Look what I found in my tank!

Most species of mantis cannot harm a tank. However, there are a several species that can. They have the best eyesight of any animal in the world and the second fastest movement of any animal in the world. In fact, they have an acceleration equivalent to a 22 caliber bullet being fired. Smasher mantis kill snails and crabs by smacking them very hard with that force to break open their shells. If it is one of the larger types of mantis and they hit your glass, they can break it.

Again, most hitchhiking mantis are of no danger whatsoever. Even if they have the acceleration down pat, they are still subject to Newtonian physics. I.e. Force = Mass X Acceleration. The smaller ones can handle the acceleration but they don't have the mass to be dangerous.

BTW....my signature are peacock mantis eyes. If you look an the line in the middle, that is because each eye is able to see in binocular vision. Many species can also see in ultraviolet, infrared, and polarized light.

 

Chris,

If you keep it, this might be helpful.

You've all seen the posts before. "All 3 of my fish died...what could've caused it?" The answer comes back, "You must have a mantis". That is actually highly unlikely. Smashers can take out small fish but rarely do. I've even kept fish successfully in my mantis tanks. On the other hand, if your missing a small snail and you find a broken shell, you probably have a mantis.

First of all, while they definately do have the fastest movement in the animal world, most of the species that are common hitchhikers cannot break your aquarium or hand. It's simple Newtonian physics. Force = Mass x Acceleration. The smaller mantis have the acceleration thing down pat. However, they don't have the mass in their clubs. The picture that Geoff linked to is a peacock mantis. It is one of my favorite species. When full grown, they can break small tanks and they can hurt you so keep your hands out of the tank. Unfortunately they are never hitchhikers. Since I see some interest in keeping mantis, I'm copying and pasting some information I wrote up for someone on another site.

I apologize in advance that this post is concentrated on smashers. However, I've never kept spearers so my knowledge is limited to what I've read for them.

I have to tell you. I've done softy tanks, SPS tanks, mixed reefs (not a good idea ), etc., etc., and so on. In the course of doing this, I have observed a lot of interesting critters. However, none have ever been more interesting than my mantis. Not only that, mantis have been the only animals that observe me back. I'm not talking about getting excited about being fed like cats, dogs, and fish...I'm talking about a quite intelligent creature studying me right back.

I have kept many species of mantis. Most hitchhiking species do not require an acrylic tank. However, if you want to keep my favorite species (Peacock Mantis) it will be a VERY good idea once it hits about 5 inches or so. If you have a small nano with very thin glass (like an eclipse) and you desire a medium size mantis as opposed to a small one, it is a very good idea to put a thin piece of plexiglass on the bottom of the tank before putting down a sanbed. Once they get into den building mode and they start banging, they could care less if it is rock they are banging or glass. There are species that are even larger than peacocks but I've never once seen them available to anyone other than scientists.

There is one thing that ALL smasher species of mantis requires even if it is a small hitchhiker...a titanium heater or a cage around a glass heater (unless your heater is in a sump). I can't tell you how many smasher-mantis have met an untimely death due to electrocution by hitting the ultra-thin glass used in most heaters.

It's real easy for me to advise you on a spearer tank. A VERY deep sandbed. That's about it. Unfortunately, you won't see a spearer very often in captivity and you won't get one as a hitchhiker because they don't live in LR.

For smashers, a good setup truly depends on the species you have and/or want as I alluded to above. I have had good results by creating a den for mantis using PVC tubing (size depending on species) and covering it with LR. You want the tubing to be 1 and 1/2 larger than full grown size of the mantis so they can turn around (and you will be quite surprised on how quickly they can turn around). Do NOT put the other open end of the tubing against one of the glass walls. They get into redecorating mode often (just like my wife) and if there is any type of barrier against extending their den, they may or may not decide to keep banging on it until they get through. Remember, they get stronger as they get bigger. Your specimen may not take to your den at first because you will have placed it in such a way as to maximize view. However, I've found that once you become known as the "bringer of food" and they are more comfortable, they will accept this new den. Regardless, I've found that they will make a secondary den too. Provide shells and small pieces of rubble for them to decorate, and re-decorate, and re-decorate, ad-infinitum.

Why hyper-salinity dips don't work to remove most mantis.

Many mantis live on patch-reefs and intertidal zones. When the tide goes out for half of the day, the water pools, evaporation happens, the temperature in the tidepool increases substantially, and the salinity continues to go through the roof until the tide comes back. They are accustomed to this type of abuse.

Where did my mantis go? He's been doing well for months and he/she put a whole bunch of rubble in front of the den and I haven't seen it for days.

It's molting. They have an exoskeleton and eventually their tissue size will outsize it. They have to shed it in a similar manner to shrimp. Leave the molt in for a day or two. They will often eat it for calcium, strontium, and other needs. Then discard it. BTW...the molt on the first day will be an EXACT duplicate of your mantis. Unfortunately, just like in nature, this is the most likely time to lose a mantis.

Should I add Iodine to help my mantis shrimp molt?

