If you google male and female pearl gouami, you will clearly see the difference between the two. The male is much more colourful and his fins are longer than the female. The colours of the male will turn very dark with iridescent purple, blue and orange. The female stays more of a silver to the body and lighter orange on the anal fins. The male will get long serated looking anal fin and his dorsal fin will be longer and more pointy than the female, her fin is more rounded.