Are sea bass fillets meant to be crisp on the flesh side when fried?
If you want to avoid getting the flesh side crispy start pre-heating the oven and a frying pan, then fry it skin side down for a few minutes, turn it and fry it just briefly on the flesh side, then transfer to a baking dish and finish it for a few minutes in the oven. Keep the skin side up and place it high in the oven to ensure the skin stays crispy.