can siamese fighting fish survive in cold waterIt was found that after exposed to fluoxetine, male Siamese combating fish exhibited less aggressive behaviour than is characteristic in their species. Similarly, research has found that bettas are aware of serotonin, dopamine, and GABA. There are many species in the genus Betta, most of the people of which are very morphologically similar. Within Thailand alone there are twelve nominal species with new species being found every 5–10 years. Past efforts to distinguish Betta species have been in keeping with observable morphology, but given their visible similarity, this strategy has masked much of the cryptic range in the genus. Recent speciation efforts have integrated use of DNA barcoding to distinguish species, in particular comparing the CO1 gene of the mitochondrial genome, resulting in new theories in regards to the relatedness among species and enabling for the construction of new phylogenetic trees.