Copepods in cultivation systems may be exposed to environmental conditions (e.g., fluctuations in temperature and pH, or pathogens) that challenge successful large scale production. It is, therefore, essential that copepod species chosen as live feed show high resistance to such conditions. While it is feasible to keep physical and chemical conditions relatively stable in indoor, intensive system, this may be less straightforward inextensive and larger, outdoor production systems. Epibiotic bacteria, protozoans, and algae may appear on copepods in both types ofsystems.