Betta fish—also known as Siamese fighting fish—are among the oldest ... Before mating, the male spends hours blowing bubbles at the water’s surface to build what’s called a mucus bubble ...

The research team studied 13 male Siamese fighting fish across five different housing conditions ranging from 1.5-liter jars to 19.3-liter aquaria, both with and without environmental enrichment ...

The research team studied 13 male Siamese fighting fish across five different housing conditions ranging from 1.5-litre jars to 19.3-litre aquaria, both with and without environmental enrichment.