yeah, displacement of native species is an issue, especially in the southeast where Tilapia thrive. There arent any really solid answers to introduced species right now, except maybe to only allow possession of animals where they are native, which is not likely to pass in the USA.
Some ethnic traditions release live fish as pitance, and in some cases exotic wildlife is released by people so that they have a source of it locally - non-native crayfish are wiping out EVERYTHING in arizona and new mexico, they most likely got there because they make good fish bait. It's a tough call.
Most closed-system fish farms have 0% escapee rate, so that's pretty good. As long as people aren't releasing them alive (which they are) they shouldn't show up in local waters.
as for buying the fish alive, scale, eviscerate and rinse well. After that you can fall into one of two camps; leave on the bone for 48 hours or so as to work through rigormortis, or filet immediately and prepare. I actually like my fish a couple of days old, it allows the flavor to develop. I think that fish fresh out of the water is almost flavorless (in many cases). make sure to ice it well at all times, except for exposed filets. NEVER put ice on flesh.
Erik. |