Full-size pic here*
If you blow up the picture, you can see the text. In the upper left corner of the left page is Datnioides quadrifasciatus (now D. polota)/silver datnoid, particularly the southeast Asian mainland population. In the upper right corner of the left page is D. undecimradiatus/ thinbar datnoid or NTT (North Thailand tiger). In the lower left corner of the left page is D. microlepis / Indonesian datnoid or IT (Indo. tiger), specifically the Sumatra population/variant. In the lower right corner of the left page is the Borneo population/variant of D. microlepis. The highest fish on the right page is intended to depict the Chao Phraya basin population of D. pulcher/widebar datnoid, also known as the Siamese tiger (ST). The fish just below it is intended to be the Mekong basin population of D. pulcher, also known as Cambodian tiger (CT). The fish in the lower left corner of the right page is D. quadrifasciatus, specifically the population from the island of New Guinea, including both the Irian Jaya (Indonesian) side and the Papua New Guinea side. The fish in the lower right corner of the right page is D. campbelli/New Guinea datnoid, aka NGT.**
From what I've seen, regardless of what the LFS calls them, we only seem to get D. microlepis here, so I'll go into a little more detail about this species.
Family: Datnioididae.
Order: Perciformes (perch-like).
Class: Actinopterygii (ray-finned fishes).
Common name: Indo Datnoid, Indo Tiger, IT, (often mis-labeled in shops here as Siamese Tiger).
Size: 18 inches/45 cm. D microlepis are slow growing and rarely seen at 18 inches/45 cm in the aquarium, although do grow to this size in the wild.
Distribution: Indonesia, plus the Kapuas basin in western Borneo and Musi basin in Sumatra.
Temperament: Can be aggressive toward others of the same species, they will usually be OK with other large fish, although this is not always the case. Not to be trusted with anything even close to small enough to swallow.
Dats are one of those fish that need to be kept singly, or a group. Three would be the bare minimum to spread the aggression and allow a pecking order to develop, more are better. Having a group of varied sizes can also help to reduce aggression as the pecking order is more clear. Mixing large dats with small dats isn't usually a problem, I've heard of a case where a 13" IT would swim around with a 1" baby IT, despite easily being able to make a snack of it! Please note I haven't actually tried this myself, and I'm not responsible if you chose to try it and find it doesn't work!!
Tank Size: Ultimatly I'd say 5'x2'x2' would be the minimum for one full-grown (or close to) fish. However, my largest IT is over 3 years old and is about 20cm, its kept in a 4'x20"x20" tank. Budget on something big in the long-run, but a group should be happy in a standard 4' for a couple of years. A suitibly large filtration system is needed because of the large quantity of high-protein waste these fish produce, and regular water changes are a must to keep the water as clean as possible.
Water: Temp 24-28C, pH between 6.5-7.0.
Feeding: Young dats can sometimes be pickey, but after being fussy and starving for a few days most will readily accept chopped shrimp/prawn. Avoid feeders as it will increase the likelyhood of the fish becoming fussy and refusing other foods. Mine get a mix of chopped shrimp, beef heart, and prepared frozen foods like cichlid and discus tucker. One of my smaller ones will take Hikari sinking carnivore pellets if he's really hungry, but his tank mates haven't followed his lead.
How do I know if I've got an Indonesian or Siamese Tiger? Look at this picture. Indonesian Tigers typically have 7 or 8 bars, including a curved bar through eye, three or four body bars (depending on location), and three tail stripes or bars. The first body bar typically extends through the operculum and crosses the ventral surface. Specimens from Sumatra generally have three body bars, all of which extend across the ventral surface, while specimens from Borneo generally have four body bars, which also cross the ventral surface. Partial bars are almost invariably absent. Some have split bars, I'll try to take a photo of mine to show this.
I'll continue to add to this as I think of more stuff, and when I have more time. Feel free to contribute, question or challenge!
Sources/credits: Map + text taken from MFK, *Pic thanks to Neoprodigy, **Text thanks to Ichthyophile. Other info from http://www.datnioides.co.uk and from my own experiences.
