Population and Distribution Pattern of Polychaetes in and around a Sewage Outfull Region in Calcutta Metropolis

Polychaete species as well as their population density and month-wise variations in population has been studied at the Tolly's Nullah sewage outfall region, Koikata. Three {Namalycastis faiiveli, Dendronereis aeslurina and Nephtys oligobranchia) out of six species recorded were found to be dominant at the outfall area. In general, polychaete occurs in higher abundance (as high as 192 no./ m²) during premonsoon (February to April) period. They are found to prefer sandy and weedy substratum.