Question: sorry, I meant to say what micro-organisms create anti-biotics

Sylvia Soldatou answered on 5 Mar 2019:

All microorganisms can create molecules that potentially have antibiotic activity. Sometimes though they produce these molecules in very low amounts and it’s not always easy to find them.
Also, we are only able to culture in the lab 1% of all marine microorganisms. It is very hard to create in a lab environment the exact same conditions in which those microorganisms were grown in nature. So sometimes, we are not able to grow them.