There's another country too, Honduras! But these aren't exact locations but rather countries of origin. At each location caught there could be slight differences. I think when they refer to the Nicaraguan dovii they are referring to the recent imports from lake Nicaragua. I've been told that the fish from the rivers are a bit more streamline and lighter in color and are also referred as Nicaraguan dovii. So now we have 2 different locations that have probably been crossed together to give us a slightly different looking dovii. This has probably happened with dovii from Costa Rica as well. This is why killifish keepers are so anal about location information and that every species sold has a location with it. If location is not known or lost then it is sold as an "aquarium strain". Im sure there are people breeding nics to Costa Ricans not knowing and I'm sure the offspring are great looking they are just not pure. I'd love to see some imput on this thread from the experts or anyone who has collected in Costa Rica or Nicaragua. I'm friends with the curator at the Toronto zoo who has led many fish collecting expeditions in Costa Rica, I will ask him for some imput. Btw, have you guys ever heard of the elusive red dovii ;-)