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Embryonic development of stinging catfish. (a) Fertilized egg; (b) Blastodisc formation; (c) 2-cell stage; (d) 4-cell stage; (e) 8-cell stage; (f) 16-cell stage; (g) 32-cell stage; (h) 64-cell stage; (i) Morula stage; (j) Blastula stage; (k) Gastrula stage; (l) Somatic formation; (m) Yolk plug; (n) Twisting movement; (o) Pre-hatching; (p) Newly hatched larvae.
