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Identifier uch.biology.phd//1994vidalis
Title Βιολογία και δομή των πληθυσμών της μαρίδας (Spicara Smaris, L., 1759) στη θαλάσσια περιοχή της Κρήτης
Alternative Title Biology and population dynamics of the pickarel (Spicara Smaris, L., 1759) on the Cretan continental shelf
Author Βιδάλης, Κοσμάς Λ
Thesis advisor Τσιμενίδης, Νικόλαος
Abstract Pickarel is a Mediterranean, demersal protogynous hermaphrodite fish. The populations of pickarel on the Aegean sea are relatively homogeneous, according to the analysis of morphometric characters. We can discriminate two main population groups(a:N.Aegean, b:S.Aegean). From otolith and scale examination we found that male individuals live until 7 years and female until 5. We studied and we discussed the application of the several growth models and the changes in the length-weight relationship. Pickarel feeds mainly on pelagic preys during noctural hours. Reproduction takes place during April-May, on specific reproduction groups. Fecundity is 8000 eggs/female individual. Seasonality is characterising the growth, the feeding intensity and prey composition and the distribution of pickarel on specific grounds. A concise description of the biological cycle and of the movements concluded for different pickarel population groups are given.
Language Greek
Subject ΑΝΑΠΑΡΑΓΩΓΗ ΚΑΙ ΓΟΝΙΜΟΤΗΤΑ; ΔΙΑΚΡΙΣΗ ΑΠΟΘΕΜΑΤΩΝ; Διατροφή; ΗΛΙΚΙΑ ΚΑΙ ΑΝΑΠΤΥΞΗ; ΚΑΤΑΝΟΜΗ ΠΛΗΘΥΣΜΩΝ ΚΑΙ ΑΦΘΟΝΙΑ; Κύκλος ζωής; ΜΑΡΙΔΑ (SPICARA SMARIS) - CENTRACANTHIDAE
Issue date 1994-10-14
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Doctoral theses
  Type of Work--Doctoral theses
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