You are at a pretty good body weight, low fat fish is pretty low calorie, it's not surprising if that left you hungry. I do find that if say I eat 2000 calories that's higher in protein and lower in fat I'll be hungrier than at a more ketogenic ratio. But hungrier still if I'm just not eating enough.

And I guess that's the answer I'd give, see how much food it takes to satisfy you at some ratio, and then switch it up and see if you're less satisfied with a bit more protein. I could see it going either way, people will argue that protein is satiating, others will argue that low insulin makes for easier satiety, maybe both are true and it's a matter of finding your personal sweet-spot through a bit of experimentation?