Vieja Coatzacoalcos 5cm

The name “Coatzacoalcos” refers to the range of species in the Coatzacoalcos River system in the Isthmus of Tehuantepec in Mexico. The fish has not been officially described. It is often confused with P. zonatus, another very beautiful blue fish, and mistakenly sold as "red-tail zonatus" due to the coloration in the caudal fin. In fact, many who think they have zonatus are likely to have one of the local variations of P. sp. “Coatzacoalcos.”