Rub the herbs and ½ the salt into the catfish.
Refrigerate for 30 minutes.
Peel and dice the mango.
Mix the mango with the red onion, cilantro, lime, and the other half of the salt (this is your salsa). Note you can add minced pineapple and green pepper too if you want.
Fry in a cast-iron skillet for about 6 minutes on each side. The fish will be flaky.
Put salsa on the side when serving.