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Identifier

000376376

Title

Μελέτη της συμπεριφοράς διαφυγής του λαβρακιού Dicentrarchus labrax σε συνθήκες εκτροφής

Alternative Title

Study of escape behavior of dicentrarchus labrax in reading conditions

Author

Πετρούτσος, Σπυρίδων- Ιάσων

Thesis advisor

Κεντούρη, Μαρουδιώ

Reviewer

Καρακάσης, Ιωάννης
Divanach, Pascal

Abstract

European sea bass (Dicentrarchus labrax), a mainly farmed species in the Mediterranean aquaculture has been sporadically reported to escape from sea cage facilities. However, this specific behavior has been occasionally documented. Fish escapes raise a number of concerns due to potential impact with the wild stocks through interbreeding, competition for food and mate as well as transfer of pathogens. The present study aims at the examination and monitor of sea bass escape behavior along with the investigation of the influence that a presence/absence of a visible obstacle could have of sea bass propensity to escape. Fish were initially confined into handmade sea cages, placed into a 30m³ tank. A tear was created at one side of the cages, allowing fish crossings. Fish activity was monitored by a computer vision system that developed for this purposes. From the result obtained, it is clearly demonstrated that sea bass is able to escape right after a tear appeared on the net surface. However, the presence of an obstacle close to the point of escape significantly reduced the escape rate of this species. Additionally, learning behavior and social interactions of sea bass were close related to the food provided at the specific time period. It is highly recommended on the aquaculturists to reconsider the orientation and location of sea bass culture facilities. Furthermore, the use of an extra net pen around the cage facilities as well as the presence of natural/artificial obstacle close the area of the cages could be considered as an efficient tool to mitigate the escape risk of farmed sea bass.

Language

Greek

Subject

Aquaculture

European sea boss

Ιχθυοκαλλιέργεια

Issue date

2012

Collection

School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses

Type of Work--Post-graduate theses

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