Limia islai can be distinguished by almost all other Limia species by the presence of black vertical stripes across the fishes body. The only other Limia species to possess a similar striping is Limia nigrofasciata. Stripes are present on both male and female members of L. islai. The number of stripes on an individual fish can vary between 4 and 12. Limia islai have slender bodies which are olive green in colour and fish possess yellow pigment in their snout and fins.
Unlike the similarly striped L. nigrofasciatata which mates via courtship, Limia islai will sneak up on their females in order to thrust their gonopodium into them and mate. Limia islai is a livebearer, which reproduces via internal fertilization and gives birth to live young. Mated females will release between 5 and 20 fry per pregnancy.
Etymology
The wordLimia is derived from the Latin word "limus", which means mud. This refers to a Limias feeding habit of searching through mud. The word Islai however is reference to the first person to introduce the species in the aquarium hobby, Dominic Isla.