Croissance larvaire contrôlée de Penaeus japonicus Bate. Enzymes digestives et changements de régimes alimentaires

The larval and postlarval development of the shrimp Penaeus japonicus has been studied on the basis of the evolution of nucleic acids, of proteinic compounds, and of digestive enzymes. Cell multiplication was assayed by tracing the evolution of the amount of desoxyribonucleic acid (DNA) ; this multiplication was found to be high during nauplius stages. Evolution in time of ribonucleic acid (RNA) was compared with evolution of dry weight and proteins ; the amount of RNA rises considerably during stage zoe. Thus it is thought that during stages nauplius and mysis, cellular hyperplasy takes place, while cellular hypertrophy would caracterize stage zoe.