On the sterilization point, I may be wrong, but I though that the main goal was big GGs. If they didn't reproduce, there would be no need for a predator.

This is just an "if" of course. The cost of sterilization could certainly be prohibitive.

Now you may not like this statement (but remember, Deb, it's not you): when the suggested stocking of predators:GG is 5:1, that's a lot of revenue that will be gone if there was a sterile GG.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."