Mix garlic, salt, spices and oil in spice grinder. Cut slashes in the fish. Rub the mixture into the fish, pressing well into the slashes. Lay the fish on a plate and cover with remaining mixture. Marinate for 1 hour. Preheat oven to 375 degrees. Cut the celery into 2 inch chunks. Arrange in a single layer in a baking dish. Put the fish on the celery. Cover with tomatoes, lemon juice and parsley. Cover with foil and bake for 30 minutes. Uncover and bake for 15 more minutes.