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Old 11-05-2009, 08:54 AM   #1
Vox
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We think we have a mantis...

Hi all,

We think we have a mantis shrimp. We hear clicking. Lots of clicking. And something ate my spotted manderin fish .

So far, that's all we've lost in terms of fish and inverts. We do have lots and lots of little snails, so hard to determine if we've lost any of those.

I've spent many an hour standing in the middle of the night in the dark, peering into the tank with a torch with red cellophane over it, trying to locate the rock that he lives in. I've seen loads of little crabs, and many a time thought I caught him but it was my peppermint shrimp or a crab. So far, though, it has evaded me.

I find that the mantis will click a lot when we walk near the tank, which I've heard is common with mantis shrimps.

Soo... I'm looking for some clues on how to locate him?

Other tank inhabitants are naso tang, yellow tang, powder blue tang, 5 blue/green chromis, 1 B/W clown, 1 flame angel, 1 cleaner shrimp and 1 peppermint shrimp.

Any clues or ideas? We'd just like to move him to the sump away from the fish.

Many thanks,

Vox
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Old 11-05-2009, 12:31 PM   #2
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I would try and get some meaty food to drop in the tank at night when your looking. Some of those little shrimp would be perfect. Might draw him out of his hiding place.

Once you find him you may want to be careful about putting it in your sump. There are two different kinds from what i understand. One with a pincher like a crab and the other with a blunt kind of club that it hits and stuns its pray. The smasher club kind have been known to hit the glass and can crack it if they are unhappy.
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Old 11-05-2009, 02:00 PM   #3
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It would have to be a fairly good sized manits to take out a fish. How big is the tank? I have the occassional pop from my tank, but it's my pistol shrimp. No idea why he does it.
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Old 11-05-2009, 02:05 PM   #4
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pistol shrimp: The snapping shrimp competes with much larger animals, like the Sperm Whale and Beluga Whale, for the title of 'loudest animal in the sea'. The shrimp snaps a specialized claw shut to create a cavitation bubble that generates acoustic pressures of up to 80 kPa at a distance of 4 cm from the claw. The pressure is strong enough to kill small fish and shatter glass.[7] It corresponds to a zero to peak pressure level of 218 decibels relative to one micropascal (dB re 1 μPa), equivalent to a zero to peak source level of 190 dB re 1 μPa at the standard reference distance of 1 m. Au and Banks measured peak to peak source levels between 185 and 190 dB re 1 μPa at 1 m, depending on the size of the claw.[8] Similar values are reported by Ferguson and Cleary.[9] The duration of the click is less than 1 millisecond. The snap can also produce sonoluminescence from the collapsing cavitation bubble. As it collapses, the cavitation bubble reaches temperatures of over 5,000 K (4,726.85 degrees Celsius).[10] In comparison, the surface temperature of the sun is estimated to be around 5,778 K. The light is of lower intensity than the light produced by typical sonoluminescence and is not visible to the naked eye. It is most likely a by-product of the shock wave with no biological significance. However, it was the first known instance of an animal producing light by this effect. It has subsequently been discovered that another group of crustaceans, the mantis shrimp, contains species whose club-like forelimbs can strike so quickly and with such force as to induce sonoluminescent cavitation bubbles upon impact.[11]
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Old 11-05-2009, 02:17 PM   #5
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Dang Captain.. great info right there. A think it's a little too detailed for most people, and maybe a little more than what people really care to know, but still great information none the less. Only.. is that description about.. "pistol shrimp"? or mantis shrimp? That sounds like something you would expect from a mantis, since pistol shrimp are generally nice shrimp.. no? Please correct me if i'm wrong. I would like to know.
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Old 11-05-2009, 03:52 PM   #6
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It could probably shatter thin glass. Same thing with a mantis. Both can have a serious kick, but not to crack 3/4 inch glass.
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Old 11-05-2009, 04:19 PM   #7
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Good article on trapping a Mantis.
How to Trap a Mantis Shrimp?
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Old 11-05-2009, 04:25 PM   #8
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you could always do a heavy dose of copper

That's a joke. Don't do it!!!
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Old 11-05-2009, 07:33 PM   #9
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Wow so many replies. Thanks all!

I wondered if it were a pistol shrimp. I've heard that pistol's click 1 or 2 times, but mantis's click multiple? Is that true? We just get click, click, click, click ... sometimes 10 in a row, then sometimes just the occasional click. And the loudness varies, but it can get loud. In fact the clicking has woken me up at night, and my tank is down the hallway in the loungeroom!

I know pistols are good friends with coral gobies. We had a couple of coral gobies in there, but they got eaten some time(few months) back. At the time, we figured crabs did it, cause they were so tiny.

What are other signs that will help me figure out if its a mantis or pistol? Do pistols live in the sand or in LR? I'm _fairly_ sure, based on the directionality of the clicking, that the critter is in the top layers of my LR. But its a little hard to tell with the way sound moves with the water.

We have 145 gallon (550 litre) tank with 1/2 inch glass, including sump.

Thanks again!
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Old 11-05-2009, 07:40 PM   #10
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Pistol shrimp will make a burrow under some of your rocks. They always stay down in the sand bed. I have heard that pistols will just click once or twice as well. I really doubt that they would click that many times in a row. From what you have said there is probably little doubt that it is a mantis in there somewhere.
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