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You are here: Home Volume IX August 2010 Freshwater Aquaria: Considerations for Scaping and Stocking the Paludarium, Part 2

Freshwater Aquaria: Considerations for Scaping and Stocking the Paludarium, Part 2

By Kenneth Wingerter Posted Aug 14, 2010 08:00 PM Pomacanthus Publications, Inc.
This article focuses on aquascaping, terrascaping, and stocking paludaria; a preceding article began this discussion with a focus on paludarium construction.

A paludarium is a type of vivarium that is specialized for the display of flora and fauna that live on, or very near, the bank of a body of water. Being modeled on many disparate habitat types, paludaria are capable of housing a great variety of livestock that can present conflicting husbandry requirements. Thus, the paludarist should--early in the planning stage--develop a clear picture of the physical environment he or she wishes to create.

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At the waters edge. Photo by Bill Brissette.

Defining and Characterizing Paludaria

The term "paludarium" is itself derived from the Latin root palud-, meaning "swamp." However, paludaria are hardly restricted to swamp-like biotopes, and can indeed be utilized to represent habitats as diverse as floodplains, sandy beaches, ephemeral ponds, tide pools, wetlands, lake shores, mangrove stands, peat marshes, rocky streambeds, estuaries, or any habitat where aquatic and terrestrial life might mingle.

Paludaria have an area that is flooded with water (i.e., a submergent section), but have a dry area (i.e., an emergent section) comprised of rock, sand, soil, and/or wood that typically serves as a substrate for terrestrial plant growth. All true paludaria (according to conventional standards) feature fully integrated submergent and emergent sections; systems like those termed "river tanks" and "aquaterraria" are generally not categorized as such for the reason that the two sections are more or less separated with partitions or basins. While the duality of the two fluid media (i.e., air and water) is clear enough, aquatic and terrestrial elements of the paludarium display are physically, chemically, and biologically inseparable. Distinction of the physical, chemical, and biological processes occurring therein as categorically "aquatic" or "terrestrial" is--more often than not--a mere matter of degree.

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A great variety of bromeliads will flourish in a paludarium environment. Photo by Erich Sia.

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Plantings can extend from, and into, the paludarium enclosure. Photo by Kenneth Wingerter.

From a purely practical perspective, the designation of a biological exhibit as an aquarium, terrarium, or paludarium is not always straightforward, nor necessary. That having been said, reasonable qualifications might be a water level that is significantly below an enclosure's full height (say, 25-75%), with an emergent section that displaces a significant amount (say, 25-75%) of the water surface.

A paludarium is oftentimes described as a cross between an aquarium and a terrarium; however, because all fundamentals of both aquarium and terrarium keeping must be addressed, they are more aptly described as a combination thereof. It is for this very reason that these dynamic, multifaceted displays present as many challenges as they do possibilities.

Paludarium Exhibit Design

While detailed instruction for the creation of every possible paludarium decorative scheme cannot be provided here--there are far too many for that--the process by which these systems are developed does merit some attention.

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Reflective properties of paludarium surface waters can enhance the aesthetic quality of an otherwise modest subject. Photo courtesy of http://hidekisam.bp-creation.fr.

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At the 2009 Taiwan International Aquarium Expo, the growing interest in paludaria was palpable, to say the least. Photo by Erich Sia.

The paludarist will usually begin by selecting a particular habitat type to establish, or a particular set of species to keep (and thusly a type of habit by default). The selected habitat can be modeled after some natural environment (inclusively for diverse representatives of a distinct ecological community), or provide an idealized environment (exclusively for one, or several similar, species). The clearer one's vision of the anticipated habitat type is, the more harmonious one's husbandry strategy and aesthetic objectives will be.

Most basic environmental qualities of a paludarium will conform to a model ecotype. Two such qualities, namely temperature and photoperiod, are related to latitude and can be denoted as tropical, subtropical, or temperate. Another such quality lies in its water chemistry--especially concerning salt concentration. Paludia can be modeled after freshwater, brackish, and marine environments.

An example of a tropical freshwater system--incorporating a pea gravel substrate with driftwood and granite river rock--might include a school of hatchfish, a rubber eel (Typhlonectes natans), longhorn beetles (Titanus spp.), philodendrons, and swordplants. An example of a subtropical brackish system--incorporating a sand/silt substrate with large shell fragments--might include a school of anableps, a mudskipper, water pimpernel (Samolus spp.), dwarf onion plants (Crinum spp.), and black mangroves. An example of a temperate marine system--incorporating a beach sand substrate with slabs of basalt--might include sculpins, gunnels, ochre sea stars, purple shore crabs (Hemigrapsus nudus), sea grass (Phylospadix spp.), and cordgrass (Spartina spp.).

