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\hypersetup{pdftitle={Population Dynamics and Fisheries Management of European Hake \textit{Merluccius merluccius }in the Egyptian Mediterranean Waters},pdfauthor={Sahar Mehanna},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Age and growth, Egypt, management, Mediterranean Sea, Merluccius merluccius, stock assessment},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
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\Large{\textbf{Population Dynamics and Fisheries Management of European Hake \textit{Merluccius merluccius }in the Egyptian Mediterranean Waters\footnote{\textbf{Contact Address:} Sahar Mehanna, National Institute of Oceanography and Fisheries, Fish Population Dynamics, P.O. Box 182, Suez, Egypt, \mbox{e-mail}: \email{sahar_mehanna@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Sahar Mehanna}}
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\begin{itemize*}
\item[]{\small{\textit{National Institute of Oceanography and Fisheries, Fish Population Dynamics, Egypt}}}
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\textbf{Abstract}
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\normalsize{
The Egyptian Mediterranean coast covers a distant of nearly 1200 km long that produces an annual average of 50 thousand ton of valuable marine species. The main fishing gears operated in the area are trawling, purse"=seining and lining especially long and hand lining. European hake \textit{Merluccius merluccius }represents one of the most important fishes in the Egyptian sector of the Mediterranean. It mainly caught by trawlers and form about \mbox{4\,\%} of the total trawl catch. A total of 1920 European hake was collected from the commercial catch of the Egyptian sector of Mediterranean between July 2006 and April 2009. Total length ranged between 14 and \mbox{67\,cm} while total weight varied from 21 to 2300 g. The length"=weight relationship parameters were a = 0.0067 and b = 3.026. The age distribution based on otolith readings, covered age groups 0 to VIII. The parameters of the von Bertalanffy growth function in length were K = 0.28 year$^{-1}$, L\&\#8734; = \mbox{71.5\,cm} and t0 = -0.35 years. The rates of total (Z) and natural mortality (M) were 1.08 and 0.35 year$^{-1}$, respectively. The fishing mortality (F) was 0.73 year$^{-1}$ and exploitation rate (E) of 0.68 indicated that the population has been heavily exploited. The estimated total length at first capture (Lc) was \mbox{19.76\,cm}, while the total length at \mbox{50\,\%} maturity (Lm) was \mbox{30.95\,cm}. Yield per recruit analysis revealed over"=fished stock conditions particularly due to small fish being effectively unprotected by the current minimum size regulations, and to reach a target such as F0.1 the reduction of current F should be of about \mbox{30\,\%}.}

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\noindent \textbf{Keywords:} Age and growth, Egypt, management, Mediterranean Sea, \textit{Merluccius merluccius}, stock assessment
\index[key]{Age and growth}
\index[key]{Egypt}
\index[key]{Management}
\index[key]{Mediterranean Sea}
\index[key]{\textit{Merluccius merluccius }}
\index[key]{Stock assessment}
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