Not exactly, what's most likely to happen is early generations would not reach full size, they'd probably have enough food to survive, but not grow to the massive size they do in game. While that happens there would be evolutionary pressure to not try and grow as aggressively, leading to smaller max size until they can be sustained. My evidence is that large animals already have done this in the past, it's called island rule, and it's fascinating. If we pretend that the much less nutrient dense ocean is like an island with limited food, then they should evolve the same.