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In some cases, aquatic insects, such as these water striders, can be captured and introduced to the paludarium to provide food and entertainment. Photo by Kenneth Wingerter.

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A mudskipper struggles with its prey at the waterline. Photo courtesy of Cetacean2007@gmail.com.

While the paludarium layout will surely be influenced by the choice of habitat type, certain other factors will ultimately be of considerable consequence. To make the most informed selection of equipment (re heating/cooling, filtration, air circulation, etc.), the volume of each aquatic and terrestrial section should be calculated in early planning. The actual, rather than relative, size of each section of the paludarium will, of course, have a greatest impact on the health of the inhabitants; that is, a pair of killifish will probably fare better in a 20"x10"x12" (10-gallon) paludarium with a 7-gallon aquatic section than in a 24"x12"x16" (20-gallon) paludarium with a 5-gallon aquatic section.

An estimation of water depth/water surface coverage will help determine which materials are to be best used in the scape, and which species are to be suitable inhabitants. It should be noted that water depth and water surface coverage are not necessarily in direct relation to one another. For example, a flooded rainforest simulation that is specially laid out for arboreal frogs--a jangled canopy of down wood and epiphytes over a shallow, mossy, lentic pool--might have a very low water level but a very high water surface coverage; a creek riffle simulation that is specially laid out for a group of darters--a steep, rocky backdrop with emergent vegetation over a deep, gravel-bottomed, lotic pool--might have a very high water level but a very low water surface coverage.

Aquascaping / Terrascaping the Paludarium

Designing a paludarium can be a highly rewarding artistic endeavor. The inherently dual nature of these systems can lend a dramatic ambiance to even the most basic decorative scheme. The countless tiny ripples of falling rain drops, the trickle of water from a small fall, or a bloom gently bobbing at a foggy water surface are among a myriad of powerful aesthetic statements that can be conveyed at the air/water interface.

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With an inspired arrangement of décor and water features, even a small paludarium can produce a grand impression. Photo by Bill Brissette.

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Unlikely neighbors, such as this Tillandsia sp., Anubias sp., and Rhizophora sp., might successfully cohabitate in a paludarium. Photo by Kenneth Wingerter.

Paludarium scapes will typically be formed from the bottom up--that is, over a carefully selected substrate. Aquarium substrates are generally preferred to terrarium substrates for this in that they are fairly inert and cannot foul or cloud the water. The composition/grade of the substrate should be selected primarily on the basis of the needs of livestock, rather than its appearance. Ideal substrate depth will likewise depend on livestock needs. The substrate should not, however, be used to build up the terrestrial section; tall, steeply sloping banks of gravel or sand not only make a paludarium incredibly heavy, but also tend to flatten out over time and need frequent reshaping. Alternatively, a base for the terrestrial section can be formed (perhaps in multiple levels) from lightweight stone (e.g., lava rock), nylon bags filled with LEC (lightweight expanding clay) balls, or even blocks of Styrofoam. So-called false bottom bases can be made from screen and/or egg crate atop PVC feet. However it is constructed, the base of the terrestrial section should be reasonably stable and allow for adequate drainage.

Terrestrial substrates should not be easily washed out or waterlogged. Soils, if used at all, should be fully contained by a nontoxic, non-biodegradable liner (e.g., fine nylon netting or burlap cloth) and placed just above the water table. Terrestrial plants will usually grow well in a wad of rock wool under a moist (but not wet) blanket of peat moss, leaf litter, or other appropriate ground cover. "Plant walls" can be constructed out of hardware cloth or plastic screen and fitted to plastic frames, filled with soil and/or shredded coconut shell, and fastened to the back and/or sides of the enclosure. Coarse osmunda fiber can be glued or siliconed directly to the enclosure walls to provide a substrate for climbing plants. In some cases, mushrooms, lichens, and bryophytes can be encouraged to grow on wood or in ground cover.

Stocking Paludaria

Paludaria are capable of housing a diversity of flora and fauna that can rival that of a well-stocked reef aquarium. Numerous aquarium and terrarium species can be kept in paludaria; some species can only be kept in paludaria. Nevertheless, compatibility issues will restrict the number of species that can be housed in any given system. As evident from a glance at tables 1-3, conflicting environmental needs will quickly shorten a list of candidate specimens; potential for aggressive or predatory interaction might further shorten such a list. For example, caecilians might devour certain fishes, certain insects might devour certain plants, lizards will devour most ornamental insects, and most turtles are sure to devour most everything.

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Attractive features, such as fog and falling water, can breath life into a paludarium exhibit (ceramic ornaments and colored lights are optional). Photo by Erich Sia.

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Carnivorous plants can make interesting paludarium subjects. Photo by Diana Izdebski.

