Variation des protéases,des amylases et des protéines solubles au cours du développement larvaire chezPalaemon serratus

The variations of protease and amylase activities during the larval development of the crustaceanPalaemon serratus maintained at 20°C have been investigated. Some important differences have been detected during the first larval stages. Amylase activity rapidly reaches a high level during the second larval stage (Zoea II), whereas the increase in protease activity only occurs at the fifth larval stage (IV or Mysis I). Disc electrophoresis of soluble proteins reveals important qualitative and quantitative changes. Qualitative changes occur mainly at the second larval stage and during metamorphosis. All these changes are related to modifications of the shrimp's diet.