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On Fisheries: From Maximum Sustained Yield to Sustainable Ecosystem Management
Around the world, communities depend on the bounty of the ocean for everything from subsistence lifestyles to the maintenance of multi-million dollar fishing enterprises. In North America, for many of us fish arrives on our plate by way of a long commodity chain ending at the local grocery store, and is a product we expect to see available daily as much as we might expect to see bread, milk, and eggs. Internationally, fish have different meanings; important culturally and economically, in some places what the ocean provides is the only available means of survival. However, the sea around us is changing, in temperature and in species composition. What species remain …show more content…
Daniel Pauly and a team of others have identified the mean trophic level of catch (where the species exists on the food web in relation to plankton) as an important indicator of ecosystem health. A higher trophic level indicates the catch is more ‘steps’ away from plankton- for example, a fish with a trophic level of two eats a species which eats plankton. Watson and Pauly explains that this indicator is more applicable than comparing global landings, which are declining at a moderate rate, as global landings do not account for illegal and unreported catches, the increase in fishing efficiency due to technology, and importantly, the changing composition of the catch due to sever depletion in stocks of large fish such as tuna and cod. Declining trophic level is an indicator of a significant structural change in food webs, and loss and degradation biodiversity, especially of stocks of larger fish. The findings are significant, indicating a severe decrease in the mean trophic level of global catch over the last half century. Watson and Pauly’s findings are summarized in Table 1, in which he contrasts global freshwater with marine fisheries and aquaculture, and shows a general …show more content…
The management of that uncertainty, in the structure and interactions of food webs, in the true size of the population of a single species, and in the extent to which regulations are being followed, is the key challenge for sustainable fish harvests today. Collapses like the North Atlantic cod are both systemic and unique, represented by open access policies and subsidy-driven over-capitalization as well as ecosystem uniqueness, respectively. Management is further confounded by the fact that fish populations do not follow the boundaries of the Exclusive Economic Zones that bound coastal waters of each nation, and regulation in International waters is extremely difficult to enforce. As a trans-boundary resource, this is an issue of global importance with an international geography. The limitations of available data and historic management paradigms have resulted in a severe decline of fish stocks and a structural change of many large marine ecosystems. The implications for global food security are not yet entirely felt, as technology has kept landings high, but current data suggests crashes like the disappearance of the North Atlantic Cod are likely to occur in many other environments. Possible change can come from an ecosystem approach to management and stronger collaboration between

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