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Old 09-06-2013, 08:30   #16
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John, I too have a similar noise to yours, I would describe mine as a crackling sound, a bit like rice crispies. I checked everything, from the electrics, to water running from a leaky tank, and yes I even thought it might be the keel about to fall off. My smart son, just home on the boat from college, googled for a short time and came up with the answer, Snapping or Pistol Shrimp. Here in San Diego they are widespread as they are worldwide. They "shoot" a air bubble from one oversized claw to stun prey. The US Navy says they are responsible for a large amount of the background noise in the worlds oceans. So maybe this is what you are hearing.
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Old 09-06-2013, 08:59   #17
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Re: Tapping, Knocking Sound from bottom of Hull

the tropical banging sound differs from the clicking sound--the clicking have been known to be krill, crabs, and other sea life growing and feeding.
there is a fish with a hard head, locals call it a toro fish--it will hiunt fishlets up next to th eboat hull and catch the fish by ramming your hull
there are puffer/blow fish of different varieties which eat the oysters and barnies of fth ehull--makes a pop sound like a bang noise.
there are red snapper, or pargo , which also eat the gowth off boat hulls...that also makes a pop or bang sound.
the sound most like a bang is the toro bagging dinner between your hull and his mouth, as his head hits the hull...is why they have such hard heads...toro is a jack fish that looks a lot like a yellow tail tuna, but with differently shaped head.
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Old 09-06-2013, 14:36   #18
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Re: Tapping, Knocking Sound from bottom of Hull

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Originally Posted by bazzer View Post
John, I too have a similar noise to yours, I would describe mine as a crackling sound, a bit like rice crispies. I checked everything, from the electrics, to water running from a leaky tank, and yes I even thought it might be the keel about to fall off. My smart son, just home on the boat from college, googled for a short time and came up with the answer, Snapping or Pistol Shrimp. Here in San Diego they are widespread as they are worldwide. They "shoot" a air bubble from one oversized claw to stun prey. The US Navy says they are responsible for a large amount of the background noise in the worlds oceans. So maybe this is what you are hearing.
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