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-   -   Different speed in development of teen apple snails (http://www.tropicalfishkeeping.com/invertebrates/different-speed-development-teen-apple-snails-6246/)

Mirta 06-01-2007 10:29 AM

Different speed in development of teen apple snails
 
Hi!

I have been reading here about apple snails and understood that they need a lot of calcium for their shells. Could lack of calcium be the reason for slower development of some of my snails?

Since I have set up a new 80 gal tank I've moved some of my apple snails of the same family there from their old 40 gal home. In a couple of weeks I observed that the snails that remained in the old tank are much smaller than those which were moved. We have hard tap water, so I think that the water in the new tank should contain more calcium.

Also, the mother snail has sadly died recently for no apparent reason in the old smaller tank. She went dormant and slightly active from time to time. I kept on checking her condition until I realized she was gone. Her shell had changed colour a bit before it happened - it became pale. She was probably old - she was quite big when we got her.

But what is happening with her kids? Those which were moved had to undergo some relocation from time to time since I had to treat my new tank for disease with liquid medication and do complete water change twice. However they are still doing fine and look much bigger, more active, and happier than their siblings in the old tank. The temp is slightly higher though in the new tank so that also might affect their active behaviour and growth rate.

Sorry for such a long post - just wanted to give all the info I have.

Falina 06-01-2007 03:46 PM

The snails will grow much quicker in warmer tempteratures, though will not live as long. I think this may be why your snails in the new tank are grpwing much quicker.

Sorry to hear of your loss.

Trishfish 06-01-2007 06:40 PM

Apple snails secrete a hormone in the water that slows the growth of some on purpose. It's natures way of ensuring survival. If all the bigger snails get eaten up by birds, for example, the smaller ones which are harder to see are still there to keep the species growing. I always have snails from the same clutch that range from pea sized to nickle sized.

Lack of calcium won't slow growth but will cause shell erosion over time so you really need to up your level.

Mirta 06-02-2007 02:54 AM

Wow how clever! :shock: I really appreciate your help! I did know about the temperature but the difference is not so big to cause such a drastic change.

The calcium might harm the fish, isn't it so?

I have read that sepia which we used for birds can be used. Should it be crushed or can I put it there whole?

Lupin 06-02-2007 06:14 AM

Quote:

Originally Posted by Mirta
The calcium might harm the fish, isn't it so?

No. It is already present in almost every tank although there are cases where it is often insufficient.

The use of cuttlefish bone for snails will prevent shell erosion.


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