Yes. Again, having spent a bit of a career in this kind of field, I'm very wary of long-term predictions, given how variable Mother Nature is. It'll be interesting to see over the next decade whether your prediction of a warming trend occurs, given that in the last 15 years a global cooling was shown to have occurred in spite of all of the predictions.
In terms of the shrimp themselves, it's not overfishing then that caused the shrimp to decline. Are we fairly certain of that?