author(s)
Chilka Saha, Soujita Pramanik, Joy Chakraborty, Saida Parveen, Gautam Aditya

abstract
The abundance and body size of the population of the invasive snail Physa acuta Draparnaud, 1805 (Gastropoda: Hygrophila: Physidae) was assessed from recently established population in Burdwan, India. On the basis of the shell length and body weight of the snails the body size variations were portrayed. The results suggest that the relative abundance of the snails in the sewage drain systems varied among the different sizes and with the months significantly (P<0.05 level) revealed through logistic regression. Correlations among the different body size variables were observed, with the shell length (x)-body weight(y) relationship being: y = 0.004x4.165 and the shell length(x) - shell weight (y) relationship being: y =0.106x2.298. Availability of the invasive snail P. acuta in the study area indicates the geographical range expansion in eastern India since its first report from Kolkata in 1995. Monitoring the freshwater habitats should be adopted to note the extent of invasion of the freshwater snail P. acuta in India.