In the fourth episode of the podcast Joe interviews Professor Gabriel Acien, Professor of Chemical Engineering at the University of Almeria in the south of Spain. Together they discuss exciting developments in Algal Aquaculture as well as the applications of ecological reseach in this growing industry. The ParAqua podcast was funded by COST, the European Cooperation in Science and Technology and is a product of the ParAqua Action. If you are interested in joining the Action or just want to know more please go to www.paraqua-cost.eu . The podcast is produced by Joe Money and Serena Rasconi and the Science Communication Coordinator is Ana Gavrilović. If you have any questions or want to get in touch to discuss your research in aquatic or marine ecology please email: joemon@amu.edu.pl