After the defeat of the boss, the Crazed Fish Cats spawn in an even shorter interval than before.
This enemy is slightly less threatening than the other Crazed Cat enemy units, due to sporting a rather underwhelming 87K HP and only one knockback. However, it is not to be trifled with, as it comes packing the capability to perform a Critical Hit on your units, albeit a low chance, and is decently strong. In addition, it tends to be spammed, and acts as support for Super Metal Hippoe, a very potent foe on its own. Try using a combination of anti white units like Shadow Gao and knockback cats like Jamiera.