The Planted Tank Forum banner
1 - 10 of 10 Posts

·
Registered
Joined
·
251 Posts
I happen to agree with most of the majority on this subject until someone actually sees the snail grab a healthy shrimp or it is recorded it I will find it hard to believe. Assassins by nature are actually scavenagers that have taken to hunting a prey that they can catch and is in ready supply. This probably happened due to enviromental crunches many 1000 of years back when for some reason either competition from a better scavenger or need to find a new food source one grabbed hold of a snail and found it to be a tasty treat.

All reports even yours no one has seen the snail actually grab a live healthy shrimp and capture it. So keep observing and keep recording anything that happens and one day we will lay this question to bed.
 

·
Registered
Joined
·
251 Posts
Some snails, like the cone shell, have a harpoon like feeding device that it uses to spear the fish. The cone shell also has EXTREMELY potent poison so it kills the fish almost instantly before it can get away. If the assassin snails don't have a similar device I don't see how it would be able to actually catch and kill a shrimp before it would get away. I know they have a feeding arm but does anyone know if it can puncture anything? I have also not heard of any accounts of people saying that they are able to extend that feeding arm quickly enough to catch a shrimp.
They can not puncture anything they basically liquify with stomach acid or something similar but it is not a poision. If they caught a shrimp they would insert their tube thru a chink in the armor so to speak and work on it that way.

Planaria are even poisonous to touch for shrimp and if you notice they do jump away at the slightest touch of a planaria.
Wow love to see where you got that one because I have seen my shrimp touch, walkover, nibble at and down right ingore them.

So guys open your eyes and stop being silly, carnivorous animals will eat prey animals end of story.
Asking for proof and a confirmed report is not anything new nor to be unexpected. To say just because something is a predator it eats things so that is the way it is so deal with it is a little bit out there. I personally have never seen a Black Widow kill and eat a dog but according to your theory it does and we should just accept it?
 

·
Registered
Joined
·
251 Posts
Interesting thread !

I think Assassins snails will eat everything (live or dead), if they can catch in the tank.

So, I believe Assassins snails do eat shirmps !
I have close to 60 assassins in a tank with 100+ shrimp and have had for awhile now so if assassins ate shrimp I think I would have seen it by now, so you see why I'm finding it real hard to believe not impossible just hard to believe.

I had a large assassin snail die in the tank and the other assassins would not touch the body so to say they eat anything dead or alive that they can catch is not true either. Assassins are specailized scavenagers of meaty leftovers that have just happened to find out that they can catch snails. I have seen shrimp steal, climb on, ride on, and pick at the assassins and they just ingore them. I think if shrimp were a food source they would be a little bit more cautious or the assassins more aggressive.

But like a lot of stuff in this hobby both true and untrue proof is needed. Through out the years there have been a lot of untruths that still live today based on someone saying it is so and someone else running with it. I think today we question things more because we have learned so much in the last few years about our hobby that once we thought were gospel are really just someones point of view.
 

·
Registered
Joined
·
251 Posts
Thanks I'm trying to get the most accurate information I can in one place.
 

·
Registered
Joined
·
251 Posts
Oh.... I see !
What if not feed them couple weeks? See what happen ?
Done that they have been more than a month without live snails and have still not attacked anything else.....

They go back to scavenaging when there is not enough snails or live ones large enough for them to eat. Assassins will only take on certain sizes of snails compared to what size the assassin is. So when you dump say 5 adults in a tank and they take every snail out medium size and up they stop feeding on live snails and start feeding on detritus and other things like left over food. They will continue to do so until some of the smaller snails get to dinner size. So if they were gonna feed on shrimp they would do so during the time when there is no snails large enough or any in the tank at all.

