Journal
AQUACULTURE
Volume 317, Issue 1-4, Pages 255-259Publisher
ELSEVIER
DOI: 10.1016/j.aquaculture.2011.04.030
Keywords
Thunnus thynnus; Bluefin tuna; GnRHa; Induced spawning; Fecundity; Disector method
Categories
Funding
- European Community [Q5RS-2002-01355]
- Spanish Ministry of Science and Innovation [CTM2007-65178-C02-01/MAR]
- Junta de Andalucia [RNM-02469]
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The effect of a delivery system (implant) loaded with gonadotropin-releasing hormone agonist (GnRHa) on the spawning performance in captive-reared Atlantic bluefin tuna (Thunnus thynnus) was assessed by means of stereological quantification of ovarian post-ovulatory follicles (POF). Among untreated control fish no follicles were observed at the oocyte maturation (OM) stage; in contrast, 10 of the 16 GnRHa-treated fish showed follicles containing migratory-nucleus oocytes and/or hydrating oocytes. Post-ovulatory follicles were observed only in three of the 14 untreated individuals examined, while all but one GnRHa-induced fish showed POF in the ovary. Nevertheless, when POF were present in the ovary, the amount of ovulated oocytes was not found to be significantly different among GnRHa-treated and untreated control fish, and wild spawners. The relative batch fecundity (eggs g(-1) of body mass) estimated from ovarian POF counts were 109.62 +/- 28.36 (control group), 68.92 +/- 13.05 (GnRHa-treated group) and 83.47 +/- 15.63 (wild group). It was concluded that treatment with GnRHa implant stimulated OM and spawning in captivity, thus enhancing the reproductive potential of the broodstocks; however, there appears to be a limitation in the number of eggs maturing in each batch, and the spawn fecundity was not increased by the hormonal treatment. (C) 2011 Elsevier B.V. All rights reserved.
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