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Some herps might enjoy a short-term visit (as for a bath) in a paludarium. Photo by Kenneth Wingerter.

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Floating plants help to define the horizontal plane of the paludarium water surface. Photo by Kenneth Wingerter.

Moreover, one might exempt a particular species due to the amount of time, effort, or expense required to properly care for it. Those who do not anticipate viewing their display at night might exclude nocturnal species altogether. Some species might be struck from the list simply on account of the likelihood that they will quickly outgrow the available living space.

It is highly recommendable to quarantine all animals prior to their introduction to a paludarium. This practice spares the paludarist from the potential difficulty of treating animals from within the display, and affords each new acquisition with a period of restful seclusion. Here, the number/quality of hiding places will be of greater importance than enclosure size. Oftentimes, it will be best to quarantine aquatic and terrestrial animals in separate holding systems. Each quarantine setup should be functionally equivalent to the display setup--that is, maintained at a similar temperature, pH, photoperiod, etc., but without regard for appearance. The animal(s) should be easily observed/accessed; the holding system should be easily cleaned/maintained. Hence, for this purpose, artificial plants and PVC "caves" in a bare-bottomed tank might be better than adequate.

Table 1: Suitable Paludarium Invertebrates
Suitable Paludarium Invertebrates Minimum Enclosure Size, LxDxH (inches) Preferred Temperature (°F)
Freshwater clam (Corbicual spp.) 20x11x13 65-83
Common pond snail (Limnaea stagnalis) 20x8x8 66-70
Zebra nerite snail (Neritina natalensis) 20x8x8 72-77
Olive nerite snail (Vitta usnea) 20x8x8 72-77
Malaysian burrowing snail (Melanoides tuberculata) 20x11x13 72-77
Japanese trapdoor snail (Viviparus malleattus) 20x11x13 68-83
Giant African land snail (Achatina fulica) 24x9x13 70-75
American ghost shrimp (Paleomonetes paludosa) 20x11x13 68-83
Crystal red shrimp (Caridina sp. "crystal red") 20x11x13 70-78
Bamboo shrimp (Atyopsis moluccensis) 24x13x17 68-83
Giant African fan shrimp (Atya gabonensis) 24x13x17 75-84
Rainbow crab (Cardisoma armatum) 20x11x13 75-85
Flower crab (Sesarmops intermedium) 39x16x20 68-82
Fiddler crab (Uca spp.) 30x12x13 74-84
Hermit land crab (Coenobita perlatus) 30x12x13 70-78 (68-70 night)
Red crayfish (Procambarus spp.) 37x19x20 33-83
Mexican orange dwarf crayfish (Cambarellus patzcuarensis) 20x11x13 68-83
Cobalt blue lobster (Procambarus spp.) 30x12x13 68-83
Praying mantis (Mantis and Sphodromantis spp.) 20x11x13 ~75
Walking sticks (Carausius, Dares, and Phyllium spp.) 20x8x8 varies
Peruvian fern stick insect (Oreophoetes peruana) 20x11x13 ~77
Madagascan pink-winged stick insect (Sipyloidea sipylus) 20x11x13 ~75
Javan leaf insect (Phyllium bioculatum) 20x11x13 ~75
Water strider (Gerris spp.) 20x11x13 varies
Diving beetle (Dytiscus spp.) 20x8x8 varies
South American rhinoceros beetle (Dynastes hercules) 20x8x8 ~77
Table 2: Suitable Paludarium Plants
Suitable Paludarium Plants Growth Habitat
Sweetflag (Acorus calamus) Aquatic (emergent)
Mondo grass (Ophiopogon spp.) Amphibious
Gold ribbon (Dracaena variegatus) Terrestrial
Aponogeton (Aponogeton spp.) Aquatic (submergent)
Liverwort (Marchantia polymorpha) Terrestrial, Epiphytic
Elodea (Elodea spp.) Aquatic (submergent, floating)
Anubias (Anubias spp.) Amphibious
Philodendron (Philodendron spp.) Terrestrial, Epiphytic
Tillandsia (Tillandsia spp.) Epiphytic
Water sprite (Ceratopteris difformis) Aquatic (floating)
Parrot's feather (Myriophyllum aquaticum) Aquatic (submergent, emergent)
Mud mat (Glossostigma elatinoides) Amphibious
Peace lily (Spathiphyllum spp.) Terrestrial
Mangrove (Avicennia and Rhizophora spp.) Aquatic (emergent)
Palm fern (Blechnum gibbum) Terrestrial
Bromeliad (Aechmea spp.) Epiphytic
Java fern (Microsorum pteropus) Amphibious
Java moss (Vesicularia dubyana) Amphibious, Epiphytic
Hanging cacti (Rhipsalis and Lepismium spp.) Epiphytic
Water hyacinth (Eichhornia crassipes) Aquatic (floating)
Creeping fig (Ficus pumila) Terrestrial
Banana plant (Nymphoides aquatica) Aquatic (submergent)
Dwarf Horsetail (Equisetum scirpoides) Aquatic (emergent)
Golden pothos (Epipremnum pinnatum) Terrestrial
Sword plant (Echinodorus spp.) Amphibious
Aglaonema (Aglaonema spp.) Terrestrial
Table 3: Suitable Paludarium Vertebrates
Suitable Paludarium Vertebrates Minimum Enclosure Size, LxDxH (inches) Preferred Temperature (°F)
Blue danio (Brachydanio kerri) 20x11x13 73-77
White Cloud minnow (Tanichthys albonubes) 20x11x13 64-72
Gold dojo loach (Misgurnus anguillicaudus) 24x13x21 68-76
Wild betta (Betta foerschi, B. picta, B. burdigala, and others) 20x8x8 75-86
Archerfish (Toxotes jaculatrix) 48x19x24 68-82
African butterflyfish (Pantodon buchholzi) 24x13x21 75-86
Ornate bichir (Polypterus ornatipinnis) 37x19x20 77-83
American flagfish (Jordanella floridae) 24x13x17 66-72
Dwarf frog (Hymenochirus curtipes) 20x8x8 72-82
White's tree frog (Pelodryas caerulea) 26x16x16 80-85 (68-75 night, ~68 winter)
Horned frog (Megophrys montana nasuta) 30x12x12 70-78
Suriname toad (Pipa pipa) 30x12x12 70-80
Oriental fire-bellied toad (Bombina orientalis) 20x8x8 68-77 (65-68 night, ~50 winter)
Axolotl (Ambystoma mexicanum) 30x16x16 60-72
Tiger salamander (Ambystoma tigrinum) 30x12x12 60-70
Japanese fire-bellied newt (Cynops pyrrhogaster) 24x9x17 65-72 (48-55 winter)
Red-spotted newt (Notophthalmus viridescens) 20x11x19 60-70 (40-50 winter)
House gecko (Hemidactylus frenatus) 24x9x17 ~82 (65-70 night)
Rock gecko (Nactus pelagicus) 24x13x21 72-79
Crested gecko (Rhacodactylus ciliatus) 24x13x17 ~76 (~72 night)
Knight anole (Anolis equestris) 36x12x24 83-90, 75-80 (night)
Red-bellied side-necked turtle (Emydura subglobosa) 39x16x20 ~77 (95 basking)
Matamata (Chelus fimbriatus) 39x16x20 78-86
Smooth soft-shelled turtle (Apolone muticus) 48x19x22 78-82
Garter snake (Thamnophis spp.) 30x12x13 68-80 (85-90 basking, 48-54 winter)
Rough green snake (Opheodrys aestivus) 24x13x17 77-86

