- Harlequin Shrimp -
just found out its nor a sexy shrimp it's a harlequin shrimp. <That explains a lot.> What do I feed them besides Seastars? <Ummm, nothing... they pretty much only eat Seastars - I used to feed mine chocolate chip stars, probably the cheapest you can find rather than the really pretty ones like Linckias and Fromias. Cheers, J -- >

- Feeding Harlequin Shrimp -
to feed the harlequin shrimp should I cut a Seastar into pieces when it's alive or should I kill the Seastar first, if so how do I kill it, or should I just put a Seastar in the tank? <Just put the Seastar, whole and alive in the tank. The shrimp will know how to handle it.> how often should I feed the harlequin shrimp? <Depends on the size of the last meal and how quickly it was consumed. I would wait a couple of weeks between Seastars.>
Sean
<Cheers, J -- >

NMA RI Book and feeding Hymenocera
To Anthony Calfo or Bob Fenner 
<Howdy> 
I having been reading your book for the past two months. You both did a great job and I wanted to thank you personally. There is something I wanted to ask you about it.  I was reading about the shrimps. Most of all the harlequin shrimp. I have wanted them for a long time but don't like that they ate Linckia or CC sea stars. 
<Hymenocera spp. can be trained to eat other foodstuffs... mainly other live echinoderms> 
In your book you said they can eat those small stars that people get as hitchhikers. Can they really do that? 
<Yes... akin to Antoine and I and hamburgers... we prefer the half pound (pre-cooked weight) artery-busters, but will inhale a dozen or two White Castles in their absence> 
If they can would you explain to me how to get enough of them to feed the harlequin shrimp? 
<Ahh, there's the rub... either grow them (hard to do) or have access to many hobbyists close by who can/will supply them. In actual practice folks with Gnathophylliid shrimps generally buy less expensive "chocolate chip stars"> 
Do you know people who have done this or is it real rare? If it is rare for the harlequins to eat those stars do you think it is worth the risk to try? 
<Mmm, worth the risk, but would be prepared for the long haul investment to provide other fare> 
Where do you find them and do you have to do anything to get the stars to breed? 
<Asterina species just "show up" on S. Pacific LR sources... might be able to be cultured with a razor blade (ouch!)> 
I am sorry for all of the questions. I would really like to have the shrimp. 
Thank you for the great book again. Josh 
<Thank you for your kind, encouraging words and message. Bob Fenner>

- Harlequin Shrimp Food -
Hi Crew
I was reading on a message board about harlequin shrimp and they eat star fish. How big of a star fish do they eat and how often? <I used to feed mine a small [2"] chocolate chip star which would last about two weeks - I'd wait a week and then add another chocolate chip.> Also do they eat all kinds of star fish or just some kinds. <As far as I'm aware - all the Asteroidea.> There are star fish that are real small and you can order for Detritivore Kits can they eat those? <They can, but as you might guess, they don't add up to much. Have seen these small Seastars dissolve when touched by a harlequin shrimp. Would need a population of 1,000's to be a useful food source.>
Thank you crew, Karl
<Cheers, J -- >

Re: Harlequin shrimp
Thank you Mr. Fenner. I think I'm going to get them. Do you or Mr. Calfo know how to cut those hitchhiker stars or where to get them?
<Cutting them is pretty easy... a single edged razor blade... through the approximate middle... Procuring initial specimens is a bit harder... ask your LFS re... maybe they have some or if they know others who do... or if you have a local marine club...>
I will have other stars ready too in case they don't like the small ones. Can you ask Mr. Calfo if he knows how to do it too?
<Will do, but he's out of town for a few days>
James
PS I am sorry it took me a long time to write back. Hot mail is having a bad lag time.
<I see... and if you look at the FAQs, someone has written in to help you... though we didn't retain your email address, they did post theirs. Please see here: http://wetwebmedia.com/clnshrpfaqs.htm
in a day or so. Bob Fenner>

