I suspect not, they sell fish at different sizes depending on...

I suspect not, they sell fish at different sizes depending on demand so in theory they could sell fish pre full size if demand was there plus they would have frozen stock ahead of sales as well to fill demand.
Of course they would have a finite supply but based on their aggressive sales expansion i would have thought they would have a substantial buffer for flexibility in case of lower growth rates due to temperatures etc.

I'm expecting a upgrade in sales forecast at some point in June.