Early development of the Peruvian rock seabass Paralabrax humeralis (Teleostei: Serranidae): morphological description of the embryonic and yolk-sac larval stages

Describe the embryonic development of Paralabrax humeralis (Peruvian rock seabass) and present morphology its eggs yolk-sac larvae using spawned by P. broodstock in captivity. The spawning occurred naturally spontaneously early November 2018. egg is pelagic round, with a diameter 0.98 ± 0.02 mm, an oil globule, 0.2 mm. Embryonic started meroblastic cleavage, reaching first cleavage stage at 0.4 h post-fertilization (HPF), reached 64 cells 2.2 HPF. Blastula period, 128 to 30% epiboly, end 11.3 Gastrula 50% epiboly 90% 19.6 In organogenesis forming Kupffer’s vesicle appeared 22.5 HPF, separation caudal fin from yolk 30.3 hatching 47.9 Water temperature was kept 17.2 0.2°C. measured 2.22 0.1 mm pigmentation pattern pinpoint melanophores, all along embryo xanthophores cephalic region, trunk, as well globule. larva takes feeds three days post-hatch-out.