Aquatic animals Trade with aquatic animals between countries and zones Trade in aquatic animals within Sweden and with countries within the EU and outside the EU. Bringing ornamental aquatic animals into Sweden Information about bringing ornamental aquatic animals into Sweden. Oyster diseases Bonamia ostreae, Bonamia exitiosa och Marteilia refringens Information regarding monitoring on infection with Marteilia refringens, Bonamia ostreae and Bonamia exitiosa the European oyster (Ostrea edulis).