This is a phenomenal resource when you're trying to figure out which fish are both safe to eat and environmentally sustainable: www.montereybayaquarium.org/cr/cr_seafoodw
Don't ever hesitate to ASK the grocery store manager/waiter/etc. where their fish comes from! Most of the time they are more than happy to tell you how their fish is caught/farmed and where they buy it.
However, do keep in mind that not all aquacultured fish is inherently "bad" or raised using unhealthy processes. When done by responsible fish farmers, aquaculture is a critical resource to supplement the fish supply and avoid overfishing of the oceans. US aquaculture is tightly regulated and farm-raised fish in some cases are safer than their wild counterparts, particularly for apex predators (those that eat at higher levels of the food chain) because it helps eliminate the accumulation of toxins.
Edited by: SEALIONGIRL at: 11/2/2012 (09:46)