Heck no. Mantis shrimp are not shrimp, they are stomatopods. However, this is one area where they are similar. Just like shrimp they have an exoskeleton and adding Iodine MAKES them molt, it doesn't HELP them. If you force them to molt too early, you are severely weakening it.

How do I make my mantis like me?

All living things have an innate instinct for security, food, and procreation. Provide them with a secure den, and from the beginning don't allow any natural foods for a while. You need to provide it. Once they feel secure, you will then become the "bringer of food". It's not a good idea to put more than one mantis in a nano because sexing them is hard to do unless you are holding onto them. In nature, mantis of the same species and sex merely engage in "I'm tougher than you" contests like rams and they both walk away at the end. However, in a small nano tank, there isn't sufficient retreating area. In other words, don't try to breed them unless you are SURE of their sexes. Most species breed with the same partner for life.

I understand that in nature, some critter is always eating another critter to survive. However, I cannot put something in my tank that might be killed.

If so, then a mantis probably isn't a good animal for a species-tank for you. If you have a smasher, once you earn their trust, you will have to start adding a clean-up crew. If mantis don't exercise their clubs, they will lose them in the next molt. With feeding of your mantis, most of your clean-up crew will be left alone. (They are quite intelligent and prefer free food over food that requires work). However, they will slowly one by one disappear over time.

Should I put my hand in the tank?

I'm quite popular in St. Louis when someone has a mantis. That's because I will grab SMALL mantis out of a local reefers tank with my bare hand. They will back up from it like I pulled out a lion or a grizzly bear. Being afraid of a 1 inch G. wennerae as opposed to an 8 in peacock is like being terrified of kittens because lions have killed humans before.

I've heard clicking and have a couple broken snail shells so I'm sure I have one. I tried the red lense over the flashlight trick at night but could not see my mantis.

In addition to being able to see polarized lighting, many species can also see in ultraviolet and/or infrared light. The red lens trick is not going to work on most species.

 

Very cool, but if it's eating it's mates that's not good.

I'm another voting for you to spend big $ to start a nano just to save it.

 

Here is a link with a video clip (right below the first picture of the shrimp) that will answer your question ;D

http://www.berkeley.edu/news/media/releases/2004/04/21_shrimp.shtml

Amazing creatures , truly! Best suited for acrylic tanks IMHO!

 

This is really interesting, especially Inwall's discussion! A web site at UC Berkley has a lot of the science (ugly things, aren't they?) but is there anything else that someone can add about these creatures?

 

http://ozreef.org/content/view/7/2/
http://www.reefkeeping.com/issues/2004-03/jf/feature/index.php
http://socrates.berkeley.edu/~korff/images/Patek_etal_04.pdf
http://blueboard.com/mantis

 

Great stuff Curt! I posted my link and did not see the page 2 of the thread! LOL!

Saw...

What other info are you looking for? It was a comprehensive article, I thought.... could you be more specific with the request?

 

Birdlady,
I wasn't looking for anything in particular, perhaps some anectdotes (sp?)from people who have had mantis shrimp -- behavior they noted, what they liked about them.

 

Yes, that would be interesting...
I know Amcarrig and JohnO both had one at one time or another.....perhaps they would like to share?;D

 

I'll let them tell you why they liked theirs. I don't even know how many I've had over the years. I kept mantis when no one wanted them. I've owned 3 O.s. mantis (peacocks) but I've also kept the more common chiragra, smithii, wennerae, etc. Often times, I've simply babysat for hitchhikers that I yanked out of someones tank until I found someone else that wanted it.

While peacocks are my favorite, the smaller species are quite interesting too. My peacocks were kept in acrylic tanks for obvious reasons. One of those tanks was right on my desk. Fluffy (don't ask...the name started as a joke) would sit down in the front corner of the tank and watch me work. It was fascinated with both me and the "magic screen" which was my computer monitor. Fluffy hated my wife and never got over the "vacuuming incident" when it had only been in my tank for a couple of weeks. She also didn't like my yellow lab but liked my chocolate lab. It was my yellow labs fault though. She would bark, stick her nose against the tank, and wait for the SMACK then bark, stick her nose against the tank.........well you get the picture. For my wife, all she did was go into a meral spread whenever she was within about 2 feet of the tank. I told my wife that all she had to do was feed her and after a week or two it would no longer dislike her but she wasn't interested. Like I stated before, it's the only animal I've ever kept that actively studied me right back.

I think it's fun to watch them decorate their dens, calculate how to sneak up on prey, and observe their surroundings. I think it's fascinating how quickly they can swim and change directions. Even though they are long, they can do a 360 degree turn at a moments notice.

Obviously, you have to learn how to deal with certain limitations if you are keeping one of the larger species. You have to get (or make) a long-handled algae scraper and a feeding stick is very useful too. For the smaller species, it's a good idea as well.

Here's one interesting tidbit.....most people will tell you that mantis are either smashers or spearers. That's true with the exception of my favorite species.....Peacock mantis are both smashers and spearers. Obviously, for that reason, I've never kept fish in their tanks. Another interesting tidbit, if you do clean the nano tank with your hands you have to watch both ends of the mantis. They can snap you with the front end or they can stab you with their uropod spine on the back end.