How many fish can you keep in a shot glass?
That's a bit of a loaded question. Seemingly no fish would survive living in a shot glass. But contraire, there is one fish that can survive in only a few ounces of water. It is the Betta Splendens. Or more commonly known as the Siamese Fighting Fish. Even though you could probably keep one alive in a shot glass, I would not recommend it.
One reason Bettas do well in extreme conditions is because they have adapted to warm, shallow, oxygen starved waters in their native habitat of Thailand and Vietnam. Unlike most fish, they have a special organ which allows them to breathe air at the water’s surface. It’s known as the labyrinth organ and it gives them the ability to survive in water with nearly zero oxygen levels. Another unique trait is their propensity to viciously attack other male Bettas. During dry seasons they often end up in small water puddles with other males, and like the ancient Siamese Warriors of Thailand, they will battle to their death in order to protect their area.
Besides being Leroy Brown kind of badass, here are a few more unique characteristics that make Bettas an ideal choice for first time fish keepers. (Click on Read More below)