so we import from other countries, according to food journalist paul greenburg. his book "american catch" describes a seafood swap. >> we tend to export stronger-tasting things like mackerel, black cod, a lot of squid. and then we import sort of neutral-tasting things like shrimp, tilapia, very neutral-tasting things that you can deep fry and use in the american palate-friendly sandwich. >> reporter: he says aqua culture can help correct this imbalance, but -- >> rather than trying to kind of start up in a new and complicated venture, first off, let's try and keep the fish that we've already got. >> reporter: aqua culture solves more global problems than americans not liking fishy fish, according to don kent with hub seaworld. >> there's 7 billion people on effort now. there's going to be 9 billion people before -- in your lifetime. very, very soon. how are we going to feed those extra 2 billion people? >> reporter: o'mally with coast keeper has several environmental concerns. 11 million pounds of fish will create a lot of fish poop. he says that waste could hurt