- Harlequin Shrimp Live Food Alternatives? -
Good morning
I am a French aquarist with some success (A ocellaris (1977 !) then, later on, Hippocampus kuda and Lysmata rathbunae).
I am gathering info about Hymenocera and read your articles and FAQs about it. Very interesting! <Yes, fascinating animals.>
But concerning feeding, either on WWM or elsewhere, it is always said to put LIVING Seastars in the tank.
That means that a regular supply have to be put in place. Not easy when seashore is several hundred miles away! <Yes, this is the downside to keeping these animals and the leading reason we often suggest that folks not keep them unless they can provide this food consistently. Generally speaking, a higher cost animal to keep.>
A much more easy method would be to have the Seastars frozen and to give regularly SMALL pieces of them to the Hymenocera shrimps. <"Would" be, but I've seen no evidence of this to date... as far as I know these shrimp will eat only live food.>
With of course the necessity to draw out what has not been consumed, in order not to foul the tank.
1) Would it be a convenient method of feeding (as it is for other meals given to fishes)? <It would if the shrimp would take the offering, but I don't believe that it will.>
2) If not, for what reason? <Hard to say specifically - very little hard research on these shrimp available to the aquarist. Anecdotally I can tell you that these shrimp have a very strong chemo-sense - a live sea-star dropped into the tank will cause the appearance of the shrimp, even if out of sight and separated by several hundred gallons of water. A frozen sea-star probably would not elicit this response. Additionally, there just isn't much to a sea-star and the chances are good that the freezing process would be quite destructive to the parts the shrimp needs to derive its nutrition.>
Best regards     Roger
PS1 : Apologize for my "approximate" language <No worries.>
PS2 : I am not sure that questions have to be sent to this address.
<They did. Cheers, J -- >

Harlequin Shrimp   8/19/06
Hi Crew,
<Hello Michael>
Hope all is well with everyone!
<Good with me, do not know about the rest of the crew.>
I have a quick and painless question that I just can not find the answer for.  
How long is the life span of Harlequin Shrimp in captivity assuming it has a suitable habitat?
I have had a pair for about 1.5 years and curious how long my friends can be expected to stay with me.
Thank you in advance for your help.
<My first question is...what are you feeding these guys?  These shrimp feed exclusively on Seastars in nature.  Some people have had good luck feeding them sea stars of the Asterina spp.  These type starfish reproduce rapidly in the home aquarium and should maintain a good food supply. I'm guessing that this is their diet.  These shrimp can exist with feedings of sea stars as long as three to four weeks apart.  As far as life span, years, again, depending on the environment and food supply.  They have been raised in a captive aquaculture project at the Waikiki aquarium.  I'm thinking Charles Delbeek (spelling?) had something to do with this.  Bob may be familiar with this project.  James (Salty Dog)>
Michael J. Bukosky

Re: Harlequin Shrimp   8/19/06
Thanks for the response James.
<You're welcome>
I have been feeding mine strictly chocolate chip starfish.  They seem not to be to interested in any other type.
<OK>
The female lays her eggs on her tail but I have never seen fry.  Will they release unfertile eggs?
<Could>
If not are you aware of how to raise the fry.
<I'm not, but I'm guessing the fry would possibly feed off starfish in the planktonic stage.  Bob may inject something here.  
<<Mmm, no, yes and no. RMF>.
You may want to do a search on this or go to your public or large library and ask for some help in this regard.  Bob may also know who conducted the aquaculture experiment on this species at the Waikiki Aquarium, and may put you in contact with him.>
I have breed many freshwater fish but these guys I cannot figure out.
<Would not be an easy task.>
Thank you for all the knowledge that Wet Web has given us hobbyists.  You guys and your web site are a valuable resource.
<You're very welcome.>
Now its time to finish the acclimation on my new 8 inch Stigmatochromis pleurospilus.  Lets hope he isn't to aggressive for his tank mates!
<Good luck, James (Salty Dog)>

Fab tips for feeding Hymenocera Harlequin Shrimp 8/9/05
8.9.05
Mornin' Anthony
<cheers, my friend>
Many thanks indeed for such a speedy and affirmative response to my query.
<Always welcome mate>
I was looking just now on your page re. Hymenocera and thought I'd relate this to you. I used to keep these 20
years ago and what I did (contrary to what was then current thinking) was to collect small specimens of
our native starfish, Asterias rubens and wash and freeze them. Easy for me as I live by and work on the
sea. To feed the shrimps I just snipped off enough for that feed. As soon as I dropped it in this true pair
strode round the tank, following the scent trail, then pulled out and at the hydraulics, leaving behind just
the spiny skin! By the way, I've looked at loads of forums of late and in truth WWM is the dogs wotsits!!
Kind regards Steve.
<Fabulous tips for feeding Hymenocera! Thanks kindly for sharing this... we will duly post them on the dailies page and archies for the benefit of all.
Anthony>

