Near a lake, Feiyan said: "It seems that the salt content here is very high, close to 3%. The salt content in Qinghai Lake is already very high, 1.25%."
The average salinity of the ocean is 3.5%, which means that 3.5% of the seawater's weight consists of dissolved sodium chloride.
Xu Jingsi said: "Why is the salt content here so high?"
Shao Zheng said: "It may be to simulate the seawater environment."
To simulate the lake water into a seawater environment, you can consider the following aspects:
Seawater is usually more salinity than lake water, so the salinity of lake water can be adjusted by adding salt. According to the required seawater salinity, you can refer to the average salinity of seawater (about 3.5%) to add an appropriate amount of salt.
The pH value of seawater is usually slightly higher than that of lake water. The pH value of lake water can be adjusted by adding an appropriate amount of alkaline substances (such as sodium bicarbonate).
The temperature of sea water is usually slightly higher than that of lake water. The temperature of lake water can be adjusted by heating the lake water or using heating equipment.
Seawater dynamics simulation. Seawater usually has dynamic characteristics such as tides and ocean currents. The dynamic environment of seawater can be simulated by setting up water pumps and water flow devices.
There are various marine organisms in seawater. You can consider adding an appropriate amount of seaweed, sponges and other organisms to simulate the biological environment of seawater.
The simulated seawater environment is as close as possible to the actual seawater environment.
Shao Zheng said: "Let's see if there are any hydraulic power facilities nearby."
They searched along the edge of the lake. Feiyan said: "There are indeed some water pumps. Speed up the flow of water."
He went to ask the management. "What is the water pump here for?"
"It's just for changing water."
Shao Zheng said: "This is already in the lake, do you still need to change the water?"
"If the water can flow, it will be clearer and it will be easier for oxygen to pass through."
Shao Zheng said: "Then why is the salinity so high?"
"There is a salt mining field not far away. It may have slipped in."
Xu Jingsi said: "Well, I can't figure it out even if I ask him. Let's go down and have a look."
They first went to buy diving equipment.
Xu Jingsi said: "How can we talk underwater?"
Feiyan said: "You can use diving gestures, so just use sign language to communicate."
They got on the boat, arrived at the center of the lake, put on their wetsuits, and went into the water to check.
When I first dived in, there were no fish.
As I continued to dive, I saw something swimming towards me from a distance.
It turned out to be a turtle.
It has a round body and a hard shell. The shell has an upper carapace and a lower plastron. The carapace is dark green with irregular ridges and lines. The plastron is light yellow.
The limbs are strong and powerful, suitable for swimming in water. Their forelimbs evolved into fin-like structures that helped them maintain balance and propel themselves through the water. The hind limbs are thicker and used for paddling and controlling direction. The tail is long and has a flattened shape that helps them move quickly through the water. The end of the tail has a pair of fin-like structures called caudal fins.
The head is relatively small, with nostrils and eyes. Their eyes appear black and have good vision. The mouth has a curved shape.
Feiyan said: "It should eat seaweed, aquatic plants and other marine life."
Shao Zheng said: "Does this place have its own food?"
Feiyan said: "Look around again. Seaweed or aquatic plants."
Dive close to the bottom and there are many starfish.
Starfish are beautiful sea creatures with a flat body and usually five or more tentacles that extend out and are arranged in a radial pattern.
There are many starfish at the bottom of the lake, varying in size and shape. Some starfish have short arms, while others have very long arms. Their size ranges from a few centimeters to tens of centimeters. Starfish are unique and beautiful in appearance, and their variety of colors and shapes make them highlights of these waters. The skin of starfish is smooth and soft, showing bright colors, including red, orange, yellow, blue, etc.
Starfish tentacles have many small tube-like structures called tentacles. These tentacles have many suckers used to capture food and attach to the seafloor. Their tentacles and suckers help them live and find food. The ends of the tentacles usually have eyes for sensing their surroundings.
There are some seaweeds near the bottom of the lake.
Shao Zheng said: "Why go to such trouble to arrange it into a seawater environment?"
Xu Jingsi said: "Is it necessary to cultivate some marine life?"
Shao Zheng said: "We can see these kinds of marine life here."
Feiyan said, "Look what's in front of you?"
Like the electric eel, a long, thin fish with a snake-like body and no scales. The body is gray and brown with yellow spots. The body is very soft and can bend and stretch, allowing it to adapt to different environments and hunting methods. The head is small, the mouth is wide, and there are two small eyes. They have no dorsal or pelvic fins, but have a slender tail that they use to swim and maneuver their bodies. It is indeed an electric eel. It has many electrical organs on its body, which allows them to produce powerful electric shocks. The length is more than 1 meter and the weight is estimated to be 15 kilograms.
Xu Jingsi said: "But this is different from ordinary electric eels."
Feiyan said: "What's different about it?"
Xu Jingsi said: "It's the position of the mouth." Xu Jingsi pointed to the position of the mouth.
Feiyan said: "I don't know, maybe it's because the hunting habits are different."
Xu Jingsi said: "This place is also quite strange. I just need to check it out carefully."
Several electric eels swam past leisurely at first, then suddenly turned and attacked them. It swam quickly and released a powerful electric shock. Several people were shocked at first, and then cleverly avoided the electric eel's attack. Quickly jump away to avoid the electric current released by the electric eel. Fortunately, he reacted quickly and used agile and flexible movements to avoid the electric eel's attack. Then float quickly.
Xu Jingsi dived quickly, reached the bottom of the water, cut a piece of seaweed with a knife, then walked around behind the bridge pier and began to float up.
He needs to take away some seaweed to analyze its characteristics. By analyzing its characteristics, we can understand their ecological habits, food chain relationships, and ecosystem conditions. As an important part of the marine ecosystem, seaweed plays an important role in the survival and reproduction of animals. The characteristics of marine animals can be analyzed through seaweed.
Xu Jingsi said: "The animals they tamed in the dungeon have the function of absorbing electric energy and discharging electricity. Then the animals tamed in this water area also have the function of discharging electricity. I don't know what it has to do with this water area."
Shao Zheng said: "Maybe we need to take the water route."
Feiyan said: "That means electricity may need to be transported through waterways."
