Hi Paula, and welcome to the Disney Parks Moms Panel! I know it can be challenging at times to keep to a Lenten diet, especially while traveling. I'll be happy to help you explore some meatless options.
While
Liberty Tree Tavern offers an a la carte menu at lunch, including Tavern Battered Fish and Chips as you mention, at dinner the menu is a set All-You-Care-to-Enjoy Thanksgiving-style Feast. The Patriots Platter includes juicy Roasted Turkey Breast and Pot Roast, as well as traditional side items. I could fill up on just the Declaration Salad, Mashed Potatoes, and Ooey Gooey Toffee Cake, but that is probably not what you had in mind. You can speak to your server about meatless options. My friend
Amy recently tried the meatless Revolutionary Meatloaf and said it was excellent. You may also be offered a vegan burger or perhaps a pasta dish, but in general items from the lunch menu are not available to order at dinner.
If you have your heart set on fish, I recommend changing your reservation time to a bit earlier. Lunch at Liberty Tree Tavern is served from 11:00 am until 2:55 pm. I just checked and found quite a few tables available for lunch on the day you plan to visit. You may also prefer to dine at a different location.
Columbia Harbour House offers quite a few fish and other meatless options on their
menu. I have had the Grilled Salmon and thought it was very good . As Columbia Harbour House is a Quick-Service location, no reservations are necessary -- just stop by whenever you are hungry.
I hope that helps! Enjoy your visit.
Anne Marie