That Fish Blog – Aquarium Advice and Information
Hello, Frank Indiviglio here.
The culture of live algae and plants in brackish aquariums has not been given much attention, and few plants native to estuaries and similar environments are commercially available. However, as with fresh water tanks, live plants add a whole new dimension to aquarium-keeping, and are extremely interesting in their own right.
In brackish exhibits at the Bronx Zoo and in my own tanks, I have experimented with several varieties of algae and plants. In addition to mangroves, Java ferns and other such estuarine-adapted species, a surprising number of plants and algae that are typically thought of as either “marine” or “fresh water” can be acclimated to brackish environments. Following are a few of my favorites.
Acclimatization
Plants and algae should be introduced carefully to a brackish water aquarium…treat them as you would a fish or invertebrate. Particularly as concerns fresh-water plants, sudden changes in pH can wreck havoc with osmotic pressure, causing cell rupture and the death of the specimen.
Marine Algae
Marine algae are commonly referred to as “seaweeds”, but they are in actuality not true plants. Single or multi-celled, algae lack roots, stems and leaves, but have evolved equivalent structures. For example, holdfasts act as roots in anchoring them to the substrate, but do not absorb nutrients…that role is taken on by the leaf-like portions of the organism.
Caulerpa prolifera
This is the most commonly-available marine algae. It ranges from Florida and the Caribbean southward, and is commercially cultivated. Caulerpa spreads via rhizomes, or runners, and, although a true marine algae, it adjusts well to brackish environments.
Like all algae, Caulerpa may leak fluids when pruned, so be sure to clip only a tiny amount at a time if trimming is necessary. Related species, with rounded, pointed or fern-like shapes, are sometimes seen in the trade.
Other Types of Marine Algae
A number of other types of marine algae are sometimes available. While not as well-suited to a brackish water existence as Caulerpa, several will adjust if care is taken in the acclimatization process.
I and colleagues have had varying degrees of success with sea cactus (Udotea flabellum), Codiacea spp., mermaid’s cup (Acetabularia spp.), mermaid’s shaving brush (Penicillus capitatus) and several types of red algae.
Brackish Water Plants
Java Fern, Microsorium pteropus
To my knowledge, the Java fern is the only true brackish water aquatic plant that is regularly available to aquarists. In well-lit tanks it will proliferate rapidly. A number of fishes favor Java fern leaves as food, but its rapid growth rate can accommodate this in many cases.
Red Mangrove Seedlings, Rhizophora mangle
Mangrove seedlings, or propagules, are semi-aquatic, with the roots usually submerged and the plant itself growing above water. The red mangrove is often sold in the trade and is commercially propagated in Florida, where it also occurs naturally. Red mangroves are extremely wide-ranging, being found along coastlines in many of the world’s tropical and subtropical regions. At home in estuaries, salt marshes and along river mouths, they are adapted to fluctuating salinity levels, and fare well in brackish water aquariums.
Mangroves can be planted in mud or wedged into limestone, and, because of their semi-terrestrial nature, are best kept in aquariums housing mudskippers, fiddler crabs and other creatures that utilize both land and water areas. They excrete salt on the surface of their leaves…this should be washed away with fresh water every few days.
Mangroves often grow slowly in the aquarium, and stay at a manageable size for some time. There are a few techniques for dealing with tall plants…please write in if you would like further information.
Eelgrass, Zostera marina
Eelgrass is one of the only true plants to live an aquatic existence in marine environments. It is not commonly kept in aquariums. I have had mixed success with it, but have observed healthy stands in commercial aquariums (if you are interested in this plant, please write in and I’ll make some inquiries to public aquarium contacts).
Eelgrass populations have plummeted in the northeastern USA and elsewhere, and I encourage those with an interest to work with this plant (please note that collection is prohibited in California and elsewhere). An incredible assortment of unique fishes and invertebrates, such as pipefishes, dwarf seahorses and eelgrass-shaped amphipods, are always found in association with eelgrass beds.
I commonly observe eelgrass in estuaries, lagoons and other brackish habitats, and it thrives in true marine water as well.
Next time I’ll discuss some of the many fresh water plants that can be acclimated to brackish conditions. Please write in with your questions and comments. Thanks, until next time, Frank Indiviglio.
Brackish environments are home to many fascinating fishes and invertebrates that do well in aquariums. Please see my article on Mudskippers for a look at one of the most unusual.
The big event this weekend was a blast for everyone involved, the crowd was energized, the officials had their work cut out for them, security was on their toes, the half time show was on the big screen, the stars showed up and did their thing when the pressure was on, and I think there was some kind of football game on the next day as well.
Of course I am talking about the first TFP/NCPARS winter coral frag extravaganza (or whatever it was called) this past weekend here at TFP. Turnout for the event was great, I think we ended up with about 350 guests, as well as quite a few vendors, and some great guest speakers. I just wanted to take this opportunity to thank everyone involved, for making this a successful event. Even through the crowds, the lines, and the noise, everyone really seemed to enjoy themselves and take something out of the experience. Through the generosity of our attending manufacturers, some guests got the chance to win and take home some great raffle prizes. Frag traders had smiles on their faces, as hundreds of frags changed hands. Many people took advantage of our guest speakers, and got some great information on a wide range of topics. Special Thanks to Anthony Calfo, Steven Pro, Dave Troop, Ike Eigenbrode, and Randy Reed for speaking to the group.
This was the first event of this kind that we have hosted here at TFP, and we really were not sure what to expect heading into things on Saturday Morning. For those of you who frequent our store, you know how busy things can get in the fishroom on a “normal” Saturday, throwing a few hundred more people into things was a bit of an intimidating proposition. The great turnout was a little much for our miniscule sound system, but we’ll definitely have that remedied next time. Everyone involved showed a great deal of patience, and our staff put in the extra effort that was required to really pull things off, Great Job to all, I think we can look forward to more events of this kind in the future.
Desiree’s blog about fish nerd vacations brought back memories of a trip I’ve taken recently. In October of last year I was fortunate enough to find myself in our neighboring country to the north. On our way to Montreal to visit a friend, my girlfriend and I stopped at the Toronto Zoo that we have read so much about. We knew that it was the largest zoo registered with the AZA (Association of Zoos and Aquariums) and one of only five accredited zoos in Canada, but we still couldn’t contain our amazement once we arrived.
