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By admin - Posted Feb 14, 2011 10:00 PM
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LATEST ARTICLES
ARTICLE

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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ARTICLE

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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ARTICLE

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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ARTICLE

On the Giant Clams Tridacna mbalavuana and T. squamosina

By James W. Fatherree on Mar 25, 2015 at 09:00 AM

Reefkeepers all know the giant clams Tridacna crocea, T. maxima, T. squamosa, T. deresa, and T. gigas. James W. Fatherree introduces two recently described species of tridacnids, one of which is now making its way into the hobby.

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ARTICLE

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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ARTICLE

Feature Aquarium: The 335 gallon "Tall Reef" of Brad Syphus

Brad's reef aquarium is maturing beautifully, but the road to success was long and difficult. Brad's story is one of perseverance and the good people who supported him through his journey.

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ARTICLE

Coral Nutrition, Part Two: Foods for Corals

By Dana Riddle on Feb 04, 2015 at 09:00 AM

While once reefkeepers believed lighting and chemical additives were all we needed to sustain corals, coral nutrition is now recognized as vital for a thriving captive reef. Dana Riddle delves into more detail about foods for coral.

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ARTICLE

Product Review: Maxspect's Gyre System

By Dana Riddle on Jan 07, 2015 at 09:00 AM

Dana Riddle thoroughly reviews one of the most anticipated and innovative water circulation devices to enter our hobby in some time. How does the Maxspect Gyre XF150 measure up?

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ARTICLE

Aquarium Renovation Project at Toledo Zoo

By Jay Hemdal on Dec 10, 2014 at 09:00 AM

Jay Hemdal, Toledo Zoo’s Curator of Fishes and Invertebrates, grants us an inside look at their grand renovation project of the historic public aquarium. The new Toledo Zoo Aquarium will open on March 27, 2015.

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ARTICLE

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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ARTICLE

Coral Nutrition: An Introduction, Care and Feeding of Zooxanthellae

By Dana Riddle on Nov 12, 2014 at 09:00 AM

All reefkeepers know about the live-sustaining relationship between coral and their symbiotic algae. However, few of us understand how to care and feed zooxanthallae. Dana Riddle examines this topic in depth.

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ARTICLE

Proposed listing of the Percula clownfish (Amphiprion percula) under the U.S. Endangered Species Act: What it means, and what aquarists need to know (Part 2)

By Chris Jury on Oct 22, 2014 at 09:00 AM

Chris Jury concludes his two part article by exploring each of the threat factors (including additional data as well as NMFS' response) presented in the petition to list Percula clownfish under the ESA.

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ARTICLE

Proposed listing of the Percula clownfish (Amphiprion percula) under the U.S. Endangered Species Act: What it means, and what aquarists need to know (Part 1)

By Christopher Jury on Sep 24, 2014 at 10:00 AM

In part 1 of a two part series, Chris Jury of the Hawai'i Institute of Marine Biology explains in great detail what every aquarist needs to know about the proposed listing of percula clownfish under the Endangered Species Act.

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ARTICLE

A Look at a Successful 125 Gallon Mixed-Reef Aquarium

By James W. Fatherree on Sep 03, 2014 at 09:00 AM

Here's a look at my 125 gallon mixed-reef aquarium. It's not the biggest, fanciest, most colorful, high-tech reef aquarium for sure, but I'm proud of it and want to share what's in it, how it works, and how I take care of it. The details will come, but for now I want to point out that there are several things about it that could be considered unusual by many hobbyists' standards, too.

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ARTICLE

Product Review: Products for 'Rapid Cycling' of Marine Aquaria: Brightwell Aquatics' MicroBacter7 and Continuum Aquatics' BacterGen.M

By Dana Riddle on Aug 20, 2014 at 09:00 AM

Two products were tested under controlled conditions for their abilities to consume/convert carbon and nitrogen-based compounds (referred to as "cycling" by many hobbyists.) Results suggest that, at dosages recommended by the manufacturers, these products contain sufficient numbers of carbon-cycling bacteria to properly inoculate biochemical oxygen demand tests, and ammonia-oxidizing bacteria are present in numbers that can "seed" a sterile environment, and perhaps hasten the aerobic portion of the nitrogen cycle along by a few days when used as a supplement to conventional seeding via live rock, live sand, and hardy "starter" fishes. Potential problems with over-dosing are also discussed.

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