Can Zoanthids hurt a human?

chkltcow

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This evening when I got home from work, I checked my SW tank like I always do. One of my snails had gotten flipped upside-down, so I was gonna reach in and flip him back over so he could get on the glass and continue doing his thing. As I was picking him up, I noticed my hand bump into something "squishy". It took a second to register, but I realized I was touching the Zoanthid polyps on that one rock. I yanked my hand away quickly, and noticed a few of them closing up. Once my hand was out of the water, it kinda felt like a burning sensation, but I'm not sure if they actually caused something or if it was just the psychosomatic response from me touching something I know can be toxic. I don't have have any open wounds on that hand, and I rinsed my hand off in tapwater just to be on the safe side.... but I'd like to know if there's any chance they could actually hurt me or if I'm just overreacting.
 
Without being alarmist, Yes they can kill. :-(
Zooanthids carry a toxin called palytoxin which is one of the most powerful nuromuscular toxin known to man. There is no known antidote if this gets in your system.

Saying that, its very hard to get it into your system and unless you have broken skin or open wounds etc then you shouldnt get poisoned.

I have included some posts from people that are from other forums on this very subject.

saw this on an american forum board and thought i'd bring it to your attention...especially as a couple of you are having probs with these little bu**ers First I'd like to say that I'm ok. And second, I hope that some of you might avoid a simliar experience. I have a small nano reef tank that I've recently set up at work. Its an 18g softy tank that I planned to showcase zooanthids in. So a few weeks ago, I purchased about 10 colonies from the logical reef, and set up the little nano for them. About two weeks ago, I noticed a small nudibranch on/in some of the zooanthids. I actually posted here about it to get an ID. I didnt want anything eating my new zooanthid colonies, and I wanted to make sure I didnt need to remove it from the tank. The ID came back as tentatively a zooanthid eater, so I just made the decision to remove them. I'd been picking them out of the tank for about the past week without any thought or worry. Today however, was a different story. I saw one of the little nudi's on the front glass, and I thought that instead of pulling it out, I'd just squish it against the glass. So I reached in and with my index finger, I pressed it into the glass. The thing was about the size of a small zooanthid polyp, or about the size of a pencil ereaser. I saw a little bit of the goo inside it squeeze out, and then I brushed it off my finger in the water with my thumb, pulled my hand out and wiped it off with my towel. It only took about 5 seconds for me to realize something was wrong. I got a hot flash. I didn't think anything of it right at that second, but I sat down and turned back to my computer. About 20 seconds after that, I got another flash, and I noticed that my heart rate was starting to rise. I immediately knew something was seriously wrong. I waited another 30 seconds before I turned around and told a coworker of mine to dial 911. He gave me a questioning look, and I said that I really meant it, and so he said alright, turned around and dialed. At this point, I started to get dizzy, and my heart was really starting to ramp up. This is maybe 90 seconds after I squished the little nudi. He hung up the phone and said they were on their way, and I started to explain what happened in case I lost consciousness before the EMT's got to me. He knows a bit about my hobby, so he understood what was going on. I propped my feet up and tried to breath slow, but it was getting harder to breathe, and my heart was still going faster. The EMT's got there in about 4 minutes. I work in DC and I'm only about 2 blocks from the whitehouse, and 5 from George Washington Hospital, so it thankfully didnt take long. They came up and lifted me out of my chair, put me in an orange chair, strapped me in and got me on oxygen. They carried me out of my work, with everyone looking on of course, into the evelvator and down into the ambulance. The EMT asked me to describe what was happening, so I told her I was having trouble breathing, my heart was racing and I was dizzy. She took my blood pressure. At this point it was about 150/80 and my heart rate was 115bpm. She laid me back, turned up the oxygen, and we headed off for the ER. It only took another 3-4 minutes to get back to the hospital. There was some traffic, so they asked me if I could walk to a wheel chair. I said I'd try, but as soon as I stood up, I collapsed. So they put me back on the stretcher, and took and extra 30 seconds to back the ambulance in to the dock. They then wheeled me into the centrel of the critical care unit. At this point, they hooked me up to another blood pressure machine. At this point it was about 10 minutes since exposure, and my blood pressure was 169/70 and my heart rate was 154bpm. They wheeled me into a big room, and hooked me up to oxygen again. Three doctors arrived and started to question me. At this point, my fingers on both hands had begun to tingle, simliar to when your hand falls asleep and you start to get blood back in it, only about twice as many pins and needles. I told them this, and I described how the tingling was moving from my fingers up my arms. The sensation made it to my elbow before it started to receed. This is about 15-20 minutes in now, and my thighs began to have a low burning sensation from the inside. This moved down my leg on the inside and back up the outside. Around 25 minutes, my legs went numb. My fingers were also numb at this point, though not to the extent that my legs were. Around the 30 minute mark, I started to shake. Not a violent movie style shake, but a low tremble in my thighs and hands. I could not control it. They actually had to have me sign something at this point, and what ended up on the paper was not really recognizable as a signature. This intensified slightly for about 10 minutes, though never to the point where I was bouncing around on the bed. Just a shake that I couldnt stop. A little more than a shiver when you are really really cold. Around 40 minutes, this started to subside. They took my tempurature, and it was normal. I had another couple of hot/cold flashes, and my hands began to feel cold and clammy. They checked my breathing and heart with a stethoscope, and asked if I had any pain anywhere. I didnt. They also took my shirt up and checked me over for rashes. I didn't have any. For the next 15 minutes the hot flashes continued, but I felt like my heart was slowing down. I kept taking my own pulse to make sure my heart was still beating. At 150bpm, you can't really tell that your heart is beating, its just tripping along inside your chest, and I wanted to make sure it didn't stop or start to flutter on me. I dont know what I would have done about it, but it made me feel better. Around an hour, there was a noticable decrease in the number of flashes, and my heart was coming back down to where I could count the individual beats. They stopped constant watch over me, and my coworker and boss showed up. I was starting to feel better at this point, and I was chatting with them for maybe 20 minutes. It seemed like the worst was over, so my boss went back to work, and my buddy stayed with me. He sat with me for about an hour until another doctor came in. He checked all my reflexes, asked me a couple of questions and then left. I got up to go to the bathroom, and was able to walk down the hall without too much trouble, though I was still dizzy and felt very weak. I layed in the critical care room for another two hours as my strength slowly came back, and things went back to normal. Around the 4 hour mark, my blood pressure was back down to 132/76 which is normal for me, and my heart rate was 86bpm. At this point, I actually felt pretty good, and asked to be discharged. They agreed and let me go. Diagnosis: Toxin Exposure of an unknown nature. I'm supposed to take it easy this evening and if anything funny starts to happen, call 911 again. To be honest, I feel ok now, a little out of it, but I think its more from stress than any risidual toxin. One important thing to note, was that even though I described the zooanthids, and the palytoxin they are known to produce, the doctors were unable to dig up any resource with any information concerning treatment or antidotes. They even called the national aquarium in baltimore for information and came up dry. As I was leaving, I actually logged on to reef central and showed them the palytoxin threads. They were amazed. They filed away the information for later use. I'ts about 9:20 now, I've been out of the ER for about 3 hours. This whole thing started around 1:30pm today. I guess what I want to get across is, that, despite the inherent beauty of our hobby, there are dangerous things that live in our tanks. I wont stop keeping tanks because of this, and if anything, I've just been given a deeper respect for what comes out of our oceans. But please, be aware, and be careful. After 6 years of uneventful reef keeping, I've come to love this hobby, and I thought I knew what was going on and had it all under control, but I was put in my place today. It just goes to show you that we still all have so much to learn, and we have to be careful about learning it. Thank you. marine keepers like it salty


