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Macrochirichthys macrochirus (VALENCIENNES, 1844)

Giant Sword Minnow

November 4th, 2014 — 8:18pm

It is thought to have been extirpated from the Chao Phraya and Mae Klong rivers, Lake Songkhla, and the entire island of Java due to a variety of anthropogenic factors, and the Mekong populations have also been drastically reduced. In particular, it is sensitive to pollution and gillnetting, and is heavily overfished.

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Luciosoma setigerum (VALENCIENNES, 1842)

Apollo Shark

November 3rd, 2014 — 3:21pm

There is a fish of unknown geographical origin which matches the majority of diagnostic features for L. setigerum with the exception that the dark lateral stripe is absent in the anterior portion of the body and is not composed of interconnected spots. It is relatively common in the aquarium trade and included here as L. cf. setigerum until a confirmed identity is established.

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Luciosoma pellegrinii POPTA, 1905

November 3rd, 2014 — 12:12am

The five species which currently comprise Luciosoma can be distinguished by elements of colour pattern. Popta described the colour pattern of L. pellegrinii as follows: body colour olive dorsally, with dark-edged scales, yellow ventrally; a lateral series of dark spots on the flank forming a midlateral band which extends onto the opercle but not the head; 4-8 blackish-brown, distinctly-separate spots on the lateral line; fins yellow; dorsal and anal fins with a blackish-brown band; anterior half of some pectoral-fin rays blackish-brown…

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Luciosoma bleekeri STEINDACHNER, 1878

November 2nd, 2014 — 10:34pm

L. bleekeri is most-easily distinguished from the congener L. setigerum, with which it is frequently confused, by absence (vs. presence) of a series of black spots on the lateral line scales.

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Lobocheilos melanotaenia (FOWLER, 1935)

November 2nd, 2014 — 7:00pm

The majority of Lobocheilos species are endemic to the Greater Sunda Islands of Borneo, Sumatra, and Java, and are uncommon in the aquarium trade, but the widespread Indochinese taxa L. melanotaenia and L. rhabdoura are available on a sporadic basis.

L. melanotaenia can be distinguished from L. rhabdoura by the following comb…

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Leptobarbus hoevenii (BLEEKER, 1851)

Mad Barb

November 2nd, 2014 — 5:17pm

Apparently native to Peninsular Malaysia plus the Greater Sunda Islands of Borneo, Sumatra, and Java. Reports of this species from the Mekong, Chao Phraya, and other rivers in Indochina refer to the congener L. rubripinna (see ‘Notes’).

Type locality is ‘Indonesia: Borneo: Kalimantan Selatan: Banjarmasin’.

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Gymnostomus siamensis (SAUVAGE, 1881)

Siamese Mud Carp

October 30th, 2014 — 3:17pm

G. siamensis can be distinguished from congeners by the following combination of characters: possession of 5½ lateral line scales; body relatively deep, depth fits 3.2-3.4 times in SL; head large and broad, width fits 5.5-6.7 times in SL; snout not or only weakly projecting; body plain silver in colour with no dark marking on caudal peduncle.

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Gymnostomus ornatapinnis (ROBERTS, 1997)

October 30th, 2014 — 11:49am

G. ornatapinnis can be distinguished from congeners by the following combination of characters: head small; snout relatively short and blunt; caudal peduncle very deep; pectoral, pelvic, and anal fins usually reddish-orange or rose-tinted; pelvic and anal fins often with white tips; barbels completely absent.

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Gymnostomus lobatus (SMITH, 1945)

October 30th, 2014 — 1:37am

G. lobatus can be distinguished from congeners by the following combination of characters: possession of 32-33 + 2-3 lateral line scales; 5½ scale rows between lateral line and base of dorsal-fin; body relatively slender, depth fits 3.7-4.0 times in SL; snout often projecting strongly; body plain silver in colour.

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Gymnostomus lineatus (SMITH, 1945)

October 30th, 2014 — 12:31am

Recorded from the middle to lower Mekong river basin in southern China (Yiunnan province), Laos, Thailand, and Cambodia, plus the Chao Phraya watershed in central Thailand.

Type locality is ‘Thailand: Lam Ton Lang, a tributary of Menam Sak [Mae Nam Pa Sak; Ban Lam Thong Lang, village northwest of Pakjong’.

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