lucas
Achatina achatina
Posts: 45
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Post by lucas on May 15, 2020 5:07:16 GMT
I have done a lot of research on nerite snails but there is a lot of conflicting information and information that is only one a single website with no citation. There are a few things I haven't been able to find or conform. I'm hoping someone here knows.
Is it true that Neritina coromandeliana changes its shell pattern dependent upon water conditions and is much more lethargic in freshwater than in salt water.
Is it true that Neritina semiconica is the same species as the Neritina turrita? They have very different patterns but snails can have different patterns within the species.
Can similar species (in the same genus) create hybrids?
Has anyone ever bred them in captivity?
Are Nerites always darker in the wild and get lighter in captivity?
How long does the larvae stage last?
Do zebra or tiger Nerites ever occur in freshwater naturally?
Does Neritina natalensis occur in mountain streams?
If I have any others I will add them.
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Post by wolf on May 15, 2020 16:42:52 GMT
Hi lucas,
I'll try to help as far as I can....... .
I kept Vitta usnea (same family: Neritidae) for some time and they changed their pigmentation pattern when the water conditions changed. That seems to be normal in Neritidae. Just a question of epigenetics.
As far as I know, Neritina turrita and Neritina semiconica are the same species (it's just a younger synonym). See: WILSTERMANN-HILDEBRAND, M. (2010): Rennschnecken bestimmen, Teil 1 -- Amazonas 31, 68-72, Natur und Tier – Verlag, Münster, Germany.
Again: as far as I know, Neritina spec., Clithon spec. and other freshwater species of this family have never been bred successfully in captivity. They lay eggs which don't develop. We don't know what conditions they need (besides brackish water, of course). So it is difficult to tell whether hybrids are possible. We don't even get "normal" offspring. So the specimens you can buy were collected in Asia and many snails die in transit. That's a big problem, in my personal opinion. Sorry, but what are the scientific names of zebra and tiger Nerite?
Have a nice time, take care: wolf
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Post by littlegoldsnail on May 15, 2020 17:12:40 GMT
I have done a lot of research on nerite snails but there is a lot of conflicting information and information that is only one a single website with no citation. There are a few things I haven't been able to find or conform. I'm hoping someone here knows. Is it true that Neritina coromandeliana changes its shell pattern dependent upon water conditions and is much more lethargic in freshwater than in salt water. Is it true that Neritina semiconica is the same species as the Neritina turrita? They have very different patterns but snails can have different patterns within the species. Can similar species (in the same genus) create hybrids? Has anyone ever bred them in captivity? Are Nerites always darker in the wild and get lighter in captivity? How long does the larvae stage last? Do zebra or tiger Nerites ever occur in freshwater naturally? Does Neritina natalensis occur in mountain streams? If I have any others I will add them. I don’t know if they change their shell patterns based on water conditions, but I have never seen it. No, they are not more lethargic in freshwater, mine are super energetic and I know tons of other people who keep them solely in freshwater and they do great. Don’t know. Don’t know I have heard before that it is possible for them to breed in captivity, but difficult and extremely rare. They only breed in brackish. Don’t know Nerite snails do move up stream sometimes and will live in freshwater naturally. They usually live at river mouths or in bays from what I’ve heard and at certain life stages and times of year will go up river, but they only breed in brackish areas. This is what I have heard from my research. |
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lucas
Achatina achatina
Posts: 45
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Post by lucas on May 15, 2020 18:11:06 GMT
Thank you! The scientific names of zebra and tiger Nerites are Neritina natalensis (other species are also sold as zebra nerite though) and Neritina semiconica. Do you know what encourages them to lay eggs? I want to try breeding them but they won't lay eggs. I have 2 zebra Nerites and 2 tiger Nerites.
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Post by littlegoldsnail on May 15, 2020 18:53:42 GMT
Lot so of food, good water quality, and warm water usually encourages them to breed. Do you have a brackish tank?
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lucas
Achatina achatina
Posts: 45
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Post by lucas on May 15, 2020 19:46:41 GMT
Thank you! I don't have a brackish tank yet but I will set one up if they lay eggs.
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Post by littlegoldsnail on May 16, 2020 2:09:17 GMT
Their eggs are going to be pretty much impossible to remove, especially if you are trying not to damage them. It might be better to transfer them to brackish before hand.
Also, you can’t just “set up” a brackish tank just like that. Just like any other tank, it needs to cycle and mature before it can sustain life properly. You would need to seed the tank with some live, saltwater nitrifying bacteria and feed the tank with ammonia till the colony establishes itself, which could take a couple weeks. I would recommend setting it up, cycling it, then if they start mating, move them over.
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lucas
Achatina achatina
Posts: 45
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Post by lucas on Jun 4, 2020 19:10:34 GMT
To move the eggs I would just move the ornament they are on. I know that tanks need to be cycled but I do not want to do that until I know there will be eggs. Some Nerite snail individuals will never lay eggs.
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lucas
Achatina achatina
Posts: 45
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Post by lucas on Jun 4, 2020 22:48:30 GMT
I have another question. What are the yellow things by a Nerite snail eyes? They normally hide them but in these pictures they can be seen. ibb.co/2jMv8Kjibb.co/3kvYfn2 |
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