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Old 12-07-2009, 03:05 PM   #1
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Ever since I got to FL I've been hearing a strange snap, crackle, pop sound coming from under the boat.... It started about a month ago in St. Augustine and drove me nuts for about a week... for some reason we only heard it at night but I figure that may be because of the other noises that about during the day (boats, radio, us moving about and talking, etc) ...at first I thought it sounded like an electrical short crackling... so I spent a night crawling around in the bilges in the dark watching for a sparking... then shut down and tested in sequence most of the boats electrics... no sign of a short that I could find... even with the elctrics disconnected the sound persists.... so I keep looking, listening feeling the hull.... I can find nothing to explain the sount... when we left St. Augustine and started south again the sound seemed to stop.... was it just caused by the water moving under the boat (st. augustine has a pretty good current)... but now I'm in Stuart and there is very little current and the sound is back with a vengance... louder than ever and not only at night.... it's very inconsistent and seems to move around... sometimes its on one side of the keel then the other, then forward, then aft.... a local yachtsman suggested that it may be catfish eating off the hull... maybe.. that's a new one to me.... I ran aground a few times this year, all soft (mud) landings, but it gives me some concern now with the noise... could it be a crack in the bilge letting water in, crackling as it moves under the glass.... the boat is dry, no water ingress and looks ok from what I can see through the murky water here...

any suggestions that might put my mind at ease or point to something in need of attention... i'm dumb-founded.
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Old 12-07-2009, 03:10 PM   #2
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Any mussels or barnacles starting to grow below the waterline?
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Old 12-07-2009, 03:17 PM   #3
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nothign substantial that I can tell... I keep the waterline clean and the bottom, having just recieved fresh antifoul in march this year, just seems to be slimy, no major growths as best I can see diving in this mucky water.
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Old 12-07-2009, 04:50 PM   #4
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Ever since I got to FL I've been hearing a strange snap, crackle, pop sound coming from under the boat....

any suggestions that might put my mind at ease or point to something in need of attention... i'm dumb-founded.
You can relax. Its common. Nothing to do with your hull. We have been told it's from shrimp and some other fish feeding.

Take a look at
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Old 12-07-2009, 05:02 PM   #5
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Amazing. I thought I knew quite a bit about marine creatures but this is new to me and absolutely stunning (no pun intended)

Thanks for the link!

Aye // Stephen
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Old 12-07-2009, 05:14 PM   #6
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How interesting. Thanks Evans.

Does anyone know - do these occur world wide?
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Old 12-07-2009, 05:22 PM   #7
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neeto... the clickity clack in the video is pretty close to what I'm hearing through the hull... may not be the pistol shrimpl himself but something like that... thanks for putting my mind at ease.
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Old 12-07-2009, 06:30 PM   #8
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Hey there, this is a familiar story!

When we purchased our wood boat, David slept onboard for 5 days before she was hauled out into the boatyard for our major work. He immediately heard these same noises and assumed it was nasty little wood-eating beasties nibbling away at the hull. However, within a couple days of hauling out our schooner, he purchased a little Rawson 30 to sail around here in San Diego while the work on the bigger boat was underway. The first night he slept on the Rawson (a fiberglass hull) the same crackle, pop, noises commenced. We later learned from local boaters "that's the tiny shrimp making noise--no worry, its nothing eating your hull!". We thought they were called something like "popcorn" shrimp. But pistol shrimp sounds right.

When we re-launched the schooner after 2-1/2 years in the boatyard...within hours we heard the "snap, crackle, pop" of the shrimp again We note they are most active at night and most active during a full moon--talk about weird.
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Old 12-07-2009, 06:32 PM   #9
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How interesting. Thanks Evans.

Does anyone know - do these occur world wide?
Yes, all over, from the tropics to the ice - but not in fresh water
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Old 12-07-2009, 08:48 PM   #10
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I heard them first off Catalina Island near Long Beach. I've heard them many times since. Kinda horrifying the first time.
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Old 12-07-2009, 09:50 PM   #11
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Now that is pretty amazing and really interesting, thanks for the link ...
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Old 12-07-2009, 11:01 PM   #12
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Very Common in tropical waters - also one genus that lives in Fresh water caves

SNAPPING SHRIMP
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Old 12-08-2009, 01:42 AM   #13
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Hi, When we were in Raiatea a crew off a yacht just put back in the water heard noises and they said it sounded like termites eating away at the hull and asked if we had the same noise and we did. We have experienced it in many places and I think and could be wrong, that it is also related to the water conditions and wind direction with the noise being made by the water ripplettes hitting the hull and colliding with each other. Cheers John from Oz.
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Old 12-18-2009, 04:14 AM   #14
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You can relax. Its common. Nothing to do with your hull. We have been told it's from shrimp and some other fish feeding.

Take a look at
Wow, this pistol shrimps are amazing. I read or heard about them sometime. They seem familiar somehow, also their sound. I heard something like that before and now I know what this actually could be Thank you so much. Watching your pistol shrimps I came across this one here - strange and beautiful as well. Its a bout the deep sea creatures from National Geographic



Cheers
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