The photo is not that clear, but I agree with Nick that this is probably Botia almorhae. There is much confusion over these fish and to make it even more confusing, individual fish within the same species can have body markings that vary quite considerably from fish to fish, and as the fish matures the pattern fills in to be more reticulated. There is also confusion over the species themselves; I'll summarize this just to show why "naming" a fish can be so tricky.
This commonly-available loach may be seen under several common names including Reticulated loach, Lohachata Botia, Pakistani Loach, Almorha Loach, but Yo Yo Loach is probably now the most common. This name was coined by Ken Childs of Dolphin International fish importers in Los Angeles, and comes from the pattern on the fish's side resembling a series of brown "Y" and white "O" markings which is more discernible in young fish. The name "Pakistani" loach may be the most inaccurate, since this species is not known to occur in Pakistan [see additional comments below].
The exact species name of this fish is still uncertain. Originally it was deemed to be Botia lohachata, the name assigned by B.L. Chaudhuri in 1912, and it is still widely seen under this name. The genus name Botia is derived from an Asian word for soldier or warrior--a clue to the fish's temperament. [As Nick mentioned, this fish must have a group, five minimum, in sufficient tank space, so it can function normally.] In the early 1990's it was suggested that this species epithet was a synonym for Botia almorhae, the true species, which had been described in 1831 by J.E. Gray. Dr. Maurice Kottelat (2004), an acknowledged authority on this family, assigned the name B. lohachata as a synonym of B. almorhae and not a distinct species in his major revision of the genus which he separated into seven genera.
Steven Grant (2007) has proposed that B. almorhae may in fact consist of five distinct but closely-related species:
Botia almorhae Gray, 1831
Botia birdi Chaudhuri, 1909
Botia lohachata Chaudhuri 1912
Botia sp. "Kosi", possibly a variant of B. almorhae
Botia sp. "Teesta", possibly a variant of B. almorhae
The striking similarity in pattern among these fish certainly makes this feasible; the California Academy of Sciences--Ichthyology has accepted the validity of the first three distinct species. The authors of Loaches Online accept B. almorhae as the species of the subject fish. The occurrence in Pakistan is restricted to the species B. birdi described by Chaudhuri in 1909.
With all these fish being so closely patterned, you can see why naming individuals is so difficult.
Byron.