A geostatistical approach for the stock assessment of the edible sea urchin, Paracentrotus lividus

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• 作者：Piero Addis ; Marco Secci ; Andrea Manunza ; Stefano Corrias ; Alessio Niffoi ; Angelo Cau
• 关键词：Paracentrotus lividus ; Geostatistical method ; Stock assessment ; Sardinia ; Mediterranean Sea
• 刊名：Fisheries Research
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：100
• 期：3
• 页码：215-221
• 全文大小：536 K

文摘

Quantitative surveys of the edible sea urchin, Paracentrotus lividus, were conducted in four fishing zones of Sardinia (Southern Italy, Mediterranean Sea), in Autumn 2007. A total of 120 stations were geo-located along a bathymetric gradient ranging from 0 to 10 m. A geostatistical method was used to evaluate spatial patterns in density and to estimate harvestable stocks. Variographic analyses showed that the isotropic Gaussian and spherical models successfully explained the spatial structure of sea urchin assemblages in these areas. Density maps obtained by punctual kriging showed that sea urchin populations tend to be patchy rather than uniform in their density distribution. A combination of mapping and size categories was used to generate diverse scenarios of harvestable stocks (specimens ≥50 mm in diameter) before the start of the current fishing season. We conclude that the geostatistical approach, which takes into consideration the spatial autocorrelation structure of the populations in small areas, seems to be a good estimator of P. lividus density and biomass and for the assessment of its harvestable stocks, and thus provides an initial step towards a scientific approach to the management of local sea urchin fisheries.