The Pescetarianism Diet
The Merriam-Webster dictionary defines this as "One whose diet includes fish by no other meat" a term that was coined in 1993 and one which makes for allowances on all seafood based items. It is consistent to vegetarian diet and an individual will still consume mainly fruits, nuts, beans vegetable and dairy, with of course the added exception of fish.
The more common choices for this diet is often down to health, because fish contains naturally occurring omega-3 fatty acids as well as having many other health benefits, add to that the vast production and variety, with studies showing vegetarians who add fish into their diet are 34% less likely to suffer from ischemic heart diseases.
You will find higher populations of pescetarians along coastal regions, Asia and Caribbean islands. A more common diet that will incorporate the daily use of fish while still being primarily vegetarian is the Mediterranean Diet.
Like with any sub-culture of the vegetarian diet, there is constant ethical debate over if it should be considered in the same category. The Vegetarian Society, which has been in place as early as 1847 will no classify these variations of diet as vegetarian. This includes any variety of "vegetarianism" that actively includes meat into the diet, even if it is only one specific meat. However dictionary definition may vary on what it will class as vegetarian.
Pescestarianisms are not without their flaws either, raised concerns over the consumption of fish with harmful toxins or heavy metal (such as mercury) are ongoing, especially in Asian countries that serve a huge variety of seafood in their diet. With restaurants supplying more and more to the demand, the variety of fish in the average diet is expanding. This has also brought about the growing concern of fish population. Farming and the mass consumption of species with fewer numbers is becoming more common in areas that use fish as the primary meat source, there are still wildlife conservationists that are conducting ongoing research into the decline of certain species of fish and if the rate of consumption is too great for the species to bare.