Distribution and state of fishery resources in the Northern and Central Adriatic Sea using trawl surveys data

Manfredi, Chiara (2011) Distribution and state of fishery resources in the Northern and Central Adriatic Sea using trawl surveys data, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Biodiversità ed evoluzione, 21 Ciclo.
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The Ecosystem Approach to Fisheries represents the most recent research line in the international context, showing interest both towards the whole community and toward the identification and protection of all the “critical habitats” in which marine resources complete their life cycles. Using data coming from trawl surveys performed in the Northern and Central Adriatic from 1996 to 2010, this study provides the first attempt to appraise the status of the whole demersal community. It took into account not only fishery target species but also by-catch and discharge species by the use of a suite of biological indicators both at population and multi-specific level, allowing to have a global picture of the status of the demersal system. This study underlined the decline of extremely important species for the Adriatic fishery in recent years; adverse impact on catches is expected for these species in the coming years, since also minimum values of recruits recently were recorded. Both the excessive exploitation and environmental factors affected availability of resources. Moreover both distribution and nursery areas of the most important resources were pinpointed by means of geostatistical methods. The geospatial analysis also confirmed the presence of relevant recruitment areas in the North and Central Adriatic for several commercial species, as reported in the literature. The morphological and oceanographic features, the relevant rivers inflow together with the mosaic pattern of biocenoses with different food availability affected the location of the observed relevant nursery areas.

Tipologia del documento
Tesi di dottorato
Manfredi, Chiara
Dottorato di ricerca
Scuola di dottorato
Scienze biologiche, biomediche e biotecnologiche
Settore disciplinare
Settore concorsuale
Parole chiave
Adriatic Sea trawl survey demersal resources geostatistical analysis nurseries biological indicators
Data di discussione
4 Maggio 2011

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