Conclusion

All of the constraints pertaining to habitat and specimen selection aside, paludarists have a wealth of interesting subjects to work with. A thoughtfully designed paludarium layout and discerningly assembled collection of paludarium plants and animals can be uniquely striking.

Though paludarium keeping is steadily gaining interest, it remains somewhat of a novelty. Consequently, there is scant pertinent literature to guide ones effort to successfully construct, decorate, stock, and operate these rather complex systems. That notwithstanding, advanced aquarium and terrarium keepers alike may find this relative lack of precedence to be nothing less than a great opportunity for discovery and innovation.

Sources

  1. Alderton, David. Firefly Encyclopedia of the Vivarium: Keeping Amphibians, Reptiles, and Insects, Spiders, and Other Invertebrates in Terraria, Aquaterraria, and Aquaria. Buffalo, NY: Firefly Books Ltd., 2007.
  2. Buruchovitz, David E. Mini-Aquariums: A Guide to Successful Nano Aquariums. Neptune City, NJ: TFH Publications, 2008.
  3. Alderton, David. The Exotic Pet Survival Manual. Hauppauge, NY: Barron's Educational Series, Inc., 1997.
  4. Jes, Harald. The Terrarium. Hauppauge, NY: Barron's Educational Series, Inc., 2000.
  5. Bartlett, Patricia P., Billy Griswold, and R.D. Bartlett. Reptiles, Amphibians, and Invertebrates: An Identification and Care Guide. Hauppauge, NY: Barron's Educational Series, Inc., 2001.
  6. Bartlett, R. D. The 25 Best Reptile and Amphibian Pets. Hauppauge, NY: Barron's Educational Series, Inc., 2006.
  7. http://www.paludarium.net
  8. http://www.aquariacentral.com/forums/showthread.php?t=183835
  9. http://www.aquariacentral.com/forums/showthread.php?t=221495
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