my golden fishing village

Chapter 38 Another one!
The first is indiscriminate fishing.

The development of globalized fishery has brought unprecedented fishing intensity and breadth. It can be said that as long as there are fish, there will be more and more modern fishing tools and means.

Although there are more environmentally friendly fishing techniques, traditional methods can still be seen everywhere, bringing catastrophe to dolphins all over the world. They intend to catch fish, but dolphins are accidentally caught from time to time. All the fish and small fish were caught in the net, and the dolphins could only watch helplessly as their food became a human meal.

even!In parts of Japan, South Asia, Southeast Asia, Africa, and South America, hunting dolphins has been a constant custom for thousands of years.

According to statistics, within 90 days after being captured, 53% of the dolphins died in depression. The average natural life span of dolphins is 45 years, but half of the captured dolphins died within two years after being captured, and their average life span is, It is only 5 years; in the artificial environment, dolphins are extremely susceptible to diseases such as pneumonia and enteritis, and they will not survive seven years due to chlorine poisoning and long-term depression and panic.

In addition to overfishing, environmental pollution is also one of the reasons for the death of a large number of dolphins.

Human beings recklessly dump all kinds of domestic garbage, industrial waste water, pesticide pollution and oil field waste into the ocean and rivers, which has made the originally clear ocean turbid, and large-scale accidents such as oil spills occur from time to time. It is to further deteriorate the marine environment.

In densely populated waters along rivers and rivers, eutrophication and heavy metal pollution have threatened the living environment of aquatic organisms, and the proliferation of toxic algae has also made the waters here dangerous. Even dolphins at the top of the food chain have serious damage to their reproductive and immune systems. The death rate also increased significantly.

In 1987, hundreds of dolphins on the coast of New Jersey in the United States died tragically due to immune system dysfunction caused by a red tide, and their bodies were covered with abscesses. It is shocking and chilling.

Hearing is the most sensitive sense of dolphins, predation, swimming and play, all rely on hearing.

All kinds of underwater engineering equipment and ships of various sizes that come and go day and night not only disturb the life of dolphins, but also "collisions" between dolphins and ships occur from time to time. The "noise pollution" of these human activities also makes dolphins unbearable. Impaired, out of control behavior, increased stress, abnormal life habits.

In many river basins, building dams, repairing fishing grounds, constructing flood control projects, and extracting water resources have become commonplace behaviors.The living environment of dolphins has been artificially changed, and various projects have been built to prevent dolphins from migrating and other activities.The baiji dolphin was once a treasure that China was proud of, but the completion of Gezhouba has more or less accelerated its disappearance quietly.

Not to mention, global warming, climate change, and sea-level rise have caused changes in the ecological environment, such as precipitation, water temperature and salinity. In particular, the water temperature in some coastal areas has risen by 3-4 degrees Celsius in just half a century. The dolphins are overwhelmed and at a loss.

It can be said that in just a few short decades, the water paradise where they used to swim happily has become besieged by all sides and is in danger.

And the culprit of everything is undoubtedly human beings...

Except for the dolphins in the aquarium, it is really not easy to see a dolphin in the wild.

Chen Fan stroked the little dolphin carefully, and his heart was full of satisfaction. It would be great if one day, dolphins could appear in the waters outside.

Suddenly, the little dolphin, who had been enjoying silently, suddenly turned around, as if talking about something.

Chen Fan turned his head curiously, only to see a black shadow cruising quickly, and soon arrived in front of him.

It's a female dolphin!

Compared with the one-meter length of the baby dolphin, the female dolphin is nearly three meters long, and she is all white, which is very beautiful.

The little dolphin opened its mouth and seemed to be saying something. Most of the sounds made by the creatures in the ocean are inaudible to human ears, not because they can't make sounds.

The ocean is actually a noisy and noisy world.

Animals of all kinds, from shrimps to whales, called to and fro.

People can use listening submersibles to eavesdrop on the sounds under the sea: some are like the camping sounds of bees, others are like clucking hens, chirping and rattling like birds; There are crackling sounds, clucking sounds like frogs, chirps like insects, and squeaks like rats; there are also drums, grinding, pigs, dogs snorting, whistles, etc.

Some fish, as if they were trying to hide it on purpose, immediately became quiet and silent whenever they swam by the boat or people shone a light on them.

Plus, surprisingly, fish sounds make sense.

Some expressed anger, others expressed alarm, and some expressed readiness to fight.

There are great differences in the tones of these calls, but the vibration frequency of most calls is between 75 and 26 times per second.Of [-] different species of vocalizing fish, only three had pitches that increased in frequency to more than [-] vibrations per second.The roar of the anglerfish living in the waters off the Bahamas has a pitch of [-] vibrations per second, which is very similar to the standard human scream.

Whales are the best "ventriloquist" experts in the ocean kingdom. They can make hundreds of sounds, and the sounds they make are varied, which is amazing. Scientists conducted live underwater recordings at the whale resort in the estuary delta. The result is Much beyond people's imagination.They actually heard the roar of beasts, the lowing of cows, the snoring of pigs, the neighing of horses, the squeaking of birds, the screaming of women, and the crying of babies... It was all kinds of things, all kinds of wonders.Whales can also make hinge sounds, bell sounds, steamboat sounds, and more.

This non-stop "singing" behavior of whales is actually entertaining themselves, and it is also a kind of communication between companions, which is an important part of their summer vacation.

The whales appeared very excited when they entered the mouth of the river. Although they had traveled a long distance, they did not seem to feel tired at all.In addition to constantly "communicating" with different voices, he also uses his large caudal lobe to play in the water, half of his body out of the water, and his posture is very beautiful. Tourists are scrambling to take this precious shot.Whales can also play with various "toys".

A piece of wood, a piece of seaweed, or a stone can be their game objects.They can carry a long piece of seaweed, dive for a while, and float up for a while, making cheerful sounds from their mouths.Sometimes they are fascinated by a stone the size of a basin. First, they use their mouths to overturn the stone to play, and then jump out of the water with the stone in their mouth. What's more, they will put the stone on their heads and perform on the water like an acrobat. .

The dolphin's call is high-frequency, while that of the blue whale is low-frequency, and the language system of the dolphin is more complex and perfect, and can express more meanings, while the sound of the blue whale is relatively loud.

One thing they have in common is their calls, which humans cannot hear...

(End of this chapter)