My Deep-sea Fishery

Nowadays, the costin is really rare, even rarer than the giant panda. At one time, some people thought that the costin was extinct long ago, and some people even thought that there was no creature like the costin on the earth. It is believed that Costin is a fictional totem in literary works and film and television dramas. Like a dragon, it is a totem that only exists in imagination.

It was not until more than ten years ago that a biological expedition team in my country discovered Costinin twice in Honghe Nature Reserve in Heilongjiang, which filled the gap in the specimens of Costinin and made people believe again that there is Costininosaurus. At present, my country has listed costin as the first class of protected animals in the country.

Sit in prison and wear green.

Gold medal green from death.

The yellow mantle brand is green.

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

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

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

"Strange." Professor Chen Yu stared at the tiger-headed sea eagle hovering in the sky, as if he was thinking about something.

"What's the matter? Teacher, did you find anything?" Xiang Yang asked.

Professor Chen Yu shook his head, "It's not found, but as far as I know, the breeding season of Steller's sea eagles is in the alternating seasons of spring and summer every year, and usually two to three eggs are laid. This season is a bit wrong."

Steller's sea eagle is not as rare as costin, but it is definitely not a common bird.

Steller sea eagles are standard monogamous, and usually only two eggs are laid per brood.

The eggs are white with green tints and hatch for up to forty-five days. The chicks grow very slowly, and when they hatch in May and June every year, 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.

It takes at least two months for a tiger-headed sea eagle to grow its wings. During these two months, the tiger-headed sea eagle is very fragile. Basically, it only needs a gust of sea breeze and a heavy rain to take away the small tiger-headed sea eagle. The life of the eagle.

Even after growing feathers, Steller's sea eagles are still very fragile. At that time, their bones were soft, and there were almost no means of attack. It took them about ten months to leave the eagle's nest and start learning to fly. Learn the art of hunting.

Moreover, the tiger-headed sea eagle is not like Hai Dongqing who can fight a fox at the age of three, or catch a dog at the age of five.

It takes four to five years for a Steller's sea eagle to become officially 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 is considered to have officially entered the stage of adult bird.

However, the lifespan of a tiger-headed sea eagle in the wild is only 20 years, generally no more than 25 years.

Some biologists have measured the survival rate of small Steller sea eagles to adults and found that it is less than 30%.

What does that mean?

This means, assuming that a couple of tiger-headed sea eagles have only two eggs per child, they need to reproduce at least three times in a short period of twenty years in order to completely pass on the family and ensure that their race will not survive. Extinct, and Steller's sea eagles before the age of five are unable to reproduce,

This is a very fragile race.

"It's not surprising." Fang Youqun said carelessly: "The reproductive period is the alternation of spring and summer. You have to get married before giving birth, right? Courtship first a few months before giving birth, which is in line with the law of love."

Xiang Yang raised his eyebrows, but said nothing.

In fact, Xiang Yang is more inclined to believe that temperature and food factors affect the courtship period of tiger-headed sea eagles.

Steller's sea eagles mainly inhabit coasts and river valleys, and sometimes enter inland areas far from the sea along rivers.

The several breeding areas of Steller sea eagles discovered by biologists before are all in cold areas above 3,600 meters above sea level.

How cold it is in that place.

Although Xiang Yang's ocean-going fishing boat is always moving, no matter how it moves, it is still moving near the equator. How warm is the temperature at the equator?

As for the food?

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

With a suitable temperature and sufficient food, it is not surprising that the Steller's sea eagles will enter the breeding season early.

Not enough Xiang Yang is still a little worried, he told Professor Chen Yu his guess, and then said: "Teacher, I am actually a little worried now, these two kinds of tiger-headed sea eagles have entered the breeding season early in violation of natural conditions , will it cause the eggs to fail to hatch, or the baby birds to be born deficient or something like that?"

Professor Chen Yu thought carefully for a moment, then waved his hands, shook his head and said: "No, the breeding season of animals is not fixed, just like lions on the prairie, they usually start to breed when the rainy season begins. offspring, but some lion groups that occupy water sources all the year round actually reproduce offspring all year round. The most important factor affecting animal reproduction is whether food is sufficient. As long as these two tiger-headed sea eagles have sufficient food, I think they It can be reproduced.”

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

Xiang Yang smiled dryly, "It's too early to say this. Although tiger-headed sea eagles are standard monogamous, they are highly social creatures that live in groups. Are these two tiger-headed sea eagles going to live together?" It’s not necessarily about reproduction.”

The Steller's sea eagle is the largest raptor in the sky over the bay, and it is also the largest eagle species recorded in the Guinness Book of World Records. However, they often gather together to hunt in groups of a few or a dozen. This habit is similar to that of sparrows and swallows. Somewhat similar.

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

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

In mid-air, the soaring giant Steller's sea eagle was still circling at low altitude. Its flight speed was very slow, and it hardly flapped its wings, and it was always in a gliding state.

From time to time, it opened its sharp eagle beak and made a deep and hoarse "chirp chirping" sound. The sound was like a metal synthetic sound, very penetrating, and could directly shake people's eardrums. This was the only sound Xiang Yang had ever heard. The loudest animal cry other than whales can remind Xiang Yang of the roar of a tiger.

Although the cry of the tiger-headed sea eagle is completely different from the hoarse bark of the tiger, there is an indescribable similarity in it. In short, it can make people know that it is made by a very, very ferocious beast. The sound that came out.