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Identifier

000369997

Title

Τροφική οικολογία μικρών πελεγικών ψαριών

Alternative Title

Trophic ecology of small pelagic fish

Author

Νικολιουδάκης, Νικόλαος

Thesis advisor

Καρακάσης, Ιωάννης

Abstract

The main aim of the present dissertation was to study the trophic ecology of two of the most abundant small pelagic fish species in the North Aegean Sea, i.e., the European anchovy (Engraulis encrasicolus) and the European sardine (Sardina pilchardus). The North Aegean Sea is one of the most important fishing grounds for small pelagic fishes in the Mediterranean Sea, largely owed to the enhanced productivity of this area compared to the generally oligotrophic Eastern Mediterranean. Regarding the trophic ecology of the two species, the feeding periodicity, feeding intensity and daily ration was studied in fish collected during four oceanographic cruises (July 2007, December 2007, July 2008 and February 2009). The prey composition of the stomach contents was also analyzed in an attempt to define dietary preferences for each species and subsequently relate them with the structure and function of the pelagic food web. To achieve this, concurrent measurements of environmental and plankton variables (from bacteria to mesozooplankton) were also carried out in an effort to infer major trophic pathways in the pelagic food web and how these are related with prey selection in sardine and anchovy.

Language

Greek

Subject

Anchovy

Diet

Sardine

Γαύρος

Διατροφή

Σαρδέλα

Issue date

2011-11-03

Collection