I don’t have Alpha-gal (thank goodness)! Red meat doesn’t bother me at all.
Fish is problematic for me because if you look at origins, other than wild caught Alaska salmon, most are pond raised & the ponds aren’t that clean. I don’t eat Atlantic salmon because that’s usually warm water farmed salmon.
The BEST white fish, & I love it, is catfish, caught off the dock at our lake place. The lake is huge & very clean, used as a water source for several cities. The catfish range from 3 - 20*lbs, with most 5 - 10. Catch a couple of those, filet them out & deep fry catfish ‘chunks’ ... so good! Hush puppies to go along with the catfish is outstanding. My brother has started freezing a couple of pounds of raw fish for me since I don’t make it to the lake very often these days.
* There are much bigger catfish in the lake. The record was caught in 2020 & the fish weighed 121 pounds, 9 ounces, measured 60.5 inches in length, and had a girth of 40.5 inches. People post 60 - 80 lb. cats fairly frequently.
Catfish out of good water can be very good! The best I ever had were a couple blue cats and a flathead out of the middle Buffalo River, in Arkansas. All were in the 3-5 lb. range.
Also, a few years back, Devils Kitchen Lake in Southern IL was stocked with a few “extra” channel cats that IDNR came up with. That’s a very clean, clear lake too, tho’ mercury levels are a bit high due to natural sources. So, there, I’d definitely limit myself to fish not over 5 lbs. But, back when they were more like 2 lbs. I managed to catch a couple. Good eating!
Catfish out of more fertile waters, even if low pollution, can get a bit muddy tasting, but marinating in club soda or 7-Up (imparts a bit of a sweet taste) will take that out.