In this concept of reproductive isolation I forsee a scenario where fish stocks although in the same habitat range to do not intermingle or interact reproductively because of differential recruitment patterns and size disparities between adults of the different stocks.

I also forsee a scenario where species of the same family minimize cross breeding with themselves by evolutionary behavioural patterns that isolate them from each other. Thus the high incidence of hybridization in members of the same family may be as a result of the breakdown of this isolation mechanism.

The mechanisms of reproductive isolation or hybridization barriers are a collection of mechanisms, behaviors and physiological processes that prevent the members of two different species that cross or mate from producing offspring, or which ensure that any offspring that may be produced are sterile. These barriers maintain the integrity of a species over time, reducing or directly impeding gene flow between individuals of different species, allowing the conservation of each species characteristics.