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By admin - Posted Oct 26, 2009 09:10 PM

A new tetra with color-coded sexing

A new tetra with color-coded sexing

Hyphessobrycon myrmex

Many tetras are difficult to sex. Often, differentiation comes down to fin lengths, subtle color deviations, or sometimes just the "fullness" of their bellies. But with Hyphessobrycon myrmex, the color between the sexes is unmistakable, and that's a good thing because this species is tiny.

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Gravity-defying suspended reef aquarium!

George Farmer filmed one of the most amazing reef setup we've ever laid eyes on. This massive reef tank was too heavy for the floors to support, so Ralph had them cantilevered from the ceiling joists!

For more information about Ralph's Reef Tank, visit his aquarium's Facebook page (aquariums this great deserve their own Facebook page!).

Subscribe to George Farmer's YouTube page for more great aquarium videos.

Baby fish as young as 8 days old can identify other fish by smell

Baby fish as young as 8 days old can identify other fish by smell

Late-stage embryos of one of the study species, Amphiprion melanopus (cinnamon clownfish). Credit: Jen Atherton

Researchers have discovered that embryonic clownfish and damselfish are able to differentiate sibling fish with the same parents from babies from different parents and also different species altogether ... all by smell!

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Two new Devario "Giant Danio" species

Two new Devario "Giant Danio" species

Devario annnataliae

Devario annnataliae and Devario udenii are two new, gorgeous species of Devario danios described from fast-moving freshwater on the island nation of Sri Lanka.

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Hawaii's Supreme Court suspends aquarium fish collection

Hawaii's Supreme Court suspends aquarium fish collection

Potter's angelfish (Centropyge potteri) on the left and Kole tang (Ctenochaetus strigosus). Photo by Dr. Dwayne Meadows, NOAA/NMFS/OPR

Hawaii's Supreme Court has put an injunction on all aquarium fish collection pending an environmental review pursuant of the Hawaii Environmental Policy Act. This effectively means the end of Hawaii fish at fish stores for the foreseeable future.

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Tropical fish can get hooked on opioids, too

Zebrafish who were exposed to hydrocodone developed fiendish drug-seeking behavior as well as withdrawal when the drug was discontinued.

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How much is GloFish worth?

How much is GloFish worth?

GloFish

Yorktown Technologies LP has sold their brand, GloFish to Spectrum Brands for approximately $50 million in cash plus incentives. GloFish are genetically engineered fluorescent "designer" tropical fish that are marketed to aquarists (where legal).

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A better understanding of sex-changing fish

A better understanding of sex-changing fish

A tale of two sexes

Sequential hermaphroditism is a fairly rare thing ... unless you're a reef fish. From clownfish and damselfish to angelfish and wrasses, a new study explores the dynamics and implications of fish that can change sexes.

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Man guilty of smuggling $1mil worth of illegal live coral

Man guilty of smuggling $1mil worth of illegal live coral

(Above) Ricordea polyps on reef substrate seized from defendant.

A Puerto Rican aquarium shop owner pled guilty of two federal Lacey Act felonies for the illicit trafficking of protected ricordea, zoanthid, and anemones over the span of three years with an estimated value of $800,000 to $1,200,000.

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How do reef fish recognize toxic prey?

How do reef fish recognize toxic prey?

Goniobranchus splendidus. Photo by Steve Clay

This gaudily colored nudibranch is toxic, and triggerfishes know it. But what markings on this nudibranch signal to fishes it is toxic? It's not what you may think. Here's a hint: Consistency matters.

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Three new crayfish species found in the Bluegrass State

Three new big, beautiful crayfish species are described from neighboring streams found in the Kentucky Appalachians. Anyone up for an Appalachian crayfish biotope aquarium?

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Goldfish can create alcohol to survive without oxygen

Goldfish can create alcohol to survive without oxygen

Goldfish are worldclass survivors ... thanks to alcohol.

Goldfish are renowned for their hardiness. New research discovers the secret behind how goldfish can survive months in frigid and oxygen-less water: goldfish possess the unique ability to convert lactic acid (which can build up to deadly levels in the absence of oxygen) into ethanol.

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Five new Grallenia reef gobies

Say hello to the five new reef goby species from the western Pacific Ocean: Grallenia compta, Grallenia dimorpha, Grallenia lauensis, Grallenia rubrilineata, and Grallenia solomonensis.

Grallenia_comparison.jpg

The five new Grallenia gobies were all discovered living on sandy bottom habitats. Prior to the formal description of these gobies, the genus Grallenia only had three recognized species.  The first species, Grallenia lipi, was described in 2007.  These gobies are hard to spot because all known Grallenia are tiny (less than 2.5cm/1 inch) and camouflage extremely well against the sandy/silty substrate.

G. rubrilineata is currently known from the Philippines, G. compta and G. dimorpha from Papua New Guinea, and G. lauensis and G. solomonensis from Fiji and the Solomon Islands.  They share similar physical traits from one another and are differentiated by minor differences in coloration, scale pattern, dorsal fin-ray count, and/or dorsal fin shape.

Grallenia_dimorpha.jpg

Grallenia dimorpha, above, exhibits the greatest sexual dimorphism of the five new species, hence its etymology.  Males (top photo) have squarish front dorsal fins with striped pigmentation running the entire length while females (bottom photo) have clear-colored fins with a triangular front dorsal.

Grallenia_rubrilineata_Trio.jpg

Pictured above is a "family" of Grallenia rubrilineata: juvenile (left), female (center), and male (right).  As can be seen, this species also has pronounced sexual dimorphism like G. dimorpha.

The new gobies are described in the Journal of the Ocean Science Foundation.

Aquatic Life Debuts its Classic RO/DI Series

What is old is new again. Aquatic Life improves the classic, time-tested reverse osmosis design. Their new Classic Series is one of the cleanest iteration of the classic RO/DI form factor we have seen.

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Should reefkeepers strive for quieter aquariums?

Should reefkeepers strive for quieter aquariums?

How does equipment noise effect our reef fish?

A clearer picture is painted with a growing body of research: noise pollution impacts the health and behavior of marine fish. Should marine aquarists pay more attention to noise levels within their aquariums?

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