Resumen

QUERALES, David et al. Embryonic and larval development of sea bass Paralabrax dewegeri Metzelaar (Pisces: Serranidae). Rev. biol. mar. oceanogr. [online]. 2004, vol.39, n.1, pp.1-11. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572004000100001.

The embryonic and larval development of Paralabrax dewegeri are described from fertilization to metamorphosis. The gametes were obtained from spontaneous spawning. Fertilized eggs are spherical, floating, transparent, pelagic, with smooth chorion with one oil globule. The average egg diameter was 0.89 ± 0.02 mm and the average oil globule diameter was 0.19  ± 0.01 mm. The morula stage was observed 2 h after fertilization, the blastula stage at 2 h: 40 min. The gastrulation  started at 3 h: 50 min and finished at 6 h: 50 min. At 7 h: 20 min the germinal ring was observed. The neurula stage started at 7h: 50 min. The differentiation between head and embryo tail with 10 to 12 somites was observed  9 h after fertilization and  35 min later the optical and auditory capsules were observed. After 10 h: 50 min, pigmentation embryo process started. Twelve hours after fertilization  20 to 25 somites were observed, and some pigments into the oil globule which is located between the head and the tail. At  12 h: 50 min the disperse dorsolateral pigmentation spreaded out from the posterior region of the head to the caudal region.  Hatching took place 16 h :20 min after fertilization, at 27 ± 1ºC. Recently hatched larvae have an average body length of 1.44 ± 0.07 mm. About 48 h after hatching the yolk sac was reabsorbed. The notochord flexion occurred from day 12 to 15,  and the metamorphosis was completed at day 30  after hatching

Palabras clave : Reproduction; embryogenesis; fish larvae; Atlantic ocean; Venezuela.

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