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Hammerhead shark as electrometer front end
Gyro:
--- Quote from: Alex Eisenhut on May 19, 2021, 03:47:33 pm ---Don't know about 1nV per meter... but
https://en.wikipedia.org/wiki/Ampullae_of_Lorenzini
"Sharks may be more sensitive to electric fields than any other animal, with a threshold of sensitivity as low as 5 nV/cm"
--- End quote ---
From the link, it looks as if Hammerheads have Geomagnetic sensing too. Given that they already have inherent biological accelerometers and gyroscopes, the only thing they're missing is GPS!
bsfeechannel:
--- Quote from: Gyro on May 19, 2021, 10:56:30 am ---
--- Quote from: bsfeechannel on May 19, 2021, 12:15:06 am ---The only way to be sure is to connect a 1.5V battery between Long Island Sound and the waters of Florida and see if it detects it.
--- End quote ---
Given the number of boats and ships around with sacrificial anodes, I think it would have a hell of a job.
I suspect that its response is low frequency AC rather than DC too. You don't want a hammerhead with uncontrolled drift!
--- End quote ---
I guess they used that comparison in order to demonstrate the orders of magnitude involved to a lay audience. But if you have seen a hammerhead shark hunting, it searches for prey hidden in the sand, maintaining its receptors at a distance of no more than 10cm above the sea bed. These sharks know how to avoid interference.
--- Quote from: Alex Eisenhut on May 19, 2021, 03:47:33 pm ---Don't know about 1nV per meter... but
https://en.wikipedia.org/wiki/Ampullae_of_Lorenzini
"Sharks may be more sensitive to electric fields than any other animal, with a threshold of sensitivity as low as 5 nV/cm"
--- End quote ---
I think the OP's video got it wrong. They say 1nV/cm², however electric fields are expressed in V/m, not V/m². There's another video which claims that the receptors are capable of sensing 15nV of potential difference, regardless of distance.
cdev:
That hammer head sure looks like an antenna or similar to me. this is pretty interesting. I am not a shark or even close. But I can sense small electric currents with my mouth.
chickenHeadKnob:
--- Quote from: cdev on May 20, 2021, 02:10:19 am ---. I am not a shark or even close. But I can sense small electric currents with my mouth.
--- End quote ---
This sounds impractical to me, if you try this at work.
Refrigerator:
--- Quote from: cdev on May 20, 2021, 02:10:19 am ---That hammer head sure looks like an antenna or similar to me. this is pretty interesting. I am not a shark or even close. But I can sense small electric currents with my mouth.
--- End quote ---
We've all licked a 9V battery.
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