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By Lea P. Mertens

Organic oceanography issues the biology and ecology of oceanic, marine, coastal and estuarine organisms. those diversity from viruses and micro organism to microbes and phytoplankton, from zooplankton and benthic invertebrates to shellfish, fish and marine mammals. The organisms dwell in a dynamic fluid simply defined as a chemical soup that covers seventy one percentage of the earth's floor and is in detail coupled to the ambience, the seafloor and the land. therefore, to figure out how organisms are encouraged via their atmosphere, organic oceanographers needs to functionality throughout many sub-disciplines akin to biochemistry, genetics, body structure, behaviour, inhabitants dynamics and group ecology. they need to be a professional of ocean physics, chemistry, geology, and atmospheric and radioactive techniques. This publication provides the most recent learn during this box from around the globe.

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In this way, scientists have applied the methods developed for tropical fisheries, not only due to the scarcity of suitable data, but also because of the complexity of the multispecies artisanal fisheries (Lleonart and Maynou, 2003). According to these authors, who reviewed the fish stock assessments in the MED, the first approach was the application of production models under equilibrium conditions, a method not particularly useful because of the difficulties in effort estimation (Lleonart, 1993).

The bottom trawl fishery is developed on the continental shelf and upper slope down to approximately 800 m. Some of the units (small vessels) operate almost exclusively on the continental shelf (targeting red mullets Mullus surmuletus and M. g. market prices). , 2006). ) Table 2. 4 GSA1: between strait of Gibraltar and Cape of Gata, GSA5: Baleric Islands; GSA6S: between Cape of Gata and Cape San Antonio, and GSA6N: between Cape San Antonio and Cape of Creus Research Trends on Demersal Fisheries Oceanography in the Mediterranean 19 Table 3.

Given that even a resumed and representative list of the available studies dealing with the biology of other species, neither with nor without commercial importance, would be out the 34 Joan Moranta, Antoni Quetglas, Enric Massutí, et al. aims of the present work, the following are only some examples of papers published during the last years. , 2006). , 2001; Katsanevakis and Verriopoulos, 2006). g. , 2004; Labropoulou and Papaconstantinou, 2004). , 2004b). , 2003). , 2004). However, other factors such as light intensity and bottom type can also influence the spatial distribution of demersal species.

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