In the end, Ao Daguo went to get the magnifying glass. The cockpit has this thing, which is a traditional tool for ship driving. It used to be used to look at nautical charts, but now there are electronic maps and gps, but there are still magnifying glasses on the ship.

It looks like the naked eye that the scales of the grouper are very smooth and there is nothing special on them. However, through a magnifying glass, you will find that there are black and white rings on the surface of the scales, like annual rings on the cross-section of the tree.

Ao Qianpan said: "Just count the number of circles of black ring-shaped stripes on the scales and add one, that is the actual age of the fish. For example, three black circles on the scales, then the actual age of the fish is four years old."

Ao Wenchang said in surprise: "It turns out that there are really annual rings on the fish."

Seeing that he taught a lesson to a top student, Ao Qianpan felt proud and smiled and said, "Of course."

"I know the reason for the tree's long rings. Why does this fish have long rings?" Ao Wenchang asked strangely, "Uncle Qianpan, do you know the reason?"

This time, Ao Qianpan stopped asking. He blinked his eyes and thought for a while, and finally said helplessly: "Anyway, it has grown this thing, which is the same as the tree's long rings."

Ao Qianwen knew the reason and gave the answer with a smile: "Da Pan is right. The reason why this fish scale produces annual rings and the tree grows annual rings is mainly the periodic transformation of nature year after year. This fish scale is also called bone scales, which evolved from the dermis of the fish."

"In spring and summer, the water temperature is relatively high and the bait is rich in the sea. This is the peak season for fishes. They grow faster, the skin develops faster, and the scales grow faster, so that the rings between the circles are wider."

"When autumn and winter begin, the water temperature drops and food decreases, and the growth of fish will slow down? In this way, the growth of scales will definitely slow down, and the rings between the circles will be narrower, so that annual rings will appear."

Ao Qianpan nodded and said, "Yes, Brother Wen is right. The annual rings on these scales are wide and narrow, which means one summer and one winter."

Ao Qianwen is an old driver at sea and knows a lot.

He said to Ao Muyang: "Don't look at the fish without saying anything, in fact, you can tell that there are many things on the fish through observation. There are several ways to guess the age of the fish. Some methods are not applicable to some fish, so you have to change to other methods."

"The age of the fish can be calculated from the number of concentric circles on the scales. If the scales are not clear, you can also use the age of the fish to guess based on the spine, gill skull, dorsal fin, otolith, etc.."

"For example, flounder can use spinal bones to calculate age, salmon can use gill skulls to calculate age, sharks can use shark fins to calculate age, and small yellow croakers can use otoliths to calculate age."

After hearing that he said so much in one breath, Ao Muyang felt very novel and said, "How to calculate through these parts?"

Ao Qianwen said: "Same, these parts of these fish will also have the same annual rings, and the appearance will be clearer."

Ao Muyang smiled and said, "Learn from the world, knowledge is knowledge, and understanding human feelings is articles. We younger generations have a lot to learn."

When he said this, Ao Qianwen's face was shining.

However, he shook his head and said, "In fact, learning this thing is not very useful. If you understand too much, you may not be able to catch fish. You still have to rely on your ability to lead the dragon."

Ao Wenchang carefully counted the number of black pattern circles on the fish scales, and there were thirty-seven circles in total, which means that the fish was thirty-eight years old.

The bungee was not very big. They came back one night and put away the net. The fishing net was dragged in a mess, with a total of fourteen big fish hanging on it!

In addition, there are other fish that are hooked. This place is indeed full of fish, and there is a yellowfin tuna hanging on it.

It is unexpected to catch tuna, but it is reasonable that the longline fishing they arranged was originally used to catch tuna.

In addition, there are other fish. Longline fishing includes large hooks and small hooks. Large hooks are used to catch large fish such as tuna, and small hooks can catch some small fish.

Among the dragon packers caught this time, the largest one was 2.15 meters long. Ao Wenchang counted the number of circles on the scales, and there were 48, which means that the fish is almost fifty years old!

After putting away the fishing net, they got off the net again, but the harvest was not great. They did not catch any dragon bands on the net, only some common South China Sea fish such as sea catfish, big-eyed bream, herring carp.

It has been four or five days since the last time I replenished freshwater on the island, and the big dragon number needs to increase the supply again.

There are still some fresh water, but there are very few foods and ingredients, so you need to find a transit station to replenish it.

The supply island chosen by Ao Daguo is Golden Monkey Island, which is one of the few islands in the South China Sea with residents.

After driving to the north against the wind for a while, an island appeared in their sight.

This island is much larger than the small island they have been to before, with an area of ​​nearly one square kilometer. For the small islands scattered on the South China Sea, this area is already very large.

From a distance, the island is covered with forests, like a green jade bead embedded in the vast sea, extremely beautiful.

Compared with other sea areas, boats become lively when they arrive here. Many ships come to the island to replenish supplies, including fishing boats, yachts, transport ships and cargo ships, and even a warship.

Seeing the narrow warship slowly passing by, the group took out their cell phones to take photos.

Ao Muyang went up to look at the photos he took, then shook his head: "What era is it? Smartphones are everywhere, and are you still taking photos with landlines?"

There was a pier extending out on the island, and Ao Daguo leaned on the big dragon's number one, and he went to pay the mooring fee, and Ao Muyang took the others ashore.

Golden Monkey Island was originally called Jinshan Island. It is said that fishermen saw a Jinshan Mountain from afar on the sea. After sailing to arrive, they discovered the island.

Later, about fifteen years ago, relevant state units discovered that the island environment was very suitable for raising monkeys, so they stocked more than ten macaques here. In just a few years, the macaque group expanded and a race was reproduced.

Therefore, the island was renamed Golden Monkey Island. Today, there are not only macaques on the island, but also many kinds of monkeys such as short-tailed monkeys and golden-snops.

There are towns and residents on the island. This is the largest sea supply station around, and residents make a living by providing services to passing ships.

Pedestrians are bustling on the small pier. Walking out of the pier is a market with some fruits and side dishes. The residents of the dark-skinned island waved enthusiastically:

"Authentic local coconut, so sweet and sweet, buy two to try."

"Stinky tofu, old sausages, authentic foods transported from southern Hunan are delicious and affordable."

"Accommodation? There are air conditioning, fans and iced Coke. Except for the lack of little sister, we have everything in the hotel. The IFI signal is absolutely full..."

There are many people selling things on the island, but the price is not cheap. Ao Mubing went to ask about the price of coconut, and one cost 120 yuan.

Seeing these people, they were shocked: "Forget it, let's go to a restaurant to have a drink of cold water. The price is simply a slaughter!"
Chapter completed!