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2000 - 394 p.

Main constraints in the artificial propagation of the dusky grouper Epinephelus marginatus (Lowe, 1834): Three years experimental trials on induced spawning and larval rearing

Spedicato M.T., Boglione C.

This paper reports the results of three years of experiments on induced spawning and larval rearing of the dusky grouper Epinephelus marginatus. Females were induced by hormone treatments and individuals in pre-maturation stages were artificially sex-inverted. The eggs were artificially fecundated and incubated. From the hatching day cultured microalgae were supplied. Different preys were tested: enriched rotifers (small strains) and trochophores. The larval rearing lasted 42, 13, and 51 days in 1996, 1997 and 1998, respectively. In all the individuals the mouth gape (about 95 µm) and the complete reabsorption of the yolk sac were observed around the 5th day, when the olfactory placode assumed a circular shape. A peak of mortality occurred in each experiment between the 8th and the 12th day. The very small size of larva as well as mouth gape seems to be a very important, but not the only constraint in E. marginatus larviculture.

Mots-clés    

EPINEPHELUS, LARVE, ORGANE DES SENS, REPRODUCTION

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Spedicato M.T., Boglione C. Main constraints in the artificial propagation of the dusky grouper Epinephelus marginatus (Lowe, 1834): Three years experimental trials on induced spawning and larval rearing. Recent advances in Mediterranean aquaculture finfish species diversification. Zaragoza : CIHEAM, 2000. p. 227-234. (Cahiers Options Méditerranéennes; n. 47). Seminar of the CIHEAM Network on Technology of Aquaculture in the Mediterranean on 'Recent advances in Mediterranean aquaculture finfish species diversification', 1999/05/24-28, Zaragoza (Spain). http://om.ciheam.org/om/pdf/c47/00600622.pdf