3.5. Challenge test with A. hydrophila
After four weeks of feeding fish were challenged with A. hydrophila
and cumulative mortality was registered during one week (Fig. 6). All
five treated groups showed reduced mortality compared to the control.
Feeds containing Astragalus reduced the mortality by 5% (Astragalus
only) and 35% (Astragalus and boron). Feeds with Lonicera were
more effective. Lower mortalities were observed in groups fed with
Lonicera and boron and Lonicera only. Feed supplemented with both
herbs and boron was the most effective with the mortality of the fish
reduced by 55%. All these data are in comparison to the control group.