Brackish Riparium with Mangroves

hydrophyte

New member
Am I allowed to post a topic about brackish tanks here? I do not currently have any saltwater setups, but I am interested to explore the idea of growing brackish plants. Of the species that I have been looking at the only one that can apparently tolerate full-strength seawater long-term is red mangrove (Rhizophora mangle), but the number of suitable plants expands a lot at lower salinities.

Most of the information that I run into on the Internet regarding brackish planted tanks describes certain aquarium plants that seem to be able to withstand brackish water, such as Java fern, Anubias, Valisneria and certain others. However, I see scant references to these sorts of plants actually growing in estuaries or mangrove swamps out in nature, so it might be possible that many of them are not such good representations of that sort of habitat. In contrast, there are several riparium plants that could be grown above water in a brackish riparium to make a more authentic representation of a mangrove swamp or estuary. I already have several such plants established in riparium planters...

  • black mangrove (Avicennia germinans)
  • white mangrove (Laguncularia racemosa)
  • leather fern (Acrostichum danaeifolium)

I had all three of these going in my 50-gallon tank, but I have since moved them around. Here is a quick shot showing the black mangrove and the leather fern pretty well in the 50.

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These specimens that I have are all currently growing in freshwater, and I imagine that for best results I would need to slowly adapt them to brackish water. Several of the plants in that setup, including the Caladium (with white-spotted leaves) are strictly freshwater and would not survive in brackish water.

Here is a quick picture showing the foliage of one my black mangroves. These plants grow slowly. This specimen is more than two years old but only about 24" tall.

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Like most kinds of mangrove plants, black mangrove has leathery leaves.

Here is a list of additional brackish species that I can get ahold of to try in riparium planters...

  • red mangrove (Rhizophora mangle)
  • buttonwood (Conocarpus erectus)
  • ciliata crypt (Cryptocoryne ciliata)

There is a common aquarium plant, Bacopa monnieri, for which I have run into several references as growing in brackish water. I don't know how accurate this is, but once I did see some in Florida growing pretty close to the beach. I have some of that one and I will plan to try it too.

I have my already-established mangrove plants scattered around in various tanks. I just need to shuffle around a few things to make room in the 40 breeder where I plan to set this thing up.

There is also some fun research to do on fish selection. I don't have any fish yet for this project.
 
Here is a fun observation for my little black mangrove trees that I have, still growing in fresh water.

Black mangrove trees do not develop stilt roots the way that red mangroves (Rhizophora mangle) do, but they do grow these pneumatophores.

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Pneumatophores probably help the mangrove trees to improve oxygen uptake in strongly anoxic substrates. Cypress knees might have a similar function.

It takes a while for the pneumatophores to develop. I only began to see them a few months ago on my plants, but I have been growing them in riparium planters for a couple of years. You can see that the tree has a pretty substantial little trunk about 5/16" thick. At first I thought that they were just wayward roots, but they kept growing and it was clear that they were the pneumatophores.
 
Last night I moved some more things around to make room in the 40 breeder. I can start getting the mangroves into there soon. I am not going to add salt right away because I want to spend some time conditioning some livebearers in the first, but I can work on growing up the mangroves some more anyway in the meantime.
 
This is interesting please keep posting your pics, I am considering planting some red mangroves in a 40 gal , on the floor in front of a window that is full length to the floor.

What are you using for substrate for yours? Mine would get a line from a tank overflow above them and then a return line to the sump. So it has to be enough off the floor to gravity flow to the sump, still , as they grow slowly it should be doable. I dont know how much bio filtering that they will do but they are an attractive addition to the system. I think that 6-8 would do well in the 40.
 
Hi! I hope to post some more pictures soon.

I have the mangrove plants all together in one 40 breeder, but it is still all freshwater and I haven't started adding salt yet. I am holding some freshwater plants in the same tank too.

I am still working on fish stocking ideas. I got a few new good suggestions.
 
Finally after a couple of weeks I cleared some space and got the tank set up. This is a 30 breeder.

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I have these really great manzanita stumps that I am going to use in here. I started them soaking to leach some of the organics out and get them to sink. I need to go get some aragaonite sand for the bottom of the tank.

This is going to be a nice simple setup with a few pretty cool fish and plants.
 
Hey thanks for the responses Monkeyfish and macma101.

I do not have any fish yet, but I am narrowing down my selections. I think that I definitely want to include some orange chromide cichlids and I will probably also use some kind of brackish-adaptable livebearer.

I am just using a single T5 strip for now.

I am writing a series of blog articles with more detail about this setup for the AquaBotanic.com blog. Follow this link to read the first entry...

Mangrove Riparium Journal - Article #1 of 4

avicennia-germinans-propagules-b-ab.jpg
 
Here is another really great mangrove that I plan to use in the tank, white mangrove (Laguncularia racemosa). I currently have it going in my 11-4G riparium setup but it is growing fast and getting too big for that tank. It has these great paddle-shaped rubbery leaves.

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I have been growing it all along in freshwater. It will need an adaptation period to grow in brackish conditions.
 
Oh I haven't been back here in a while. I do have some updates for this tank. I did not maintain it like I should have over the wintertime--my basement shop was awfully chilly--and the plants declined. I lost a few plants, but I have added more and I have it going again. I should try to post some photo updates.
 
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