Pomacea canaliculata: Proven Predatory Instincts

Now I am really confused. Per this thread..http://www.applesnail.net/forum3/viewtopic.php?f=12&t=15006..

- all vegie diet for young or breeding canas, or those in warm water will result in predatory tendencies.

This is exactly what I was doing. The temperature is 74-76 degrees as what it should be. Anything higher will trigger them to turn over their smaller siblings for food although the cannibalism incident (which I just recalled) happened during my vacation due to shortage of food supply after my refusal to entrust anyone to feed them due to high risk of overfeeding. The babies were never fed with meat which as I repeated earlier, they begin to cannibalize once they get a taste for the meat. I do believe the incident involving the disappearance of their smaller siblings may have somehow triggered them to prey again and this time turning their teeth on my fish. On the other hand, the hatchlings may have simply died from starvation and the older siblings didn't pass the opportunity to eat them out of their shells but in my loaches' case, they never had a history for any illnesses and any symptoms would have been detected immediately considering I monitor all my tanks daily. The above possibilities based on cannibalistic tendencies are theories but still likely.

I think I should check the crude protein of the shrimp pellets I am using as it was simply in a bag repackaged and meant as a treat for the snails. Will have to switch to other brands with high protein. Oftentimes, the crude protein of shrimp pellets is 38% just like any other brands I find. Feeding them a high protein diet is not the same as feeding them meaty foods which could adversely change their behavior. Maybe a brand with 42% crude protein will do the trick and at the very least, minimize or reverse their cannibalistic tendencies although they never had issues with their operculums nor their shells which would require protein and calcium respectively. I think it falls down to hunger triggered by insufficient protein diet. The shrimp pellets seem very insufficient somehow.

There is another case where the owner had to feed her canas meat to avert the cannibalistic tendencies towards her diffusas. Fortunately, I don't do this mix as I had always known my snails might pick off the poor diffusas especially as the latter barely can make a run for the food compared to the canas.

I don't know I just find somehow the canas are best kept by themselves which I do with the exception of the loaches that they eventually eliminated. If there has to be a fish, it would have to be one that can swat the snail off with ease if it attempts to latch on the skin to gnaw on it alive.
 
Last edited:
as I recall, flaringshutter keeps canas with her goldies, right? I wonder if she has ever seen any predatory tendencies in canas. Could be that the goldfish are robust enough to avoid it, but maybe it's what she feeds them as well.

*Paging Flaringshutter. Flaringshutter, please report to the Invert Lobby, thank you*
 
This makes me question the fact I put 2 huge apple snails in my 29g community tank. Both apples have disapeared behind my wall where my khuli, plecos and some cory cats hide. This also makes me wonder if brigs can also do this. I keep brigs and rams in my shrimp tank. Though, the apple snails have been housed in a 1g tank with a betta, cory, and oto.


Just to be safe, im setting up a 5g when I get home and put all of my snails in there. Little *******s ain't eating my fish!
 
I'd rather be safe than sorry. I have 2 huge apples I took out of my sister tank because they had gotten so large.

I'd call it being paranoid...;)

As far as I know Pomacea diffusa (bridgesii) are for the most part vegetarians. I highly doubt they would go after a healthy, living fish.

EDIT: forgot canas are "apple snails" as well...so if those are the ones you have it may be an entirely different story.
 
Diffusas are fine. I have them with my guppies, nerites, MTS and plecos. They have never been observed to go after anyone. The apple snails of canaliculata complex however have been observed a few times to go after fish after having a taste for meat (which in my case I did not). The only theory I can think of is they may have been responsible for the disappearance of their smaller siblings during my absence for a week and repeated their cannibalistic tendencies towards the fish.
 
AquariaCentral.com