You have the example of the Asian carp.
Every time I visit a land-based closed containment system, it actually isn't what we think. If you look at the trough, you will always see little fish there. You need a little male and a little female and it's done.
Another thing that was very interesting last year happened at trout farms in Scotland, I think. They could not understand why some fish were missing, because they knew exactly how many fish they had put in there, and there were some missing. Then, very early in the morning, a nature photographer understood what was going on. These trout were able to jump to one of the pipes. The guy had put grids on the troughs and everything was controlled, but the trout were very smart, and were able to jump to a little pipe and then come out.
In my opinion, you can reduce escapes, but if somebody is going to guarantee you zero escapes, I don't think that's correct.