Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

Why do catfish have mustaches? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Comments on the article Comments on the article

Did you know?

Why do catfish have mustaches?

Catfish may ask you a counter question: "Why do you call them "whiskers"? It's not a mustache at all!" These processes, of course, resemble a cat's whiskers, which is why the fish is sometimes called cat-fish. In fact, these are antennae or probes, with the help of which the catfish learns what is happening around.

The fish has another feature that resembles a cat: when caught, it makes a buzzing or croaking sound, vaguely similar to the purring of a cat. Boys are especially familiar with catfish because it is one of the easiest fish to catch. She grabs any bait, from a piece of red string to a worm. And since catfish always take great care of their offspring and protect their nest, they multiply in huge numbers.

The catfish family has about 2000 different species. The European catfish reaches a length of 3 meters, and its weight is up to 180 kilograms. In Mississippi and the Great Lakes, some species weighing up to 68 kilograms are found. Many catfish are very tasty, especially the white catfish, which is found in the waters of the Chesapeake Bay and the Potomac River; blue catfish found in southern rivers; sculpins. Some catfish have rather strange habits.

One of the South American species has the habit of traveling overland from pond to pond, and the catfish of another species builds a nest of grass stalks for its offspring. In Africa, there is even an electric catfish that can deliver a significant electric shock. In the Nile there is a catfish that escapes the sight of its enemies by swimming with its black belly up and its white back down!

Author: Likum A.

 Random interesting fact from the Great Encyclopedia:

What famous musician played on the subway and people showed almost no interest in his music?

On January 12, 2007, one of the best violinists, American Joshua Bell, agreed to take part in the experiment - in the morning for 45 minutes he played in the lobby of a metro station under the guise of an ordinary street musician. Out of a thousand people who passed by, only seven became interested in music.

 Test your knowledge! Did you know...

▪ Why are Cepheids called the beacons of the universe?

▪ What is the Decameron?

▪ How does the culture of Western countries develop in the second half of the twentieth century?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Qnap TS-251A and TS-451A NAS 27.08.2016

Qnap introduced the TS-251A and TS-451A NAS, equipped with a USB QuickAccess port. In fact, this is a regular USB 3.0 Micro-B connector, with which the storage can be connected to a PC for data exchange, bypassing a wired LAN. In this mode, data exchange rates up to 100 MB / s are supported, although with the aggregation of the two available Gigabit Ethernet ports it is even higher - up to 211 MB / s.

NAS Qnap TS-251A and TS-451A received a USB QuickAccess port for direct connection to a PC
The basis of the new Qnap storages was the dual-core SoC Intel Celeron N3060, operating at up to 2,48 GHz. There are two slots for DDR3L RAM, the maximum total amount is 8 GB, and the regular one is 2 or 4 GB. Proprietary OS QTS 4.2.2 recorded on a flash drive with a capacity of 4 GB. The Qnap TS-251A and TS-451A models received two and four slots for 3,5-inch drives with a SATA 6 Gb / s interface.

Thanks to the SoC used, there is an HDMI video output with support for a resolution of 3840 x 2160 pixels (30 Hz), audio passthrough and multimedia shell control are supported using the included remote control. There are three USB 3.0 ports and an SD card reader.

It supports data encryption using the AES algorithm with a 256-bit key, virtualization of various operating systems, including Ubuntu 14.04 and 16.04, the creation of a personal cloud with file synchronization, and the launch of a video surveillance station.

Other interesting news:

▪ Samsung WB2200 60x optical zoom camera

▪ mechanical dragonfly

▪ Irregular pulsars

▪ Invented fabric that mosquitoes won't bite through

▪ The appearance of the child can be edited at the gene level

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ section of the site Electrician's Handbook. Article selection

▪ article Taxes and taxation. Lecture notes

▪ article What is the danger of using dihydrogen monoxide? Detailed answer

▪ article by Aroniy Michurin. Legends, cultivation, methods of application

▪ article Antenna amplifier of the range of 2 meters. Encyclopedia of radio electronics and electrical engineering

▪ article Transistor power amplifiers for 144 and 430 MHz bands. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

Name:


Email (optional):


A comment:





All languages ​​of this page

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua

www.diagram.com.ua
2000-2024