Substitution is unclear. In my experience it’s very clear that scallop is served as a main course protein in contexts where the alternative is clearly fish, or most often shrimp. So insofar that substitution occurs, we’d mainly see substitution of shrimp and fish.
However, it is not clear how much substitution of meat in fact occurs at all as supply increases. People generally seem to like eating meat and meat-like stuff. I don’t know data here but meat consumption is globally on the rise.
Substitution is unclear. In my experience it’s very clear that scallop is served as a main course protein in contexts where the alternative is clearly fish, or most often shrimp. So insofar that substitution occurs, we’d mainly see substitution of shrimp and fish.
However, it is not clear how much substitution of meat in fact occurs at all as supply increases. People generally seem to like eating meat and meat-like stuff. I don’t know data here but meat consumption is globally on the rise.