Because of how the assassins work I have a 29 gallon that the Assassins go thru a period of a month or more waiting for the snails in the tank to reach feeding size. I have not seen a single one eat a Shrimp/Fish/Other Assassin during that time unless dead. As a matter of fact during most of the time when there are no snails of desired size they are half buried in the gravel and hardly move. I have one that started to grow alage.....:eek5:

It isn't that I'm not saying it can happen but reliable and proof backed information is lacking. Also with the number of people that are keeping assassins in with their shrimp you would think that you would hear more account of them eating shrimp.

I make daily observations of my tanks at least 3 times a day and sometime for an hour or more I just sit and watch what is happening.... Like I found out that not only do Damsel Fly Larvae eat shrimp but they also eat Palanaria go figure, but unless I can capture in in an image I would not expect anyone to take my word for it.

Yes I know I need a Life but that is the advantage of being retired....:)

No one is saying that it didn't or couldn't happen, but to make a blanket statement that they eat shrimp based on an observation that did not include the actual capture brings forth a lot of questions and cast a shadow of doubt on the whole thing. Lord knows I have been guilty of jumping to a conclusion before.

Once I have enough to start another tank I plan on putting only assassins and shrimp in the tank no snails. I also plan to let the shrimp survive on nothing but Bio-film so that there will be no introduced food. If they are gonna eat the shrimp they will do so at that time. This is all part of an experiment to answer more questions like this one that are floating around out there.

It is threads and questions like this that keep me going. Most of the info on Asassins is more factual like where they live etc. That type of info is easy to gather but daily observations to hammer out what they really do or don't do is sorely lacking.
 

·
Registered
Joined
·
251 Posts
No problem these guys have kind of become and obsession for me.
 

·
Registered
Joined
·
251 Posts
Okay there are 3 of us that are going to try and see if we can create the conditions and get an assasssin to take down a healthy shrimp.

  • One of us has 30 shrimp with 75 assassins
  • One is going to add quite a few assassins to his shrimp tank
  • and I'm gonna do what I said above for about a month to 2 months time to test out the theory
.
 

·
Registered
Joined
·
251 Posts
There should be no problems none of us that I know of have been able to get an assassin to eat a healthy shrimp.
 

·
Registered
Joined
·
251 Posts
Cool its only cos I saw it on another forum too.

Will they eat marble sized apple snails? (if they do I can easily moved the apples before I put the assassins in).

Thanks
The snails will be a target so move them.

Still have not gotten an Assassin to eat a healthy shrimp even when starved for 2 weeks now. None of us have said it can't happen we have stated that it is very unlikely until the actual capture is caught and recorded or the hunting and killing can be dupilicated there is just a lot of doubt. There are a lot of animal behaviors that we know exist today that started out by someone claiming they saw it and no one really believing it until one was documented enough times or filmed.

It takes people making a claim and someone making a concentrated effort to prove or disprove it to move science forward. That is what we are trying to do here at least some of us are, because we would like to prove or disprove your claim for the good of the hobby. As for myself I find it hard to believe from experience, but I have not said it is impossible.

On the same note there are those that will always believe there was another shooter on the grassy knoll, Santa is really watching you, or that Nessie is really there no matter how much evidence exist that such is not the case and that is their right to do so. Assassins are rather new in the hobby and there is probably still some we don't know, but as more people keep them and they become more common this gap between fact and belief shrinks until all we have left are facts. Some of what we claim as fact will probably change and some of the things we say are beliefs right now will probably become fact over time as we gain more knowledge.

So please keep the obsevations rolling in no matter how mundane of far fetched they seem. We can not experiment to prove or disprove unless we know what we are testing for.

@Ebichua - I for one thank you for bringing this up this has been an interesting disscussion and a great source of inspiration to keep studying these cool little snails. On a note I did have a large female Cherry go down and with in 10 minutes 3 assassins were on her and sucked her clean just as you described. Was kind of cool to watch, sucked out her insides like a kid with a choclate shake.:)
 

·
Registered
Joined
·
251 Posts
I have larger to medium nerites running around as happy as clams in 2 tanks with Assassins, no loses as of yet. Arakkis has lost olive nerites to them though.
 
1 - 10 of 10 Posts
Top