The Jamaican Red Tilapia is in fact a hybdrid. The are not pure strain. Pure strain refers to the purity of the genetic lineage specific to the genetics of that species.Originally Posted by foodchain
The White Nile Tilapias are pure bred. They are not white because genetics from another species was introduced.
HOWEVER, in reality hybridization occurs in nature. We can draw distinctions by doing DNA tests on mitochondrial DNA and comparing other evidence at well, but selectively breeding vs. hybridization are totally different things.