Also, fish. Fish is good. I like fish.
First person to say anything about mercury gets autobann'd. Heavy Metal Toxic Fish would be a stupid name for a band, let alone a sound theory. People would have to eat fish morning, noon and night for any considerable levels to accumulate, and they'd have to be high up the fish-chain. Omega-3 is important. It improves brain function, and keeps the frowny-faces away.
People in New England reap great income from the harvest of fish, and often do so privately, without subsidy. They are known to be stalwart tax resistors, plying their wares for cash at the docks, telling Uncle Sam to kiss their salty asses, pumping lewdly from the hips in mock fornication. They actually do this, and it is to be greatly admired.
According to the dietary philosophy described in this thread, the top 3 reasons not to eat fish are: taxes, subsidies, and regulations - from your basic hobbyist fishing license to government management of commercial fishing to regulation of fish farms (or "sea kittens", as the PETA-tards lobby wants to call them). Your claims of fishermen being tax resisters in any significant qualities seem ridiculous. Ocean shores are filled with government-loving assholes with a hard-on for snitching on you for not having your boat registered, etc - that's no place to build a Galt's Gulch!
I agree that at first glance fish seems to make a whole lot more nutritional and economic sense than land-animal-based food, but some of those advantages don't stand up to scrutiny. Proximity to bodies of water raises demand for that land, and thus its cost, especially though higher taxes - you would get a far better return on your investment by investing your money into cheap land in the middle of nowhere (but with enough hydration for irrigation of course), and investing your time into improving & farming it. And even from the "stretching earth's resources to feed hundreds of billions of people" point of view, there are many other ways water resources can be used for food production: seaweed farming, floating farms, and so on.
It's just a simple fact of biology that plants, which get their nutrients directly from sources inedible to us (i.e. soil and sunlight), are far more economical sources of nutrition than animals, which must eat
far greater quantities of plants and/or other animals in order to grow. Filtering your nutrients through other animals has no benefits, and a whole list of drawbacks (some of which you asked me not to mention, so I won't).
Fish is also less healthy than plant-based foods: it's acidic, contains cholesterol (especially shellfish), etc. You get far better omega-3 and other healthy fats from plant foods - in large quantities from things like avocados, olives, nuts, and seeds (especially hemp), or in small quantities in pretty much all vegetables and grains (except the processed / "junk carbs" mentioned above).
Acidic foods are mutually-addictive: you have a little bit of fish and you start craving a cola, you have a cola and you start craving a hamburger, etc. If you quit them completely, after a while those cravings go away, and your body also gradually adjusts to not getting any acid / poison / cholesterol in your diet, which results in a far healthier cardiovascular system that only long-term alkaline vegans typically have.