[HN Gopher] One of world's smallest fish found to make sound as ...
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One of world's smallest fish found to make sound as loud as a
gunshot
Author : sandebert
Score : 128 points
Date : 2024-02-27 11:27 UTC (1 days ago)
(HTM) web link (www.theguardian.com)
(TXT) w3m dump (www.theguardian.com)
| ozfive wrote:
| All I want to know is, can you keep them in fish tanks without
| the glass shattering?
| jareklupinski wrote:
| sure, as long as you use bulletproof glass :)
| xrd wrote:
| Tampa Bay is having a lot of problems with noise
| (https://www.npr.org/2024/02/01/1228286349/south-tampa-myster...)
| that none of the neighbors can figure out. Some speculate on a
| party boat with speakers. Some are speculating is it the black
| drum fish (https://en.wikipedia.org/wiki/Black_drum) making loud
| noises when mating.
| ocal5 wrote:
| That's Daft Punk - Daftendirekt, actually.
| garyclarke27 wrote:
| Mantis Shrimp can punch as hard as a bullet, can break aquarium
| glass and can create a cavitation bubble hotter than the sun.
| 01HNNWZ0MV43FF wrote:
| Has NIF tried mantis shrimp?
| andrewflnr wrote:
| This is the closest I found, searching for "acoustic
| confinement fusion". Short story: probably doesn't work.
| https://en.wikipedia.org/wiki/Bubble_fusion
| pwython wrote:
| Relevant neat video of Mantis Shrimp breaking glass, albeit
| thin test tubes: https://www.youtube.com/watch?v=nSRahhMdfxM
| decafninja wrote:
| It's a biological plasma cannon
| HeyLaughingBoy wrote:
| 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.
| jstarfish wrote:
| You sure that wasn't a tiger pistol shrimp?
|
| Mantis shrimp are exotic terrors of the deep you don't
| exactly forget you have.
| HeyLaughingBoy wrote:
| After doing a bit of research I think you're right. For
| some reason I got them confused.
| jstarfish wrote:
| They're one of two shrimp associated with the tapping
| noise, so it's an easy mistake.
|
| 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.
| suzzer99 wrote:
| Mantis shrimps are show-offs. They hog all the records.
| WhitneyLand wrote:
| 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 pulsed and lasts only 2.5ms, while jet
| engine noise is continuous.
|
| - The frequency emitted by the fish "exceeds 20kHz". The
| frequency range of a jet engine spans almost the entire range of
| human hearing.
|
| - Standing next to one might startle you a bit, the other will
| irreversibly damage you.
| kdfjgbdfkjgb wrote:
| "produces sounds that exceed 140 decibels" is a nonsense
| statement. They probably meant dBSPL.
| huimang wrote:
| 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.
| ssl-3 wrote:
| It's still nonsense and devoid of meaning, and the nonsense
| has nothing to do with the unit presented or any
| simplification of that unit.
|
| 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.
| paulrpotts wrote:
| It's always disappointing to me when articles describing a sound
| don't include an audio clip. Someone must have a hydrophone
| recording!
| qup wrote:
| There was a video with audio.
| dang wrote:
| [stub for offtopicness]
| shireboy wrote:
| It must be a fundamental law of nature that the organisms with
| the smallest brains are the loudest.
| xeornet wrote:
| I think you may be onto something here.
| heroku wrote:
| evolution is a lie this proves.
| agilob wrote:
| Ok, but what if we feed the fish 500 l of jet fuel?
| mewpmewp2 wrote:
| Jet fuel can't melt fish scales.
| dxgray wrote:
| Mr. Limpet?
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