Fish are fed to pigs in some countries. People in those countries don't seem to mind the flavor. People who visit those countries often find it highly objectionable. One solution is to feed corn for the last month or so and only feed fish in the first few months of the pigs's life.
Studies I've read say that the flavor is laid down in the last two weeks of life in the fat and that a one month final finish out time is safe. My own personal experiments show that the pigs's diet has a strong influence on the final flavor of the pork and that it takes more like two to three months to set the flavor right.
Cheers,
-Walter Jeffries
Sugar Mountain Farm
Pastured Pigs, Sheep & Kids
in the mountains of Vermont
http://SugarMtnFarm.com/