now I will introduce you one of the most beautiful Wild Betta which I know and he is one of the Betta, who is a very difficult form and expansive. There a lot of locations in Asia where you can find him, even in different colours. The most rare form come from Brunei.
The fish is protected by the Sultan of Brunei, who likes the fish. It's prohibited to be in possession, to try to catch, or to keep the fish in a tank in Brunei. Please remember that they still have corporate punishment in that country, so do NOT try to smuggle the fish out of Brunei.
See the pictures of this. I have only the male, and hope to find a female of this location in the future.
But I need a lot of money to do that.
Here you see the location form, which I catched 2008 in Malaysia. This male is F1 Generation. since I have Betta macrostoma I can spawn them only one time. But they will live longer then Betta splendens.
Care: Extremely difficult. Only specialists should try to keep the fish. Requires painfully pure and very soft water(90% RO), with a strong current, filtration over active peat. Large tanks are also advised, the fish can swim extremely fast, and have been known to kill themselves by swimming against the tank glass. Tanks should be covered extremely well, as Betta macrostoma is an excellent jumper, and is susceptible to cold air. Lot's of hideouts, especially floating plants, and very frequent large waterchanges. An UV filter is strongly recommended.
Temperature: 24-26 degrees.
Feeding: Varied live and frozen foods(krill) should be supplied. Carefull, don't use food that may be infected with diseases. In nature the animals mainly feed on live insects. Schultz(1999) described that sick foodfish, as well as red mosquitolarvae and tubifex caused Betta macrostoma to die.
Size: up to 11 cm, Schultz reports 9 cm in aquaria.
pH: 3.0-5.5
Breeding: If the fish can be kept alive, usually breeding will occur. The fish can be bred after 6 months, breeding occurs near the surface, and the female takes the initiative.
Sexual dimorphism:Males are much more colorfull.
Hope you got informations enough. When you have questions, please ask.
I am a poor old man 
but this is not the title of the topic. ;) I will go back OK. Now Betta macrostoma is very difficult to spawn, and in Germany not enough species of them. That is the reason that you must pay a lot of money to get a pair. The most expensive form is sp. Brunei. I must pay for one pair unti 250 Euro. A lot of money. The other local forms are cheaper.
