Hormonal spawning induction and larval rearing of meagre, Argyrosomus regius (Pisces: Sciaenidae)

The aim of the present study was to evaluate the culture potential of meagre, Argyrosomus regius (Asso, 1801). Trials were conducted in two different facilities in Spain, the LIMIA research centre (Mallorca) and the IFAPA research centre “El Toruno” (El Puerto de Santa Maria). In May 2006, males with free milt and females with vitellogenic oocytes bigger than 500 μm were injected with salmon gonadotropin releasing hormone analogues (sGnRHa). Spawning occurred approximately 38 hours after induction. Fecundity was high with 1.207.000 eggs collected from a 13 kg female at LIMIA in a single spawn. The larval development, growth and morphological changes were described from 0 to 30 days post hatching (DPH). The mean length of the newly hatched larvae ranged from 2.20 ± 0.02 mm (LIMIA) to 3.19 ±0.09 mm (IFAPA). Feeding began on 3 DPH, initial swim bladder inflation was observed on 5 DPH, and metamorphosis was completed on 30 DPH. Growth was very fast and the post-larvae reached 15.11 ± 3.49 mm (LIMIA) and 11.66 ± 0.96 mm (IFAPA) in 30 days Cannibalism was observed from 15 DPH onwards. These preliminary results indicate the meagre as a priority species for the diversification in aquaculture.

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