My Deep-sea Fishery

Xiang Yang carefully looked at the red-crowned cranes above his head, while distinguishing their calls.

The pitch and frequency of red-crowned crane calls vary greatly depending on gender, age, behavior, and environmental conditions.

Generally, red-crowned cranes sing in series or single, not only when taking off and flying in the air, but also when they are feeding and perching on the ground.

Throughout the year, its chirping can be heard almost every day, but it is most frequent around dawn.

Every day before dawn, as long as there is one bird that starts to sing first, the second one will answer immediately, and then the group will echo each other in a series, and the laughter will continue until sunrise.

The calls of red-crowned cranes are not only used as a teaser and contact between spouses and group members, but also often used to express commotion and warning of danger, but more importantly, it is used as an accompaniment to the dance of the married couple.

When the breeding male bird sings with the female bird, its head is turned upwards, and its wings vibrate frequently, making a high and long single sound in one beat. The female bird also raises its head to the sky, but does not flap its wings. Two or three short shrill polyphony sounded in the beat.

This duet is not only the red-crowned crane's confession of love, but also a warning to intruders, and it can also promote the synchronization of male and female sexual behaviors and ensure the success of reproduction.

The chirping of the chicks is mainly about asking for food.

One-year-old chicks defend their territory and sing aimlessly after leaving their parents.

The red-crowned cranes after two years old will sing in unison and before mating.

In addition, there are calls for take-off and alarm calls, calls for nesting, and so on.

"Fang Youqun." Xiang Yang suddenly shouted.

"What's wrong? Brother Yang." Fang Youqun asked immediately.

Xiang Yang smiled and asked, "Have you ever watched Crane Dance?"

"Crane dance?" Fang Youqun wondered.

"If you haven't seen it, watch it carefully. After a while, these red-crowned cranes should be able to dance." Xiang Yang said with a smile.

Soon after the red-crowned cranes arrive at the breeding ground, they begin to pair up and occupy the nest area, and the male and female birds announce their possession of the domain through continuous singing in the nest area.

Courtship is also accompanied by singing, and often the male bird's beak is pointed upwards, his head and neck are raised, he looks up to the sky, his wings stand up, and he sings loudly, making a loud and clear sound of "heh, heh, heh".

The females echoed loudly, and then called, jumped and danced to each other.

The dancing posture of the red-crowned crane is very graceful, such as stretching its neck and raising its head, or bending its knees, or stepping on the spot, or jumping in the air, and sometimes throwing small stones or twigs into the air.

Most of the dances of red-crowned cranes are continuous changes of dozens or hundreds of movements.

The main movements of the dance include stretching the waist and raising the head, bending, jumping, jumping and kicking, walking with spreading wings, bending the back, bowing, holding objects, etc., but the postures, amplitudes, and speeds are different.

And these actions and their follow-up actions are all organically combined, such as bending down - stretching the waist and raising the head - the head swings up and down rapidly.

Spread your wings—stretch your waist and raise your head—bend your waist.

Stretch your head up -- bend down -- and jump with your feet down.

Stretch your wings and bend your waist - walk with your waist bent - your neck and body form a figure-eight shape and spread your wings to hold your objects - spread your wings and walk.

Holding object—jumping parabola—body rotation without displacement.

Red-crowned cranes can jump, bend and so on by leg strength or flapping their wings.

Most of these movements of red-crowned cranes have a relatively clear purpose, such as bowing generally expresses friendship and love.

The whole body is bowed and saluted with tension, which means to show one's own existence, show off, and intimidate.

Bending over and spreading wings means contentment, leisure and entertainment; wing spreading sometimes means cheerful mood, etc.

"Look carefully, there are very few chances to meet red-crowned cranes in the wild." Xiang Yang said with a smile.

The status of the red-crowned crane population is very miserable.

Red-crowned cranes need a clean and open wetland environment as their habitat, and are the most sensitive indicator organisms to changes in the wetland environment.

Due to the continuous increase of the number of humans, the habitat of red-crowned cranes is constantly changing into farmland or cities. For example, Moon Pao in the west of Jilin Province used to be a breeding ground for red-crowned cranes. Because people built embankments around the lake, the water level in the embankment rose, and the emergent plants were basically Disappeared, the floodplain of the lake outside the embankment dried up and was reclaimed as farmland, and the red-crowned cranes have since disappeared.

Another example is the marsh area between Shaobo Lake and Gaoyou Lake in my country, which used to be the wintering ground for red-crowned cranes. Due to the increasing number of people fishing, grazing and hunting in this area every year, human disturbance, egg picking, poaching, etc. have increased. The number of red-crowned cranes has decreased dramatically.

The total number of red-crowned cranes in the world is estimated to be only about 2,000, of which about 1,000 are overwintering in my country. More and more people are paying attention to protecting red-crowned cranes and their living environment.

my country has established more than 20 nature reserves mainly for the protection of red-crowned cranes, among which Xianghai, East Dongting Lake, and Poyang Lake have also been included in the list of protected wetlands under the international Ramsar Treaty. Great progress has been made in conservation work.

The red-crowned cranes on the sea are very difficult to see in other sea areas except for the hundreds of them that have stayed in the Hokkaido fishing ground for a long time for a long time.

This time, Xiang Yang drove a boat to the vicinity of Naha. This group of red-crowned cranes is probably the group of red-crowned cranes that have stayed in the Hokkaido fishing ground for a long time.

In the history of our country, the red-crowned crane is recognized as a first-class civil bird.

The Ming and Qing dynasties endowed red-crowned cranes with cultural connotations of loyalty, integrity and noble character.

The red-crowned crane embroidered by first-rank civil officials is listed as an important symbol second only to the dragon and phoenix dedicated to the royal family, so people also call cranes first-rank birds.

People also regard the crane as a symbol of high officials.

An auspicious picture of a crane standing on the rock at the head of the tide, which takes the homonym of tide and dynasty, symbolizes being a prime minister and ruling the dynasty.

The pattern of cranes flying in the clouds symbolizes "one-level promotion"; the pattern of cranes flying at sunrise symbolizes "sunrise and promotion".

In fact, the legendary crane is also a red-crowned crane. It is a large wading bird that lives in swamps or shallow waters. It is often dubbed the "God of Wetlands".

It has nothing to do with the pine trees that grow in the mountains and hills.

But because red-crowned cranes live up to fifty or sixty years, people often paint them together with pine trees as a symbol of longevity.

Residents in East Asia use red-crowned cranes to symbolize happiness, auspiciousness, longevity and loyalty.

It often appears in literature and art works of various countries. In the tombs of the Yin and Shang Dynasties, there are images of cranes appearing in sculptures.

Bronze bells in the Spring and Autumn Period and the Warring States Period, and ritual vessels in the shape of crane bodies have already appeared.

Xiang Yang was still admiring the group of red-crowned cranes. At this time, Chen Qingsheng's voice came again from Xiang Yang's walkie-talkie. Chen Qingsheng's voice was very helpless, "Boss, the sea fish in the fishing net is too tight. I'm afraid there is no way to do it." Put another rope in the fishing net, what should I do now? Should I just discard the net?"