You could use his cousin the cod too, or other fish. The crust contains cheese, so don't use oily fish, they don't go together at all.
For the crust, you could make any combination of ingredients you like in a base consisting of breadcrumb, butter and cheese.
I used equal parts breadcrumb (panko), butter, grated cheese (Comté). Mixed in a small fresh deseeded chopped chilipepper, chopped parcely, s&p. I forgot my usual lemon zeste. You could add a few drops of booze in there too, like pastis. The quantities aren't very critical, so you can play with them as well.
Now pulse everything together a few times. You could blend longer into a paste, or shorter into a crumble, or something in between like I did. Actually, I was going for a crumble, but hey, things happen.
Season the fish first, then cover each fillet with a generous layer of the crust. Put the fillets on a plate if you usually cut meat on the same board!! Transfer the fillets to a not too large oventray. Pour a few tbsp of white wine in the bottom of the tray, but make absolutely sure the crust is not touching the wine! Put in a very hot oven 200°C/400°F for 8-10 minutes or less, depending on the thickness of the fillets.
Before you do the fishprep above; cut the zucchini in thin long strips with a thin peeler. Don't use the part where the seeds are. You now have zucchini tagliatelle, or maltagliata or pappardelle.. use the name you like.
Steam the strips 2-3 minutes. Leave to cool. Heat a tbsp of olive oil and quickly warm the zucchini in it with added s&p. The zucchini has to stay "al dente".
Put the zucchini on plates. Put a bit of smoked paprika in a sieve and tap gently over the zucchini. No more than the amount of salt you would use, or it will taste all like chorizo! I use Spanish La Chinata sweet smoked paprika, it's a main component in chorizo, so again, always use sparingly!
Put the fish on top. Done.
