A team of researchers from the Danube Research Institute and the National Agricultural Research and Innovation Centre, both in Hungary, and Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas in Spain reports that is it possible for fish eggs to survive the trip through the bird digestive tract and subsequently to hatch. In their paper published in Proceedings of the National Academy of Sciences, the group describes their experiments with birds and fish eggs and what they found.
Click here for original story, Experiment shows it is possible for fish to migrate via ingestion by birds
Source: Phys.org