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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 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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Butis amboinensis (BLEEKER, 1853)

Olive Flathead Gudgeon

September 26th, 2012 — 2:04pm

This species is not traded for aquaria but is occasionally exported as bycatch among shipments of other species. It differs from congeners in that the outermost row of teeth are not enlarged plus the interorbital space and cheek below eye are not scaled.

Butis spp. are largely nocturnal ambush predators with cryptic…

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Stiphodon alcedo MAEDA, MUKAI & TACHIHARA, 2011

September 20th, 2012 — 1:06pm

Known only from the Ryukyu Islands, Japan, and thus far recorded from just 4 streams on Okinawa island and two on Iriomote island. The type series derived from both islands with Okinawa given as type locality.

It may be more widely-distributed than this however, and was possibly transported to the Ryukyu Islands via the Kuroshio Current, an ocean current similar to the Gulf Stream transporting warm, tropical water northward from an area east of Taiwan past Japan towards the polar region.

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Sicyopus zosterophorus (BLEEKER, 1856)

September 18th, 2012 — 12:29pm

Type locality is given as ‘Boleling, northern Bali, Indonesia’ which appears to correspond to modern-day Buleleng, but this species is currently understood to have a patchy but wide distribution with a range stretching westwards from the Marquesas Islands (French Polynesia), throughout much of Vanuatu, New Caledonia, the Solomon Islands, Papua New Guinea, Palau, Fiji, Indonesia, the Philippines, Japan, Taiwan, and most recently, southern mainland China…

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Oryzias latipes (TEMMINCK & SCHLEGEL, 1846)


March 13th, 2012 — 1:26pm

Commonly known as ‘Japanese rice fish’ or simply ‘rice fish’, O. latipes is well-known to science having been widely used as a model organism in genomic and experimental biology for well over a century and was the first vertebrate animal to mate in space during the mid-1990s.

It’s also been a popular aquarium fish for many years, though is less widely-available than it once was, with the ornamental ‘gold’ vari…

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Stiphodon atropurpureus (HERRE, 1927)

Blue Neon Goby

March 13th, 2012 — 1:25pm

This species is available occasionally, though not always under the correct name. We've seen it on sale as S. elegans on numerous occasions, for example, and other trade names include 'Sumatran blue neon goby' (it's not found on Sumatra), 'cobalt blue goby' and 'freshwater neon goby'. Further…

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Stiphodon percnopterygionus WATSON & CHEN, 1998

March 13th, 2012 — 1:24pm

This species is rare in the aquarium trade and normally expensive when available. It's one of the most easily-identifiable in the genus by the combination of usually 14 pectoral-fin rays, 10 segmented second dorsal-fin rays, relatively small adult size, unique colouration in males and the shape of the first dorsal-fin in males in which the fourth and fifth spines are…

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Niwaëlla delicata (NIWA, 1937)

Ajime Loach

March 13th, 2012 — 1:24pm

During winter months N. delicata retreats to streams or underflows where it remains dormant between October and April (Kano, 2000) before emerging to spawn. Other species living alongside it in nature include Rhinogobius flumineus, Cottus pollux and Phoxinus spp.

Niwaëlla is closely related to Cobitis and N. delicata, also the type species, was described as C. delicata (Niwa, 1937). The combination of characters used to tell it…

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Butis butis (HAMILTON, 1822)

Crazy Fish

March 13th, 2012 — 1:21pm

Butis spp. are largely nocturnal ambush predators with cryptic patterning to help them blend in with their surroundings. They can also lighten and darken their body colouration to an extent, have a habit of aligning themselves with solid surfaces whether horizontal, vertical, or inverted, and often swim in an upside-down position.

The genus is usually included in the family Eleotridae of which members are often referred to…

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