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Rhinogobius formosanus OSHIMA, 1919

June 20th, 2013 — 3:26pm

This species was previously considered to be a subspecies of R. nagoyae but has generally been accepted as distinct since 2008.

It can be told apart from other Rhinogobius spp. from Taiwan by presence of irregular, wavy, reddish brown lines on the cheek and opercle.

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Rhinogobius maculafasciatus CHEN & SHAO, 1996

June 19th, 2013 — 4:23pm

This species may not yet have appeared in the ornamental trade but it has been collected by a few individuals.

It can be told apart from related species from Taiwan by possessing 30-32 longitudinal (lateral) scales vs. 32-39 in other species, and 6-8 scale rows between the origin of the first dorsal-fin and upper pectoral-fin base vs. 9-15 in other species.

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Rhinogobius lentiginis (WU & ZHENG, 1985)

June 19th, 2013 — 3:04pm

It’s unlikely that this species has been in the aquarium hobby given its natural range and the lack of commercial fishing for the ornamental trade in that area.

Among congeners it’s most similar to R. davidi but can be told apart by presence of 8 (vs. always 9 in R. davidi) soft dorsal-fin rays, 10 (vs. 11-12) transverse scale rows, and 6-7 (vs. 8-10) scales between the first dorsal-fin origin and upper pectoral-fin base.

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Rhinogobius leavelli (HERRE, 1935)

June 18th, 2013 — 3:40pm

This species appears to exist in a number of different forms which exhibit differences in colour pattern, morphology, or both, and it’s currently unclear whether all of them are truly conspecific or not although those in the aquarium trade all appear similar to one another.

We’ve been unable to obtain a copy of the original description so it’s not currently possible to provide a detailed diagnosis either, with most recent studi…

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Rhinogobius lanyuensis CHEN, MILLER & FANG, 1998

June 17th, 2013 — 4:29pm

Presumably inhabits small rivers, tributaries and streams with substrates of gravel, rocks, boulders, and exposed bedrock which undergo seasonal variations in water flow rate, depth and turbidity.

Lanyu Island is volcanic, measures just 45 km² and has no major rivers or large settlements with a permanent human population of around 4000, although there is a large nuclear waste storage facility at its southern end.

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Rhinogobius flumineus (MIZUNO, 1960)

June 17th, 2013 — 12:31pm

In addition, there appear to exist two colour forms based on male dorsal-fin morphology and patterning; one in which the 4th ray of the first dorsal-fin is longest with a square bluish-black blotch on the anterior ⅔ of the fin, and a second in which the 2nd and 3rd rays of the first dorsal-fin are longest with the fin itself paler and lacking dark markings.

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Rhinogobius filamentosus (WU, 1939)

June 17th, 2013 — 10:57am

Very few details exist but the type locality is given as ‘Yangso, Li Kiang, Kwangsi Province, southern China’, which should correspond to an unspecified location within the Li River (Li Jiang) system in Guangxi Zhuang Autonomous Region, southern China.

The specimens in our images were collected i…

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Gymnochanda filamentosa FRASER-BRUNNER, 1955

June 15th, 2013 — 3:51pm

G. filamentosa has appeared in the ornamental trade but is evidently delicate and therefore recommended only to experienced aquarists.

It can be told apart from congeners by the following combination of characters: possession of filamentous dorsal and anal-fin rays in males; body transparent to translucent yellowish-brown colour in life; absence of a highly-extended second anal-fin spine; absence of carmine-red pigmentation in the dorsal, anal an…

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Gymnochanda verae TAN & LIM, 2011

June 15th, 2013 — 2:59pm

A densely-planted tank with floating vegetation and roots, twigs or branches and natural leaf litter would seem appropriate.

There’s no need to use natural peat, the collection of which is both unsustainable and environmentally-destructive.

Filtration should not be strong with an air-powered sponge-type unit ideal, and given it naturally inhab…

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Rhinogobius giurinus (RUTTER, 1897)

June 14th, 2013 — 11:26am

This species appears to exist in a number of different forms which exhibit differences in colour pattern, morphology, or both, and it’s currently unclear whether all of them are truly conspecific or not although to avoid confusion we list all together here.

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