Propagating Asterinas for Harlequins?   8/21/06
Currently, I have two saltwater tanks. One is a 6.6 gallon nano reef in which I have a small (1.5-2 inch each) mated pair of Harlequin Shrimp along with soft
corals and a few other reef critters (Neon Goby, 1.5 inch Emerald Crab, 1 inch Porcelain Crab.
<Don't think I'd want the Emerald Crab in the same neighborhood as the Porcelain Crab, may become a meal.>
My other tank is a 20L dedicated to my 4.5 inch peacock mantis shrimp. The only other resident of that tank at the moment is a 4 inch reddish Chocolate Chip Star.
Currently I have been feeding my Harlequins Chocolate Chips.
<Mmm, no Lorna Dunes?>
(well, I fed them once so far. I've had them 2-3 weeks. Been told to feed them about every 2 weeks.)
<Could go up to four weeks if necessary.>
In fact, the star in my Mantis tank was to be a feeder, but I decided he was too big and I didn't want him getting out of hand and munching on my
corals. I am still determining how appropriate of a permanent tank-mate he is for my mantis shrimp. All build up aside, he is my question:
I found can buy Asterinas on eBay. I assume some one is cashing in on a pest-ridden tank, just like you see "tulip anemones" for sale there. How feasible would it
be to grow a herd or Asterinas in my mantis tank to feed daily or so to my Harlequins? Most people want to lose all their Asterina, I can't find any info on how to grow them.
<They multiply like weeds.  No special care needed.  Read FAQ's here for more info.  http://www.wetwebmedia.com/asterinafaqs.htm>
That tank gets pretty high in Nitrates from chunks of meaty food being discarded, hidden, then decomposing. Is that a problem or is a dirty tank the way to grow these guys?
<Would do a little more maintenance than you are doing.  Asterinas are rather small and are not going to consume large hunks of food in one sitting until you have hundreds of them.>
Can you think of any other reason why or why not to try this?
<Absolutely not, they will reproduce faster than the Harlequins can eat them.  Keep in mind, they don't always go after Asterinas. Try it out, see what happens.>
If I do, can you imagine any way to keep a bunch of these guys without them reaching "plague" proportions?
<Discard them if they get to plague proportions.>
I like to see inside my tank. I am in a position to set up a separate (simple) system to grow these guys. If you can clue to me in to ideal parameters for these guys, I may try that.
<Nothing critical here, drop in some decent flake food and you are on your way.  Just keep normal parameters up such as salinity, pH, etc.>
Thanks,
<You're welcome.  James (Salty Dog)>
Andrew

Harlequin Shrimp Update 8/3/07
Hi there,
<Hello Syd>
I was reading your information page on harlequin shrimp http://www.wetwebmedia.com/clnshrpfaqs.htm
I am raising and selling these shrimp ( you refer to me when I did this at Waikiki Aquarium, but I now have my own farm).
Your answers to people seemed good to me. I can assure you that the shrimp eat pieces of frozen starfish, and seem to do fine on dried starfish. I use only crown-of-thorns stars, for political and cost reasons. Because they are large, it is not good to stick the whole star in the shrimp tank. It is ok to do that with small stars.
Anyway, if you want to use any of the info on my website, feel free to do so.
<Interesting, and thank you for sharing. Will post for others to see. James (Salty Dog)>
Syd Kraul
www.sihawaii.com/sydkraul/harly.html

Harlequin Shrimp Diet  6/9/07
I have a recently acquired pair of Harlequin Shrimp and I was wondering if they could survive on a diet of pincushion sea urchins.
<Have seen this done, yes... If your pair of Hymenocera will accept these>
These are easily collected in my area and would be cheaper than buying starfish almost weekly. Also, how much of the urchin do they consume.
<A good deal over time... likely a whole animal's complement in a week or so>
I'm worried that if they just eat the feet and leave the rest of the body,
<This is correct>
it will foul up the water too quickly.
<... depends on your system, maint...>
I don't mind buying the starfish but it would be nice if I could just pick an urchin off the seawall every few weeks. Thanks for your time.
<Only experiment, experience can/will tell. Bob Fenner>

