Regarding the molley<sp> fish, it probably required thousands upon thousands of
generations to evolve such a DNA parasitic trait as you described. It's
probably species specific. Besides, too much of the fish's DNA structure would
be dissimilar to the dinosaurs to even try and contemplate a possible grafting.
Not only are fish a much earlier evol. branching from lines that lead to
dinosaurs and birds, but this fish has also over 200-65 million years further
evolution. Remember, the DNA is a hugely complex strand of molecules…think of
all the naturally occuring mutations that occurred, much less selective
pressure. It's still a pipe dream and mediocre science fiction.
BTW, fish are hugely interesting in their genetic structures, mating systems,
and sexuality. Some species of fish are parthenogenetic, some species can
change their sex depending on conditions conducive to reproductive success.
Cichlid and killifish of C. America and Africa have been well studied in this
regard.
Cheers, Ethan