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Growth and Mortality of the Red Shrimp Aristaeomorpha Foliacea in the Sicilian Channel (Mediterranean Sea)

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The deep water red shrimp Aristaeomorpha foliacea is an important commercial species for the trawl fisheries in the Sicilian Channel (Central Mediterranean Sea; FAO statistical area 37.5). An assessment program was recently implemented by ITPP-CNR. Two years of seasonal research trawl surveys were carried out on the Italian side of the Sicilian Channel. A time series of length-frequency distributions has been analyzed using different techniques; the results are used to estimate growth and mortality parameters of the stock. In females, two modal pulses can be discriminated for the juveniles while two-to-three "years" are visible for the adults. Female growth can well be represented by a Von Bertalanffy function: as with other species, too, there are two possible growth hypotheses, slower and faster; A. foliacea females appear to grow relatively fast anyhow. Female total annual mortality (Z) is estimated around 0.65, with a natural mortality (M) at 0.42, resulting in an exploitation rate (E) of 0.38. Male results appear similar to those of females, but the models are less well-defined and valid; male growth data are best fitted with a linear model.


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Affiliations: 1: Ist. Tecnologia Pesca e Pescato, CNR, Via Vaccara, Mazara (TP), Italy; 2: P.F. RAISA, CNR, Via Tiburtina 770, Roma, Italy, School of Fisheries, University of Washington, Seattle, WA, U.S.A.; 3: School of Fisheries, University of Washington, Seattle, WA, U.S.A.


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