Hymenocera Dining on Ophiuroids and Diadema?   12/27/06
Hello Crew,
<Lev>
I have an inquiry about Harlequin Shrimps. Do these guys feed on Ophiuroids? Serpent Stars
<I have seen this in captivity>
and the like seem to be too agile for these little shrimps, but I don't know. Another inquiry, Are they brave enough to tackle a Diadema Urchin?
<I would think so, yes>
Your article states that they eat urchins, but do they eat any species they get their claws on, or do they pay attention to their tough armor?
<Eat their tube feet... piercing them...>
Thanks Very Much in Advance,
Lev.
<If hungry, these Gnathophylliids will consume most any echinoderm they can find, though in most cases will choose Asteroids as their food item of choice. Bob Fenner>

Solo Harlequin -05/11/08
Hi Crew
I purchased a solo Harlequin shrimp and put it on my 10 g tank 3 days ago, I threw in a choc chip star and right away it grabs the star and start munching on it... since then the shrimp never let go, for 3 days now its just sitting on top of it (day and night).
<This is very typical/normal behavior.>
Will it ever let go of it at least once in a while or after it consume the whole thing?
How many days before I remove the star from the tank cause I'm worried that it might foul the water since it's very small system?
<The "cruel" thing about these shrimp is that, even while feeding, they have an interest in keeping the star alive as long as possible (I believe they might even feed the star). So it might be quite some time before the starfish actually dies. To know when to remove it, monitor your nutrient levels frequently and regularly. When your nutrients spike (or when the shrimp lets go of the poor creature) that's the time to take the star out.>
The shrimp is the only inhabitant in the tank (at least for now ?) and it is a SOLO!
I've read somewhere in this site that this type of shrimp will not live long unless they are in pair?
<Nah, they're fine by themselves. But do be VERY diligent with top-offs, maintaining salinity at 35ppm. They don't like salinity swings.>
pls pls pls advise as this tiny creature fascinates me and my family . If ever, can I purchase another one? and take my chances if they will pair...not even sure how you can tell the male and female? how can you tell? Also, will they fight ? I mean, if it so happen that they're both male or female?
<I would not risk adding another to a nano tank. They don't need to be in pairs and if the resident shrimp doesn't like the new addition (or vice versa), they can be quite mean (kill each other even).>
How many of this species can you keep in this size of tank?
<I wouldn't keep more than two. But again, since you already have one, I wouldn't add another.>
Can I also add at least 1 goby? maybe a yellow watchman?
<Probably, but please read about them first.>
how 'bout a clown fish?
<I wouldn't.>
or some corals too?
<Some small soft corals and/or a hardy LPS coral could work. Please see our pages on nano tanks.>
I think I'm asking too much for such a small tank! pls enlighten me before I start killing these livestock and my wallet...not to mention my wife.
<Nano tanks are tricky, please start here:
http://www.wetwebmedia.com/small.htm>
10 g , 2" sand, 2 -10g whisper filter(1st w/ carbon, 2nd w/Chemi pure), 20 lbs LR, heater, 1 Sm Rio (for added circulation) and 15w 50/50 coral life fluorescent.
Thanks in advance.... Nemo 1
<De nada,
Sara M.>

Harlequin Shrimp, fdg.  6/1/08
Hey crew, I am truly intrigued by the species *Hymenocera elegans, *and its their eating habits that fascinate me even more. From the FAQs on your page, and various other sources, it seems they are very specific to consuming live echinoderms such as starfish and urchins.
<Yes, usually confined so>
My question is that do you know of any successful attempts of feeding the shrimp an alternative source of food.
<Yes... have read accounts>
While this may sound ridiculous, I was wondering if they have the ability to distinguish from a living and a replica starfish?
<Interesting speculation>
To me, it seems that in the wild, in it natures way of eliminating excess reproduction of starfish.
But to replicate the same in captivity by having to by a starfish for the sole purpose of feeding seems unethical.
<One can extend such thoughts to include keeping ornamental aquatics period, or over-populating, polluting the planet with our species to the largest extreme>
On the side note, are there pests or perhaps faster reproducing starfish which can be easier to attain, while the shrimp gets its benefits as well?
Thanks
<I don't "know" well-enough re alternative feeding success to relate others claims directly. All the Gnathophylliid shrimps I've seen kept long-term have been fed live echinoderms. Bob Fenner>