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Identifier 000378672
Title Αναπαραγωγική ωρίμανση και αναστροφή του φύλου στην τσιπούρα ( Sparus aurata) σε βιομηχανικές συνθήκες παραγωγής (ιχθυοκλωβούς)
Alternative Title Reproductive maturation and sex reversal of sea bream in commercial farms (sea cages),
Author Σαάπογλου, Χριστίνα Γ.
Thesis advisor Παυλίδης, Μιχάλης
Abstract During the last decade, farming of species that may reproduce within marine sea – cages fish farms has become more common. However, knowledge of the extent and ecological effects of reproduction of farmed fish within commercial farms is sparse. We examined whether large-sized gilthead sea bream (Sparus aurata) reared in farms in Greece produced fertilized eggs that survived and dispersed into surrounding waters. Extensive histological investigation of gonads sampled from five different farms revealed that female sea bream cultivated beyond the size of sex reversal matured, ovulated and released eggs during the normal spawning period of the species. Annual fecundities (108,000±60,081 eggs per kg-1 of female in farms) were low relative to commercial broodstock (> 2.0×10-6 αυγά kg-1) and decreased considerably with sex ratio (i.e. with fish size in the cage). Our findings imply that the escape of eggs from sea bream farms may have ecological consequences, which likely depend on the sex ratio and intensity of farming within specific regions. To avoid potentially negative ecological and genetic consequences of escape through spawning, farms should not be placed close to the nursery grounds of sea bream, such as coastal lagoons.
Language Greek
Subject Aquaculture
Issue date 2013-03-15
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
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