Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/42185
Title: High-quality spontaneous spawning in greater amberjack (Seriola dumerili, Risso 1810) and its comparison with GnRHa implants or injections
Authors: Sarih, Samira
Djellata, Adnane
La Barbera, Antonino
Fernández-Palacios Vallejo, Hipólito 
Roo, Javier 
Izquierdo, Marisol 
Fernández-Palacios, Hipólito 
UNESCO Clasification: 310502 Piscicultura
Keywords: Egg quality
Gonadotrophin‐releasing hormone synthetic analogue
Induction
Seriola dumerili
Spawning
Issue Date: 2018
Publisher: 1355-557X
Journal: Aquaculture Research 
Abstract: Production of sufficient high-quality eggs of greater amberjack (Seriola dumerili) still constitutes the main bottleneck for commercial production of this species. The main objective of this study was to compare the quality of spontaneous spawn of greater amberjack with those obtained by either GnRHa injection or GnRHa implant protocols. Captive amberjack broodstock were distributed in three circular tanks of 40 m3. Broodstock from Tank 1 were not hormonally induced and spawned spontaneously, whereas those of Tank 2 were intramuscularly injected with GnRHa (20 µg/kg body weight) and those of Tank 3 were given EV-500 µg GnRHa implants. The number of eggs per spawn obtained in the broodstock without hormonal treatment was larger than in those obtained with injections or implants. Egg quality was best in broodstock with spontaneous spawn, followed by GnRHa-injected fish and then GnRHa implants. Besides, size of larvae from control and injected broodstock was similar between them and significantly higher (p < 0.01) than those from GnRHa implant spawn. Overall, this study showed that it is possible to obtain very high-quality spontaneous spawn in greater amberjack, providing the adequate conditions. Furthermore, GnRHa weekly injections lead to similar egg viability and hatching rates than spontaneous spawn and higher fertilization rates than GnRHa hormonal implants, which is better than in previous studies.
URI: http://hdl.handle.net/10553/42185
ISSN: 1355-557X
DOI: 10.1111/are.13808
Source: Aquaculture Research[ISSN 1355-557X],v. 49, p. 3442-3450
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