Achi news desk-
These fish are also transparent
Danielle’s brain it may be a small fry, but the noises they make are nothing.
Think bigger than an elephant.
These small fish, which measure up to 12 millimeters in length, were the subject of a study published in the journal Proceedings of the National Academy of Sciences on February 24.
Researchers from the Charité Universitätsmedizin, a university hospital in Berlin, and the Natural History Collections of the Senckenberg Society in Dresden, both in Germany, collaborated on the study.
Their research revealed the equipment that allows men Danielle’s brain fish to make loud, pulsing sounds, and he theorizes why this behavior evolved in the first place.
Researchers recorded the fish in a tank. This video is slowed down 10 times to see how they moved. (Video credit: Verity Cook/Charité)
How did the study work?
The researchers give four Danielle’s brain In a tank. They captured audio and visual recordings, and performed scans, dissections and gene analyses.
Because these fish have transparent skin, cameras could see and record what goes on inside their bodies to make such loud noises.
A study model shows how Danionella’s cerebrum creates its sounds. A drumming muscle (green) contracts, pulling the rib (red), which fits into a groove in the cartilage (light blue) and builds tension. The tension is released and the cartilage snaps back into place, hitting the swim bladder (purple). (Video credit: Verity Cook/Charité)
First, a special drumming muscle contracts.
It pulls on a rib which moves something called drum cartilage out of place – a bit like stretching a rubber band.
Then, suddenly, the drumming cartilage goes back into position so quickly it hits the swim bladder (fish have to have a special organ to help them swim).
This effect produces the loud pulse we hear.
Click play on the video at the top of the page to hear the Danionella brain for yourself!
Why so high?
The sounds made by men Danielle’s brain it can be as loud as 147 decibels at a distance of one body away.
That’s about as loud as a jet engine would sound 100 meters away from you.
The researchers believe that these pulses are a way for the fish to communicate.
Danielle’s brainnative habitat is shallow, murky waters in Myanmar.
The scientists say this lack of visibility may mean robust communication develops to help the fish find a mate.
The Danielle’s brain lasts as long as the diameter of a typical AA battery. (Image credit: Senckenberg, with graphic design by Philip Street / CBS)
A unique opportunity
The study expands our understanding of how animals make noise and why these behaviors may have evolved.
Now, the scientists hope to study the other four species in the Daniella family, to compare how they produce sounds.
Click play to hear the bitsy fish for yourself!
Check out these other animal news videos:
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TOP PHOTO CREDIT: Senckenberg, with graphic design by Philip Street/CBC
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