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Corals

By admin - Posted Jan 14, 2002 07:00 PM
Below is a listing of all of our articles about corals (husbandry, selection, habitats, etc) sorted by date with the newest at the top of the list.
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Feature Article: The Great Hawaiian Coral Bleaching Event of 2015: The Untold Story

By Dana Riddle on May 11, 2016 at 10:00 AM

Dana Riddle reports about Hawaii's highly publicized 2015 mass coral bleaching event, its (unreported) recovery, and the science behind these phenomenons.

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An Update on Symbiodinium Species and Their Hosts

By Dana Riddle on Feb 17, 2016 at 10:00 AM

Symbiodinium (AKA zooxanthellae) is the engine that spurs much of coral reef growth. From anatomy to clades, parasitic zoox to coral fidelity, Dana Riddle updates us on this powerhouse symbiont.

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Coral Nutrition, Part Six: Alkaline Earth and Transition Metals

By Dana Riddle on Oct 14, 2015 at 10:00 AM

Dana Riddle's sixth Coral Nutrition article examines the effect of alkaline earth (e.g. calcium and strontium) and other metals on corals – including some rather surprising information.

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Feature Article: Experimental aquaculture of Dendronephthya corals

By Tim Wijgerde, Ph.D. on Jul 22, 2015 at 09:00 AM

Back in 2005 I first read about Dendronephthya corals, notorious for being difficult to maintain in aquaria. Lacking zooxanthellae, these corals require plankton to stay healthy. In the following years, I read up on the scientific literature, and toyed with the idea of setting up an aquarium specifically designed for Dendronephthya. This led to the launch of a crowd funding project on Indiegogo, to acquire funds for the development of a culture protocol for Dendronephthya corals. Although insufficient funds were gathered to fully develop an aquaculture system and culture protocol, two preliminary experiments were conducted. In this article, I will present the results of these experiments, and provide future directions for research. This may help aquarists to keep pushing the frontier of coral husbandry and aquaculture.

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Decreased growth of Stylophora pistillata with nutrient-driven elevated zooxanthellae density is largely explained by DIC limitation

By Alwin Hylkema (ab*), Tim Wijgerde (a*), Ronald Osinga on May 13, 2015 at 10:00 AM

High nutrient concentrations are generally known to adversely affect coral calcification. This reduction in calcification rate is often associated with increased zooxanthellae densities, but little is known about the mechanism underlying calcification inhibition. In this study, we assessed the limiting effects of dissolved inorganic carbon (DIC) on growth rates of Stylophora pistillata before and after five weeks of nitrogen and phosphorus enrichment. Nutrient enrichment resulted in a significant increase in zooxanthellae density and inhibition of calcification, measured using the alkalinity anomaly technique. DIC limitation was the main causative factor for this inhibition; a doubling of the bicarbonate concentration not only restored but greatly enhanced calcification rates of colonies with elevated zooxanthellae densities. At high bicarbonate concentration, no significant negative effect of nutrient enrichment on coral growth was found. The causal mechanism behind calcification inhibition due to nutrient enrichment is most likely increased competition for dissolved inorganic carbon, either among the zooxanthellae or between the coral host and its symbiotic dinoflagellates. This highly limiting effect of DIC on coral growth at elevated nutrient concentrations has important implications for coral aquaculture and husbandry.

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Coral Nutrition, Part Three: Amino Acids and Comments on Amino Acid Supplements

By Dana Riddle on May 06, 2015 at 09:00 AM

Dana Riddle continues his intensive exploration of coral nutrition. In part three of his series, he delves deep into the subject of amino acids, including a discussion about amino acid supplements marketed to reefkeepers.

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Effects of Different Spectra Generated by LEDs on Growth of the Stony Coral Porites lobata

By Dana Riddle on Apr 15, 2015 at 09:00 AM

Stony coral nubbins (tentatively identified as Porites lobata; see Figure 1) were exposed to light of the same intensity (128 µmolm²sec) but different spectra for 75 days. Growth rates were determined by weighing the fragments periodically with an analytical balance.

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Coral Reproduction: Biology, Challenges and Future Perspectives

By Tim Wijgerde, Ph.D. on Mar 11, 2015 at 08:00 AM

Over the last decades, the husbandry of aquarium corals has risen to a high level. Although captive corals currently exhibit high survival and fast growth, sexual reproduction remains a major hurdle. Closing the life cycle of corals is an important next step in coral husbandry and aquaculture. Below, I will discuss the reproductive biology of scleractinian corals, the challenges associated with sexual reproduction, and future perspectives of coral aquaculture.

