The greater amberjack (Seriola dumerili) is a group spawner , and in the wild it forms large aggregates during the spawning season. In the present study, we acquired knowledge on the spontaneous spawning kinetic and parental contributions under aquaculture conditions, and after spawning induction using exogenous hormones.
Two breeding groups were formed in 75-m3 tanks . T he first group was allowed to spawn volitionally (Spontaneous ; 5 males, M, 19.0 ± 0.5 kg mean (SD) body weight; 4 females, F, 29.7 ± 0.9 kg). The second group was treated with GnRHa implants (Induced; 6 M, 22.1 ± 1.6 kg; 4 F, 25.0 ± 2.0 kg) . Spawning was monitored for 24 days and eggs were collected. Broodstock and egg genomic DNA were extracted for genotyping and parental assignment.
Financial support has been provided by the European Union’s Horizon 2020 grant agreement No 862658 , NEWTECHAQUA project.