Lectins are widely expressed in animals and plants, with a variety of biologicalactivity. In early embryonic development of fish, the various tissues and organs arenot fully developed, but they still have certain ability to resist pathogens that comefrom the outside world. This resistance is from its nonspecific immunity and maternalimmunity. Lectin existed in the oocyte are considered from maternal immunesubstance and is likely to play an important role in the process of embryonicdevelopent in fish. To gai...