HSB are fertile and capable of back crossing with either parent species and even themselves. So yes, male HSB do produce milt. Actual survival of young is rare though as striped bass eggs have the buoyancy of water and are not sticky, while white bass eggs are heavier than water and are sticky. HSB eggs are a cross between the two which isn't a good combination, meaning they generally sink to the bottom, stick to it and get covered in silt. This leads to the death of the embryo inside.

Each stock of striped bass from each river has distinct genetics. They have adapted to the river they spawn in so their eggs stay moving in the current and do not settle and die in the bottom silt. Many anadromous species are like this and are genetically adapted to the specific river they come back to spawn in.

HSB are illegal to stock by private individuals in Virginia because of a fear they may escape the pond they were stocked in, head down river to the Chesapeake Bay and then possibly spawn with native pure striped bass and dilute the genetics. There is evidence HSB can escape ponds and go out to the ocean, as a number of them have been caught in tidal estuaries in brackish waters that connect to full salinity ocean water. In laboratory tests, HSB can survive full salinity ocean water.