Plankton sampling in the Manora Channel was repeated fourteen times during 1972 Samples were also taken beyond the Channel in September Identity of the species of Chaetognatha hauled from the Manora Channel waters is discussed, of which except two, all are new records from the Northern Arabian Sea A classification of "Maturity stages" in Chaetognatha is suggested Degree of protandry observed has been recorded Results obtained suggest a limited possibility of using Chaetognatha as indicator organisms.