Biometric evaluation of the freshwater snail Pila globosa (Swainson, 1822) from the river Ganga in Bihar, India

Length-frequency distribution, morphometry, length-weight relationship, relative condition factor and sex ratio of the apple snail Pila globosa (Swainson, 1822) were studied from river Ganga. A total 922 specimens collected during July 2020 to June 2021, ranging 3.53 62.99 g 16.49 59.78 mm (shell length). distribution revealed that more than 50% male female within 35 45 in length only few (1.58%) observed higher (>55 mm). Females have significantly longer shells are heavier males. Shell has strongest correlation with shell width (r=0.974) least penultimate whorl (r=0.855). Length-weight indicated species negative allometric growth (b<3). The was 1.07 for males, 1.00 females 1.01 pooled data. Sex (M:F) statistically deviated hypothetical 1:1, indicating a heterogeneous population (1:1.9, p<0.05). Keywords: Ganga River, Growth pattern, morphology, Snail