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Identifier 000351216
Title Βελτιστοποίηση της εκτίμησης του ιχθυοαποθέματος της σαρδέλας (Sardina pilchardus) στην περιοχή του Βορείου Αιγαίου και του Ιονίου Πελάγους
Alternative Title Improvement of the european sardine stock assessment in Northern Aegean and Ionian sea
Author Αντωνακάκης, Κωνσταντίνος
Thesis advisor Παυλίδης, Μιχάλης
Abstract The main objective of the present study was the European sardine (Sardina pilchardus) stock assessment in Northern Aegean and Ionian Sea. For this purpose, sardine landings data from both regions, that have been collected in the framework of several past European and National projects (2000 to 2003) as well as data that were collected in the framework of the “Greek National Program of Fisheries Data Collection” from 2003 up to 2008 were compiled and analysed. The models of “Integrated Catch at Age Analysis” (ICA) and “Extended Survivors Analysis” (XSA), that are stock assessment models based on “Virtual Population Analysis” (VPA) method, were applied to the landings data. The XSA model was applied both to Northern Aegean and Ionian Sea while the ICA model was applied to Northern Aegean Sea only. Acoustic surveys data from Northern Aegean Sea, that were collected in June 2003-2008 and used as relative indices of stock abundance, and CPUE from Ionian Sea were used for tuning the VPA. The stock assessment model of sardine in Northern Aegean and Ionian Sea was based on the improvement of the estimation of sardine age composition. Specifically, the otoliths (sagittae) from 8205 sardine specimens, that were collected from landings and surveys data in Northern Aegean and Ionian Sea during the period 2003-2008, were used for the determination of sardine age composition. The ICA and XSA models indicated that the sardine stock in Northern Aegean and Ionian Sea is fully exploited with signs of recovery in the last years regarding stock spawning biomass (SSB) and recruitment. However, the results of this assessment should be considered as preliminary taking into consideration the short time series available as well as the lack of data in 2007.
Physical description
94 σ. : εικ. ; 30 εκ.
Language Greek
Subject Determenation of age
Natural mortality
Προσδιορισμός ηλικίας
Φυσική θνησιμότητα
Issue date 2009-11-20
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
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