Cut the fennel and carrot into slices. Put in a saucepan and bring to the boil with orange juice and a little salt and pepper and simmer for about 2 minutes.
In the meantime, clean the catfish and pat dry. Mix the butter with the bread cubes, breadcrumbs, dried tomatoes, garlic, herbs, lemon zest and a little salt and pepper in a bowl. Distribute the mixture evenly over the fish fillets.
Pour the fennel, carrot and orange vegetables into a baking dish and place the coated fish fillets on top.
Bake at 200 ° C for about 15 minutes or until the fish is done.
Shortly before the end, gratinate for 2 minutes at 230 ° C top heat if the crust is not yet crispy.