Your example misses some variable. Here is a better example: regulate fishing in an area where fishing is expensive. Prices go up. More fish flock to areas wher

Your example misses some variable. Here is a better example: regulate fishing in an area where fishing is expensive. Prices go up. More fish flock to areas where fishing is done at an industrial cost-effective scale, more fish is extracted at a lower cost and re-imported, resulting in a permanent increase in extraction. It's obviously more complicated in the real world as it misses some economic and biospheric mechanics, but it gives a starting thinking exercise.