E-Locus - Institutional Repository of the University of Crete - Οντογένεση του πεπτικού συστήματος και του ματιού και συσχέτιση με την διατροφική συμπεριφορά στα είδη Μαγιάτικο (Seriola dumerili), Κρανιός (Argyrosomus regius), Συναγρίδα (Dentex dentex)

Home Οντογένεση του πεπτικού συστήματος και του ματιού και συσχέτιση με την διατροφική συμπεριφορά στα είδη Μαγιάτικο (Seriola dumerili), Κρανιός (Argyrosomus regius), Συναγρίδα (Dentex dentex)

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Identifier

000372487

Title

Οντογένεση του πεπτικού συστήματος και του ματιού και συσχέτιση με την διατροφική συμπεριφορά στα είδη Μαγιάτικο (Seriola dumerili), Κρανιός (Argyrosomus regius), Συναγρίδα (Dentex dentex)

Alternative Title

Feeding behavioure is influenced by the ontogeny of digestive system and eye in greater amberjack (Seriola dumerili), meagre (Argyrosomus regius) and common dentex (Dentex dentex)

Author

Παπαδάκης, Ιωάννης Ε.

Thesis advisor

Divanach, Pascal

Abstract

Τhe ontogeny of the digestive and the vision system was examined along with the plasticity of their related organs in three farmed species - meagre (Argyrosomus regius), greater amberjack (Seriola dumerili) and common dentex (Dentex dentex). The main objective of this study was to provide enhanced rearing protocols for a better biological and productive performance. All species were reared with mesocosm technology. The comparison of the two systems (digestive and vision) has shown that meagre has higher ontogeny rates than that of the other two species. The percentage of fat deposits on the liver, as an indicator for feeding malnutrition, had lower values for meagre, compared to these of common dentex and greater amberjack. The above statement is closely related to the feeding protocol used as well as to the ontogenetic rate of the digestive system. Considering the photopic sensitivity, common dentex presented the highest value, followed by greater amberjack and meagre. Meagre was the species with the highest scotopic sensitivity compared to the other two species. Greater amberjack and common dentex presented the highest visual acuity after the metamorphosis. Differences were also observed in food preferences, between different feeding protocols, but also among the various developmental stages, indicating a connection with the development and efficiency of both vision and digestive system. Based on the above results, it can be concluded that the feeding protocols used in greater amberjack and common dentex rearing process need to be reconsidered, while the rearing protocol for meagre is efficient enough. Further research is still missing, focusing on the abiotic factors, associated with the light conditions on the larvae rearing procedure. The results of this study can be used for the modification of the rearing practices through targeted changes in order to obtain optimum production results.

Language

Greek

Subject

Feeding

Ontogeny digestive

Πεπτικό Μάτι

Issue date

2012-02-09

Collection

School/Department--School of Sciences and Engineering--Department of Biology--Doctoral theses

Type of Work--Doctoral theses

Views

279

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