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Home Συγκριτική πρόκληση ωοτοκίας στον κρανιό (Argyrosomus regius) με χρήση πολλαπλών ενέσεων ή εμφυτευμάτων GnRHa.

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Identifier

000382343

Title

Συγκριτική πρόκληση ωοτοκίας στον κρανιό (Argyrosomus regius) με χρήση πολλαπλών ενέσεων ή εμφυτευμάτων GnRHa.

Alternative Title

Comparative induction of spawning success in meagre (Argyrosomus regius) using GnRHa injections or implants.

Author

Φατήρα, Ευφροσύνη

Author

Μυλωνάς, Κωνσταντίνος

Reviewer

Κεντούρη, Μαρουδιώ
Παυλίδης, Μιχαήλ

Abstract

Meagre (Argyrosomus regius) is a new species in the aquaculture industry and do not reproduce without external hormonal, treatment although its on growing techniques are successful. The aim of the study is the comparative induction of spawning success using GnRHa injections or implants and monitoring of egg quality. Four females and four males mean weight (± SEM) 7,300 ± 682 g and 6,760 ± 627 g, respectively were used from 2005 broodstock in the Hellenic Center of Marine Research (H.C.M.R). Two females were injected (n=5) and other two were implanted (n=3) with GnRHa hormone, and all the males were implanted (n=3) during the period April - June 2012. The spawning kinetics differed between the two treatments. Treatment with GnRHa injections demonstrated a repeatable pattern of small numbered spawnings in contrast to GnRHa implants treatment than the spawning pattern was not repeatable between the administrations. In addition, GnRHa injections demonstrated higher values of relative fecundity and fertilization success in contrast to those from treatment with implants. There was significant difference between treatment groups in female testosterone (T) but there was not in female Estradiol (E₂). In males, there was no significant difference between treatment groups as far as Τ and 11-Ketotestosterone (11-ΚΤ) concerns. In addition, there was no significant difference between treatment groups in 24h egg survival rate, hatching rate and 5 d survival rate. The present study demonstrates that spawning on schedule using multiple GnRHa injections, is a big advantage in the aquaculture industry as it is easier to predict the larva rearing activities. In addition, the present study provided a morphological description of oocytes after treatment with GnRHa, as a useful tool in artificial insemination technique.

Language

Greek

Subject

Aquaculture

Υδατοκαλλιέργειες

Issue date

2014-03-28

Collection

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

Type of Work--Post-graduate theses

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