Ishimura explains, “Seafood brokers are good at adapting to fluctuations in the kinds and quantities of fish and other sea life that are caught. Distributing investments among multiple assets to minimize risk while sustaining returns is a well-known financial engineering theory of portfolio management, and the same thinking applies to fishing as well. Ishimura showed that the diversification of species in each catch has contributed to the stability of the coastal fishing business. It all becomes food and avoids the negative effects of intensive fishing of a limited number of species.
In contrast, when Japanese fishers using their unique trawling and set nets catch a variety of marine species at once, none of the catch goes to waste. That is why Japan, compared with other countries, has developed a culinary culture that utilizes an extremely wide variety of marine species.” Catching many species together, rather than just targeting the one or the few with a high market value, is a method that commonly leads to a significant loss of catch in other countries because only a limited variety of seafood is ever in high demand.
ISHIMURA Gakushi, Associate Professor of resource economics at the Iwate University Faculty of Agriculture, says, “In Japan, which has four distinct seasons, and whose geography is characterized by multiple inlets where different currents run up against each other, the ocean environment of coastal fisheries and the species composition of the catch changes easily. All three men conduct research on the Sanriku Coast’s fishing industry. Professor ABE Keita (right), and KANAZAWA Kaito (left), a graduate student who comes from a Miyako fishing family and who studies under Ishimura. Professor ISHIMURA Gakushi (center), Musashi University Assoc.
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