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Black Corals

By Marzia Bo, Ph.D., Tim Wijgerde, Ph.D. on Nov 19, 2014 at 09:00 AM

Black corals, formally known as Antipatharia, are members of a unique order within the Anthozoa class. These hexacorals are regularly found in the aquarium trade, and are often misidentified as gorgonians. In this article, we discuss the biology of black corals, and offer some suggestions for aquarium husbandry.

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The effect of pH, alkalinity, and calcium on hermatypic corals

By Christie D. Rajcic, B.S. on Jul 30, 2014 at 09:00 AM

Are reefkeepers striving for the right levels of pH, alkalinity, and calcium? Using PAM fluorometry, Christie D. Raji studies the effects of high and low levels of each of these parameters on hermatypic corals in a captive environment.

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On the Captive Biology of Tube Anemones

By Kenneth Wingerter on Jul 16, 2014 at 10:00 AM

When aquarist think about reef animals, cerianthids usually don't come to mind. However, tube anemones are some of the most beautiful, hardy, and long-lived organisms for captive aquariums, and they're not as dangerous to tankmates as many believe.

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Aquarium Corals: Amino Acids and Corals: Sources, Roles and Supplementation

By Tim Wijgerde, Ph.D. on Mar 12, 2014 at 09:00 AM

Amino acids are a popular ingredient in aquarium additives nowadays, with many advertised beneficial effects on corals. In this article, I will provide some basic information about amino acids, and discuss their documented roles in coral biology. This will help the aquarist to make an informed decision about using concentrated amino acid as supplements for the marine aquarium.

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Aquarium Corals: Making Corals Colorful: 'Kaede' Fluorescent Proteins

By Dana Riddle on Nov 20, 2013 at 10:00 AM

Dana delves into the the science behind coral coloration by examining the fluorescent proteins in Clade D corals including Echinophyllia, Favia, Favites, Galaxea, Lobophyllia, Montastraea, Plesiastrea, Ricordea, Scolymia, Trachyphyllia, and others.

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Aquarium Corals: Corals of the Genus Sarcophyton: The Toadstools

By James W. Fatherree on Mar 20, 2013 at 11:00 AM

Overall toadstools are attractive, hardy, and easy to propagate, making it easy to see why they are a long-time hobby favorite.

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Aquarium Corals: Feeding and oxygen affect coral growth: implications for coral aquaculture

By Tim Wijgerde on Dec 26, 2012 at 11:00 AM

It is common knowledge that many coral species depend on their symbiotic zooxanthellae to survive. Their alliance with these dinoflagellates has allowed corals to build vast underwater structures known as coral reefs, in an environment that seems almost devoid of nutrients. Research has shown that, in addition to energy gained from photosynthesis, plankton constitutes an important source of nutrients for corals. Although zooplankton supplementation may significantly enhance their growth, new findings suggest that corals are best fed when the aquarium lights are on.

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Aquarium Corals: Making Corals Colorful: New Information on Acropora species

By Dana Riddle on Dec 12, 2012 at 11:00 AM

We will look at colors of some of the most popular reef aquarium corals - Acropora species (Family Acroporidae). There is a considerable amount of relatively new information presented in this article.

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Feature Article: Epizoic flatworms impair coral feeding: evidence for parasitism

By Tim Wijgerde on Nov 07, 2012 at 10:00 AM

Flatworms are well-known in the aquarium hobby and research community. Both in the wild and in captivity, they hide between the tentacles of many corals. Despite their common appearance in aquaria, the nature of the symbiosis between corals and flatworms has long been unclear. New evidence strongly suggests that epizoic acoelomorph flatworms are parasitic. Next to suffocating coral tissue and feeding on coral mucus, flatworms have now been found to impair coral feeding.

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Aquarium Corals: Corals of the Genus Euphyllia

By James W. Fatherree, M.Sc. on Oct 03, 2012 at 11:00 AM

James describes the many species of one our hobby's most iconic and popular coral genus, Euphyllia, and discusses their merits, pitfalls, and husbandry requirements.

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Aquarium Setup: Atlantic Biotopes

By Adam Blundell M.S. on Aug 22, 2012 at 11:00 AM

Often overlooked and underappreciated, the Atlantic biotopes are amazing aquariums. Sustainable inhabitants are here in our own backyards and ready for hobbyists to create new and interesting aquariums. Much can be learned about these animals from captive systems and hobbyists have a remarkable opportunity in front of them to participate in the process and progress.

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Aquarium Invertebrates: Phestilla Nudibranchs: Cryptic Enemies of Porites, Goniopora, Tubastrea and Dendrophyllia Corals and an Identification of 'Montipora-eating Nudibranchs'

By Dana Riddle on Jun 13, 2012 at 11:00 AM

Dana takes us on an in-depth look at the Phestilla and Embletonia nudibranchs that can wreak havoc on an unsuspecting coral in your tank.

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