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The Emerald Green Betta found in the basins of the Mekong and the Chao Phraya
Betta smaragdina known as the emerald green Betta can grow to some three inches in length. Endemic to Borneo and found in the basins of the Mekong and the Chao Phraya can be housed in pairs, species tanks, and community tanks. This is an important species to keep because they are marked as vulnerable on the IUCN Red List of endangered species. Water Conditions are not critical for B. smaragdina because they are very tolerant of water chemistry. According to the International Betta Congress males are more intensely colored and might have longer fins while the females will be a browner in color however females should display an ovipositor or egg tube. Males are known to initiate spawning and entice females to the nest for spawning. Betta smaragdina is offered as the Pink Pearl Betta.