Ecoparasite control, with appropriate concentrations of carbaryl, malathion, or pyrethrin dusts, is permissible if the agent is applied externally to both test and control animals not less than seven days prior to the start of the test.
Source: wiktionary
They are also making inroads where animal safety is a primary concern, for example, for ecoparasite control on companion animals (dogs and cats), and for fly control in dairy and poultry operations.
Source: wiktionary
Only one commercial parasite vaccine is available against an ecoparasite for sea lice.
Source: wiktionary