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Hammerhead shark as electrometer front end
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fcb:
Does this sound right?  Hammerhead sharks can detect fields of around 1nV/M??

https://youtu.be/lgTbQlfOSKE?t=775

bsfeechannel:
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.
Gyro:

--- 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!
fcb:

--- 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 ---
Undoubtedly it will be tuned to pulses from muscles in prey, but that's still a hell of a front end, wonder what the bandwidth is, how it filters out noise and if there is a DC blinding effect?
Alex Eisenhut:
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"
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