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Botia almorhae (B. lohachata) (Yo-Yo Loach). This Botia comes from Pakistan (and so it's sometimes called the "Pakistani Loach") and from India, where it inhabits still and slow-running waters all through the vast Ganges system. Almora, where it was first collected, is a market town and district in the Siwalik Hills, forested foothills of the Himalayas in the northern part of Uttar Pradesh.
These loaches are usually credited with a maximum length of about 10cm in aquaria, but I have seen wild-caught adults imported to New York that were noticeably longer than that. I think the first importations were in the mid 1990s.This species is less nocturnal than most Botia, about as bold as B. macrantha, and it likewise thrives best in a small shoal, where it forms a pecking order as Clown Loaches do. But provide Yo-Yo Loaches with enough coconut shells so they can nip from one to another, like the streaker at the 1974 Oscars. If you're a Yo-Yo Loach, it's much more interesting to evict a fellow loach from a coconut shell than to occupy an empty one. The Y-shaped arches are most clearly-defined on younger fish; my inherited loner was definitely a New York Loach, with a pattern that distinctly read "Oy-oy!" He learned that waggling fingers in front of the glass meant that blackworms were on the way, as soon as he danced on his tail. I say "his" because I hear that a mature female has a longer snout.
An American "Yoyo Loach" is an English "Reticulated Loach" and a German "Netzschmerle."
The mistaken name Botia lohachata that we first had for these fish arose when a researcher in 1912 took a juvenile B. almorhae, a fish that had first been described in 1831, and described it as a new species. For a long time we knew it under its pseudonym, and you'll still see it for sale at your LFS as "lohachata," if it's being given a scientific name at all. The correct, original name seems to have stuck, ever since it was listed as B. almorhae by A.G.K.Menon, The Fauna of India and the Adjacent Countries: Pisces, vol IV, part 2, in the Zoological Survey of India, Calcutta 1992 a volume, doubtless, on every shelf. (There's also an illustrated article by Gerhard Ott in BSSW Report (but in German), April 1998, posted at http://www.aqua.de/h.g.evers/bssw8.htm)
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