NEW YORK ( TheStreet) -- Exchange-traded fund investors have recently been given a path, if they want it, to a previously difficult to access -- but potentially very important investment theme -- with the Global X Fishing Industry ETF ( FISN). A more accurate name might be Fishing Industry and Aquaculture, as the fund targets all things related to fishing which plays into the idea of an emerging middle class in countries where there has previously been no middle class, and healthier diets that go with newfound prosperity. The theme is quite narrow in terms of number of publicly traded companies, so the fund is concentrated with only 20 names. The country makeup is probably unlike any other fund that exists with 35% in Norway, 22% in Japan, 13% in Chile, 9% in South Korea along with a few other smaller countries. Most of the names will be unfamiliar to investors who have not previously considered investing in the theme. The fund has four relatively large holdings weighted at 8% to 12% of the fund. The largest holding is Cermaq from Norway followed by Toyo Suisan Kaisha, Marine Harvest from Norway and Pesquera Camanchaca from Chile. The exposure to Japan would seem to be a worry, especially the 10% to Toyo Suisan Kaisha, until you look at what that company does and how it has fared in the face of the Sendai earthquake in March. The company purchases, processes and sells seafood, so the lack of fish farming in the business has insulated from what could have been a much larger slide. In the face of the earthquake it only dropped 7.5% and has since made it back and then some. Nippon Suisan Kaisha and Maruha Group are both more directly exposed and their share prices already reflect the risk as they are down 16% and 22% respectively but they are smaller holdings in the fund at closer to 5%. ETFTrends.com reported that "in 2008, CNN reported the fishing industry employed 200 million across the globe and generated $80 billion in revenue. China's fish consumption has grown at an average growth rate of 5.7% per year, since 1961." It also noted that "in 2030, the industry will need an additional 27 million tons of production to maintain current levels of consumption."