Formation and ossification of dorsal fins in larval crimson snapper. A and B, Larvae on 10 DPH show developing dorsal pterygiophores (PT); C, Larvae on 12 DPH show developing hard spine (HS) and cartilaginous of pterygiophores; D, Larvae on 13 DPH show developing sharp hooks (SH); E, Larvae on 14 DPH show first five hard spine and cartilaginous 6th spine; F, Larvae on 17 DPH show ossification of fin rays and pterygiphores.