1. 3085 prelarvae and postlarvae of Navodon septentrionalis(Gunther), with body length 1.46-9.25mm, were collected in the Dong Hai during the years of 1972-1982. According to the observation of the development of artificially fertilized eggs the specimens were identified as Navodon septentrionalis. The morphological characteristics in the different development stages of larvae were described.2. The spawning season and spawning ground of Navodon septentrionalis in the Dong Hai were little known. Based on our...