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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
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Σαάπογλου, Χριστίνα Γ.
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Thesis advisor
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Παυλίδης, Μιχάλης
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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.
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Language |
Greek |
Subject |
Aquaculture |
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Escape |
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Fecundity |
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Spawning |
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Ιχθυοκαλλιέργειες |
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Ωοτοκία |
Issue date |
2013-03-15 |
Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/e/9/4/metadata-dlib-1362397798-722637-10306.tkl
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Views |
357 |