the above Zoanthid polyps release a chemical called palytoxin in their mucus and gonads - nice. This palytoxin is reported to be a neuromuscular agent that can cause paralysis and death in humans The book says that "It is important to wear hand protection when touching these animals - especially if the handler has any breaks in his or her skin." Any thoughts, deaths. Come to think of it, Will has been pretty quiet recently. Sleep well, Jerry. marine keepers like it salty

From what I can recall the palytoxin has no antitoxin and as has been mentioned is a very dangerous neurotoxin so it is really important to make sure that 'silly' little mistakes like this are not made, thanks for posting nige, maybe it will save someone or somethings life.

Didn't know they were dangerous, wasn't told. I have handled them frequently, even scrubbed them with a nail brush the other day to get rid of hair algae.[:0][:0][:0] I wish someone would say something about them when you buy them. Should they even be on sale

I have several collections of these in my tank and have handled tem too. I have never felt any ill effects with them but I do urge anyone to treat these (and all marine life ) with the uttmost respect.

Better stil. purchase some long sleeve gloes for working in an aquarium, they are very usefuland also stops those nasty stings you get from bristleworms when you put your fingers udner a rock to move it :-( :*)
 
WOW! Well I know there are lots of things in the ocean, and for that matter in our hobby, that carry some strong toxins. The other day at Ripley's Aquarium, the diver doing the tour was talking about puffers and boxfish, and the toxins they produce. And most of these toxins don't have an anti-toxin, just like they said palytoxin doesn't.

Well, I think I might invest in a pair of those gloves soon. This was just one of those freak things where I was doing something else and felt my hand brush against it.... just touched my finger at the base of my pinky and felt odd. No open wounds there, no marks after the fact, and the burning only lasted a few seconds. I still think it was just my brain telling my body "that wasn't good" and freaking out.

Thanks Navarre :)
 
The problem is they look totally harmless. NOt like lionfish with its large fins and huge mouths! Not like nudibranches with they vivid colours to give you a warning sign. Zooanthids are simple button polyps, some are nicely coloured but not enough to make you think there is any warning in their markings.

You can brush your hands over these for years and suffer no ill effects and this of course will breed complacency (Spelling :/ ) but one day you might just touch one with a scratch on yur hand or some similar skin problem THen what is an innocent looking poylps can be a different matter altogether :sad:
 
A guy around here was fragging some Zoos without caution and his Doggie somehow munched on one. Poor dog was dead four hours later! And the man was left with a great loss and a newfound respect for his hobby.

I read about a guy on reef central who was working on his tank moving some softies around. After having a sandwich while admiring his handiwork, he inadvertantly grabbed the towel he had been using to dry his hands to use as a napkin to wipe the ketchup off his mouth. Three days later, his sense of taste gradually returned.... :eek:


GL
 
Thank you guys for scaring the living crap out of me :p


I think I'm gonna pick up some gloves this weekend ;)
 
Remember that salt water it self is "funny" feeling. So don't go crazy with thoughts. OTOH be safe and wear protection when:

1) moving lots of stuff (easy to break skin on a snail shell or sharp rock or catch a worm wrong).
2) you already have broken skin. Not just because of toxins, but bacteria abound in a SW tank esp w live sand / rock.
3) ripping apart toxic animals... AKA fraggin'
 

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