41–50 of 64 posts
Earlier quoted context omitted.
You sure that wasn't a tiger pistol shrimp? Mantis shrimp are exotic terrors of the deep you don't exactly forget you have.
After doing a bit of research I think you're right. For some reason I got them confused.
You usually have to special-order mantis shrimp. It's easy to accidentally get a pistol shrimp when you asked for a peppermint; they look similar.
"produces sounds that exceed 140 decibels" is a nonsense statement. They probably meant dBSPL.
Pedantic nitpick: it's not nonsense if the common person understands the meaning. Your average english speaker uses "decibels" to mean "dBSPL" since most people aren't aware of the other ones.
Sound pressure level measurements relate to the pressure at a point in space, and do not relate -- by themselves -- to the total sound energy being produced by a thing.
I can make an SPL measurement, in air, that is ~6dB higher or lower by halving or doubling (respectively) the distance betwixt the thing making the sound and the thing measuring the sound.
If a sound measures 100dB at a distance of 2 meters, then the same sound also measures 106dB at a distance of 1 meter, or 112dB at 0.5 meters, or 118dB at 0.25 meters.
A difference of 18dB is a difference of nearly two orders of magnitude.
The study says this fish made a sound at a level of 140dB at a measurement distance of one fish length of 12mm, in water.
To compare a 140dB fish-noise that to a the SPL of a gunshot, we'd first need to measure a gunshot -- in water -- at a distance of 12mm (or extrapolate for a larger distance).
And I have certainly not done this measurement myself, but I strongly suspect that the intensity of the gunshot will blow the noise of this fish out of the water in an an apples-to-apples comparison.
Earlier quoted context omitted.
I only knew that I had one in my tank because I would hear the loud "crack" at night. Luckily it was the shrimp making the noise, not the glass breaking. Months later when I drained the tank to move into a new house, and removed all the live rock I found it dead at the bottom. Amazing that such a tiny thing can make so much noise.
You sure that wasn't a tiger pistol shrimp? Mantis shrimp are exotic terrors of the deep you don't exactly forget you have.
Yep. Any fish you put in the tank would disappear soon after.
Mantis Shrimp can punch as hard as a bullet, can break aquarium glass and can create a cavitation bubble hotter than the sun.
Relevant neat video of Mantis Shrimp breaking glass, albeit thin test tubes: https://www.youtube.com/watch?v=nSRahhMdfxM
Seems like very misleading science reporting. It relies on the wow factor of a 12mm fish producing a sound as loud as what many people would associate with a jet engine (>140db). - Sound levels are usually assumed to be measured 1m away. For the fish, it’s measured one body length away (inverse square law applies) - Jet engines are often measured from many meters away (again inverse square law) - The fish’s sound is…
The article compares it to a sledgehammer, ambulance siren or a gunshot. A gunshot of which is not a continuous sound.
Regardless, it is impressive that a 12mm fish can produce such a loud sound regardless of whether it is continuous and/or throughout our frequency range of hearing.
Seems like very misleading science reporting. It relies on the wow factor of a 12mm fish producing a sound as loud as what many people would associate with a jet engine (>140db). - Sound levels are usually assumed to be measured 1m away. For the fish, it’s measured one body length away (inverse square law applies) - Jet engines are often measured from many meters away (again inverse square law) - The fish’s sound is…
I don't think so and I don't see any mention of it being compared to a jet engine. The article compares it to a sledgehammer, ambulance siren or a gunshot. A gunshot of which is not a continuous sound. Regardless, it is impressive that a 12mm fish can produce such a loud sound regardless of whether it is continuous and/or throughout our frequency range of hearing.
140dB at 12mm is equivalent to 100db at 1000mm. So that's 20dB less than an "ambulance" or "jackhammer" as listed here[0]. Which definitely would make the article misleading.
0: https://noiseawareness.org/info-center/common-noise-levels/
Seems like very misleading science reporting. It relies on the wow factor of a 12mm fish producing a sound as loud as what many people would associate with a jet engine (>140db). - Sound levels are usually assumed to be measured 1m away. For the fish, it’s measured one body length away (inverse square law applies) - Jet engines are often measured from many meters away (again inverse square law) - The fish’s sound is…
[flagged]
It’s always disappointing to me when articles describing a sound don’t include an audio clip. Someone must have a hydrophone recording!
Earlier quoted context omitted.
I don't think so and I don't see any mention of it being compared to a jet engine. The article compares it to a sledgehammer, ambulance siren or a gunshot. A gunshot of which is not a continuous sound. Regardless, it is impressive that a 12mm fish can produce such a loud sound regardless of whether it is continuous and/or throughout our frequency range of hearing.
It really does matter how far away the sound measurement is taken. 12mm vs. 1000mm away is not trivial for this "decibel" number to make any sense, contextually. 140dB at 12mm is equivalent to 100db at 1000mm. So that's 20dB less than an "ambulance" or "jackhammer" as listed here[0]. Which definitely would make the article misleading. 0: https://noiseawareness.org/info-center/common-noise-levels/