Some snails in the brackish Baltic Sea

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Some snails in the brackish Baltic Sea

Postby Blötdjur on Mon Jan 21, 2008 2:54 pm

I hope to start a little brackish tank with the biotope of shallow water outside Stockholm. There will be both soft and hard substrate and macro algae. This will only contain small snails, since this is what you find here (but lots of them!), except perhaps some freshwater species. The salinity will be around 6 PPT.

Snail species will be the nerite Theodoxus fluviatilis (link), one or more in the family Hydrobiidae (link), and hopefully more snails.

I have started this in a bucket :-)

Here is a map of the Baltic Sea:
Image
The numbers in white show the number of marine species visible with just the eye. As the salinity lowers there are also more and more freshwater species.

Here is a map of the drainage area for the Baltic Sea:
Image
Sverige is Sweden and the red dot there is Stockholm.
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Postby Blötdjur on Tue Jan 22, 2008 12:30 pm

Hydrobid, young isopod, and young Theodoxus fluviatilis:
ImageImageImage

Some hydrobids can live in masses, and I have seen pretty dense populations of T. fluviatilis too. It would be cool to have really dense populations one or more species :-)

T. fluviatilis gets smaller in brackish water than in freshwater.
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Postby Pollux on Tue Jan 22, 2008 5:15 pm

so are you planning to have just snails?
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Postby Blötdjur on Tue Jan 22, 2008 8:20 pm

I want to basically take a piece of the biotope and study it. Snails is a big part of it, which I think is very interesting!

There is also a pretty big isopod which I might consider, Idotea baltica (link). There is also a relatively huge isopod (not considering the giants on the bottoms of some other seas :-)) which seemingly got trapped here and in some freshwater lakes in Sweden when it had come down from the north when there was an opening between the seas. This is Saduria entomon (link), which interests me but should probably have a bigger tank. It can be up to 8.6 cm., which is nearly 3.4 inches, and is a predator. Isopods are nice I think.

From the sample I took, other animals will be amphipods, copepods, hydras and bryozoa. There are also barnacles and I will see what turns up. Mussels can be hard to keep since they might need algae to filter out.

Also, I am interested in algae, which as I said I will include.
Last edited by Blötdjur on Tue Jan 22, 2008 8:54 pm, edited 1 time in total.
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Postby Blötdjur on Tue Jan 22, 2008 8:27 pm

This one I don't think exists in the Baltic Sea :-):
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http://en.wikipedia.org/wiki/Giant_isopod
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Postby Blötdjur on Tue Jan 22, 2008 10:51 pm

Saduria entomon, one cool isopod (picture from here: http://www2.ecology.su.se/dbbm/var/zb_umsc.htm):
Image
There are problems with these attacking fish caught in nets.
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Postby Blötdjur on Wed Jan 23, 2008 12:57 pm

There is also a nice shrimp, Palaemon adspersus (link), but I don't know how big tank it should have.
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Postby Blötdjur on Wed Jan 23, 2008 1:47 pm

Isopods are super cute :-) They are nearly shrimp, you arent afraid of shrimp are you? :-)

I encourage you to keep land isopods or water isopods, just remember, many, if not all, land isopods need moisture.

Land shrimp nearly, super cute :-)
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Postby Blötdjur on Wed Jan 23, 2008 7:02 pm

If you are reading this badflash, I saw your post on another forum, and yes I have kept Asellus aquaticus (a freshwater isopod), and they seemed to do well. I haven't seen them in a while, but they could be hiding in a pile of rocks I have in a tank with fish. I also have Gammarus pulex (a scud I guess you say, an amphipod).
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Postby Blötdjur on Sun Jan 27, 2008 5:48 pm

This tank takes perhaps only a little more than a gallon (2.5 - 3 liters perhaps) :-)
Image

Here are some hydra polyps, Cordylophora caspia:
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Postby Blötdjur on Sun Jan 27, 2008 9:21 pm

I like seeing the tiny nerites sweeping around on the seaweed.

It's a tiny tank for tiny snails :-)
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Postby Pollux on Mon Jan 28, 2008 2:38 am

cool :D
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Postby Blötdjur on Mon Jan 28, 2008 5:04 pm

Yes I know :-)

Next I will collect some silt and sand for the bottom, with animals. And I'll see what else I can find. Those isopods I was thinking about (Idotea baltica) can have different colours (even red) and patterns, very nice. If I have some in my tank already they must be small, I have lots of small isopods.
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Postby darktoad on Tue Jan 29, 2008 5:06 am

I look forward to seeing more photos of your various isopods and other critters.
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Postby Blötdjur on Wed Jan 30, 2008 1:28 am

That's nice!

First earlier, then recently:
ImageImage

I would like to do some snail time-lapse movies...

The Theodoxus fluviatilis nerites have some other appearances than I have seen in freshwater, among other things they have magenta, pink and purple colours :-)

The Baltic Sea is apparently the sea of over-nutrition, algae, isopods, small snails and fish.
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