SYMBIOTIC PROBIOTICS IN SHRIMP. “Several animals recruit specific bacteria to their embryonic surfaces to provide protection against potential pathogens. For example, the shrimp Palaemon macrodactylus is protected from the fungus Lagenidium callinectes by 2,3-indolinedione that is produced by an Alteromonas sp. on the embryo’s surface.”
http://www.pnas.org/content/110/9/3229.full