My Deep-sea Fishery

Nowadays, Costin is really rare, even rarer than giant pandas. At one time, some people thought Costin was already extinct. Some people even thought that there was no such thing as Costin on the earth. They It is believed that Costin is a fictitious totem in literary works and film and television dramas. It is a totem like a dragon and only exists in imagination.

It was not until more than ten years ago that a biological expedition team in China discovered Proteas twice during an investigation in the Honghe Nature Reserve in Heilongjiang. This filled the gap in the specimens of Proteas and made people believe that there is Protea At present, my country has listed Costin as the first-class protected animal in the country.

Sit down in prison.

Free of death gold medal.

Yellow jacket brand green.

These are all manifestations of Costin’s identity and value, and they are not enough to explain Costin’s rarity.

If you really want to sum up the preciousness of Costin in one sentence, Xiang Yang feels that only this sentence can sum up.

"This is a living beast, a living totem."

"It's weird." Professor Chen Yu stared at the tiger-headed sea eagle hovering in the sky, as if thinking about something.

"What's wrong? Teacher, have you found anything?" Xiang Yang asked.

Professor Chen Yu shook his head, "I found no, but as far as I know, the breeding period of Steller's sea eagles is in the alternate spring and summer seasons each year. Generally, they lay two to three eggs. This season is a bit wrong."

Steller's sea eagles are not as rare as Proteas, but they are definitely not a common bird.

Steller's sea eagles are standard monogamous, usually only two eggs per litter.

The color of the eggs is white, slightly decorated with green, and the incubation period is as long as forty-five days. The chicks grow very slowly. The young birds hatch in May and June each year, and their down feathers are gray or white.

During the growth period, the down feathers on the steller's sea eagle will slowly turn into brown feathers.

A tiger-headed sea eagle needs to spend at least two months to give birth to its wings. In these two months, the tiger-headed sea eagle is very fragile. Basically, it only needs a gust of sea breeze and a heavy rain can take away the little tiger’s head sea. The life of the eagle.

Even if they grow feathers, the steller's sea eagles are still very fragile. At that time, their bones were soft, and there were almost no attack methods. It took them about ten months to leave the eagle’s nest and start learning to fly. Learn the skill of hunting.

And unlike Hai Dongqing, the Steller's sea eagle can fight a fox at the age of three, and can take a dog away at the age of five.

It takes four to five years for a Steller's sea eagle to begin to be formally independent.

It will take ten years for the little tiger-headed sea eagle to formally grow the feathers of an adult bird, and at this time it will be considered as an adult bird.

However, the lifespan of a steller's sea eagle in the wild is only twenty years, generally not more than twenty-five years.

Some biologists have measured the survival rate of tiger-head sea eagles to adult birds, and found that it is less than 30%.

What does that mean?

What this means is that if a couple of tiger-headed sea eagles have only two eggs per litter, they will need to reproduce at least three offspring in a short period of 20 years in their lives. Is extinct, and the Steller’s sea eagle before the age of five cannot reproduce,

This is a very fragile race.

"This is not surprising." Fang Youqun said with a grin: "The reproduction period is the turn of spring and summer. You must get married before giving birth? Courting a couple months before giving birth is in line with the law of love."

Xiang Yang raised his eyebrows and said nothing.

In fact, Xiang Yang is more inclined to influence the courtship period of Steller's sea eagles because of temperature and food factors.

Steller's sea eagles mainly inhabit the coast and river valleys, and sometimes follow the river into the inland areas far from the sea.

Several breeding areas of Steller's sea eagles discovered by biologists are in cold areas above 3,600 meters above sea level.

How cold is the temperature in that place.

Although Xiangyang’s ocean-going fishing boat is always on the move, no matter how it moves, it moves near the equator. How warm is the temperature at the equator?

As for the food?

Xiang Yang said bluntly that this tiger-headed sea eagle ate more than Xiang Yang himself.

With the right temperature and sufficient food, it is not surprising that the Steller's sea eagle will enter the breeding period early.

Not enough, Xiang Yang was still a little worried. He told Professor Chen Yu about his guess, and then said: "Teacher, I am actually a little worried now that these two species of Steller's sea eagles have entered the breeding period earlier under the circumstances of violating natural conditions. , Will it cause the bird's eggs to fail to hatch, or the young birds are congenital insufficiency?"

Professor Chen Yu pondered for a moment, then waved his hand and shook his head: "It's not that the breeding season of animals is not fixed, just like the lions on the prairie. They usually start to multiply at the beginning of the rainy season. Descendants, but some lions that dominate water sources all year round actually reproduce offspring throughout the year. The most important factor that affects the reproduction of animals is whether there is sufficient food. As long as these two tiger-headed sea eagles have sufficient food, I think they It can reproduce offspring."

"Even if the natural conditions are not good, aren't we still here? How advanced is the artificial incubation technology now?" Professor Chen Yu said with a smile.

Xiang Yanggan smiled, "It's too early to say this. Although the stigmata sea eagles are standard monogamous, they are social creatures with high sociality. Do these two stalwart sea eagles want to It’s not necessarily true that there will be offspring."

Steller's sea eagle is the largest bird of prey in the sky in the bay and the largest eagle recorded in the Guinness Book of World Records. However, there are often a few or more than a dozen of them to hunt together~www.readwn.com~ Sparrows, swallows and the like are somewhat similar.

During the day, Steller's sea eagles will gather together to hunt, fight for food, and rest together. At night, they will return to their nests separately, prohibiting other species from entering their territory.

"Look." Professor Chen Yu looked up at the sky.

In mid-air, the huge tiger-headed sea eagle that soars with its wings is still hovering at low altitude. Its flying speed is very slow, it has hardly stirred its wings, and has been in a state of gliding all the time.

From time to time, it also opens its sharp olecranon and makes a deep and hoarse "chirp" sound. The sound is like a metal composite sound, which is very penetrating and can directly shake people's eardrums. This is what Xiang Yang has heard. The loudest animal sounds other than whales can remind Xiang Yang of the roar of a tiger.

Although the call of the steller sea eagle is completely different from the rough bark of the tiger, it sounds like it has an inexplicable commonality. In short, it can be heard to make people know that this is a very, very fierce beast. The sound coming out.

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