title: Annual fish oogenesis. I. Differentiation of the mature oocyte and formation of the primary envelope.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D005260:Female; D005399:Fishes / Q000196:embryology*; D009865:Oocytes / Q000166:cytology* / Q000648:ultrastructure; D009866:Oogenesis; D010063:Ovum / Q000166:cytology*