Development of Marine Resources by Patrick Prouzet, Andr? Monaco

By Patrick Prouzet, Andr? Monaco

Marine assets and their exploitation, restoration and fiscal networks they generate are right here from the point of view now inevitable growing to be environmental constraints, coverage administration and technical innovation.

A ancient standpoint exhibits that Ocean and its adjoining seas always, allowed coastal groups to evolve to a really unstable setting via many technological changes.

The contemporary improvement of marine biotechnology , the invention of a very good pharmacopoeia in particular in reef environments , the improvement of marine renewables , are examples which convey that guy can improve via those new applied sciences estate and providers of the ocean.

But this improvement assets stressed of world switch calls for not just taking into consideration technical, but in addition social and political. this can be the cost that the research of maritime actions will investigate the sustainability and improvement of assorted fiscal sectors and coastal populations, confronted with the targets of a "blue progress" linked to a go back to the "good kingdom "of the marine setting

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The four-stroke engine, with turbo compressor, the variable step propeller (1994), the nozzle around the propeller would thus lead to an increase in the effective power of trawlers by 5–8 from the 1950s to the present day [EVO 11]. The development of the use of the diesel motor favored the development of the mechanization of winches. From the 1950s onward, the use of hydraulics brought more flexibility and security to maneuvers as well as greater traction power. With the stern trawling which started at the beginning of the 1960s and the replacement of the 15 By directly transforming inside the engine the thermal energy produced by a fuel into mechanical energy, internal combustion motoring allowed for the removal inside trawlers of the cumbersome boilers that were needed in steam propulsion.

Being strongly linked to the pulling capability of the vessel, fishing gear has followed changes in the methods of propulsion. Originally imported mainly from Italy and Spain [GOU 91], the Mediterranean trawls did not see any fundamental modifications until the introduction of divergent panels toward 1898, which increased the horizontal opening, and the introduction of the Vigneron-Dahl trawl in 1928. These innovations thus gave a determining advantage to the single-vessel trawl. After World War II, the hemp ropes used in the construction of trawls were replaced at the end of the 1950s by thinner 34 Development of Marine Resources and more resistant nylon string.

Bluefin tuna purse seining in the Mediterranean. – The tuna captured by the tuna purse seiner are transferred alive directly from the purse seine to a floating cage, which is then towed to the coastal fattening zones for the Asian raw tuna market; this technique, imported from Australia, has reanimated the Mediterranean bluefin tuna market by optimizing the effectiveness of this branch and the quality of the catches. 3. Trawl fishing Over the last two decades, the development of the Mediterranean trawling fishing was essentially conducted as a unique response to the ever-increasing demand from neighboring countries for fresh and refrigerated products.

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