But Xiang Yang discovered that those flying fish were not flying. Although it seemed that they were flapping their wing-like fins, they were actually just gliding.
Xiang Yang recalled the information about flying fish in his mind.
Flying fish are widely distributed in cold waters around the world and are famous for their ability to fly.
They are all small in size, with wing-shaped hard fins and an asymmetrical forked tail.
The height of the leap is enough to allow it to jump onto the deck of a ship above the water, and crew members often find flying fish fallen on the deck at dawn.
Flying fish live in the upper layer of sea water and are the target of various ferocious fish. The main purpose of flying fish flying is to escape from predators.
Flying fish do not jump out of the water easily. They only use their ability to fly when they are attacked or stimulated by the sound of a ship engine.
The flying fish has well-developed pectoral fins and its entire body is like a long weaving shuttle.
With its graceful streamlined body, flying fish can move at high speeds of ten meters per second in the sea.
The backs of the flying fish not far from the fishing boat were similar in color to the sea water. If it were an ordinary person, they would probably not be able to see the appearance of these flying fish at such a distance.
But Xiang Yang could see clearly.
Xiang Yang discovered that these flying fish would return to the bottom of the sea after flying for a period of time.
Before taking off, the flying fish accelerates beneath the water.
As they swim toward the surface, the flying fish keep their fins close to their streamlined bodies.
As soon as they break through the water, the flying fish immediately spread their large fins and quickly flap their tails in the water to gain additional thrust. When the force is sufficient, the tails are completely out of the water, and then they take off and glide a few feet above the water at a speed of nearly 20 kilometers per hour.
Xiang Yang knew that flying fish could glide continuously, and each time they fell back into the water, their tails would push their bodies up again.
In fact, the flight of flying fish is really just gliding.
Scientists use cameras to reveal the secrets of flying fish flight.
Flying fish actually use their tails to paddle the sea water to take off, rather than vibrating their pectoral fins as people imagine.
Before taking off, flying fish need to adjust their angle and swim quickly under the sea surface. When they are close to the sea surface, they keep their pectoral fins and pelvic fins close to the sides of their body. Then they use their powerful tail fin to swing sharply left and right, drawing a zigzag water mark, which generates a strong impact and causes the fish body to suddenly break through the water like an arrow. The take-off speed can reach 18 meters per second.