Vol. 2, Issue 6 (2017)
Influence of photoperiod on number of young ones laid down (fecundity) of freshwater snail Bellamya dissimilis
Author(s): Pallavi Jadhav, Meena Patil
Abstract: Light is the synchronizing factor as in many animals and photoperiod play an important role in reproduction. This experiment was designed to investigate the influence of photoperiod on the reproduction/fecundity (no. of young ones) of the viviparidae snail Bellamya dissimilis. Reproduction/Fecundity of the snail Bellamya were examined at four different groups i.e. long day (16L: 8D), short day (8L: 16D), medium day (12L: 12D) and control group kept in an artificial photoperiod experiment for 21 days. This result indicates that artificial photoperiod affects the frequency of young ones. Snails kept in long day laid maximum number of young ones (153 young ones/25snails/21days) and those kept in short day laid minimum number of young ones (43 young ones/25snails/21days) and snails kept in medium day and in control group laid 45 young ones and 33 young ones respectively. There was a significant difference (p˂0.01) between the long day photoperiod 16L: 8D and in control group. Mortality rate was less in long day (16%) than in short day (40%) though long day has maximum number of young ones. This study conclusively shows that long day regimes have stimulatory effects on sexual maturation. Further investigations will be put on the difference in quality between young ones laid in different seasons.
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