Maternal transference of phenoloxidase and lysozyme activity in eggs from Penaeus vannamei

Shrimp's immune system has been extensively described and associated with environmental conditions.However, there are few reports of immune enzyme activities during ontogenetic development in shrimp larvae, the most vulnerable stage of the shrimp life cycle.Indeed, lysozyme, a crucial enzyme against bacterial pathogens, has never been described before in shrimp larvae.Hence, there are no reports of the effects of acute ammonia stress on shrimp lysozyme activity.This study aims to evaluate the lysozyme activity through all the early ontogenetic stages of P. vannamei, using the evaluation of phenoloxidase activity as a parallel indicator of immune status during the evaluated ontogeny time frame.We determined the enzymatic activity of Phenoloxidase and Bionatura